#!/usr/bin/env perl
# (c) 2001, Dave Jones. (the file handling bit)
# (c) 2005, Joel Schopp <jschopp@austin.ibm.com> (the ugly bit)
# (c) 2007,2008, Andy Whitcroft <apw@uk.ibm.com> (new conditions, test suite)
# (c) 2008-2010 Andy Whitcroft <apw@canonical.com>
# Licensed under the terms of the GNU GPL License version 2

use strict;
use warnings;
use POSIX;
use File::Basename;
use Cwd 'abs_path';
use Term::ANSIColor qw(:constants);

my $P = $0;
my $D = dirname(abs_path($P));

my $V = '0.32';

use Getopt::Long qw(:config no_auto_abbrev);

my $quiet = 0;
my $tree = 1;
my $chk_signoff = 1;
my $chk_patch = 1;
my $tst_only;
my $emacs = 0;
my $terse = 0;
my $showfile = 0;
my $file = 0;
my $git = 0;
my %git_commits = ();
my $check = 0;
my $check_orig = 0;
my $summary = 1;
my $mailback = 0;
my $summary_file = 0;
my $show_types = 0;
my $list_types = 0;
my $fix = 0;
my $fix_inplace = 0;
my $root;
my %debug;
my %camelcase = ();
my %use_type = ();
my @use = ();
my %ignore_type = ();
my @ignore = ();
my $help = 0;
my $configuration_file = ".checkpatch.conf";
my $max_line_length = 80;
my $ignore_perl_version = 0;
my $minimum_perl_version = 5.10.0;
my $min_conf_desc_length = 4;
my $spelling_file = "$D/spelling.txt";
my $codespell = 0;
my $codespellfile = "/usr/share/codespell/dictionary.txt";
my $typedefsfile = "";
my $color = "auto";
my $allow_c99_comments = 1;

sub help {
	my ($exitcode) = @_;

	print << "EOM";
Usage: $P [OPTION]... [FILE]...
Version: $V

Options:
  -q, --quiet                quiet
  --no-tree                  run without a kernel tree
  --no-signoff               do not check for 'Signed-off-by' line
  --patch                    treat FILE as patchfile (default)
  --emacs                    emacs compile window format
  --terse                    one line per report
  --showfile                 emit diffed file position, not input file position
  -g, --git                  treat FILE as a single commit or git revision range
                             single git commit with:
                               <rev>
                               <rev>^
                               <rev>~n
                             multiple git commits with:
                               <rev1>..<rev2>
                               <rev1>...<rev2>
                               <rev>-<count>
                             git merges are ignored
  -f, --file                 treat FILE as regular source file
  --subjective, --strict     enable more subjective tests
  --list-types               list the possible message types
  --types TYPE(,TYPE2...)    show only these comma separated message types
  --ignore TYPE(,TYPE2...)   ignore various comma separated message types
  --show-types               show the specific message type in the output
  --max-line-length=n        set the maximum line length, if exceeded, warn
  --min-conf-desc-length=n   set the min description length, if shorter, warn
  --root=PATH                PATH to the kernel tree root
  --no-summary               suppress the per-file summary
  --mailback                 only produce a report in case of warnings/errors
  --summary-file             include the filename in summary
  --debug KEY=[0|1]          turn on/off debugging of KEY, where KEY is one of
                             'values', 'possible', 'type', and 'attr' (default
                             is all off)
  --test-only=WORD           report only warnings/errors containing WORD
                             literally
  --fix                      EXPERIMENTAL - may create horrible results
                             If correctable single-line errors exist, create
                             "<inputfile>.EXPERIMENTAL-checkpatch-fixes"
                             with potential errors corrected to the preferred
                             checkpatch style
  --fix-inplace              EXPERIMENTAL - may create horrible results
                             Is the same as --fix, but overwrites the input
                             file.  It's your fault if there's no backup or git
  --ignore-perl-version      override checking of perl version.  expect
                             runtime errors.
  --codespell                Use the codespell dictionary for spelling/typos
                             (default:/usr/share/codespell/dictionary.txt)
  --codespellfile            Use this codespell dictionary
  --typedefsfile             Read additional types from this file
  --color[=WHEN]             Use colors 'always', 'never', or only when output
                             is a terminal ('auto'). Default is 'auto'.
  -h, --help, --version      display this help and exit

When FILE is - read standard input.
EOM

	exit($exitcode);
}

sub uniq {
	my %seen;
	return grep { !$seen{$_}++ } @_;
}

sub list_types {
	my ($exitcode) = @_;

	my $count = 0;

	local $/ = undef;

	open(my $script, '<', abs_path($P)) or
	    die "$P: Can't read '$P' $!\n";

	my $text = <$script>;
	close($script);

	my @types = ();
	# Also catch when type or level is passed through a variable
	for ($text =~ /(?:(?:\bCHK|\bWARN|\bERROR|&\{\$msg_level})\s*\(|\$msg_type\s*=)\s*"([^"]+)"/g) {
		push (@types, $_);
	}
	@types = sort(uniq(@types));
	print("#\tMessage type\n\n");
	foreach my $type (@types) {
		print(++$count . "\t" . $type . "\n");
	}

	exit($exitcode);
}

my $conf = which_conf($configuration_file);
if (-f $conf) {
	my @conf_args;
	open(my $conffile, '<', "$conf")
	    or warn "$P: Can't find a readable $configuration_file file $!\n";

	while (<$conffile>) {
		my $line = $_;

		$line =~ s/\s*\n?$//g;
		$line =~ s/^\s*//g;
		$line =~ s/\s+/ /g;

		next if ($line =~ m/^\s*#/);
		next if ($line =~ m/^\s*$/);

		my @words = split(" ", $line);
		foreach my $word (@words) {
			last if ($word =~ m/^#/);
			push (@conf_args, $word);
		}
	}
	close($conffile);
	unshift(@ARGV, @conf_args) if @conf_args;
}

# Perl's Getopt::Long allows options to take optional arguments after a space.
# Prevent --color by itself from consuming other arguments
foreach (@ARGV) {
	if ($_ eq "--color" || $_ eq "-color") {
		$_ = "--color=$color";
	}
}

GetOptions(
	'q|quiet+'	=> \$quiet,
	'tree!'		=> \$tree,
	'signoff!'	=> \$chk_signoff,
	'patch!'	=> \$chk_patch,
	'emacs!'	=> \$emacs,
	'terse!'	=> \$terse,
	'showfile!'	=> \$showfile,
	'f|file!'	=> \$file,
	'g|git!'	=> \$git,
	'subjective!'	=> \$check,
	'strict!'	=> \$check,
	'ignore=s'	=> \@ignore,
	'types=s'	=> \@use,
	'show-types!'	=> \$show_types,
	'list-types!'	=> \$list_types,
	'max-line-length=i' => \$max_line_length,
	'min-conf-desc-length=i' => \$min_conf_desc_length,
	'root=s'	=> \$root,
	'summary!'	=> \$summary,
	'mailback!'	=> \$mailback,
	'summary-file!'	=> \$summary_file,
	'fix!'		=> \$fix,
	'fix-inplace!'	=> \$fix_inplace,
	'ignore-perl-version!' => \$ignore_perl_version,
	'debug=s'	=> \%debug,
	'test-only=s'	=> \$tst_only,
	'codespell!'	=> \$codespell,
	'codespellfile=s'	=> \$codespellfile,
	'typedefsfile=s'	=> \$typedefsfile,
	'color=s'	=> \$color,
	'no-color'	=> \$color,	#keep old behaviors of -nocolor
	'nocolor'	=> \$color,	#keep old behaviors of -nocolor
	'h|help'	=> \$help,
	'version'	=> \$help
) or help(1);

help(0) if ($help);

list_types(0) if ($list_types);

$fix = 1 if ($fix_inplace);
$check_orig = $check;

my $exit = 0;

if ($^V && $^V lt $minimum_perl_version) {
	printf "$P: requires at least perl version %vd\n", $minimum_perl_version;
	if (!$ignore_perl_version) {
		exit(1);
	}
}

#if no filenames are given, push '-' to read patch from stdin
if ($#ARGV < 0) {
	push(@ARGV, '-');
}

if ($color =~ /^[01]$/) {
	$color = !$color;
} elsif ($color =~ /^always$/i) {
	$color = 1;
} elsif ($color =~ /^never$/i) {
	$color = 0;
} elsif ($color =~ /^auto$/i) {
	$color = (-t STDOUT);
} else {
	die "Invalid color mode: $color\n";
}

sub hash_save_array_words {
	my ($hashRef, $arrayRef) = @_;

	my @array = split(/,/, join(',', @$arrayRef));
	foreach my $word (@array) {
		$word =~ s/\s*\n?$//g;
		$word =~ s/^\s*//g;
		$word =~ s/\s+/ /g;
		$word =~ tr/[a-z]/[A-Z]/;

		next if ($word =~ m/^\s*#/);
		next if ($word =~ m/^\s*$/);

		$hashRef->{$word}++;
	}
}

sub hash_show_words {
	my ($hashRef, $prefix) = @_;

	if (keys %$hashRef) {
		print "\nNOTE: $prefix message types:";
		foreach my $word (sort keys %$hashRef) {
			print " $word";
		}
		print "\n";
	}
}

hash_save_array_words(\%ignore_type, \@ignore);
hash_save_array_words(\%use_type, \@use);

my $dbg_values = 0;
my $dbg_possible = 0;
my $dbg_type = 0;
my $dbg_attr = 0;
for my $key (keys %debug) {
	## no critic
	eval "\${dbg_$key} = '$debug{$key}';";
	die "$@" if ($@);
}

my $rpt_cleaners = 0;

if ($terse) {
	$emacs = 1;
	$quiet++;
}

if ($tree) {
	if (defined $root) {
		if (!top_of_kernel_tree($root)) {
			die "$P: $root: --root does not point at a valid tree\n";
		}
	} else {
		if (top_of_kernel_tree('.')) {
			$root = '.';
		} elsif ($0 =~ m@(.*)/scripts/[^/]*$@ &&
						top_of_kernel_tree($1)) {
			$root = $1;
		}
	}

	if (!defined $root) {
		print "Must be run from the top-level dir. of a kernel tree\n";
		exit(2);
	}
}

my $emitted_corrupt = 0;

our $Ident	= qr{
			[A-Za-z_][A-Za-z\d_]*
			(?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
		}x;
our $Storage	= qr{extern|static|asmlinkage};
our $Sparse	= qr{
			__user|
			__kernel|
			__force|
			__iomem|
			__must_check|
			__init_refok|
			__kprobes|
			__ref|
			__rcu|
			__private
		}x;
our $InitAttributePrefix = qr{__(?:mem|cpu|dev|net_|)};
our $InitAttributeData = qr{$InitAttributePrefix(?:initdata\b)};
our $InitAttributeConst = qr{$InitAttributePrefix(?:initconst\b)};
our $InitAttributeInit = qr{$InitAttributePrefix(?:init\b)};
our $InitAttribute = qr{$InitAttributeData|$InitAttributeConst|$InitAttributeInit};

# Notes to $Attribute:
# We need \b after 'init' otherwise 'initconst' will cause a false positive in a check
our $Attribute	= qr{
			const|
			_Atomic|
			__percpu|
			__nocast|
			__safe|
			__bitwise|
			__packed__|
			__packed2__|
			__naked|
			__maybe_unused|
			__always_unused|
			__noreturn|
			__used|
			__cold|
			__pure|
			__noclone|
			__deprecated|
			__read_mostly|
			__kprobes|
			$InitAttribute|
			____cacheline_aligned|
			____cacheline_aligned_in_smp|
			____cacheline_internodealigned_in_smp|
			__weak
		  }x;
our $Modifier;
our $Inline	= qr{inline|__always_inline|noinline|__inline|__inline__};
our $Member	= qr{->$Ident|\.$Ident|\[[^]]*\]};
our $Lval	= qr{$Ident(?:$Member)*};

our $Int_type	= qr{(?i)llu|ull|ll|lu|ul|l|u};
our $Binary	= qr{(?i)0b[01]+$Int_type?};
our $Hex	= qr{(?i)0x[0-9a-f]+$Int_type?};
our $Int	= qr{[0-9]+$Int_type?};
our $Octal	= qr{0[0-7]+$Int_type?};
our $String	= qr{"[X\t]*"};
our $Float_hex	= qr{(?i)0x[0-9a-f]+p-?[0-9]+[fl]?};
our $Float_dec	= qr{(?i)(?:[0-9]+\.[0-9]*|[0-9]*\.[0-9]+)(?:e-?[0-9]+)?[fl]?};
our $Float_int	= qr{(?i)[0-9]+e-?[0-9]+[fl]?};
our $Float	= qr{$Float_hex|$Float_dec|$Float_int};
our $Constant	= qr{$Float|$Binary|$Octal|$Hex|$Int};
our $Assignment	= qr{\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=};
our $Compare    = qr{<=|>=|==|!=|<|(?<!-)>};
our $Arithmetic = qr{\+|-|\*|\/|%};
our $Operators	= qr{
			<=|>=|==|!=|
			=>|->|<<|>>|<|>|!|~|
			&&|\|\||,|\^|\+\+|--|&|\||$Arithmetic
		  }x;

our $c90_Keywords = qr{do|for|while|if|else|return|goto|continue|switch|default|case|break}x;
our $Iterators	= qr{
			frr_each|frr_each_safe|frr_each_from|
			frr_with_mutex|frr_with_privs|
			LIST_FOREACH|LIST_FOREACH_SAFE|
			SLIST_FOREACH|SLIST_FOREACH_SAFE|SLIST_FOREACH_PREVPTR|
			STAILQ_FOREACH|STAILQ_FOREACH_SAFE|
			TAILQ_FOREACH|TAILQ_FOREACH_SAFE|TAILQ_FOREACH_REVERSE|TAILQ_FOREACH_REVERSE_SAFE|
			RB_FOREACH|RB_FOREACH_SAFE|RB_FOREACH_REVERSE|RB_FOREACH_REVERSE_SAFE|
			SPLAY_FOREACH|
			FOR_ALL_INTERFACES|FOR_ALL_INTERFACES_ADDRESSES|JSON_FOREACH|
			LY_FOR_KEYS|LY_LIST_FOR|LY_TREE_FOR|LY_TREE_DFS_BEGIN|LYD_TREE_DFS_BEGIN|
			RE_DEST_FOREACH_ROUTE|RE_DEST_FOREACH_ROUTE_SAFE|
			RNODE_FOREACH_RE|RNODE_FOREACH_RE_SAFE|
			UPDGRP_FOREACH_SUBGRP|UPDGRP_FOREACH_SUBGRP_SAFE|
			SUBGRP_FOREACH_PEER|SUBGRP_FOREACH_PEER_SAFE|
			SUBGRP_FOREACH_ADJ|SUBGRP_FOREACH_ADJ_SAFE|
			AF_FOREACH|FOREACH_AFI_SAFI|FOREACH_SAFI|
			LSDB_LOOP
		  }x;

our $BasicType;
our $NonptrType;
our $NonptrTypeMisordered;
our $NonptrTypeWithAttr;
our $Type;
our $TypeMisordered;
our $Declare;
our $DeclareMisordered;

our $NON_ASCII_UTF8	= qr{
	[\xC2-\xDF][\x80-\xBF]               # non-overlong 2-byte
	|  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
	| [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
	|  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
	|  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
	| [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
	|  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
}x;

our $UTF8	= qr{
	[\x09\x0A\x0D\x20-\x7E]              # ASCII
	| $NON_ASCII_UTF8
}x;

our $typeC99Typedefs = qr{(?:__)?(?:[us]_?)?int_?(?:8|16|32|64)_t};
our $typeOtherOSTypedefs = qr{(?x:
	u_(?:char|short|int|long) |          # bsd
	u(?:nchar|short|int|long)            # sysv
)};
our $typeKernelTypedefs = qr{(?x:
	(?:__)?(?:u|s|be|le)(?:8|16|32|64)|
	atomic_t
)};
our $typeTypedefs = qr{(?x:
	$typeC99Typedefs\b|
	$typeOtherOSTypedefs\b|
	$typeKernelTypedefs\b
)};

our $zero_initializer = qr{(?:(?:0[xX])?0+$Int_type?|NULL|false)\b};

our $logFunctions = qr{(?x:
	printk(?:_ratelimited|_once|_deferred_once|_deferred|)|
	(?:[a-z0-9]+_){1,2}(?:printk|emerg|alert|crit|err|warning|warn|notice|info|debug|dbg|vdbg|devel|cont|WARN)(?:_ratelimited|_once|)|
	TP_printk|
	WARN(?:_RATELIMIT|_ONCE|)|
	panic|
	MODULE_[A-Z_]+|
	seq_vprintf|seq_printf|seq_puts
)};

our $signature_tags = qr{(?xi:
	Signed-off-by:|
	Acked-by:|
	Tested-by:|
	Reviewed-by:|
	Reported-by:|
	Suggested-by:|
	To:|
	Cc:
)};

our @typeListMisordered = (
	qr{char\s+(?:un)?signed},
	qr{int\s+(?:(?:un)?signed\s+)?short\s},
	qr{int\s+short(?:\s+(?:un)?signed)},
	qr{short\s+int(?:\s+(?:un)?signed)},
	qr{(?:un)?signed\s+int\s+short},
	qr{short\s+(?:un)?signed},
	qr{long\s+int\s+(?:un)?signed},
	qr{int\s+long\s+(?:un)?signed},
	qr{long\s+(?:un)?signed\s+int},
	qr{int\s+(?:un)?signed\s+long},
	qr{int\s+(?:un)?signed},
	qr{int\s+long\s+long\s+(?:un)?signed},
	qr{long\s+long\s+int\s+(?:un)?signed},
	qr{long\s+long\s+(?:un)?signed\s+int},
	qr{long\s+long\s+(?:un)?signed},
	qr{long\s+(?:un)?signed},
);

our @typeList = (
	qr{void},
	qr{(?:(?:un)?signed\s+)?char},
	qr{(?:(?:un)?signed\s+)?short\s+int},
	qr{(?:(?:un)?signed\s+)?short},
	qr{(?:(?:un)?signed\s+)?int},
	qr{(?:(?:un)?signed\s+)?long\s+int},
	qr{(?:(?:un)?signed\s+)?long\s+long\s+int},
	qr{(?:(?:un)?signed\s+)?long\s+long},
	qr{(?:(?:un)?signed\s+)?long},
	qr{(?:un)?signed},
	qr{float},
	qr{double},
	qr{bool},
	qr{struct\s+$Ident},
	qr{union\s+$Ident},
	qr{enum\s+$Ident},
	qr{${Ident}_t},
	qr{${Ident}_handler},
	qr{${Ident}_handler_fn},
	@typeListMisordered,
);

our $C90_int_types = qr{(?x:
	long\s+long\s+int\s+(?:un)?signed|
	long\s+long\s+(?:un)?signed\s+int|
	long\s+long\s+(?:un)?signed|
	(?:(?:un)?signed\s+)?long\s+long\s+int|
	(?:(?:un)?signed\s+)?long\s+long|
	int\s+long\s+long\s+(?:un)?signed|
	int\s+(?:(?:un)?signed\s+)?long\s+long|

	long\s+int\s+(?:un)?signed|
	long\s+(?:un)?signed\s+int|
	long\s+(?:un)?signed|
	(?:(?:un)?signed\s+)?long\s+int|
	(?:(?:un)?signed\s+)?long|
	int\s+long\s+(?:un)?signed|
	int\s+(?:(?:un)?signed\s+)?long|

	int\s+(?:un)?signed|
	(?:(?:un)?signed\s+)?int
)};

our @typeListFile = ();
our @typeListWithAttr = (
	@typeList,
	qr{struct\s+$InitAttribute\s+$Ident},
	qr{union\s+$InitAttribute\s+$Ident},
);

our @modifierList = (
	qr{fastcall},
);
our @modifierListFile = ();

our @mode_permission_funcs = (
	["module_param", 3],
	["module_param_(?:array|named|string)", 4],
	["module_param_array_named", 5],
	["debugfs_create_(?:file|u8|u16|u32|u64|x8|x16|x32|x64|size_t|atomic_t|bool|blob|regset32|u32_array)", 2],
	["proc_create(?:_data|)", 2],
	["(?:CLASS|DEVICE|SENSOR|SENSOR_DEVICE|IIO_DEVICE)_ATTR", 2],
	["IIO_DEV_ATTR_[A-Z_]+", 1],
	["SENSOR_(?:DEVICE_|)ATTR_2", 2],
	["SENSOR_TEMPLATE(?:_2|)", 3],
	["__ATTR", 2],
);

#Create a search pattern for all these functions to speed up a loop below
our $mode_perms_search = "";
foreach my $entry (@mode_permission_funcs) {
	$mode_perms_search .= '|' if ($mode_perms_search ne "");
	$mode_perms_search .= $entry->[0];
}

our $mode_perms_world_writable = qr{
	S_IWUGO		|
	S_IWOTH		|
	S_IRWXUGO	|
	S_IALLUGO	|
	0[0-7][0-7][2367]
}x;

our %mode_permission_string_types = (
	"S_IRWXU" => 0700,
	"S_IRUSR" => 0400,
	"S_IWUSR" => 0200,
	"S_IXUSR" => 0100,
	"S_IRWXG" => 0070,
	"S_IRGRP" => 0040,
	"S_IWGRP" => 0020,
	"S_IXGRP" => 0010,
	"S_IRWXO" => 0007,
	"S_IROTH" => 0004,
	"S_IWOTH" => 0002,
	"S_IXOTH" => 0001,
	"S_IRWXUGO" => 0777,
	"S_IRUGO" => 0444,
	"S_IWUGO" => 0222,
	"S_IXUGO" => 0111,
);

#Create a search pattern for all these strings to speed up a loop below
our $mode_perms_string_search = "";
foreach my $entry (keys %mode_permission_string_types) {
	$mode_perms_string_search .= '|' if ($mode_perms_string_search ne "");
	$mode_perms_string_search .= $entry;
}

our $allowed_asm_includes = qr{(?x:
	irq|
	memory|
	time|
	reboot
)};
# memory.h: ARM has a custom one

# Load common spelling mistakes and build regular expression list.
my $misspellings;
my %spelling_fix;

if (open(my $spelling, '<', $spelling_file)) {
	while (<$spelling>) {
		my $line = $_;

		$line =~ s/\s*\n?$//g;
		$line =~ s/^\s*//g;

		next if ($line =~ m/^\s*#/);
		next if ($line =~ m/^\s*$/);

		my ($suspect, $fix) = split(/\|\|/, $line);

		$spelling_fix{$suspect} = $fix;
	}
	close($spelling);
} else {
	warn "No typos will be found - file '$spelling_file': $!\n";
}

if ($codespell) {
	if (open(my $spelling, '<', $codespellfile)) {
		while (<$spelling>) {
			my $line = $_;

			$line =~ s/\s*\n?$//g;
			$line =~ s/^\s*//g;

			next if ($line =~ m/^\s*#/);
			next if ($line =~ m/^\s*$/);
			next if ($line =~ m/, disabled/i);

			$line =~ s/,.*$//;

			my ($suspect, $fix) = split(/->/, $line);

			$spelling_fix{$suspect} = $fix;
		}
		close($spelling);
	} else {
		warn "No codespell typos will be found - file '$codespellfile': $!\n";
	}
}

$misspellings = join("|", sort keys %spelling_fix) if keys %spelling_fix;

sub read_words {
	my ($wordsRef, $file) = @_;

	if (open(my $words, '<', $file)) {
		while (<$words>) {
			my $line = $_;

			$line =~ s/\s*\n?$//g;
			$line =~ s/^\s*//g;

			next if ($line =~ m/^\s*#/);
			next if ($line =~ m/^\s*$/);
			if ($line =~ /\s/) {
				print("$file: '$line' invalid - ignored\n");
				next;
			}

			$$wordsRef .= '|' if ($$wordsRef ne "");
			$$wordsRef .= $line;
		}
		close($file);
		return 1;
	}

	return 0;
}

my $typeOtherTypedefs = "";
if (length($typedefsfile)) {
	read_words(\$typeOtherTypedefs, $typedefsfile)
	    or warn "No additional types will be considered - file '$typedefsfile': $!\n";
}
$typeTypedefs .= '|' . $typeOtherTypedefs if ($typeOtherTypedefs ne "");

sub build_types {
	my $mods = "(?x:  \n" . join("|\n  ", (@modifierList, @modifierListFile)) . "\n)";
	my $all = "(?x:  \n" . join("|\n  ", (@typeList, @typeListFile)) . "\n)";
	my $Misordered = "(?x:  \n" . join("|\n  ", @typeListMisordered) . "\n)";
	my $allWithAttr = "(?x:  \n" . join("|\n  ", @typeListWithAttr) . "\n)";
	$Modifier	= qr{(?:$Attribute|$Sparse|$mods)};
	$BasicType	= qr{
				(?:$typeTypedefs\b)|
				(?:${all}\b)
		}x;
	$NonptrType	= qr{
			(?:$Modifier\s+|const\s+)*
			(?:
				(?:typeof|__typeof__)\s*\([^\)]*\)|
				(?:$typeTypedefs\b)|
				(?:${all}\b)
			)
			(?:\s+$Modifier|\s+const)*
		  }x;
	$NonptrTypeMisordered	= qr{
			(?:$Modifier\s+|const\s+)*
			(?:
				(?:${Misordered}\b)
			)
			(?:\s+$Modifier|\s+const)*
		  }x;
	$NonptrTypeWithAttr	= qr{
			(?:$Modifier\s+|const\s+)*
			(?:
				(?:typeof|__typeof__)\s*\([^\)]*\)|
				(?:$typeTypedefs\b)|
				(?:${allWithAttr}\b)
			)
			(?:\s+$Modifier|\s+const)*
		  }x;
	$Type	= qr{
			$NonptrType
			(?:(?:\s|\*|\[\])+\s*const|(?:\s|\*\s*(?:const\s*)?|\[\])+|(?:\s*\[\s*\])+)?
			(?:\s+$Inline|\s+$Modifier)*
		  }x;
	$TypeMisordered	= qr{
			$NonptrTypeMisordered
			(?:(?:\s|\*|\[\])+\s*const|(?:\s|\*\s*(?:const\s*)?|\[\])+|(?:\s*\[\s*\])+)?
			(?:\s+$Inline|\s+$Modifier)*
		  }x;
	$Declare	= qr{(?:$Storage\s+(?:$Inline\s+)?)?$Type};
	$DeclareMisordered	= qr{(?:$Storage\s+(?:$Inline\s+)?)?$TypeMisordered};
}
build_types();

our $Typecast	= qr{\s*(\(\s*$NonptrType\s*\)){0,1}\s*};

# Using $balanced_parens, $LvalOrFunc, or $FuncArg
# requires at least perl version v5.10.0
# Any use must be runtime checked with $^V

our $balanced_parens = qr/(\((?:[^\(\)]++|(?-1))*\))/;
our $LvalOrFunc	= qr{((?:[\&\*]\s*)?$Lval)\s*($balanced_parens{0,1})\s*};
our $FuncArg = qr{$Typecast{0,1}($LvalOrFunc|$Constant|$String)};

our $declaration_macros = qr{(?x:
	(?:$Storage\s+)?(?:[A-Z_][A-Z0-9]*_){0,2}(?:DEFINE|DECLARE)(?:_[A-Z0-9]+){1,6}\s*\(|
	(?:$Storage\s+)?[HLP]?LIST_HEAD\s*\(|
	(?:$Storage\s+)?${Type}\s+uninitialized_var\s*\(
)};

sub deparenthesize {
	my ($string) = @_;
	return "" if (!defined($string));

	while ($string =~ /^\s*\(.*\)\s*$/) {
		$string =~ s@^\s*\(\s*@@;
		$string =~ s@\s*\)\s*$@@;
	}

	$string =~ s@\s+@ @g;

	return $string;
}

sub seed_camelcase_file {
	my ($file) = @_;

	return if (!(-f $file));

	local $/;

	open(my $include_file, '<', "$file")
	    or warn "$P: Can't read '$file' $!\n";
	my $text = <$include_file>;
	close($include_file);

	my @lines = split('\n', $text);

	foreach my $line (@lines) {
		next if ($line !~ /(?:[A-Z][a-z]|[a-z][A-Z])/);
		if ($line =~ /^[ \t]*(?:#[ \t]*define|typedef\s+$Type)\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)/) {
			$camelcase{$1} = 1;
		} elsif ($line =~ /^\s*$Declare\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)\s*[\(\[,;]/) {
			$camelcase{$1} = 1;
		} elsif ($line =~ /^\s*(?:union|struct|enum)\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)\s*[;\{]/) {
			$camelcase{$1} = 1;
		}
	}
}

sub is_maintained_obsolete {
	my ($filename) = @_;

	return 0 if (!$tree || !(-e "$root/scripts/get_maintainer.pl"));

	my $status = `perl $root/scripts/get_maintainer.pl --status --nom --nol --nogit --nogit-fallback -f $filename 2>&1`;

	return $status =~ /obsolete/i;
}

my $camelcase_seeded = 0;
sub seed_camelcase_includes {
	return if ($camelcase_seeded);

	my $files;
	my $camelcase_cache = "";
	my @include_files = ();

	$camelcase_seeded = 1;

	if (-e ".git") {
		my $git_last_include_commit = `git log --no-merges --pretty=format:"%h%n" -1 -- include`;
		chomp $git_last_include_commit;
		$camelcase_cache = ".checkpatch-camelcase.git.$git_last_include_commit";
	} else {
		my $last_mod_date = 0;
		$files = `find $root/include -name "*.h"`;
		@include_files = split('\n', $files);
		foreach my $file (@include_files) {
			my $date = POSIX::strftime("%Y%m%d%H%M",
						   localtime((stat $file)[9]));
			$last_mod_date = $date if ($last_mod_date < $date);
		}
		$camelcase_cache = ".checkpatch-camelcase.date.$last_mod_date";
	}

	if ($camelcase_cache ne "" && -f $camelcase_cache) {
		open(my $camelcase_file, '<', "$camelcase_cache")
		    or warn "$P: Can't read '$camelcase_cache' $!\n";
		while (<$camelcase_file>) {
			chomp;
			$camelcase{$_} = 1;
		}
		close($camelcase_file);

		return;
	}

	if (-e ".git") {
		$files = `git ls-files "include/*.h"`;
		@include_files = split('\n', $files);
	}

	foreach my $file (@include_files) {
		seed_camelcase_file($file);
	}

	if ($camelcase_cache ne "") {
		unlink glob ".checkpatch-camelcase.*";
		open(my $camelcase_file, '>', "$camelcase_cache")
		    or warn "$P: Can't write '$camelcase_cache' $!\n";
		foreach (sort { lc($a) cmp lc($b) } keys(%camelcase)) {
			print $camelcase_file ("$_\n");
		}
		close($camelcase_file);
	}
}

sub git_commit_info {
	my ($commit, $id, $desc) = @_;

	return ($id, $desc) if ((which("git") eq "") || !(-e ".git"));

	my $output = `git log --no-color --format='%H %s' -1 $commit 2>&1`;
	$output =~ s/^\s*//gm;
	my @lines = split("\n", $output);

	return ($id, $desc) if ($#lines < 0);

	if ($lines[0] =~ /^error: short SHA1 $commit is ambiguous\./) {
# Maybe one day convert this block of bash into something that returns
# all matching commit ids, but it's very slow...
#
#		echo "checking commits $1..."
#		git rev-list --remotes | grep -i "^$1" |
#		while read line ; do
#		    git log --format='%H %s' -1 $line |
#		    echo "commit $(cut -c 1-12,41-)"
#		done
	} elsif ($lines[0] =~ /^fatal: ambiguous argument '$commit': unknown revision or path not in the working tree\./) {
		$id = undef;
	} else {
		$id = substr($lines[0], 0, 12);
		$desc = substr($lines[0], 41);
	}

	return ($id, $desc);
}

$chk_signoff = 0 if ($file);

my @rawlines = ();
my @lines = ();
my @fixed = ();
my @fixed_inserted = ();
my @fixed_deleted = ();
my $fixlinenr = -1;

# If input is git commits, extract all commits from the commit expressions.
# For example, HEAD-3 means we need check 'HEAD, HEAD~1, HEAD~2'.
die "$P: No git repository found\n" if ($git && !-e ".git");

if ($git) {
	my @commits = ();
	foreach my $commit_expr (@ARGV) {
		my $git_range;
		if ($commit_expr =~ m/^(.*)-(\d+)$/) {
			$git_range = "-$2 $1";
		} elsif ($commit_expr =~ m/\.\./) {
			$git_range = "$commit_expr";
		} else {
			$git_range = "-1 $commit_expr";
		}
		my $lines = `git log --no-color --no-merges --pretty=format:'%H %s' $git_range`;
		foreach my $line (split(/\n/, $lines)) {
			$line =~ /^([0-9a-fA-F]{40,40}) (.*)$/;
			next if (!defined($1) || !defined($2));
			my $sha1 = $1;
			my $subject = $2;
			unshift(@commits, $sha1);
			$git_commits{$sha1} = $subject;
		}
	}
	die "$P: no git commits after extraction!\n" if (@commits == 0);
	@ARGV = @commits;
}

my $vname;
for my $filename (@ARGV) {
	my $FILE;
	if ($git) {
		open($FILE, '-|', "git format-patch -M --stdout -1 $filename") ||
			die "$P: $filename: git format-patch failed - $!\n";
	} elsif ($file) {
		open($FILE, '-|', "diff -u /dev/null $filename") ||
			die "$P: $filename: diff failed - $!\n";
	} elsif ($filename eq '-') {
		open($FILE, '<&STDIN');
	} else {
		open($FILE, '<', "$filename") ||
			die "$P: $filename: open failed - $!\n";
	}
	if ($filename eq '-') {
		$vname = 'Your patch';
	} elsif ($git) {
		$vname = "Commit " . substr($filename, 0, 12) . ' ("' . $git_commits{$filename} . '")';
	} else {
		$vname = $filename;
	}
	while (<$FILE>) {
		chomp;
		push(@rawlines, $_);
	}
	close($FILE);

	if ($#ARGV > 0 && $quiet == 0) {
		print '-' x length($vname) . "\n";
		print "$vname\n";
		print '-' x length($vname) . "\n";
	}

	if (!process($filename)) {
		$exit = 1;
	}
	@rawlines = ();
	@lines = ();
	@fixed = ();
	@fixed_inserted = ();
	@fixed_deleted = ();
	$fixlinenr = -1;
	@modifierListFile = ();
	@typeListFile = ();
	build_types();
}

if (!$quiet) {
	hash_show_words(\%use_type, "Used");
	hash_show_words(\%ignore_type, "Ignored");

	if ($^V lt 5.10.0) {
		print << "EOM"

NOTE: perl $^V is not modern enough to detect all possible issues.
      An upgrade to at least perl v5.10.0 is suggested.
EOM
	}
	if ($exit) {
		print << "EOM"

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
EOM
	}
}

exit($exit);

sub top_of_kernel_tree {
	my ($root) = @_;

	my @tree_check = (
		"COPYING", "configure.ac", "Makefile.am",
		"README.md", "doc", "lib", "vtysh", "watchfrr", "tests",
		"zebra", "bgpd", "ospfd", "ospf6d", "isisd", "staticd",
	);

	foreach my $check (@tree_check) {
		if (! -e $root . '/' . $check) {
			return 0;
		}
	}
	return 1;
}

sub parse_email {
	my ($formatted_email) = @_;

	my $name = "";
	my $address = "";
	my $comment = "";

	if ($formatted_email =~ /^(.*)<(\S+\@\S+)>(.*)$/) {
		$name = $1;
		$address = $2;
		$comment = $3 if defined $3;
	} elsif ($formatted_email =~ /^\s*<(\S+\@\S+)>(.*)$/) {
		$address = $1;
		$comment = $2 if defined $2;
	} elsif ($formatted_email =~ /(\S+\@\S+)(.*)$/) {
		$address = $1;
		$comment = $2 if defined $2;
		$formatted_email =~ s/$address.*$//;
		$name = $formatted_email;
		$name = trim($name);
		$name =~ s/^\"|\"$//g;
		# If there's a name left after stripping spaces and
		# leading quotes, and the address doesn't have both
		# leading and trailing angle brackets, the address
		# is invalid. ie:
		#   "joe smith joe@smith.com" bad
		#   "joe smith <joe@smith.com" bad
		if ($name ne "" && $address !~ /^<[^>]+>$/) {
			$name = "";
			$address = "";
			$comment = "";
		}
	}

	$name = trim($name);
	$name =~ s/^\"|\"$//g;
	$address = trim($address);
	$address =~ s/^\<|\>$//g;

	if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
		$name =~ s/(?<!\\)"/\\"/g; ##escape quotes
		$name = "\"$name\"";
	}

	return ($name, $address, $comment);
}

sub format_email {
	my ($name, $address) = @_;

	my $formatted_email;

	$name = trim($name);
	$name =~ s/^\"|\"$//g;
	$address = trim($address);

	if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
		$name =~ s/(?<!\\)"/\\"/g; ##escape quotes
		$name = "\"$name\"";
	}

	if ("$name" eq "") {
		$formatted_email = "$address";
	} else {
		$formatted_email = "$name <$address>";
	}

	return $formatted_email;
}

sub which {
	my ($bin) = @_;

	foreach my $path (split(/:/, $ENV{PATH})) {
		if (-e "$path/$bin") {
			return "$path/$bin";
		}
	}

	return "";
}

sub which_conf {
	my ($conf) = @_;

	foreach my $path (split(/:/, ".:$ENV{HOME}:.scripts")) {
		if (-e "$path/$conf") {
			return "$path/$conf";
		}
	}

	return "";
}

sub expand_tabs {
	my ($str) = @_;

	my $res = '';
	my $n = 0;
	for my $c (split(//, $str)) {
		if ($c eq "\t") {
			$res .= ' ';
			$n++;
			for (; ($n % 8) != 0; $n++) {
				$res .= ' ';
			}
			next;
		}
		$res .= $c;
		$n++;
	}

	return $res;
}
sub copy_spacing {
	(my $res = shift) =~ tr/\t/ /c;
	return $res;
}

sub line_stats {
	my ($line) = @_;

	# Drop the diff line leader and expand tabs
	$line =~ s/^.//;
	$line = expand_tabs($line);

	# Pick the indent from the front of the line.
	my ($white) = ($line =~ /^(\s*)/);

	return (length($line), length($white));
}

my $sanitise_quote = '';

sub sanitise_line_reset {
	my ($in_comment) = @_;

	if ($in_comment) {
		$sanitise_quote = '*/';
	} else {
		$sanitise_quote = '';
	}
}
sub sanitise_line {
	my ($line) = @_;

	my $res = '';
	my $l = '';

	my $qlen = 0;
	my $off = 0;
	my $c;

	# Always copy over the diff marker.
	$res = substr($line, 0, 1);

	for ($off = 1; $off < length($line); $off++) {
		$c = substr($line, $off, 1);

		# Comments we are wacking completly including the begin
		# and end, all to $;.
		if ($sanitise_quote eq '' && substr($line, $off, 2) eq '/*') {
			$sanitise_quote = '*/';

			substr($res, $off, 2, "$;$;");
			$off++;
			next;
		}
		if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
			$sanitise_quote = '';
			substr($res, $off, 2, "$;$;");
			$off++;
			next;
		}
		if ($sanitise_quote eq '' && substr($line, $off, 2) eq '//') {
			$sanitise_quote = '//';

			substr($res, $off, 2, $sanitise_quote);
			$off++;
			next;
		}

		# A \ in a string means ignore the next character.
		if (($sanitise_quote eq "'" || $sanitise_quote eq '"') &&
		    $c eq "\\") {
			substr($res, $off, 2, 'XX');
			$off++;
			next;
		}
		# Regular quotes.
		if ($c eq "'" || $c eq '"') {
			if ($sanitise_quote eq '') {
				$sanitise_quote = $c;

				substr($res, $off, 1, $c);
				next;
			} elsif ($sanitise_quote eq $c) {
				$sanitise_quote = '';
			}
		}

		#print "c<$c> SQ<$sanitise_quote>\n";
		if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
			substr($res, $off, 1, $;);
		} elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
			substr($res, $off, 1, $;);
		} elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
			substr($res, $off, 1, 'X');
		} else {
			substr($res, $off, 1, $c);
		}
	}

	if ($sanitise_quote eq '//') {
		$sanitise_quote = '';
	}

	# The pathname on a #include may be surrounded by '<' and '>'.
	if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
		my $clean = 'X' x length($1);
		$res =~ s@\<.*\>@<$clean>@;

	# The whole of a #error is a string.
	} elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
		my $clean = 'X' x length($1);
		$res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
	}

	return $res;
}

sub get_quoted_string {
	my ($line, $rawline) = @_;

	return "" if ($line !~ m/($String)/g);
	return substr($rawline, $-[0], $+[0] - $-[0]);
}

sub ctx_statement_block {
	my ($linenr, $remain, $off) = @_;
	my $line = $linenr - 1;
	my $blk = '';
	my $soff = $off;
	my $coff = $off - 1;
	my $coff_set = 0;

	my $loff = 0;

	my $type = '';
	my $level = 0;
	my @stack = ();
	my $p;
	my $c;
	my $len = 0;

	my $remainder;
	while (1) {
		@stack = (['', 0]) if ($#stack == -1);

		#warn "CSB: blk<$blk> remain<$remain>\n";
		# If we are about to drop off the end, pull in more
		# context.
		if ($off >= $len) {
			for (; $remain > 0; $line++) {
				last if (!defined $lines[$line]);
				next if ($lines[$line] =~ /^-/);
				$remain--;
				$loff = $len;
				$blk .= $lines[$line] . "\n";
				$len = length($blk);
				$line++;
				last;
			}
			# Bail if there is no further context.
			#warn "CSB: blk<$blk> off<$off> len<$len>\n";
			if ($off >= $len) {
				last;
			}
			if ($level == 0 && substr($blk, $off) =~ /^.\s*#\s*define/) {
				$level++;
				$type = '#';
			}
		}
		$p = $c;
		$c = substr($blk, $off, 1);
		$remainder = substr($blk, $off);

		#warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";

		# Handle nested #if/#else.
		if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
			push(@stack, [ $type, $level ]);
		} elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
			($type, $level) = @{$stack[$#stack - 1]};
		} elsif ($remainder =~ /^#\s*endif\b/) {
			($type, $level) = @{pop(@stack)};
		}

		# Statement ends at the ';' or a close '}' at the
		# outermost level.
		if ($level == 0 && $c eq ';') {
			last;
		}

		# An else is really a conditional as long as its not else if
		if ($level == 0 && $coff_set == 0 &&
				(!defined($p) || $p =~ /(?:\s|\}|\+)/) &&
				$remainder =~ /^(else)(?:\s|{)/ &&
				$remainder !~ /^else\s+if\b/) {
			$coff = $off + length($1) - 1;
			$coff_set = 1;
			#warn "CSB: mark coff<$coff> soff<$soff> 1<$1>\n";
			#warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]\n";
		}

		if (($type eq '' || $type eq '(') && $c eq '(') {
			$level++;
			$type = '(';
		}
		if ($type eq '(' && $c eq ')') {
			$level--;
			$type = ($level != 0)? '(' : '';

			if ($level == 0 && $coff < $soff) {
				$coff = $off;
				$coff_set = 1;
				#warn "CSB: mark coff<$coff>\n";
			}
		}
		if (($type eq '' || $type eq '{') && $c eq '{') {
			$level++;
			$type = '{';
		}
		if ($type eq '{' && $c eq '}') {
			$level--;
			$type = ($level != 0)? '{' : '';

			if ($level == 0) {
				if (substr($blk, $off + 1, 1) eq ';') {
					$off++;
				}
				last;
			}
		}
		# Preprocessor commands end at the newline unless escaped.
		if ($type eq '#' && $c eq "\n" && $p ne "\\") {
			$level--;
			$type = '';
			$off++;
			last;
		}
		$off++;
	}
	# We are truly at the end, so shuffle to the next line.
	if ($off == $len) {
		$loff = $len + 1;
		$line++;
		$remain--;
	}

	my $statement = substr($blk, $soff, $off - $soff + 1);
	my $condition = substr($blk, $soff, $coff - $soff + 1);

	#warn "STATEMENT<$statement>\n";
	#warn "CONDITION<$condition>\n";

	#print "coff<$coff> soff<$off> loff<$loff>\n";

	return ($statement, $condition,
			$line, $remain + 1, $off - $loff + 1, $level);
}

sub statement_lines {
	my ($stmt) = @_;

	# Strip the diff line prefixes and rip blank lines at start and end.
	$stmt =~ s/(^|\n)./$1/g;
	$stmt =~ s/^\s*//;
	$stmt =~ s/\s*$//;

	my @stmt_lines = ($stmt =~ /\n/g);

	return $#stmt_lines + 2;
}

sub statement_rawlines {
	my ($stmt) = @_;

	my @stmt_lines = ($stmt =~ /\n/g);

	return $#stmt_lines + 2;
}

sub statement_block_size {
	my ($stmt) = @_;

	$stmt =~ s/(^|\n)./$1/g;
	$stmt =~ s/^\s*{//;
	$stmt =~ s/}\s*$//;
	$stmt =~ s/^\s*//;
	$stmt =~ s/\s*$//;

	my @stmt_lines = ($stmt =~ /\n/g);
	my @stmt_statements = ($stmt =~ /;/g);

	my $stmt_lines = $#stmt_lines + 2;
	my $stmt_statements = $#stmt_statements + 1;

	if ($stmt_lines > $stmt_statements) {
		return $stmt_lines;
	} else {
		return $stmt_statements;
	}
}

sub ctx_statement_full {
	my ($linenr, $remain, $off) = @_;
	my ($statement, $condition, $level);

	my (@chunks);

	# Grab the first conditional/block pair.
	($statement, $condition, $linenr, $remain, $off, $level) =
				ctx_statement_block($linenr, $remain, $off);
	#print "F: c<$condition> s<$statement> remain<$remain>\n";
	push(@chunks, [ $condition, $statement ]);
	if (!($remain > 0 && $condition =~ /^\s*(?:\n[+-])?\s*(?:if|else|do)\b/s)) {
		return ($level, $linenr, @chunks);
	}

	# Pull in the following conditional/block pairs and see if they
	# could continue the statement.
	for (;;) {
		($statement, $condition, $linenr, $remain, $off, $level) =
				ctx_statement_block($linenr, $remain, $off);
		#print "C: c<$condition> s<$statement> remain<$remain>\n";
		last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
		#print "C: push\n";
		push(@chunks, [ $condition, $statement ]);
	}

	return ($level, $linenr, @chunks);
}

sub ctx_block_get {
	my ($linenr, $remain, $outer, $open, $close, $off) = @_;
	my $line;
	my $start = $linenr - 1;
	my $blk = '';
	my @o;
	my @c;
	my @res = ();

	my $level = 0;
	my @stack = ($level);
	for ($line = $start; $remain > 0; $line++) {
		next if ($rawlines[$line] =~ /^-/);
		$remain--;

		$blk .= $rawlines[$line];

		# Handle nested #if/#else.
		if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
			push(@stack, $level);
		} elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
			$level = $stack[$#stack - 1];
		} elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
			$level = pop(@stack);
		}

		foreach my $c (split(//, $lines[$line])) {
			##print "C<$c>L<$level><$open$close>O<$off>\n";
			if ($off > 0) {
				$off--;
				next;
			}

			if ($c eq $close && $level > 0) {
				$level--;
				last if ($level == 0);
			} elsif ($c eq $open) {
				$level++;
			}
		}

		if (!$outer || $level <= 1) {
			push(@res, $rawlines[$line]);
		}

		last if ($level == 0);
	}

	return ($level, @res);
}
sub ctx_block_outer {
	my ($linenr, $remain) = @_;

	my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
	return @r;
}
sub ctx_block {
	my ($linenr, $remain) = @_;

	my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
	return @r;
}
sub ctx_statement {
	my ($linenr, $remain, $off) = @_;

	my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
	return @r;
}
sub ctx_block_level {
	my ($linenr, $remain) = @_;

	return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
}
sub ctx_statement_level {
	my ($linenr, $remain, $off) = @_;

	return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
}

sub ctx_locate_comment {
	my ($first_line, $end_line) = @_;

	# Catch a comment on the end of the line itself.
	my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
	return $current_comment if (defined $current_comment);

	# Look through the context and try and figure out if there is a
	# comment.
	my $in_comment = 0;
	$current_comment = '';
	for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
		my $line = $rawlines[$linenr - 1];
		#warn "           $line\n";
		if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
			$in_comment = 1;
		}
		if ($line =~ m@/\*@) {
			$in_comment = 1;
		}
		if (!$in_comment && $current_comment ne '') {
			$current_comment = '';
		}
		$current_comment .= $line . "\n" if ($in_comment);
		if ($line =~ m@\*/@) {
			$in_comment = 0;
		}
	}

	chomp($current_comment);
	return($current_comment);
}
sub ctx_has_comment {
	my ($first_line, $end_line) = @_;
	my $cmt = ctx_locate_comment($first_line, $end_line);

	##print "LINE: $rawlines[$end_line - 1 ]\n";
	##print "CMMT: $cmt\n";

	return ($cmt ne '');
}

sub raw_line {
	my ($linenr, $cnt) = @_;

	my $offset = $linenr - 1;
	$cnt++;

	my $line;
	while ($cnt) {
		$line = $rawlines[$offset++];
		next if (defined($line) && $line =~ /^-/);
		$cnt--;
	}

	return $line;
}

sub cat_vet {
	my ($vet) = @_;
	my ($res, $coded);

	$res = '';
	while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
		$res .= $1;
		if ($2 ne '') {
			$coded = sprintf("^%c", unpack('C', $2) + 64);
			$res .= $coded;
		}
	}
	$res =~ s/$/\$/;

	return $res;
}

my $av_preprocessor = 0;
my $av_pending;
my @av_paren_type;
my $av_pend_colon;

sub annotate_reset {
	$av_preprocessor = 0;
	$av_pending = '_';
	@av_paren_type = ('E');
	$av_pend_colon = 'O';
}

sub annotate_values {
	my ($stream, $type) = @_;

	my $res;
	my $var = '_' x length($stream);
	my $cur = $stream;

	print "$stream\n" if ($dbg_values > 1);

	while (length($cur)) {
		@av_paren_type = ('E') if ($#av_paren_type < 0);
		print " <" . join('', @av_paren_type) .
				"> <$type> <$av_pending>" if ($dbg_values > 1);
		if ($cur =~ /^(\s+)/o) {
			print "WS($1)\n" if ($dbg_values > 1);
			if ($1 =~ /\n/ && $av_preprocessor) {
				$type = pop(@av_paren_type);
				$av_preprocessor = 0;
			}

		} elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
			print "CAST($1)\n" if ($dbg_values > 1);
			push(@av_paren_type, $type);
			$type = 'c';

		} elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
			print "DECLARE($1)\n" if ($dbg_values > 1);
			$type = 'T';

		} elsif ($cur =~ /^($Modifier)\s*/) {
			print "MODIFIER($1)\n" if ($dbg_values > 1);
			$type = 'T';

		} elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
			print "DEFINE($1,$2)\n" if ($dbg_values > 1);
			$av_preprocessor = 1;
			push(@av_paren_type, $type);
			if ($2 ne '') {
				$av_pending = 'N';
			}
			$type = 'E';

		} elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
			print "UNDEF($1)\n" if ($dbg_values > 1);
			$av_preprocessor = 1;
			push(@av_paren_type, $type);

		} elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
			print "PRE_START($1)\n" if ($dbg_values > 1);
			$av_preprocessor = 1;

			push(@av_paren_type, $type);
			push(@av_paren_type, $type);
			$type = 'E';

		} elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
			print "PRE_RESTART($1)\n" if ($dbg_values > 1);
			$av_preprocessor = 1;

			push(@av_paren_type, $av_paren_type[$#av_paren_type]);

			$type = 'E';

		} elsif ($cur =~ /^(\#\s*(?:endif))/o) {
			print "PRE_END($1)\n" if ($dbg_values > 1);

			$av_preprocessor = 1;

			# Assume all arms of the conditional end as this
			# one does, and continue as if the #endif was not here.
			pop(@av_paren_type);
			push(@av_paren_type, $type);
			$type = 'E';

		} elsif ($cur =~ /^(\\\n)/o) {
			print "PRECONT($1)\n" if ($dbg_values > 1);

		} elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
			print "ATTR($1)\n" if ($dbg_values > 1);
			$av_pending = $type;
			$type = 'N';

		} elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
			print "SIZEOF($1)\n" if ($dbg_values > 1);
			if (defined $2) {
				$av_pending = 'V';
			}
			$type = 'N';

		} elsif ($cur =~ /^(if|while|for)\b/o) {
			print "COND($1)\n" if ($dbg_values > 1);
			$av_pending = 'E';
			$type = 'N';

		} elsif ($cur =~/^(case)/o) {
			print "CASE($1)\n" if ($dbg_values > 1);
			$av_pend_colon = 'C';
			$type = 'N';

		} elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
			print "KEYWORD($1)\n" if ($dbg_values > 1);
			$type = 'N';

		} elsif ($cur =~ /^(\()/o) {
			print "PAREN('$1')\n" if ($dbg_values > 1);
			push(@av_paren_type, $av_pending);
			$av_pending = '_';
			$type = 'N';

		} elsif ($cur =~ /^(\))/o) {
			my $new_type = pop(@av_paren_type);
			if ($new_type ne '_') {
				$type = $new_type;
				print "PAREN('$1') -> $type\n"
							if ($dbg_values > 1);
			} else {
				print "PAREN('$1')\n" if ($dbg_values > 1);
			}

		} elsif ($cur =~ /^($Ident)\s*\(/o) {
			print "FUNC($1)\n" if ($dbg_values > 1);
			$type = 'V';
			$av_pending = 'V';

		} elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
			if (defined $2 && $type eq 'C' || $type eq 'T') {
				$av_pend_colon = 'B';
			} elsif ($type eq 'E') {
				$av_pend_colon = 'L';
			}
			print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
			$type = 'V';

		} elsif ($cur =~ /^($Ident|$Constant)/o) {
			print "IDENT($1)\n" if ($dbg_values > 1);
			$type = 'V';

		} elsif ($cur =~ /^($Assignment)/o) {
			print "ASSIGN($1)\n" if ($dbg_values > 1);
			$type = 'N';

		} elsif ($cur =~/^(;|{|})/) {
			print "END($1)\n" if ($dbg_values > 1);
			$type = 'E';
			$av_pend_colon = 'O';

		} elsif ($cur =~/^(,)/) {
			print "COMMA($1)\n" if ($dbg_values > 1);
			$type = 'C';

		} elsif ($cur =~ /^(\?)/o) {
			print "QUESTION($1)\n" if ($dbg_values > 1);
			$type = 'N';

		} elsif ($cur =~ /^(:)/o) {
			print "COLON($1,$av_pend_colon)\n" if ($dbg_values > 1);

			substr($var, length($res), 1, $av_pend_colon);
			if ($av_pend_colon eq 'C' || $av_pend_colon eq 'L') {
				$type = 'E';
			} else {
				$type = 'N';
			}
			$av_pend_colon = 'O';

		} elsif ($cur =~ /^(\[)/o) {
			print "CLOSE($1)\n" if ($dbg_values > 1);
			$type = 'N';

		} elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
			my $variant;

			print "OPV($1)\n" if ($dbg_values > 1);
			if ($type eq 'V') {
				$variant = 'B';
			} else {
				$variant = 'U';
			}

			substr($var, length($res), 1, $variant);
			$type = 'N';

		} elsif ($cur =~ /^($Operators)/o) {
			print "OP($1)\n" if ($dbg_values > 1);
			if ($1 ne '++' && $1 ne '--') {
				$type = 'N';
			}

		} elsif ($cur =~ /(^.)/o) {
			print "C($1)\n" if ($dbg_values > 1);
		}
		if (defined $1) {
			$cur = substr($cur, length($1));
			$res .= $type x length($1);
		}
	}

	return ($res, $var);
}

sub possible {
	my ($possible, $line) = @_;
	my $notPermitted = qr{(?:
		^(?:
			$Modifier|
			$Storage|
			$Type|
			DEFINE_\S+
		)$|
		^(?:
			goto|
			return|
			case|
			else|
			asm|__asm__|
			do|
			\#|
			\#\#|
		)(?:\s|$)|
		^(?:typedef|struct|enum)\b
	    )}x;
	warn "CHECK<$possible> ($line)\n" if ($dbg_possible > 2);
	if ($possible !~ $notPermitted) {
		# Check for modifiers.
		$possible =~ s/\s*$Storage\s*//g;
		$possible =~ s/\s*$Sparse\s*//g;
		if ($possible =~ /^\s*$/) {

		} elsif ($possible =~ /\s/) {
			$possible =~ s/\s*$Type\s*//g;
			for my $modifier (split(' ', $possible)) {
				if ($modifier !~ $notPermitted) {
					warn "MODIFIER: $modifier ($possible) ($line)\n" if ($dbg_possible);
					push(@modifierListFile, $modifier);
				}
			}

		} else {
			warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible);
			push(@typeListFile, $possible);
		}
		build_types();
	} else {
		warn "NOTPOSS: $possible ($line)\n" if ($dbg_possible > 1);
	}
}

my $prefix = '';

sub show_type {
	my ($type) = @_;

	$type =~ tr/[a-z]/[A-Z]/;

	return defined $use_type{$type} if (scalar keys %use_type > 0);

	return !defined $ignore_type{$type};
}

sub report {
	my ($level, $type, $msg) = @_;

	if (!show_type($type) ||
	    (defined $tst_only && $msg !~ /\Q$tst_only\E/)) {
		return 0;
	}
	my $output = '';
	if ($color) {
		if ($level eq 'ERROR') {
			$output .= RED;
		} elsif ($level eq 'WARNING') {
			$output .= YELLOW;
		} else {
			$output .= GREEN;
		}
	}
	$output .= $prefix . $level . ':';
	if ($show_types) {
		$output .= BLUE if ($color);
		$output .= "$type:";
	}
	$output .= RESET if ($color);
	$output .= ' ' . $msg . "\n";

	if ($showfile) {
		my @lines = split("\n", $output, -1);
		splice(@lines, 1, 1);
		$output = join("\n", @lines);
	}
	$output = (split('\n', $output))[0] . "\n" if ($terse);

	push(our @report, $output);

	return 1;
}

sub report_dump {
	our @report;
}

sub fixup_current_range {
	my ($lineRef, $offset, $length) = @_;

	if ($$lineRef =~ /^\@\@ -\d+,\d+ \+(\d+),(\d+) \@\@/) {
		my $o = $1;
		my $l = $2;
		my $no = $o + $offset;
		my $nl = $l + $length;
		$$lineRef =~ s/\+$o,$l \@\@/\+$no,$nl \@\@/;
	}
}

sub fix_inserted_deleted_lines {
	my ($linesRef, $insertedRef, $deletedRef) = @_;

	my $range_last_linenr = 0;
	my $delta_offset = 0;

	my $old_linenr = 0;
	my $new_linenr = 0;

	my $next_insert = 0;
	my $next_delete = 0;

	my @lines = ();

	my $inserted = @{$insertedRef}[$next_insert++];
	my $deleted = @{$deletedRef}[$next_delete++];

	foreach my $old_line (@{$linesRef}) {
		my $save_line = 1;
		my $line = $old_line;	#don't modify the array
		if ($line =~ /^(?:\+\+\+|\-\-\-)\s+\S+/) {	#new filename
			$delta_offset = 0;
		} elsif ($line =~ /^\@\@ -\d+,\d+ \+\d+,\d+ \@\@/) {	#new hunk
			$range_last_linenr = $new_linenr;
			fixup_current_range(\$line, $delta_offset, 0);
		}

		while (defined($deleted) && ${$deleted}{'LINENR'} == $old_linenr) {
			$deleted = @{$deletedRef}[$next_delete++];
			$save_line = 0;
			fixup_current_range(\$lines[$range_last_linenr], $delta_offset--, -1);
		}

		while (defined($inserted) && ${$inserted}{'LINENR'} == $old_linenr) {
			push(@lines, ${$inserted}{'LINE'});
			$inserted = @{$insertedRef}[$next_insert++];
			$new_linenr++;
			fixup_current_range(\$lines[$range_last_linenr], $delta_offset++, 1);
		}

		if ($save_line) {
			push(@lines, $line);
			$new_linenr++;
		}

		$old_linenr++;
	}

	return @lines;
}

sub fix_insert_line {
	my ($linenr, $line) = @_;

	my $inserted = {
		LINENR => $linenr,
		LINE => $line,
	};
	push(@fixed_inserted, $inserted);
}

sub fix_delete_line {
	my ($linenr, $line) = @_;

	my $deleted = {
		LINENR => $linenr,
		LINE => $line,
	};

	push(@fixed_deleted, $deleted);
}

sub ERROR {
	my ($type, $msg) = @_;

	if (report("ERROR", $type, $msg)) {
		our $clean = 0;
		our $cnt_error++;
		return 1;
	}
	return 0;
}
sub WARN {
	my ($type, $msg) = @_;

	if (report("WARNING", $type, $msg)) {
		our $clean = 0;
		our $cnt_warn++;
		return 1;
	}
	return 0;
}
sub CHK {
	my ($type, $msg) = @_;

	if ($check && report("CHECK", $type, $msg)) {
		our $clean = 0;
		our $cnt_chk++;
		return 1;
	}
	return 0;
}

sub check_absolute_file {
	my ($absolute, $herecurr) = @_;
	my $file = $absolute;

	##print "absolute<$absolute>\n";

	# See if any suffix of this path is a path within the tree.
	while ($file =~ s@^[^/]*/@@) {
		if (-f "$root/$file") {
			##print "file<$file>\n";
			last;
		}
	}
	if (! -f _)  {
		return 0;
	}

	# It is, so see if the prefix is acceptable.
	my $prefix = $absolute;
	substr($prefix, -length($file)) = '';

	##print "prefix<$prefix>\n";
	if ($prefix ne ".../") {
		WARN("USE_RELATIVE_PATH",
		     "use relative pathname instead of absolute in changelog text\n" . $herecurr);
	}
}

sub trim {
	my ($string) = @_;

	$string =~ s/^\s+|\s+$//g;

	return $string;
}

sub ltrim {
	my ($string) = @_;

	$string =~ s/^\s+//;

	return $string;
}

sub rtrim {
	my ($string) = @_;

	$string =~ s/\s+$//;

	return $string;
}

sub string_find_replace {
	my ($string, $find, $replace) = @_;

	$string =~ s/$find/$replace/g;

	return $string;
}

sub tabify {
	my ($leading) = @_;

	my $source_indent = 8;
	my $max_spaces_before_tab = $source_indent - 1;
	my $spaces_to_tab = " " x $source_indent;

	#convert leading spaces to tabs
	1 while $leading =~ s@^([\t]*)$spaces_to_tab@$1\t@g;
	#Remove spaces before a tab
	1 while $leading =~ s@^([\t]*)( {1,$max_spaces_before_tab})\t@$1\t@g;

	return "$leading";
}

sub pos_last_openparen {
	my ($line) = @_;

	my $pos = 0;

	my $opens = $line =~ tr/\(/\(/;
	my $closes = $line =~ tr/\)/\)/;

	my $last_openparen = 0;

	if (($opens == 0) || ($closes >= $opens)) {
		return -1;
	}

	my $len = length($line);

	for ($pos = 0; $pos < $len; $pos++) {
		my $string = substr($line, $pos);
		if ($string =~ /^($FuncArg|$balanced_parens)/) {
			$pos += length($1) - 1;
		} elsif (substr($line, $pos, 1) eq '(') {
			$last_openparen = $pos;
		} elsif (index($string, '(') == -1) {
			last;
		}
	}

	return length(expand_tabs(substr($line, 0, $last_openparen))) + 1;
}

sub remove_defuns {
	my @breakfast = ();
	my $milktoast;
	for my $tasty (@rawlines) {
		$milktoast = $tasty;
		if (($tasty =~ /^\+DEFPY/ ||
		     $tasty =~ /^\+DEFUN/ ||
		     $tasty =~ /^\+ALIAS/) .. ($tasty =~ /^\+\{/)) {
			$milktoast = "\n";
		}
		push(@breakfast, $milktoast);
	}
	@rawlines = @breakfast;
}

sub process {
	my $filename = shift;

	my $linenr=0;
	my $prevline="";
	my $prevrawline="";
	my $stashline="";
	my $stashrawline="";

	my $length;
	my $indent;
	my $previndent=0;
	my $stashindent=0;

	our $clean = 1;
	my $signoff = 0;
	my $is_patch = 0;
	my $in_header_lines = $file ? 0 : 1;
	my $in_commit_log = 0;		#Scanning lines before patch
	my $has_commit_log = 0;		#Encountered lines before patch
	my $commit_log_possible_stack_dump = 0;
	my $commit_log_long_line = 0;
	my $commit_log_has_diff = 0;
	my $reported_maintainer_file = 0;
	my $non_utf8_charset = 0;

	my $last_blank_line = 0;
	my $last_coalesced_string_linenr = -1;

	our @report = ();
	our $cnt_lines = 0;
	our $cnt_error = 0;
	our $cnt_warn = 0;
	our $cnt_chk = 0;

	# Trace the real file/line as we go.
	my $realfile = '';
	my $realline = 0;
	my $realcnt = 0;
	my $here = '';
	my $context_function;		#undef'd unless there's a known function
	my $in_comment = 0;
	my $comment_edge = 0;
	my $first_line = 0;
	my $p1_prefix = '';

	my $prev_values = 'E';

	# suppression flags
	my %suppress_ifbraces;
	my %suppress_whiletrailers;
	my %suppress_export;
	my $suppress_statement = 0;

	my %signatures = ();

	# Pre-scan the patch sanitizing the lines.
	# Pre-scan the patch looking for any __setup documentation.
	#
	my @setup_docs = ();
	my $setup_docs = 0;

	my $camelcase_file_seeded = 0;

	sanitise_line_reset();
	remove_defuns();

	my $line;
	foreach my $rawline (@rawlines) {
		$linenr++;
		$line = $rawline;

		push(@fixed, $rawline) if ($fix);

		if ($rawline=~/^\+\+\+\s+(\S+)/) {
			$setup_docs = 0;
			if ($1 =~ m@Documentation/admin-guide/kernel-parameters.rst$@) {
				$setup_docs = 1;
			}
			#next;
		}
		if ($rawline =~ /^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
			$realline=$1-1;
			if (defined $2) {
				$realcnt=$3+1;
			} else {
				$realcnt=1+1;
			}
			$in_comment = 0;

			# Guestimate if this is a continuing comment.  Run
			# the context looking for a comment "edge".  If this
			# edge is a close comment then we must be in a comment
			# at context start.
			my $edge;
			my $cnt = $realcnt;
			for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
				next if (defined $rawlines[$ln - 1] &&
					 $rawlines[$ln - 1] =~ /^-/);
				$cnt--;
				#print "RAW<$rawlines[$ln - 1]>\n";
				last if (!defined $rawlines[$ln - 1]);
				if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
				    $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
					($edge) = $1;
					last;
				}
			}
			if (defined $edge && $edge eq '*/') {
				$in_comment = 1;
			}

			# Guestimate if this is a continuing comment.  If this
			# is the start of a diff block and this line starts
			# ' *' then it is very likely a comment.
			if (!defined $edge &&
			    $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
			{
				$in_comment = 1;
			}

			##print "COMMENT:$in_comment edge<$edge> $rawline\n";
			sanitise_line_reset($in_comment);

		} elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
			# Standardise the strings and chars within the input to
			# simplify matching -- only bother with positive lines.
			$line = sanitise_line($rawline);
		}
		push(@lines, $line);

		if ($realcnt > 1) {
			$realcnt-- if ($line =~ /^(?:\+| |$)/);
		} else {
			$realcnt = 0;
		}

		#print "==>$rawline\n";
		#print "-->$line\n";

		if ($setup_docs && $line =~ /^\+/) {
			push(@setup_docs, $line);
		}
	}

	$prefix = '';

	$realcnt = 0;
	$linenr = 0;
	$fixlinenr = -1;
	foreach my $line (@lines) {
		$linenr++;
		$fixlinenr++;
		my $sline = $line;	#copy of $line
		$sline =~ s/$;/ /g;	#with comments as spaces

		my $rawline = $rawlines[$linenr - 1];

#extract the line range in the file after the patch is applied
		if (!$in_commit_log &&
		    $line =~ /^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@(.*)/) {
			my $context = $4;
			$is_patch = 1;
			$first_line = $linenr + 1;
			$realline=$1-1;
			if (defined $2) {
				$realcnt=$3+1;
			} else {
				$realcnt=1+1;
			}
			annotate_reset();
			$prev_values = 'E';

			%suppress_ifbraces = ();
			%suppress_whiletrailers = ();
			%suppress_export = ();
			$suppress_statement = 0;
			if ($context =~ /\b(\w+)\s*\(/) {
				$context_function = $1;
			} else {
				undef $context_function;
			}
			next;

# track the line number as we move through the hunk, note that
# new versions of GNU diff omit the leading space on completely
# blank context lines so we need to count that too.
		} elsif ($line =~ /^( |\+|$)/) {
			$realline++;
			$realcnt-- if ($realcnt != 0);

			# Measure the line length and indent.
			($length, $indent) = line_stats($rawline);

			# Track the previous line.
			($prevline, $stashline) = ($stashline, $line);
			($previndent, $stashindent) = ($stashindent, $indent);
			($prevrawline, $stashrawline) = ($stashrawline, $rawline);

			#warn "line<$line>\n";

		} elsif ($realcnt == 1) {
			$realcnt--;
		}

		my $hunk_line = ($realcnt != 0);

		$here = "#$linenr: " if (!$file);
		$here = "#$realline: " if ($file);

		my $found_file = 0;
		# extract the filename as it passes
		if ($line =~ /^diff --git.*?(\S+)$/) {
			$realfile = $1;
			$realfile =~ s@^([^/]*)/@@ if (!$file);
			$in_commit_log = 0;
			$found_file = 1;
		} elsif ($line =~ /^\+\+\+\s+(\S+)/) {
			$realfile = $1;
			$realfile =~ s@^([^/]*)/@@ if (!$file);
			$in_commit_log = 0;

			$p1_prefix = $1;
			if (!$file && $tree && $p1_prefix ne '' &&
			    -e "$root/$p1_prefix") {
				WARN("PATCH_PREFIX",
				     "patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
			}

			if ($realfile =~ m@^include/asm/@) {
				ERROR("MODIFIED_INCLUDE_ASM",
				      "do not modify files in include/asm, change architecture specific files in include/asm-<architecture>\n" . "$here$rawline\n");
			}
			$found_file = 1;
		}

#make up the handle for any error we report on this line
		if ($showfile) {
			$prefix = "$realfile:$realline: "
		} elsif ($emacs) {
			if ($file) {
				$prefix = "$filename:$realline: ";
			} else {
				$prefix = "$filename:$linenr: ";
			}
		}

		if ($found_file) {
			if (is_maintained_obsolete($realfile)) {
				WARN("OBSOLETE",
				     "$realfile is marked as 'obsolete' in the MAINTAINERS hierarchy.  No unnecessary modifications please.\n");
			}
			if ($realfile =~ m@^(?:drivers/net/|net/|drivers/staging/)@) {
				$check = 1;
			} else {
				$check = $check_orig;
			}
			next;
		}

		$here .= "FILE: $realfile:$realline:" if ($realcnt != 0);

		my $hereline = "$here\n$rawline\n";
		my $herecurr = "$here\n$rawline\n";
		my $hereprev = "$here\n$prevrawline\n$rawline\n";

		$cnt_lines++ if ($realcnt != 0);

# Check if the commit log has what seems like a diff which can confuse patch
		if ($in_commit_log && !$commit_log_has_diff &&
		    (($line =~ m@^\s+diff\b.*a/[\w/]+@ &&
		      $line =~ m@^\s+diff\b.*a/([\w/]+)\s+b/$1\b@) ||
		     $line =~ m@^\s*(?:\-\-\-\s+a/|\+\+\+\s+b/)@ ||
		     $line =~ m/^\s*\@\@ \-\d+,\d+ \+\d+,\d+ \@\@/)) {
			ERROR("DIFF_IN_COMMIT_MSG",
			      "Avoid using diff content in the commit message - patch(1) might not work\n" . $herecurr);
			$commit_log_has_diff = 1;
		}

# Check for incorrect file permissions
		if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
			my $permhere = $here . "FILE: $realfile\n";
			if ($realfile !~ m@scripts/@ &&
			    $realfile !~ /\.(py|pl|awk|sh)$/) {
				ERROR("EXECUTE_PERMISSIONS",
				      "do not set execute permissions for source files\n" . $permhere);
			}
		}

# Check the patch for a signoff:
		if ($line =~ /^\s*signed-off-by:/i) {
			$signoff++;
			$in_commit_log = 0;
		}

# Check if MAINTAINERS is being updated.  If so, there's probably no need to
# emit the "does MAINTAINERS need updating?" message on file add/move/delete
		if ($line =~ /^\s*MAINTAINERS\s*\|/) {
			$reported_maintainer_file = 1;
		}

# Check signature styles
		if (!$in_header_lines &&
		    $line =~ /^(\s*)([a-z0-9_-]+by:|$signature_tags)(\s*)(.*)/i) {
			my $space_before = $1;
			my $sign_off = $2;
			my $space_after = $3;
			my $email = $4;
			my $ucfirst_sign_off = ucfirst(lc($sign_off));

			if ($sign_off !~ /$signature_tags/) {
				WARN("BAD_SIGN_OFF",
				     "Non-standard signature: $sign_off\n" . $herecurr);
			}
			if (defined $space_before && $space_before ne "") {
				if (WARN("BAD_SIGN_OFF",
					 "Do not use whitespace before $ucfirst_sign_off\n" . $herecurr) &&
				    $fix) {
					$fixed[$fixlinenr] =
					    "$ucfirst_sign_off $email";
				}
			}
			if ($sign_off =~ /-by:$/i && $sign_off ne $ucfirst_sign_off) {
				if (WARN("BAD_SIGN_OFF",
					 "'$ucfirst_sign_off' is the preferred signature form\n" . $herecurr) &&
				    $fix) {
					$fixed[$fixlinenr] =
					    "$ucfirst_sign_off $email";
				}

			}
			if (!defined $space_after || $space_after ne " ") {
				if (WARN("BAD_SIGN_OFF",
					 "Use a single space after $ucfirst_sign_off\n" . $herecurr) &&
				    $fix) {
					$fixed[$fixlinenr] =
					    "$ucfirst_sign_off $email";
				}
			}

			my ($email_name, $email_address, $comment) = parse_email($email);
			my $suggested_email = format_email(($email_name, $email_address));
			if ($suggested_email eq "") {
				ERROR("BAD_SIGN_OFF",
				      "Unrecognized email address: '$email'\n" . $herecurr);
			} else {
				my $dequoted = $suggested_email;
				$dequoted =~ s/^"//;
				$dequoted =~ s/" </ </;
				# Don't force email to have quotes
				# Allow just an angle bracketed address
				if ("$dequoted$comment" ne $email &&
				    "<$email_address>$comment" ne $email &&
				    "$suggested_email$comment" ne $email) {
					WARN("BAD_SIGN_OFF",
					     "email address '$email' might be better as '$suggested_email$comment'\n" . $herecurr);
				}
			}

# Check for duplicate signatures
			my $sig_nospace = $line;
			$sig_nospace =~ s/\s//g;
			$sig_nospace = lc($sig_nospace);
			if (defined $signatures{$sig_nospace}) {
				WARN("BAD_SIGN_OFF",
				     "Duplicate signature\n" . $herecurr);
			} else {
				$signatures{$sig_nospace} = 1;
			}
		}

# Check email subject for common tools that don't need to be mentioned
		if ($in_header_lines &&
		    $line =~ /^Subject:.*\b(?:checkpatch|sparse|smatch)\b[^:]/i) {
			WARN("EMAIL_SUBJECT",
			     "A patch subject line should describe the change not the tool that found it\n" . $herecurr);
		}

# Check for old stable address
		if ($line =~ /^\s*cc:\s*.*<?\bstable\@kernel\.org\b>?.*$/i) {
			ERROR("STABLE_ADDRESS",
			      "The 'stable' address should be 'stable\@vger.kernel.org'\n" . $herecurr);
		}

# Check for unwanted Gerrit info
		if ($in_commit_log && $line =~ /^\s*change-id:/i) {
			ERROR("GERRIT_CHANGE_ID",
			      "Remove Gerrit Change-Id's before submitting upstream.\n" . $herecurr);
		}

# Check if the commit log is in a possible stack dump
		if ($in_commit_log && !$commit_log_possible_stack_dump &&
		    ($line =~ /^\s*(?:WARNING:|BUG:)/ ||
		     $line =~ /^\s*\[\s*\d+\.\d{6,6}\s*\]/ ||
					# timestamp
		     $line =~ /^\s*\[\<[0-9a-fA-F]{8,}\>\]/)) {
					# stack dump address
			$commit_log_possible_stack_dump = 1;
		}

# Check for line lengths > 75 in commit log, warn once
		if ($in_commit_log && !$commit_log_long_line &&
		    length($line) > 75 &&
		    !($line =~ /^\s*[a-zA-Z0-9_\/\.]+\s+\|\s+\d+/ ||
					# file delta changes
		      $line =~ /^\s*(?:[\w\.\-]+\/)++[\w\.\-]+:/ ||
					# filename then :
		      $line =~ /^\s*(?:Fixes:|Link:)/i ||
					# A Fixes: or Link: line
		      $commit_log_possible_stack_dump)) {
			WARN("COMMIT_LOG_LONG_LINE",
			     "Possible unwrapped commit description (prefer a maximum 75 chars per line)\n" . $herecurr);
			$commit_log_long_line = 1;
		}

# Reset possible stack dump if a blank line is found
		if ($in_commit_log && $commit_log_possible_stack_dump &&
		    $line =~ /^\s*$/) {
			$commit_log_possible_stack_dump = 0;
		}

# Check for git id commit length and improperly formed commit descriptions
		if ($in_commit_log && !$commit_log_possible_stack_dump &&
		    $line !~ /^\s*(?:Link|Patchwork|http|https|BugLink):/i &&
		    $line !~ /^This reverts commit [0-9a-f]{7,40}/ &&
		    ($line =~ /\bcommit\s+[0-9a-f]{5,}\b/i ||
		     ($line =~ /(?:\s|^)[0-9a-f]{12,40}(?:[\s"'\(\[]|$)/i &&
		      $line !~ /[\<\[][0-9a-f]{12,40}[\>\]]/i &&
		      $line !~ /\bfixes:\s*[0-9a-f]{12,40}/i))) {
			my $init_char = "c";
			my $orig_commit = "";
			my $short = 1;
			my $long = 0;
			my $case = 1;
			my $space = 1;
			my $hasdesc = 0;
			my $hasparens = 0;
			my $id = '0123456789ab';
			my $orig_desc = "commit description";
			my $description = "";

			if ($line =~ /\b(c)ommit\s+([0-9a-f]{5,})\b/i) {
				$init_char = $1;
				$orig_commit = lc($2);
			} elsif ($line =~ /\b([0-9a-f]{12,40})\b/i) {
				$orig_commit = lc($1);
			}

			$short = 0 if ($line =~ /\bcommit\s+[0-9a-f]{12,40}/i);
			$long = 1 if ($line =~ /\bcommit\s+[0-9a-f]{41,}/i);
			$space = 0 if ($line =~ /\bcommit [0-9a-f]/i);
			$case = 0 if ($line =~ /\b[Cc]ommit\s+[0-9a-f]{5,40}[^A-F]/);
			if ($line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("([^"]+)"\)/i) {
				$orig_desc = $1;
				$hasparens = 1;
			} elsif ($line =~ /\bcommit\s+[0-9a-f]{5,}\s*$/i &&
				 defined $rawlines[$linenr] &&
				 $rawlines[$linenr] =~ /^\s*\("([^"]+)"\)/) {
				$orig_desc = $1;
				$hasparens = 1;
			} elsif ($line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("[^"]+$/i &&
				 defined $rawlines[$linenr] &&
				 $rawlines[$linenr] =~ /^\s*[^"]+"\)/) {
				$line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("([^"]+)$/i;
				$orig_desc = $1;
				$rawlines[$linenr] =~ /^\s*([^"]+)"\)/;
				$orig_desc .= " " . $1;
				$hasparens = 1;
			}

			($id, $description) = git_commit_info($orig_commit,
							      $id, $orig_desc);

			if (defined($id) &&
			   ($short || $long || $space || $case || ($orig_desc ne $description) || !$hasparens)) {
				ERROR("GIT_COMMIT_ID",
				      "Please use git commit description style 'commit <12+ chars of sha1> (\"<title line>\")' - ie: '${init_char}ommit $id (\"$description\")'\n" . $herecurr);
			}
		}

# Check for added, moved or deleted files
		if (!$reported_maintainer_file && !$in_commit_log &&
		    ($line =~ /^(?:new|deleted) file mode\s*\d+\s*$/ ||
		     $line =~ /^rename (?:from|to) [\w\/\.\-]+\s*$/ ||
		     ($line =~ /\{\s*([\w\/\.\-]*)\s*\=\>\s*([\w\/\.\-]*)\s*\}/ &&
		      (defined($1) || defined($2))))) {
			$is_patch = 1;
			$reported_maintainer_file = 1;
			#WARN("FILE_PATH_CHANGES",
			#     "added, moved or deleted file(s), does MAINTAINERS need updating?\n" . $herecurr);
		}

# Check for wrappage within a valid hunk of the file
		if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
			ERROR("CORRUPTED_PATCH",
			      "patch seems to be corrupt (line wrapped?)\n" .
				$herecurr) if (!$emitted_corrupt++);
		}

# UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
		if (($realfile =~ /^$/ || $line =~ /^\+/) &&
		    $rawline !~ m/^$UTF8*$/) {
			my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);

			my $blank = copy_spacing($rawline);
			my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
			my $hereptr = "$hereline$ptr\n";

			CHK("INVALID_UTF8",
			    "Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
		}

# Check if it's the start of a commit log
# (not a header line and we haven't seen the patch filename)
		if ($in_header_lines && $realfile =~ /^$/ &&
		    !($rawline =~ /^\s+(?:\S|$)/ ||
		      $rawline =~ /^(?:commit\b|from\b|[\w-]+:)/i)) {
			$in_header_lines = 0;
			$in_commit_log = 1;
			$has_commit_log = 1;
		}

# Check if there is UTF-8 in a commit log when a mail header has explicitly
# declined it, i.e defined some charset where it is missing.
		if ($in_header_lines &&
		    $rawline =~ /^Content-Type:.+charset="(.+)".*$/ &&
		    $1 !~ /utf-8/i) {
			$non_utf8_charset = 1;
		}

		if ($in_commit_log && $non_utf8_charset && $realfile =~ /^$/ &&
		    $rawline =~ /$NON_ASCII_UTF8/) {
			WARN("UTF8_BEFORE_PATCH",
			    "8-bit UTF-8 used in possible commit log\n" . $herecurr);
		}

# Check for absolute kernel paths in commit message
		if ($tree && $in_commit_log) {
			while ($line =~ m{(?:^|\s)(/\S*)}g) {
				my $file = $1;

				if ($file =~ m{^(.*?)(?::\d+)+:?$} &&
				    check_absolute_file($1, $herecurr)) {
					#
				} else {
					check_absolute_file($file, $herecurr);
				}
			}
		}

# Check for various typo / spelling mistakes
		if (defined($misspellings) &&
		    ($in_commit_log || $line =~ /^(?:\+|Subject:)/i)) {
			while ($rawline =~ /(?:^|[^a-z@])($misspellings)(?:\b|$|[^a-z@])/gi) {
				my $typo = $1;
				my $typo_fix = $spelling_fix{lc($typo)};
				$typo_fix = ucfirst($typo_fix) if ($typo =~ /^[A-Z]/);
				$typo_fix = uc($typo_fix) if ($typo =~ /^[A-Z]+$/);
				my $msg_level = \&WARN;
				$msg_level = \&CHK if ($file);
				if (&{$msg_level}("TYPO_SPELLING",
						  "'$typo' may be misspelled - perhaps '$typo_fix'?\n" . $herecurr) &&
				    $fix) {
					$fixed[$fixlinenr] =~ s/(^|[^A-Za-z@])($typo)($|[^A-Za-z@])/$1$typo_fix$3/;
				}
			}
		}

# ignore non-hunk lines and lines being removed
		next if (!$hunk_line || $line =~ /^-/);

#trailing whitespace
		if ($line =~ /^\+.*\015/) {
			my $herevet = "$here\n" . cat_vet($rawline) . "\n";
			if (ERROR("DOS_LINE_ENDINGS",
				  "DOS line endings\n" . $herevet) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/[\s\015]+$//;
			}
		} elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
			my $herevet = "$here\n" . cat_vet($rawline) . "\n";
			if (ERROR("TRAILING_WHITESPACE",
				  "trailing whitespace\n" . $herevet) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/\s+$//;
			}

			$rpt_cleaners = 1;
		}

# check for Kconfig help text having a real description
# Only applies when adding the entry originally, after that we do not have
# sufficient context to determine whether it is indeed long enough.
		if ($realfile =~ /Kconfig/ &&
		    $line =~ /^\+\s*config\s+/) {
			my $length = 0;
			my $cnt = $realcnt;
			my $ln = $linenr + 1;
			my $f;
			my $is_start = 0;
			my $is_end = 0;
			for (; $cnt > 0 && defined $lines[$ln - 1]; $ln++) {
				$f = $lines[$ln - 1];
				$cnt-- if ($lines[$ln - 1] !~ /^-/);
				$is_end = $lines[$ln - 1] =~ /^\+/;

				next if ($f =~ /^-/);
				last if (!$file && $f =~ /^\@\@/);

				if ($lines[$ln - 1] =~ /^\+\s*(?:bool|tristate)\s*\"/) {
					$is_start = 1;
				} elsif ($lines[$ln - 1] =~ /^\+\s*(?:---)?help(?:---)?$/) {
					$length = -1;
				}

				$f =~ s/^.//;
				$f =~ s/#.*//;
				$f =~ s/^\s+//;
				next if ($f =~ /^$/);
				if ($f =~ /^\s*config\s/) {
					$is_end = 1;
					last;
				}
				$length++;
			}
			if ($is_start && $is_end && $length < $min_conf_desc_length) {
				WARN("CONFIG_DESCRIPTION",
				     "please write a paragraph that describes the config symbol fully\n" . $herecurr);
			}
			#print "is_start<$is_start> is_end<$is_end> length<$length>\n";
		}

# check for MAINTAINERS entries that don't have the right form
		if ($realfile =~ /^MAINTAINERS$/ &&
		    $rawline =~ /^\+[A-Z]:/ &&
		    $rawline !~ /^\+[A-Z]:\t\S/) {
			if (WARN("MAINTAINERS_STYLE",
				 "MAINTAINERS entries use one tab after TYPE:\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/^(\+[A-Z]):\s*/$1:\t/;
			}
		}

# discourage the use of boolean for type definition attributes of Kconfig options
		if ($realfile =~ /Kconfig/ &&
		    $line =~ /^\+\s*\bboolean\b/) {
			WARN("CONFIG_TYPE_BOOLEAN",
			     "Use of boolean is deprecated, please use bool instead.\n" . $herecurr);
		}

		if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) &&
		    ($line =~ /\+(EXTRA_[A-Z]+FLAGS).*/)) {
			my $flag = $1;
			my $replacement = {
				'EXTRA_AFLAGS' =>   'asflags-y',
				'EXTRA_CFLAGS' =>   'ccflags-y',
				'EXTRA_CPPFLAGS' => 'cppflags-y',
				'EXTRA_LDFLAGS' =>  'ldflags-y',
			};

			WARN("DEPRECATED_VARIABLE",
			     "Use of $flag is deprecated, please use \`$replacement->{$flag} instead.\n" . $herecurr) if ($replacement->{$flag});
		}

# check for DT compatible documentation
		if (defined $root &&
			(($realfile =~ /\.dtsi?$/ && $line =~ /^\+\s*compatible\s*=\s*\"/) ||
			 ($realfile =~ /\.[ch]$/ && $line =~ /^\+.*\.compatible\s*=\s*\"/))) {

			my @compats = $rawline =~ /\"([a-zA-Z0-9\-\,\.\+_]+)\"/g;

			my $dt_path = $root . "/Documentation/devicetree/bindings/";
			my $vp_file = $dt_path . "vendor-prefixes.txt";

			foreach my $compat (@compats) {
				my $compat2 = $compat;
				$compat2 =~ s/\,[a-zA-Z0-9]*\-/\,<\.\*>\-/;
				my $compat3 = $compat;
				$compat3 =~ s/\,([a-z]*)[0-9]*\-/\,$1<\.\*>\-/;
				`grep -Erq "$compat|$compat2|$compat3" $dt_path`;
				if ( $? >> 8 ) {
					WARN("UNDOCUMENTED_DT_STRING",
					     "DT compatible string \"$compat\" appears un-documented -- check $dt_path\n" . $herecurr);
				}

				next if $compat !~ /^([a-zA-Z0-9\-]+)\,/;
				my $vendor = $1;
				`grep -Eq "^$vendor\\b" $vp_file`;
				if ( $? >> 8 ) {
					WARN("UNDOCUMENTED_DT_STRING",
					     "DT compatible string vendor \"$vendor\" appears un-documented -- check $vp_file\n" . $herecurr);
				}
			}
		}

# check we are in a valid source file if not then ignore this hunk
		next if ($realfile !~ /\.(h|c|s|S|sh|dtsi|dts)$/);

# line length limit (with some exclusions)
#
# There are a few types of lines that may extend beyond $max_line_length:
#	logging functions like pr_info that end in a string
#	lines with a single string
#	#defines that are a single string
#
# There are 3 different line length message types:
# LONG_LINE_COMMENT	a comment starts before but extends beyond $max_line_length
# LONG_LINE_STRING	a string starts before but extends beyond $max_line_length
# LONG_LINE		all other lines longer than $max_line_length
#
# if LONG_LINE is ignored, the other 2 types are also ignored
#

		if ($line =~ /^\+/ && $length > $max_line_length) {
			my $msg_type = "LONG_LINE";

			# Check the allowed long line types first

			# logging functions that end in a string that starts
			# before $max_line_length
			if ($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(?:KERN_\S+\s*|[^"]*))?($String\s*(?:|,|\)\s*;)\s*)$/ &&
			    length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) {
				$msg_type = "";

			# lines with only strings (w/ possible termination)
			# #defines with only strings
			} elsif ($line =~ /^\+\s*$String\s*(?:\s*|,|\)\s*;)\s*$/ ||
				 $line =~ /^\+\s*#\s*define\s+\w+\s+$String$/) {
				$msg_type = "";

			# More special cases
			} elsif ($line =~ /^\+.*\bEFI_GUID\s*\(/ ||
				 $line =~ /^\+\s*(?:\w+)?\s*DEFINE_PER_CPU/) {
				$msg_type = "";

			# Otherwise set the alternate message types

			# a comment starts before $max_line_length
			} elsif ($line =~ /($;[\s$;]*)$/ &&
				 length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) {
				$msg_type = "LONG_LINE_COMMENT"

			# a quoted string starts before $max_line_length
			} elsif ($sline =~ /\s*($String(?:\s*(?:\\|,\s*|\)\s*;\s*))?)$/ &&
				 length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) {
				$msg_type = "LONG_LINE_STRING"
			}

			if ($msg_type ne "" &&
			    (show_type("LONG_LINE") || show_type($msg_type))) {
				WARN($msg_type,
				     "line over $max_line_length characters\n" . $herecurr);
			}
		}

# check for adding lines without a newline.
		if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
			WARN("MISSING_EOF_NEWLINE",
			     "adding a line without newline at end of file\n" . $herecurr);
		}

# Blackfin: use hi/lo macros
		if ($realfile =~ m@arch/blackfin/.*\.S$@) {
			if ($line =~ /\.[lL][[:space:]]*=.*&[[:space:]]*0x[fF][fF][fF][fF]/) {
				my $herevet = "$here\n" . cat_vet($line) . "\n";
				ERROR("LO_MACRO",
				      "use the LO() macro, not (... & 0xFFFF)\n" . $herevet);
			}
			if ($line =~ /\.[hH][[:space:]]*=.*>>[[:space:]]*16/) {
				my $herevet = "$here\n" . cat_vet($line) . "\n";
				ERROR("HI_MACRO",
				      "use the HI() macro, not (... >> 16)\n" . $herevet);
			}
		}

# check we are in a valid source file C or perl if not then ignore this hunk
		next if ($realfile !~ /\.(h|c|pl|dtsi|dts)$/);

# at the beginning of a line any tabs must come first and anything
# more than 8 must use tabs.
		if ($rawline =~ /^\+\s* \t\s*\S/ ||
		    $rawline =~ /^\+\s*        \s*/) {
			my $herevet = "$here\n" . cat_vet($rawline) . "\n";
			$rpt_cleaners = 1;
			if (ERROR("CODE_INDENT",
				  "code indent should use tabs where possible\n" . $herevet) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/^\+([ \t]+)/"\+" . tabify($1)/e;
			}
		}

# check for space before tabs.
		if ($rawline =~ /^\+/ && $rawline =~ / \t/) {
			my $herevet = "$here\n" . cat_vet($rawline) . "\n";
			if (WARN("SPACE_BEFORE_TAB",
				"please, no space before tabs\n" . $herevet) &&
			    $fix) {
				while ($fixed[$fixlinenr] =~
					   s/(^\+.*) {8,8}\t/$1\t\t/) {}
				while ($fixed[$fixlinenr] =~
					   s/(^\+.*) +\t/$1\t/) {}
			}
		}

# check for && or || at the start of a line
		if ($rawline =~ /^\+\s*(&&|\|\|)/) {
			CHK("LOGICAL_CONTINUATIONS",
			    "Logical continuations should be on the previous line\n" . $hereprev);
		}

# check indentation starts on a tab stop
		if ($^V && $^V ge 5.10.0 &&
		    $sline =~ /^\+\t+( +)(?:$c90_Keywords\b|\{\s*$|\}\s*(?:else\b|while\b|\s*$))/) {
			my $indent = length($1);
			if ($indent % 8) {
				if (WARN("TABSTOP",
					 "Statements should start on a tabstop\n" . $herecurr) &&
				    $fix) {
					$fixed[$fixlinenr] =~ s@(^\+\t+) +@$1 . "\t" x ($indent/8)@e;
				}
			}
		}

# check multi-line statement indentation matches previous line
		if ($^V && $^V ge 5.10.0 &&
		    $prevline =~ /^\+([ \t]*)((?:$c90_Keywords(?:\s+if)\s*)|(?:$Declare\s*)?(?:$Ident|\(\s*\*\s*$Ident\s*\))\s*|(?:\*\s*)*$Lval\s*=\s*$Ident\s*)\(.*(\&\&|\|\||,)\s*$/) {
			$prevline =~ /^\+(\t*)(.*)$/;
			my $oldindent = $1;
			my $rest = $2;

			my $pos = pos_last_openparen($rest);
			if ($pos >= 0) {
				$line =~ /^(\+| )([ \t]*)/;
				my $newindent = $2;

				my $goodtabindent = $oldindent .
					"\t" x ($pos / 8) .
					" "  x ($pos % 8);
				my $goodspaceindent = $oldindent . " "  x $pos;

				if ($newindent ne $goodtabindent &&
				    $newindent ne $goodspaceindent) {

					if (CHK("PARENTHESIS_ALIGNMENT",
						"Alignment should match open parenthesis\n" . $hereprev) &&
					    $fix && $line =~ /^\+/) {
						$fixed[$fixlinenr] =~
						    s/^\+[ \t]*/\+$goodtabindent/;
					}
				}
			}
		}

# check for space after cast like "(int) foo" or "(struct foo) bar"
# avoid checking a few false positives:
#   "sizeof(<type>)" or "__alignof__(<type>)"
#   function pointer declarations like "(*foo)(int) = bar;"
#   structure definitions like "(struct foo) { 0 };"
#   multiline macros that define functions
#   known attributes or the __attribute__ keyword
		if ($line =~ /^\+(.*)\(\s*$Type\s*\)([ \t]++)((?![={]|\\$|$Attribute|__attribute__))/ &&
		    (!defined($1) || $1 !~ /\b(?:sizeof|__alignof__)\s*$/)) {
			if (CHK("SPACING",
				"No space is necessary after a cast\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~
				    s/(\(\s*$Type\s*\))[ \t]+/$1/;
			}
		}

# Block comment styles
# Networking with an initial /*
		if ($realfile =~ m@^(drivers/net/|net/)@ &&
		    $prevrawline =~ /^\+[ \t]*\/\*[ \t]*$/ &&
		    $rawline =~ /^\+[ \t]*\*/ &&
		    $realline > 2) {
			WARN("NETWORKING_BLOCK_COMMENT_STYLE",
			     "networking block comments don't use an empty /* line, use /* Comment...\n" . $hereprev);
		}

# Block comments use * on subsequent lines
		if ($prevline =~ /$;[ \t]*$/ &&			#ends in comment
		    $prevrawline =~ /^\+.*?\/\*/ &&		#starting /*
		    $prevrawline !~ /\*\/[ \t]*$/ &&		#no trailing */
		    $rawline =~ /^\+/ &&			#line is new
		    $rawline !~ /^\+[ \t]*\*/) {		#no leading *
			WARN("BLOCK_COMMENT_STYLE",
			     "Block comments use * on subsequent lines\n" . $hereprev);
		}

# Block comments use */ on trailing lines
		if ($rawline !~ m@^\+[ \t]*\*/[ \t]*$@ &&	#trailing */
		    $rawline !~ m@^\+.*/\*.*\*/[ \t]*$@ &&	#inline /*...*/
		    $rawline !~ m@^\+.*\*{2,}/[ \t]*$@ &&	#trailing **/
		    $rawline =~ m@^\+[ \t]*.+\*\/[ \t]*$@) {	#non blank */
			WARN("BLOCK_COMMENT_STYLE",
			     "Block comments use a trailing */ on a separate line\n" . $herecurr);
		}

# Block comment * alignment
		if ($prevline =~ /$;[ \t]*$/ &&			#ends in comment
		    $line =~ /^\+[ \t]*$;/ &&			#leading comment
		    $rawline =~ /^\+[ \t]*\*/ &&		#leading *
		    (($prevrawline =~ /^\+.*?\/\*/ &&		#leading /*
		      $prevrawline !~ /\*\/[ \t]*$/) ||		#no trailing */
		     $prevrawline =~ /^\+[ \t]*\*/)) {		#leading *
			my $oldindent;
			$prevrawline =~ m@^\+([ \t]*/?)\*@;
			if (defined($1)) {
				$oldindent = expand_tabs($1);
			} else {
				$prevrawline =~ m@^\+(.*/?)\*@;
				$oldindent = expand_tabs($1);
			}
			$rawline =~ m@^\+([ \t]*)\*@;
			my $newindent = $1;
			$newindent = expand_tabs($newindent);
			if (length($oldindent) ne length($newindent)) {
				WARN("BLOCK_COMMENT_STYLE",
				     "Block comments should align the * on each line\n" . $hereprev);
			}
		}

# check for missing blank lines after struct/union declarations
# with exceptions for various attributes and macros
		if ($prevline =~ /^[\+ ]};?\s*$/ &&
		    $line =~ /^\+/ &&
		    !($line =~ /^\+\s*$/ ||
		      $line =~ /^\+\s*EXPORT_SYMBOL/ ||
		      $line =~ /^\+\s*MODULE_/i ||
		      $line =~ /^\+\s*\#\s*(?:end|elif|else)/ ||
		      $line =~ /^\+[a-z_]*init/ ||
		      $line =~ /^\+\s*(?:static\s+)?[A-Z_]*ATTR/ ||
		      $line =~ /^\+\s*DECLARE/ ||
		      $line =~ /^\+\s*builtin_[\w_]*driver/ ||
		      $line =~ /^\+\s*__setup/)) {
			if (CHK("LINE_SPACING",
				"Please use a blank line after function/struct/union/enum declarations\n" . $hereprev) &&
			    $fix) {
				fix_insert_line($fixlinenr, "\+");
			}
		}

# check for multiple consecutive blank lines
		if ($prevline =~ /^[\+ ]\s*$/ &&
		    $line =~ /^\+\s*$/ &&
		    $last_blank_line != ($linenr - 1)) {
			if (CHK("LINE_SPACING",
				"Please don't use multiple blank lines\n" . $hereprev) &&
			    $fix) {
				fix_delete_line($fixlinenr, $rawline);
			}

			$last_blank_line = $linenr;
		}

# check for missing blank lines after declarations
		if ($sline =~ /^\+\s+\S/ &&			#Not at char 1
			# actual declarations
		    ($prevline =~ /^\+\s+$Declare\s*$Ident\s*[=,;:\[]/ ||
			# function pointer declarations
		     $prevline =~ /^\+\s+$Declare\s*\(\s*\*\s*$Ident\s*\)\s*[=,;:\[\(]/ ||
			# foo bar; where foo is some local typedef or #define
		     $prevline =~ /^\+\s+$Ident(?:\s+|\s*\*\s*)$Ident\s*[=,;\[]/ ||
			# known declaration macros
		     $prevline =~ /^\+\s+$declaration_macros/) &&
			# for "else if" which can look like "$Ident $Ident"
		    !($prevline =~ /^\+\s+$c90_Keywords\b/ ||
			# other possible extensions of declaration lines
		      $prevline =~ /(?:$Compare|$Assignment|$Operators)\s*$/ ||
			# not starting a section or a macro "\" extended line
		      $prevline =~ /(?:\{\s*|\\)$/) &&
			# looks like a declaration
		    !($sline =~ /^\+\s+$Declare\s*$Ident\s*[=,;:\[]/ ||
			# function pointer declarations
		      $sline =~ /^\+\s+$Declare\s*\(\s*\*\s*$Ident\s*\)\s*[=,;:\[\(]/ ||
			# foo bar; where foo is some local typedef or #define
		      $sline =~ /^\+\s+$Ident(?:\s+|\s*\*\s*)$Ident\s*[=,;\[]/ ||
			# known declaration macros
		      $sline =~ /^\+\s+$declaration_macros/ ||
			# start of struct or union or enum
		      $sline =~ /^\+\s+(?:union|struct|enum|typedef)\b/ ||
			# start or end of block or continuation of declaration
		      $sline =~ /^\+\s+(?:$|[\{\}\.\#\"\?\:\(\[])/ ||
			# bitfield continuation
		      $sline =~ /^\+\s+$Ident\s*:\s*\d+\s*[,;]/ ||
			# other possible extensions of declaration lines
		      $sline =~ /^\+\s+\(?\s*(?:$Compare|$Assignment|$Operators)/) &&
			# indentation of previous and current line are the same
		    (($prevline =~ /\+(\s+)\S/) && $sline =~ /^\+$1\S/)) {
			if (WARN("LINE_SPACING",
				 "Missing a blank line after declarations\n" . $hereprev) &&
			    $fix) {
				fix_insert_line($fixlinenr, "\+");
			}
		}

# check for spaces at the beginning of a line.
# Exceptions:
#  1) within comments
#  2) indented preprocessor commands
#  3) hanging labels
		if ($rawline =~ /^\+ / && $line !~ /^\+ *(?:$;|#|$Ident:)/)  {
			my $herevet = "$here\n" . cat_vet($rawline) . "\n";
			if (WARN("LEADING_SPACE",
				 "please, no spaces at the start of a line\n" . $herevet) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/^\+([ \t]+)/"\+" . tabify($1)/e;
			}
		}

# check we are in a valid C source file if not then ignore this hunk
		next if ($realfile !~ /\.(h|c)$/);

# check for unusual line ending [ or (
		if ($line =~ /^\+.*([\[\(])\s*$/) {
			CHK("OPEN_ENDED_LINE",
			    "Lines should not end with a '$1'\n" . $herecurr);
		}

# check if this appears to be the start function declaration, save the name
		if ($sline =~ /^\+\{\s*$/ &&
		    $prevline =~ /^\+(?:(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*)?($Ident)\(/) {
			$context_function = $1;
		}

# check if this appears to be the end of function declaration
		if ($sline =~ /^\+\}\s*$/) {
			undef $context_function;
		}

# check indentation of any line with a bare else
# (but not if it is a multiple line "if (foo) return bar; else return baz;")
# if the previous line is a break or return and is indented 1 tab more...
		if ($sline =~ /^\+([\t]+)(?:}[ \t]*)?else(?:[ \t]*{)?\s*$/) {
			my $tabs = length($1) + 1;
			if ($prevline =~ /^\+\t{$tabs,$tabs}break\b/ ||
			    ($prevline =~ /^\+\t{$tabs,$tabs}return\b/ &&
			     defined $lines[$linenr] &&
			     $lines[$linenr] !~ /^[ \+]\t{$tabs,$tabs}return/)) {
				WARN("UNNECESSARY_ELSE",
				     "else is not generally useful after a break or return\n" . $hereprev);
			}
		}

# check indentation of a line with a break;
# if the previous line is a goto or return and is indented the same # of tabs
		if ($sline =~ /^\+([\t]+)break\s*;\s*$/) {
			my $tabs = $1;
			if ($prevline =~ /^\+$tabs(?:goto|return)\b/) {
				WARN("UNNECESSARY_BREAK",
				     "break is not useful after a goto or return\n" . $hereprev);
			}
		}

# check for RCS/CVS revision markers
		if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|)/) {
			WARN("CVS_KEYWORD",
			     "CVS style keyword markers, these will _not_ be updated\n". $herecurr);
		}

# Blackfin: don't use __builtin_bfin_[cs]sync
		if ($line =~ /__builtin_bfin_csync/) {
			my $herevet = "$here\n" . cat_vet($line) . "\n";
			ERROR("CSYNC",
			      "use the CSYNC() macro in asm/blackfin.h\n" . $herevet);
		}
		if ($line =~ /__builtin_bfin_ssync/) {
			my $herevet = "$here\n" . cat_vet($line) . "\n";
			ERROR("SSYNC",
			      "use the SSYNC() macro in asm/blackfin.h\n" . $herevet);
		}

# check for old HOTPLUG __dev<foo> section markings
		if ($line =~ /\b(__dev(init|exit)(data|const|))\b/) {
			WARN("HOTPLUG_SECTION",
			     "Using $1 is unnecessary\n" . $herecurr);
		}

# Check for potential 'bare' types
		my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
		    $realline_next);
#print "LINE<$line>\n";
		if ($linenr > $suppress_statement &&
		    $realcnt && $sline =~ /.\s*\S/) {
			($stat, $cond, $line_nr_next, $remain_next, $off_next) =
				ctx_statement_block($linenr, $realcnt, 0);
			$stat =~ s/\n./\n /g;
			$cond =~ s/\n./\n /g;

#print "linenr<$linenr> <$stat>\n";
			# If this statement has no statement boundaries within
			# it there is no point in retrying a statement scan
			# until we hit end of it.
			my $frag = $stat; $frag =~ s/;+\s*$//;
			if ($frag !~ /(?:{|;)/) {
#print "skip<$line_nr_next>\n";
				$suppress_statement = $line_nr_next;
			}

			# Find the real next line.
			$realline_next = $line_nr_next;
			if (defined $realline_next &&
			    (!defined $lines[$realline_next - 1] ||
			     substr($lines[$realline_next - 1], $off_next) =~ /^\s*$/)) {
				$realline_next++;
			}

			my $s = $stat;
			$s =~ s/{.*$//s;

			# Ignore goto labels.
			if ($s =~ /$Ident:\*$/s) {

			# Ignore functions being called
			} elsif ($s =~ /^.\s*$Ident\s*\(/s) {

			} elsif ($s =~ /^.\s*else\b/s) {

			# declarations always start with types
			} elsif ($prev_values eq 'E' && $s =~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?((?:\s*$Ident)+?)\b(?:\s+$Sparse)?\s*\**\s*(?:$Ident|\(\*[^\)]*\))(?:\s*$Modifier)?\s*(?:;|=|,|\()/s) {
				my $type = $1;
				$type =~ s/\s+/ /g;
				possible($type, "A:" . $s);

			# definitions in global scope can only start with types
			} elsif ($s =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?($Ident)\b\s*(?!:)/s) {
				possible($1, "B:" . $s);
			}

			# any (foo ... *) is a pointer cast, and foo is a type
			while ($s =~ /\(($Ident)(?:\s+$Sparse)*[\s\*]+\s*\)/sg) {
				possible($1, "C:" . $s);
			}

			# Check for any sort of function declaration.
			# int foo(something bar, other baz);
			# void (*store_gdt)(x86_descr_ptr *);
			if ($prev_values eq 'E' && $s =~ /^(.(?:typedef\s*)?(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*(?:\b$Ident|\(\*\s*$Ident\))\s*)\(/s) {
				my ($name_len) = length($1);

				my $ctx = $s;
				substr($ctx, 0, $name_len + 1, '');
				$ctx =~ s/\)[^\)]*$//;

				for my $arg (split(/\s*,\s*/, $ctx)) {
					if ($arg =~ /^(?:const\s+)?($Ident)(?:\s+$Sparse)*\s*\**\s*(:?\b$Ident)?$/s || $arg =~ /^($Ident)$/s) {

						possible($1, "D:" . $s);
					}
				}
			}

		}

#
# Checks which may be anchored in the context.
#

# Check for switch () and associated case and default
# statements should be at the same indent.
		if ($line=~/\bswitch\s*\(.*\)/) {
			my $err = '';
			my $sep = '';
			my @ctx = ctx_block_outer($linenr, $realcnt);
			shift(@ctx);
			for my $ctx (@ctx) {
				my ($clen, $cindent) = line_stats($ctx);
				if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
							$indent != $cindent) {
					$err .= "$sep$ctx\n";
					$sep = '';
				} else {
					$sep = "[...]\n";
				}
			}
			if ($err ne '') {
				ERROR("SWITCH_CASE_INDENT_LEVEL",
				      "switch and case should be at the same indent\n$hereline$err");
			}
		}

# if/while/etc brace do not go on next line, unless defining a do while loop,
# or if that brace on the next line is for something else
		if ($line =~ /(.*)\b((?:if|while|for|switch|(?:[a-z_]+|)frr_(each|with)[a-z_]+)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) {
			my $pre_ctx = "$1$2";

			my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);

			if ($line =~ /^\+\t{6,}/) {
				WARN("DEEP_INDENTATION",
				     "Too many leading tabs - consider code refactoring\n" . $herecurr);
			}

			my $ctx_cnt = $realcnt - $#ctx - 1;
			my $ctx = join("\n", @ctx);

			my $ctx_ln = $linenr;
			my $ctx_skip = $realcnt;

			while ($ctx_skip > $ctx_cnt || ($ctx_skip == $ctx_cnt &&
					defined $lines[$ctx_ln - 1] &&
					$lines[$ctx_ln - 1] =~ /^-/)) {
				##print "SKIP<$ctx_skip> CNT<$ctx_cnt>\n";
				$ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
				$ctx_ln++;
			}

			#print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n";
			#print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";

			if ($ctx !~ /{\s*/ && defined($lines[$ctx_ln - 1]) && $lines[$ctx_ln - 1] =~ /^\+\s*{/) {
				ERROR("OPEN_BRACE",
				      "that open brace { should be on the previous line\n" .
					"$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
			}
			if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
			    $ctx =~ /\)\s*\;\s*$/ &&
			    defined $lines[$ctx_ln - 1])
			{
				my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
				if ($nindent > $indent) {
					WARN("TRAILING_SEMICOLON",
					     "trailing semicolon indicates no statements, indent implies otherwise\n" .
						"$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
				}
			}
		}

# Check relative indent for conditionals and blocks.
		if ($line =~ /\b(?:(?:if|while|for|(?:[a-z_]+|)frr_(each|with)[a-z_]+)\s*\(|(?:do|else)\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
			($stat, $cond, $line_nr_next, $remain_next, $off_next) =
				ctx_statement_block($linenr, $realcnt, 0)
					if (!defined $stat);
			my ($s, $c) = ($stat, $cond);

			substr($s, 0, length($c), '');

			# remove inline comments
			$s =~ s/$;/ /g;
			$c =~ s/$;/ /g;

			# Find out how long the conditional actually is.
			my @newlines = ($c =~ /\n/gs);
			my $cond_lines = 1 + $#newlines;

			# Make sure we remove the line prefixes as we have
			# none on the first line, and are going to readd them
			# where necessary.
			$s =~ s/\n./\n/gs;
			while ($s =~ /\n\s+\\\n/) {
				$cond_lines += $s =~ s/\n\s+\\\n/\n/g;
			}

			# We want to check the first line inside the block
			# starting at the end of the conditional, so remove:
			#  1) any blank line termination
			#  2) any opening brace { on end of the line
			#  3) any do (...) {
			my $continuation = 0;
			my $check = 0;
			$s =~ s/^.*\bdo\b//;
			$s =~ s/^\s*{//;
			if ($s =~ s/^\s*\\//) {
				$continuation = 1;
			}
			if ($s =~ s/^\s*?\n//) {
				$check = 1;
				$cond_lines++;
			}

			# Also ignore a loop construct at the end of a
			# preprocessor statement.
			if (($prevline =~ /^.\s*#\s*define\s/ ||
			    $prevline =~ /\\\s*$/) && $continuation == 0) {
				$check = 0;
			}

			my $cond_ptr = -1;
			$continuation = 0;
			while ($cond_ptr != $cond_lines) {
				$cond_ptr = $cond_lines;

				# If we see an #else/#elif then the code
				# is not linear.
				if ($s =~ /^\s*\#\s*(?:else|elif)/) {
					$check = 0;
				}

				# Ignore:
				#  1) blank lines, they should be at 0,
				#  2) preprocessor lines, and
				#  3) labels.
				if ($continuation ||
				    $s =~ /^\s*?\n/ ||
				    $s =~ /^\s*#\s*?/ ||
				    $s =~ /^\s*$Ident\s*:/) {
					$continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
					if ($s =~ s/^.*?\n//) {
						$cond_lines++;
					}
				}
			}

			my (undef, $sindent) = line_stats("+" . $s);
			my $stat_real = raw_line($linenr, $cond_lines);

			# Check if either of these lines are modified, else
			# this is not this patch's fault.
			if (!defined($stat_real) ||
			    $stat !~ /^\+/ && $stat_real !~ /^\+/) {
				$check = 0;
			}
			if (defined($stat_real) && $cond_lines > 1) {
				$stat_real = "[...]\n$stat_real";
			}

			#print "line<$line> prevline<$prevline> indent<$indent> sindent<$sindent> check<$check> continuation<$continuation> s<$s> cond_lines<$cond_lines> stat_real<$stat_real> stat<$stat>\n";

			if ($check && $s ne '' &&
			    (($sindent % 8) != 0 ||
			     ($sindent < $indent) ||
			     ($sindent == $indent &&
			      ($s !~ /^\s*(?:\}|\{|else\b)/)) ||
			     ($sindent > $indent + 8))) {
				WARN("SUSPECT_CODE_INDENT",
				     "suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
			}
		}

		# Track the 'values' across context and added lines.
		my $opline = $line; $opline =~ s/^./ /;
		my ($curr_values, $curr_vars) =
				annotate_values($opline . "\n", $prev_values);
		$curr_values = $prev_values . $curr_values;
		if ($dbg_values) {
			my $outline = $opline; $outline =~ s/\t/ /g;
			print "$linenr > .$outline\n";
			print "$linenr > $curr_values\n";
			print "$linenr >  $curr_vars\n";
		}
		$prev_values = substr($curr_values, -1);

#ignore lines not being added
		next if ($line =~ /^[^\+]/);

# check for dereferences that span multiple lines
		if ($prevline =~ /^\+.*$Lval\s*(?:\.|->)\s*$/ &&
		    $line =~ /^\+\s*(?!\#\s*(?!define\s+|if))\s*$Lval/) {
			$prevline =~ /($Lval\s*(?:\.|->))\s*$/;
			my $ref = $1;
			$line =~ /^.\s*($Lval)/;
			$ref .= $1;
			$ref =~ s/\s//g;
			WARN("MULTILINE_DEREFERENCE",
			     "Avoid multiple line dereference - prefer '$ref'\n" . $hereprev);
		}

# check for declarations of signed or unsigned without int
		while ($line =~ m{\b($Declare)\s*(?!char\b|short\b|int\b|long\b)\s*($Ident)?\s*[=,;\[\)\(]}g) {
			my $type = $1;
			my $var = $2;
			$var = "" if (!defined $var);
			if ($type =~ /^(?:(?:$Storage|$Inline|$Attribute)\s+)*((?:un)?signed)((?:\s*\*)*)\s*$/) {
				my $sign = $1;
				my $pointer = $2;

				$pointer = "" if (!defined $pointer);

				if (WARN("UNSPECIFIED_INT",
					 "Prefer '" . trim($sign) . " int" . rtrim($pointer) . "' to bare use of '$sign" . rtrim($pointer) . "'\n" . $herecurr) &&
				    $fix) {
					my $decl = trim($sign) . " int ";
					my $comp_pointer = $pointer;
					$comp_pointer =~ s/\s//g;
					$decl .= $comp_pointer;
					$decl = rtrim($decl) if ($var eq "");
					$fixed[$fixlinenr] =~ s@\b$sign\s*\Q$pointer\E\s*$var\b@$decl$var@;
				}
			}
		}

# TEST: allow direct testing of the type matcher.
		if ($dbg_type) {
			if ($line =~ /^.\s*$Declare\s*$/) {
				ERROR("TEST_TYPE",
				      "TEST: is type\n" . $herecurr);
			} elsif ($dbg_type > 1 && $line =~ /^.+($Declare)/) {
				ERROR("TEST_NOT_TYPE",
				      "TEST: is not type ($1 is)\n". $herecurr);
			}
			next;
		}
# TEST: allow direct testing of the attribute matcher.
		if ($dbg_attr) {
			if ($line =~ /^.\s*$Modifier\s*$/) {
				ERROR("TEST_ATTR",
				      "TEST: is attr\n" . $herecurr);
			} elsif ($dbg_attr > 1 && $line =~ /^.+($Modifier)/) {
				ERROR("TEST_NOT_ATTR",
				      "TEST: is not attr ($1 is)\n". $herecurr);
			}
			next;
		}

# check for initialisation to aggregates open brace on the next line
		if ($line =~ /^.\s*{/ &&
		    $prevline =~ /(?:^|[^=])=\s*$/) {
			if (ERROR("OPEN_BRACE",
				  "that open brace { should be on the previous line\n" . $hereprev) &&
			    $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
				fix_delete_line($fixlinenr - 1, $prevrawline);
				fix_delete_line($fixlinenr, $rawline);
				my $fixedline = $prevrawline;
				$fixedline =~ s/\s*=\s*$/ = {/;
				fix_insert_line($fixlinenr, $fixedline);
				$fixedline = $line;
				$fixedline =~ s/^(.\s*)\{\s*/$1/;
				fix_insert_line($fixlinenr, $fixedline);
			}
		}

#
# Checks which are anchored on the added line.
#

# check for malformed paths in #include statements (uses RAW line)
		if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
			my $path = $1;
			if ($path =~ m{//}) {
				ERROR("MALFORMED_INCLUDE",
				      "malformed #include filename\n" . $herecurr);
			}
			if ($path =~ "^uapi/" && $realfile =~ m@\binclude/uapi/@) {
				ERROR("UAPI_INCLUDE",
				      "No #include in ...include/uapi/... should use a uapi/ path prefix\n" . $herecurr);
			}
		}

# no C99 // comments
		if ($line =~ m{//}) {
			if (!$allow_c99_comments) {
				if(ERROR("C99_COMMENTS",
					 "do not use C99 // comments\n" . $herecurr) &&
				   $fix) {
					my $line = $fixed[$fixlinenr];
					if ($line =~ /\/\/(.*)$/) {
						my $comment = trim($1);
						$fixed[$fixlinenr] =~ s@\/\/(.*)$@/\* $comment \*/@;
					}
				}
			} else {
				WARN("C99_COMMENTS",
				     "C99 // comments do not match recommendation\n" . $herecurr);
			}
		}
		# Remove C99 comments.
		$line =~ s@//.*@@;
		$opline =~ s@//.*@@;

# EXPORT_SYMBOL should immediately follow the thing it is exporting, consider
# the whole statement.
#print "APW <$lines[$realline_next - 1]>\n";
		if (defined $realline_next &&
		    exists $lines[$realline_next - 1] &&
		    !defined $suppress_export{$realline_next} &&
		    ($lines[$realline_next - 1] =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
		     $lines[$realline_next - 1] =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
			# Handle definitions which produce identifiers with
			# a prefix:
			#   XXX(foo);
			#   EXPORT_SYMBOL(something_foo);
			my $name = $1;
			if ($stat =~ /^(?:.\s*}\s*\n)?.([A-Z_]+)\s*\(\s*($Ident)/ &&
			    $name =~ /^${Ident}_$2/) {
#print "FOO C name<$name>\n";
				$suppress_export{$realline_next} = 1;

			} elsif ($stat !~ /(?:
				\n.}\s*$|
				^.DEFINE_$Ident\(\Q$name\E\)|
				^.DECLARE_$Ident\(\Q$name\E\)|
				^.LIST_HEAD\(\Q$name\E\)|
				^.(?:$Storage\s+)?$Type\s*\(\s*\*\s*\Q$name\E\s*\)\s*\(|
				\b\Q$name\E(?:\s+$Attribute)*\s*(?:;|=|\[|\()
			    )/x) {
#print "FOO A<$lines[$realline_next - 1]> stat<$stat> name<$name>\n";
				$suppress_export{$realline_next} = 2;
			} else {
				$suppress_export{$realline_next} = 1;
			}
		}
		if (!defined $suppress_export{$linenr} &&
		    $prevline =~ /^.\s*$/ &&
		    ($line =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
		     $line =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
#print "FOO B <$lines[$linenr - 1]>\n";
			$suppress_export{$linenr} = 2;
		}
		if (defined $suppress_export{$linenr} &&
		    $suppress_export{$linenr} == 2) {
			WARN("EXPORT_SYMBOL",
			     "EXPORT_SYMBOL(foo); should immediately follow its function/variable\n" . $herecurr);
		}

# check for global initialisers.
		if ($line =~ /^\+$Type\s*$Ident(?:\s+$Modifier)*\s*=\s*($zero_initializer)\s*;/) {
			if (ERROR("GLOBAL_INITIALISERS",
				  "do not initialise globals to $1\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/(^.$Type\s*$Ident(?:\s+$Modifier)*)\s*=\s*$zero_initializer\s*;/$1;/;
			}
		}
# check for static initialisers.
		if ($line =~ /^\+.*\bstatic\s.*=\s*($zero_initializer)\s*;/) {
			if (ERROR("INITIALISED_STATIC",
				  "do not initialise statics to $1\n" .
				      $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/(\bstatic\s.*?)\s*=\s*$zero_initializer\s*;/$1;/;
			}
		}

# check for misordered declarations of char/short/int/long with signed/unsigned
		while ($sline =~ m{(\b$TypeMisordered\b)}g) {
			my $tmp = trim($1);
			WARN("MISORDERED_TYPE",
			     "type '$tmp' should be specified in [[un]signed] [short|int|long|long long] order\n" . $herecurr);
		}

# check for static const char * arrays.
		if ($line =~ /\bstatic\s+const\s+char\s*\*\s*(\w+)\s*\[\s*\]\s*=\s*/) {
			WARN("STATIC_CONST_CHAR_ARRAY",
			     "static const char * array should probably be static const char * const\n" .
				$herecurr);
               }

# check for static char foo[] = "bar" declarations.
		if ($line =~ /\bstatic\s+char\s+(\w+)\s*\[\s*\]\s*=\s*"/) {
			WARN("STATIC_CONST_CHAR_ARRAY",
			     "static char array declaration should probably be static const char\n" .
				$herecurr);
               }

# check for const <foo> const where <foo> is not a pointer or array type
		if ($sline =~ /\bconst\s+($BasicType)\s+const\b/) {
			my $found = $1;
			if ($sline =~ /\bconst\s+\Q$found\E\s+const\b\s*\*/) {
				WARN("CONST_CONST",
				     "'const $found const *' should probably be 'const $found * const'\n" . $herecurr);
			} elsif ($sline !~ /\bconst\s+\Q$found\E\s+const\s+\w+\s*\[/) {
				WARN("CONST_CONST",
				     "'const $found const' should probably be 'const $found'\n" . $herecurr);
			}
		}

# check for non-global char *foo[] = {"bar", ...} declarations.
		if ($line =~ /^.\s+(?:static\s+|const\s+)?char\s+\*\s*\w+\s*\[\s*\]\s*=\s*\{/) {
			WARN("STATIC_CONST_CHAR_ARRAY",
			     "char * array declaration might be better as static const\n" .
				$herecurr);
               }

# check for sizeof(foo)/sizeof(foo[0]) that could be ARRAY_SIZE(foo)
		if ($line =~ m@\bsizeof\s*\(\s*($Lval)\s*\)@) {
			my $array = $1;
			if ($line =~ m@\b(sizeof\s*\(\s*\Q$array\E\s*\)\s*/\s*sizeof\s*\(\s*\Q$array\E\s*\[\s*0\s*\]\s*\))@) {
				my $array_div = $1;
				if (WARN("ARRAY_SIZE",
					 "Prefer ARRAY_SIZE($array)\n" . $herecurr) &&
				    $fix) {
					$fixed[$fixlinenr] =~ s/\Q$array_div\E/ARRAY_SIZE($array)/;
				}
			}
		}

# check for function declarations without arguments like "int foo()"
		if ($line =~ /(\b$Type\s+$Ident)\s*\(\s*\)/) {
			if (ERROR("FUNCTION_WITHOUT_ARGS",
				  "Bad function definition - $1() should probably be $1(void)\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/(\b($Type)\s+($Ident))\s*\(\s*\)/$2 $3(void)/;
			}
		}

# check for new typedefs, only function parameters and sparse annotations
# make sense.
		if ($line =~ /\btypedef\s/ &&
		    $line !~ /\btypedef\s+$Type\s*\(\s*\*?$Ident\s*\)\s*\(/ &&
		    $line !~ /\btypedef\s+$Type\s+$Ident\s*\(/ &&
		    $line !~ /\b$typeTypedefs\b/ &&
		    $line !~ /\b__bitwise\b/) {
			WARN("NEW_TYPEDEFS",
			     "do not add new typedefs\n" . $herecurr);
		}

# * goes on variable not on type
		# (char*[ const])
		while ($line =~ m{(\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\))}g) {
			#print "AA<$1>\n";
			my ($ident, $from, $to) = ($1, $2, $2);

			# Should start with a space.
			$to =~ s/^(\S)/ $1/;
			# Should not end with a space.
			$to =~ s/\s+$//;
			# '*'s should not have spaces between.
			while ($to =~ s/\*\s+\*/\*\*/) {
			}

##			print "1: from<$from> to<$to> ident<$ident>\n";
			if ($from ne $to) {
				if (ERROR("POINTER_LOCATION",
					  "\"(foo$from)\" should be \"(foo$to)\"\n" .  $herecurr) &&
				    $fix) {
					my $sub_from = $ident;
					my $sub_to = $ident;
					$sub_to =~ s/\Q$from\E/$to/;
					$fixed[$fixlinenr] =~
					    s@\Q$sub_from\E@$sub_to@;
				}
			}
		}
		while ($line =~ m{(\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident))}g) {
			#print "BB<$1>\n";
			my ($match, $from, $to, $ident) = ($1, $2, $2, $3);

			# Should start with a space.
			$to =~ s/^(\S)/ $1/;
			# Should not end with a space.
			$to =~ s/\s+$//;
			# '*'s should not have spaces between.
			while ($to =~ s/\*\s+\*/\*\*/) {
			}
			# Modifiers should have spaces.
			$to =~ s/(\b$Modifier$)/$1 /;

##			print "2: from<$from> to<$to> ident<$ident>\n";
			if ($from ne $to && $ident !~ /^$Modifier$/) {
				if (ERROR("POINTER_LOCATION",
					  "\"foo${from}bar\" should be \"foo${to}bar\"\n" .  $herecurr) &&
				    $fix) {

					my $sub_from = $match;
					my $sub_to = $match;
					$sub_to =~ s/\Q$from\E/$to/;
					$fixed[$fixlinenr] =~
					    s@\Q$sub_from\E@$sub_to@;
				}
			}
		}

# avoid BUG() or BUG_ON()
		if ($line =~ /\b(?:BUG|BUG_ON)\b/) {
			my $msg_level = \&WARN;
			$msg_level = \&CHK if ($file);
			&{$msg_level}("AVOID_BUG",
				      "Avoid crashing the kernel - try using WARN_ON & recovery code rather than BUG() or BUG_ON()\n" . $herecurr);
		}

# avoid LINUX_VERSION_CODE
		if ($line =~ /\bLINUX_VERSION_CODE\b/) {
			WARN("LINUX_VERSION_CODE",
			     "LINUX_VERSION_CODE should be avoided, code should be for the version to which it is merged\n" . $herecurr);
		}

# check for uses of printk_ratelimit
		if ($line =~ /\bprintk_ratelimit\s*\(/) {
			WARN("PRINTK_RATELIMITED",
			     "Prefer printk_ratelimited or pr_<level>_ratelimited to printk_ratelimit\n" . $herecurr);
		}

# printk should use KERN_* levels
		if ($line =~ /\bprintk\s*\(\s*(?!KERN_[A-Z]+\b)/) {
			WARN("PRINTK_WITHOUT_KERN_LEVEL",
			     "printk() should include KERN_<LEVEL> facility level\n" . $herecurr);
		}

		if ($line =~ /\bprintk\s*\(\s*KERN_([A-Z]+)/) {
			my $orig = $1;
			my $level = lc($orig);
			$level = "warn" if ($level eq "warning");
			my $level2 = $level;
			$level2 = "dbg" if ($level eq "debug");
			WARN("PREFER_PR_LEVEL",
			     "Prefer [subsystem eg: netdev]_$level2([subsystem]dev, ... then dev_$level2(dev, ... then pr_$level(...  to printk(KERN_$orig ...\n" . $herecurr);
		}

		if ($line =~ /\bpr_warning\s*\(/) {
			if (WARN("PREFER_PR_LEVEL",
				 "Prefer pr_warn(... to pr_warning(...\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~
				    s/\bpr_warning\b/pr_warn/;
			}
		}

		if ($line =~ /\bdev_printk\s*\(\s*KERN_([A-Z]+)/) {
			my $orig = $1;
			my $level = lc($orig);
			$level = "warn" if ($level eq "warning");
			$level = "dbg" if ($level eq "debug");
			WARN("PREFER_DEV_LEVEL",
			     "Prefer dev_$level(... to dev_printk(KERN_$orig, ...\n" . $herecurr);
		}

# ENOSYS means "bad syscall nr" and nothing else.  This will have a small
# number of false positives, but assembly files are not checked, so at
# least the arch entry code will not trigger this warning.
		if ($line =~ /\bENOSYS\b/) {
			WARN("ENOSYS",
			     "ENOSYS means 'invalid syscall nr' and nothing else\n" . $herecurr);
		}

# function brace can't be on same line, except for #defines of do while,
# or if closed on same line
		if (($line=~/$Type\s*$Ident\(.*\).*\s*{/) and
		    !($line=~/\#\s*define.*do\s\{/) and !($line=~/}/)) {
			if (ERROR("OPEN_BRACE",
				  "open brace '{' following function declarations go on the next line\n" . $herecurr) &&
			    $fix) {
				fix_delete_line($fixlinenr, $rawline);
				my $fixed_line = $rawline;
				$fixed_line =~ /(^..*$Type\s*$Ident\(.*\)\s*){(.*)$/;
				my $line1 = $1;
				my $line2 = $2;
				fix_insert_line($fixlinenr, ltrim($line1));
				fix_insert_line($fixlinenr, "\+{");
				if ($line2 !~ /^\s*$/) {
					fix_insert_line($fixlinenr, "\+\t" . trim($line2));
				}
			}
		}

# open braces for enum, union and struct go on the same line.
		if ($line =~ /^.\s*{/ &&
		    $prevline =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?\s*$/) {
			if (ERROR("OPEN_BRACE",
				  "open brace '{' following $1 go on the same line\n" . $hereprev) &&
			    $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
				fix_delete_line($fixlinenr - 1, $prevrawline);
				fix_delete_line($fixlinenr, $rawline);
				my $fixedline = rtrim($prevrawline) . " {";
				fix_insert_line($fixlinenr, $fixedline);
				$fixedline = $rawline;
				$fixedline =~ s/^(.\s*)\{\s*/$1\t/;
				if ($fixedline !~ /^\+\s*$/) {
					fix_insert_line($fixlinenr, $fixedline);
				}
			}
		}

# missing space after union, struct or enum definition
		if ($line =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident){1,2}[=\{]/) {
			if (WARN("SPACING",
				 "missing space after $1 definition\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~
				    s/^(.\s*(?:typedef\s+)?(?:enum|union|struct)(?:\s+$Ident){1,2})([=\{])/$1 $2/;
			}
		}

# Function pointer declarations
# check spacing between type, funcptr, and args
# canonical declaration is "type (*funcptr)(args...)"
		if ($line =~ /^.\s*($Declare)\((\s*)\*(\s*)($Ident)(\s*)\)(\s*)\(/) {
			my $declare = $1;
			my $pre_pointer_space = $2;
			my $post_pointer_space = $3;
			my $funcname = $4;
			my $post_funcname_space = $5;
			my $pre_args_space = $6;

# the $Declare variable will capture all spaces after the type
# so check it for a missing trailing missing space but pointer return types
# don't need a space so don't warn for those.
			my $post_declare_space = "";
			if ($declare =~ /(\s+)$/) {
				$post_declare_space = $1;
				$declare = rtrim($declare);
			}
			if ($declare !~ /\*$/ && $post_declare_space =~ /^$/) {
				WARN("SPACING",
				     "missing space after return type\n" . $herecurr);
				$post_declare_space = " ";
			}

# unnecessary space "type  (*funcptr)(args...)"
# This test is not currently implemented because these declarations are
# equivalent to
#	int  foo(int bar, ...)
# and this is form shouldn't/doesn't generate a checkpatch warning.
#
#			elsif ($declare =~ /\s{2,}$/) {
#				WARN("SPACING",
#				     "Multiple spaces after return type\n" . $herecurr);
#			}

# unnecessary space "type ( *funcptr)(args...)"
			if (defined $pre_pointer_space &&
			    $pre_pointer_space =~ /^\s/) {
				WARN("SPACING",
				     "Unnecessary space after function pointer open parenthesis\n" . $herecurr);
			}

# unnecessary space "type (* funcptr)(args...)"
			if (defined $post_pointer_space &&
			    $post_pointer_space =~ /^\s/) {
				WARN("SPACING",
				     "Unnecessary space before function pointer name\n" . $herecurr);
			}

# unnecessary space "type (*funcptr )(args...)"
			if (defined $post_funcname_space &&
			    $post_funcname_space =~ /^\s/) {
				WARN("SPACING",
				     "Unnecessary space after function pointer name\n" . $herecurr);
			}

# unnecessary space "type (*funcptr) (args...)"
			if (defined $pre_args_space &&
			    $pre_args_space =~ /^\s/) {
				WARN("SPACING",
				     "Unnecessary space before function pointer arguments\n" . $herecurr);
			}

			if (show_type("SPACING") && $fix) {
				$fixed[$fixlinenr] =~
				    s/^(.\s*)$Declare\s*\(\s*\*\s*$Ident\s*\)\s*\(/$1 . $declare . $post_declare_space . '(*' . $funcname . ')('/ex;
			}
		}

# check for spacing round square brackets; allowed:
#  1. with a type on the left -- int [] a;
#  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
#  3. inside a curly brace -- = { [0...10] = 5 }
		while ($line =~ /(.*?\s)\[/g) {
			my ($where, $prefix) = ($-[1], $1);
			if ($prefix !~ /$Type\s+$/ &&
			    ($where != 0 || $prefix !~ /^.\s+$/) &&
			    $prefix !~ /[{,]\s+$/) {
				if (ERROR("BRACKET_SPACE",
					  "space prohibited before open square bracket '['\n" . $herecurr) &&
				    $fix) {
				    $fixed[$fixlinenr] =~
					s/^(\+.*?)\s+\[/$1\[/;
				}
			}
		}

# check for spaces between functions and their parentheses.
		while ($line =~ /($Ident)\s+\(/g) {
			my $name = $1;
			my $ctx_before = substr($line, 0, $-[1]);
			my $ctx = "$ctx_before$name";

			# Ignore those directives where spaces _are_ permitted.
			if ($name =~ /^(?:
				if|for|while|switch|return|case|
				volatile|__volatile__|
				__attribute__|format|__extension__|
				asm|__asm__|
				$Iterators)$/x)
			{
			# cpp #define statements have non-optional spaces, ie
			# if there is a space between the name and the open
			# parenthesis it is simply not a parameter group.
			} elsif ($ctx_before =~ /^.\s*\#\s*define\s*$/) {

			# cpp #elif statement condition may start with a (
			} elsif ($ctx =~ /^.\s*\#\s*elif\s*$/) {

			# If this whole things ends with a type its most
			# likely a typedef for a function.
			} elsif ($ctx =~ /$Type$/) {

			# All-uppercase function names are usually macros,
			# ignore those
			} elsif ($name eq uc $name) {

			} else {
				if (WARN("SPACING",
					 "space prohibited between function name and open parenthesis '('\n" . $herecurr) &&
					     $fix) {
					$fixed[$fixlinenr] =~
					    s/\b$name\s+\(/$name\(/;
				}
			}
		}

# Check operator spacing.
		if (!($line=~/\#\s*include/)) {
			my $fixed_line = "";
			my $line_fixed = 0;

			my $ops = qr{
				<<=|>>=|<=|>=|==|!=|
				\+=|-=|\*=|\/=|%=|\^=|\|=|&=|
				=>|->|<<|>>|<|>|=|!|~|
				&&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
				\?:|\?|:
			}x;
			my @elements = split(/($ops|;)/, $opline);

##			print("element count: <" . $#elements . ">\n");
##			foreach my $el (@elements) {
##				print("el: <$el>\n");
##			}

			my @fix_elements = ();
			my $off = 0;

			foreach my $el (@elements) {
				push(@fix_elements, substr($rawline, $off, length($el)));
				$off += length($el);
			}

			$off = 0;

			my $blank = copy_spacing($opline);
			my $last_after = -1;

			for (my $n = 0; $n < $#elements; $n += 2) {

				my $good = $fix_elements[$n] . $fix_elements[$n + 1];

##				print("n: <$n> good: <$good>\n");

				$off += length($elements[$n]);

				# Pick up the preceding and succeeding characters.
				my $ca = substr($opline, 0, $off);
				my $cc = '';
				if (length($opline) >= ($off + length($elements[$n + 1]))) {
					$cc = substr($opline, $off + length($elements[$n + 1]));
				}
				my $cb = "$ca$;$cc";

				my $a = '';
				$a = 'V' if ($elements[$n] ne '');
				$a = 'W' if ($elements[$n] =~ /\s$/);
				$a = 'C' if ($elements[$n] =~ /$;$/);
				$a = 'B' if ($elements[$n] =~ /(\[|\()$/);
				$a = 'O' if ($elements[$n] eq '');
				$a = 'E' if ($ca =~ /^\s*$/);

				my $op = $elements[$n + 1];

				my $c = '';
				if (defined $elements[$n + 2]) {
					$c = 'V' if ($elements[$n + 2] ne '');
					$c = 'W' if ($elements[$n + 2] =~ /^\s/);
					$c = 'C' if ($elements[$n + 2] =~ /^$;/);
					$c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
					$c = 'O' if ($elements[$n + 2] eq '');
					$c = 'E' if ($elements[$n + 2] =~ /^\s*\\$/);
				} else {
					$c = 'E';
				}

				my $ctx = "${a}x${c}";

				my $at = "(ctx:$ctx)";

				my $ptr = substr($blank, 0, $off) . "^";
				my $hereptr = "$hereline$ptr\n";

				# Pull out the value of this operator.
				my $op_type = substr($curr_values, $off + 1, 1);

				# Get the full operator variant.
				my $opv = $op . substr($curr_vars, $off, 1);

				# Ignore operators passed as parameters.
				if ($op_type ne 'V' &&
				    $ca =~ /\s$/ && $cc =~ /^\s*[,\)]/) {

#				# Ignore comments
#				} elsif ($op =~ /^$;+$/) {

				# ; should have either the end of line or a space or \ after it
				} elsif ($op eq ';') {
					if ($ctx !~ /.x[WEBC]/ &&
					    $cc !~ /^\\/ && $cc !~ /^;/) {
						if (ERROR("SPACING",
							  "space required after that '$op' $at\n" . $hereptr)) {
							$good = $fix_elements[$n] . trim($fix_elements[$n + 1]) . " ";
							$line_fixed = 1;
						}
					}

				# // is a comment
				} elsif ($op eq '//') {

				#   :   when part of a bitfield
				} elsif ($opv eq ':B') {
					# skip the bitfield test for now

				# No spaces for:
				#   ->
				} elsif ($op eq '->') {
					if ($ctx =~ /Wx.|.xW/) {
						if (ERROR("SPACING",
							  "spaces prohibited around that '$op' $at\n" . $hereptr)) {
							$good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
							if (defined $fix_elements[$n + 2]) {
								$fix_elements[$n + 2] =~ s/^\s+//;
							}
							$line_fixed = 1;
						}
					}

				# , must not have a space before and must have a space on the right.
				} elsif ($op eq ',') {
					my $rtrim_before = 0;
					my $space_after = 0;
					if ($line=~/\#\s*define/) {
						# ignore , spacing in macros
					} elsif ($ctx =~ /Wx./) {
						if (ERROR("SPACING",
							  "space prohibited before that '$op' $at\n" . $hereptr)) {
							$line_fixed = 1;
							$rtrim_before = 1;
						}
					}
					if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/) {
						if (ERROR("SPACING",
							  "space required after that '$op' $at\n" . $hereptr)) {
							$line_fixed = 1;
							$last_after = $n;
							$space_after = 1;
						}
					}
					if ($rtrim_before || $space_after) {
						if ($rtrim_before) {
							$good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
						} else {
							$good = $fix_elements[$n] . trim($fix_elements[$n + 1]);
						}
						if ($space_after) {
							$good .= " ";
						}
					}

				# '*' as part of a type definition -- reported already.
				} elsif ($opv eq '*_') {
					#warn "'*' is part of type\n";

				# unary operators should have a space before and
				# none after.  May be left adjacent to another
				# unary operator, or a cast
				} elsif ($op eq '!' || $op eq '~' ||
					 $opv eq '*U' || $opv eq '-U' ||
					 $opv eq '&U' || $opv eq '&&U') {
					if ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
						if (ERROR("SPACING",
							  "space required before that '$op' $at\n" . $hereptr)) {
							if ($n != $last_after + 2) {
								$good = $fix_elements[$n] . " " . ltrim($fix_elements[$n + 1]);
								$line_fixed = 1;
							}
						}
					}
					if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
						# A unary '*' may be const

					} elsif ($ctx =~ /.xW/) {
						if (ERROR("SPACING",
							  "space prohibited after that '$op' $at\n" . $hereptr)) {
							$good = $fix_elements[$n] . rtrim($fix_elements[$n + 1]);
							if (defined $fix_elements[$n + 2]) {
								$fix_elements[$n + 2] =~ s/^\s+//;
							}
							$line_fixed = 1;
						}
					}

				# unary ++ and unary -- are allowed no space on one side.
				} elsif ($op eq '++' or $op eq '--') {
					if ($ctx !~ /[WEOBC]x[^W]/ && $ctx !~ /[^W]x[WOBEC]/) {
						if (ERROR("SPACING",
							  "space required one side of that '$op' $at\n" . $hereptr)) {
							$good = $fix_elements[$n] . trim($fix_elements[$n + 1]) . " ";
							$line_fixed = 1;
						}
					}
					if ($ctx =~ /Wx[BE]/ ||
					    ($ctx =~ /Wx./ && $cc =~ /^;/)) {
						if (ERROR("SPACING",
							  "space prohibited before that '$op' $at\n" . $hereptr)) {
							$good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
							$line_fixed = 1;
						}
					}
					if ($ctx =~ /ExW/) {
						if (ERROR("SPACING",
							  "space prohibited after that '$op' $at\n" . $hereptr)) {
							$good = $fix_elements[$n] . trim($fix_elements[$n + 1]);
							if (defined $fix_elements[$n + 2]) {
								$fix_elements[$n + 2] =~ s/^\s+//;
							}
							$line_fixed = 1;
						}
					}

				# << and >> may either have or not have spaces both sides
				} elsif ($op eq '<<' or $op eq '>>' or
					 $op eq '&' or $op eq '^' or $op eq '|' or
					 $op eq '+' or $op eq '-' or
					 $op eq '*' or $op eq '/' or
					 $op eq '%')
				{
					if ($check) {
						if (defined $fix_elements[$n + 2] && $ctx !~ /[EW]x[EW]/) {
							if (CHK("SPACING",
								"spaces preferred around that '$op' $at\n" . $hereptr)) {
								$good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " ";
								$fix_elements[$n + 2] =~ s/^\s+//;
								$line_fixed = 1;
							}
						} elsif (!defined $fix_elements[$n + 2] && $ctx !~ /Wx[OE]/) {
							if (CHK("SPACING",
								"space preferred before that '$op' $at\n" . $hereptr)) {
								$good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]);
								$line_fixed = 1;
							}
						}
					} elsif ($ctx =~ /Wx[^WCE]|[^WCE]xW/) {
						if (ERROR("SPACING",
							  "need consistent spacing around '$op' $at\n" . $hereptr)) {
							$good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " ";
							if (defined $fix_elements[$n + 2]) {
								$fix_elements[$n + 2] =~ s/^\s+//;
							}
							$line_fixed = 1;
						}
					}

				# A colon needs no spaces before when it is
				# terminating a case value or a label.
				} elsif ($opv eq ':C' || $opv eq ':L') {
					if ($ctx =~ /Wx./) {
						if (ERROR("SPACING",
							  "space prohibited before that '$op' $at\n" . $hereptr)) {
							$good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
							$line_fixed = 1;
						}
					}

				# All the others need spaces both sides.
				} elsif ($ctx !~ /[EWC]x[CWE]/) {
					my $ok = 0;

					# Ignore email addresses <foo@bar>
					if (($op eq '<' &&
					     $cc =~ /^\S+\@\S+>/) ||
					    ($op eq '>' &&
					     $ca =~ /<\S+\@\S+$/))
					{
					    	$ok = 1;
					}

					# for asm volatile statements
					# ignore a colon with another
					# colon immediately before or after
					if (($op eq ':') &&
					    ($ca =~ /:$/ || $cc =~ /^:/)) {
						$ok = 1;
					}

					# messages are ERROR, but ?: are CHK
					if ($ok == 0) {
						my $msg_level = \&ERROR;
						$msg_level = \&CHK if (($op eq '?:' || $op eq '?' || $op eq ':') && $ctx =~ /VxV/);

						if (&{$msg_level}("SPACING",
								  "spaces required around that '$op' $at\n" . $hereptr)) {
							$good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " ";
							if (defined $fix_elements[$n + 2]) {
								$fix_elements[$n + 2] =~ s/^\s+//;
							}
							$line_fixed = 1;
						}
					}
				}
				$off += length($elements[$n + 1]);

##				print("n: <$n> GOOD: <$good>\n");

				$fixed_line = $fixed_line . $good;
			}

			if (($#elements % 2) == 0) {
				$fixed_line = $fixed_line . $fix_elements[$#elements];
			}

			if ($fix && $line_fixed && $fixed_line ne $fixed[$fixlinenr]) {
				$fixed[$fixlinenr] = $fixed_line;
			}


		}

# check for whitespace before a non-naked semicolon
		if ($line =~ /^\+.*\S\s+;\s*$/) {
			if (WARN("SPACING",
				 "space prohibited before semicolon\n" . $herecurr) &&
			    $fix) {
				1 while $fixed[$fixlinenr] =~
				    s/^(\+.*\S)\s+;/$1;/;
			}
		}

# check for multiple assignments
		if ($line =~ /^.\s*$Lval\s*=\s*$Lval\s*=(?!=)/) {
			CHK("MULTIPLE_ASSIGNMENTS",
			    "multiple assignments should be avoided\n" . $herecurr);
		}

## # check for multiple declarations, allowing for a function declaration
## # continuation.
## 		if ($line =~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Ident.*/ &&
## 		    $line !~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Type\s*$Ident.*/) {
##
## 			# Remove any bracketed sections to ensure we do not
## 			# falsly report the parameters of functions.
## 			my $ln = $line;
## 			while ($ln =~ s/\([^\(\)]*\)//g) {
## 			}
## 			if ($ln =~ /,/) {
## 				WARN("MULTIPLE_DECLARATION",
##				     "declaring multiple variables together should be avoided\n" . $herecurr);
## 			}
## 		}

#need space before brace following if, while, etc
		if (($line =~ /\(.*\)\{/ && $line !~ /\($Type\)\{/) ||
		    $line =~ /do\{/) {
			if (ERROR("SPACING",
				  "space required before the open brace '{'\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/^(\+.*(?:do|\)))\{/$1 {/;
			}
		}

## # check for blank lines before declarations
##		if ($line =~ /^.\t+$Type\s+$Ident(?:\s*=.*)?;/ &&
##		    $prevrawline =~ /^.\s*$/) {
##			WARN("SPACING",
##			     "No blank lines before declarations\n" . $hereprev);
##		}
##

# closing brace should have a space following it when it has anything
# on the line
		if ($line =~ /}(?!(?:,|;|\)))\S/) {
			if (ERROR("SPACING",
				  "space required after that close brace '}'\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~
				    s/}((?!(?:,|;|\)))\S)/} $1/;
			}
		}

# check spacing on square brackets
		if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
			if (ERROR("SPACING",
				  "space prohibited after that open square bracket '['\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~
				    s/\[\s+/\[/;
			}
		}
		if ($line =~ /\s\]/) {
			if (ERROR("SPACING",
				  "space prohibited before that close square bracket ']'\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~
				    s/\s+\]/\]/;
			}
		}

# check spacing on parentheses
		if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
		    $line !~ /for\s*\(\s+;/) {
			if (ERROR("SPACING",
				  "space prohibited after that open parenthesis '('\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~
				    s/\(\s+/\(/;
			}
		}
		if ($line =~ /(\s+)\)/ && $line !~ /^.\s*\)/ &&
		    $line !~ /for\s*\(.*;\s+\)/ &&
		    $line !~ /:\s+\)/) {
			if (ERROR("SPACING",
				  "space prohibited before that close parenthesis ')'\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~
				    s/\s+\)/\)/;
			}
		}

# check unnecessary parentheses around addressof/dereference single $Lvals
# ie: &(foo->bar) should be &foo->bar and *(foo->bar) should be *foo->bar

		while ($line =~ /(?:[^&]&\s*|\*)\(\s*($Ident\s*(?:$Member\s*)+)\s*\)/g) {
			my $var = $1;
			if (CHK("UNNECESSARY_PARENTHESES",
				"Unnecessary parentheses around $var\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/\(\s*\Q$var\E\s*\)/$var/;
			}
		}

# check for unnecessary parentheses around function pointer uses
# ie: (foo->bar)(); should be foo->bar();
# but not "if (foo->bar) (" to avoid some false positives
		if ($line =~ /(\bif\s*|)(\(\s*$Ident\s*(?:$Member\s*)+\))[ \t]*\(/ && $1 !~ /^if/) {
			my $var = $2;
			if (CHK("UNNECESSARY_PARENTHESES",
				"Unnecessary parentheses around function pointer $var\n" . $herecurr) &&
			    $fix) {
				my $var2 = deparenthesize($var);
				$var2 =~ s/\s//g;
				$fixed[$fixlinenr] =~ s/\Q$var\E/$var2/;
			}
		}

# check for unnecessary parentheses around comparisons in if uses
		if ($^V && $^V ge 5.10.0 && defined($stat) &&
		    $stat =~ /(^.\s*if\s*($balanced_parens))/) {
			my $if_stat = $1;
			my $test = substr($2, 1, -1);
			my $herectx;
			while ($test =~ /(?:^|[^\w\&\!\~])+\s*\(\s*([\&\!\~]?\s*$Lval\s*(?:$Compare\s*$FuncArg)?)\s*\)/g) {
				my $match = $1;
				# avoid parentheses around potential macro args
				next if ($match =~ /^\s*\w+\s*$/);
				if (!defined($herectx)) {
					$herectx = $here . "\n";
					my $cnt = statement_rawlines($if_stat);
					for (my $n = 0; $n < $cnt; $n++) {
						my $rl = raw_line($linenr, $n);
						$herectx .=  $rl . "\n";
						last if $rl =~ /^[ \+].*\{/;
					}
				}
				CHK("UNNECESSARY_PARENTHESES",
				    "Unnecessary parentheses around '$match'\n" . $herectx);
			}
		}

# return is not a function
		if (defined($stat) && $stat =~ /^.\s*return(\s*)\(/s) {
			my $spacing = $1;
			if ($^V && $^V ge 5.10.0 &&
			    $stat =~ /^.\s*return\s*($balanced_parens)\s*;\s*$/) {
				my $value = $1;
				$value = deparenthesize($value);
				if ($value =~ m/^\s*$FuncArg\s*(?:\?|$)/) {
					ERROR("RETURN_PARENTHESES",
					      "return is not a function, parentheses are not required\n" . $herecurr);
				}
			} elsif ($spacing !~ /\s+/) {
				ERROR("SPACING",
				      "space required before the open parenthesis '('\n" . $herecurr);
			}
		}

# unnecessary return in a void function
# at end-of-function, with the previous line a single leading tab, then return;
# and the line before that not a goto label target like "out:"
		if ($sline =~ /^[ \+]}\s*$/ &&
		    $prevline =~ /^\+\treturn\s*;\s*$/ &&
		    $linenr >= 3 &&
		    $lines[$linenr - 3] =~ /^[ +]/ &&
		    $lines[$linenr - 3] !~ /^[ +]\s*$Ident\s*:/) {
			WARN("RETURN_VOID",
			     "void function return statements are not generally useful\n" . $hereprev);
               }

# if statements using unnecessary parentheses - ie: if ((foo == bar))
		if ($^V && $^V ge 5.10.0 &&
		    $line =~ /\bif\s*((?:\(\s*){2,})/) {
			my $openparens = $1;
			my $count = $openparens =~ tr@\(@\(@;
			my $msg = "";
			if ($line =~ /\bif\s*(?:\(\s*){$count,$count}$LvalOrFunc\s*($Compare)\s*$LvalOrFunc(?:\s*\)){$count,$count}/) {
				my $comp = $4;	#Not $1 because of $LvalOrFunc
				$msg = " - maybe == should be = ?" if ($comp eq "==");
				WARN("UNNECESSARY_PARENTHESES",
				     "Unnecessary parentheses$msg\n" . $herecurr);
			}
		}

# comparisons with a constant or upper case identifier on the left
#	avoid cases like "foo + BAR < baz"
#	only fix matches surrounded by parentheses to avoid incorrect
#	conversions like "FOO < baz() + 5" being "misfixed" to "baz() > FOO + 5"
		if ($^V && $^V ge 5.10.0 &&
		    $line =~ /^\+(.*)\b($Constant|[A-Z_][A-Z0-9_]*)\s*($Compare)\s*($LvalOrFunc)/) {
			my $lead = $1;
			my $const = $2;
			my $comp = $3;
			my $to = $4;
			my $newcomp = $comp;
			if ($lead !~ /(?:$Operators|\.)\s*$/ &&
			    $to !~ /^(?:Constant|[A-Z_][A-Z0-9_]*)$/ &&
			    WARN("CONSTANT_COMPARISON",
				 "Comparisons should place the constant on the right side of the test\n" . $herecurr) &&
			    $fix) {
				if ($comp eq "<") {
					$newcomp = ">";
				} elsif ($comp eq "<=") {
					$newcomp = ">=";
				} elsif ($comp eq ">") {
					$newcomp = "<";
				} elsif ($comp eq ">=") {
					$newcomp = "<=";
				}
				$fixed[$fixlinenr] =~ s/\(\s*\Q$const\E\s*$Compare\s*\Q$to\E\s*\)/($to $newcomp $const)/;
			}
		}

# Return of what appears to be an errno should normally be negative
		if ($sline =~ /\breturn(?:\s*\(+\s*|\s+)(E[A-Z]+)(?:\s*\)+\s*|\s*)[;:,]/) {
			my $name = $1;
			if ($name ne 'EOF' && $name ne 'ERROR') {
				WARN("USE_NEGATIVE_ERRNO",
				     "return of an errno should typically be negative (ie: return -$1)\n" . $herecurr);
			}
		}

# Need a space before open parenthesis after if, while etc
		if ($line =~ /\b(if|while|for|switch)\(/) {
			if (ERROR("SPACING",
				  "space required before the open parenthesis '('\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~
				    s/\b(if|while|for|switch)\(/$1 \(/;
			}
		}

# Check for illegal assignment in if conditional -- and check for trailing
# statements after the conditional.
		if ($line =~ /do\s*(?!{)/) {
			($stat, $cond, $line_nr_next, $remain_next, $off_next) =
				ctx_statement_block($linenr, $realcnt, 0)
					if (!defined $stat);
			my ($stat_next) = ctx_statement_block($line_nr_next,
						$remain_next, $off_next);
			$stat_next =~ s/\n./\n /g;
			##print "stat<$stat> stat_next<$stat_next>\n";

			if ($stat_next =~ /^\s*while\b/) {
				# If the statement carries leading newlines,
				# then count those as offsets.
				my ($whitespace) =
					($stat_next =~ /^((?:\s*\n[+-])*\s*)/s);
				my $offset =
					statement_rawlines($whitespace) - 1;

				$suppress_whiletrailers{$line_nr_next +
								$offset} = 1;
			}
		}
		if (!defined $suppress_whiletrailers{$linenr} &&
		    defined($stat) && defined($cond) &&
		    $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
			my ($s, $c) = ($stat, $cond);

			if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
				ERROR("ASSIGN_IN_IF",
				      "do not use assignment in if condition\n" . $herecurr);
			}

			# Find out what is on the end of the line after the
			# conditional.
			substr($s, 0, length($c), '');
			$s =~ s/\n.*//g;
			$s =~ s/$;//g; 	# Remove any comments
			if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ &&
			    $c !~ /}\s*while\s*/)
			{
				# Find out how long the conditional actually is.
				my @newlines = ($c =~ /\n/gs);
				my $cond_lines = 1 + $#newlines;
				my $stat_real = '';

				$stat_real = raw_line($linenr, $cond_lines)
							. "\n" if ($cond_lines);
				if (defined($stat_real) && $cond_lines > 1) {
					$stat_real = "[...]\n$stat_real";
				}

				ERROR("TRAILING_STATEMENTS",
				      "trailing statements should be on next line\n" . $herecurr . $stat_real);
			}
		}

# Check for bitwise tests written as boolean
		if ($line =~ /
			(?:
				(?:\[|\(|\&\&|\|\|)
				\s*0[xX][0-9]+\s*
				(?:\&\&|\|\|)
			|
				(?:\&\&|\|\|)
				\s*0[xX][0-9]+\s*
				(?:\&\&|\|\||\)|\])
			)/x)
		{
			WARN("HEXADECIMAL_BOOLEAN_TEST",
			     "boolean test with hexadecimal, perhaps just 1 \& or \|?\n" . $herecurr);
		}

# if and else should not have general statements after it
		if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/) {
			my $s = $1;
			$s =~ s/$;//g; 	# Remove any comments
			if ($s !~ /^\s*(?:\sif|(?:{|)\s*\\?\s*$)/) {
				ERROR("TRAILING_STATEMENTS",
				      "trailing statements should be on next line\n" . $herecurr);
			}
		}
# if should not continue a brace
		if ($line =~ /}\s*if\b/) {
			ERROR("TRAILING_STATEMENTS",
			      "trailing statements should be on next line (or did you mean 'else if'?)\n" .
				$herecurr);
		}
# case and default should not have general statements after them
		if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
		    $line !~ /\G(?:
			(?:\s*$;*)(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
			\s*return\s+
		    )/xg)
		{
			ERROR("TRAILING_STATEMENTS",
			      "trailing statements should be on next line\n" . $herecurr);
		}

		# Check for }<nl>else {, these must be at the same
		# indent level to be relevant to each other.
		if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ &&
		    $previndent == $indent) {
			if (ERROR("ELSE_AFTER_BRACE",
				  "else should follow close brace '}'\n" . $hereprev) &&
			    $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
				fix_delete_line($fixlinenr - 1, $prevrawline);
				fix_delete_line($fixlinenr, $rawline);
				my $fixedline = $prevrawline;
				$fixedline =~ s/}\s*$//;
				if ($fixedline !~ /^\+\s*$/) {
					fix_insert_line($fixlinenr, $fixedline);
				}
				$fixedline = $rawline;
				$fixedline =~ s/^(.\s*)else/$1} else/;
				fix_insert_line($fixlinenr, $fixedline);
			}
		}

		if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ &&
		    $previndent == $indent) {
			my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0);

			# Find out what is on the end of the line after the
			# conditional.
			substr($s, 0, length($c), '');
			$s =~ s/\n.*//g;

			if ($s =~ /^\s*;/) {
				if (ERROR("WHILE_AFTER_BRACE",
					  "while should follow close brace '}'\n" . $hereprev) &&
				    $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
					fix_delete_line($fixlinenr - 1, $prevrawline);
					fix_delete_line($fixlinenr, $rawline);
					my $fixedline = $prevrawline;
					my $trailing = $rawline;
					$trailing =~ s/^\+//;
					$trailing = trim($trailing);
					$fixedline =~ s/}\s*$/} $trailing/;
					fix_insert_line($fixlinenr, $fixedline);
				}
			}
		}

#Specific variable tests
		while ($line =~ m{($Constant|$Lval)}g) {
			my $var = $1;

#gcc binary extension
			if ($var =~ /^$Binary$/) {
				if (WARN("GCC_BINARY_CONSTANT",
					 "Avoid gcc v4.3+ binary constant extension: <$var>\n" . $herecurr) &&
				    $fix) {
					my $hexval = sprintf("0x%x", oct($var));
					$fixed[$fixlinenr] =~
					    s/\b$var\b/$hexval/;
				}
			}

#CamelCase
			if ($var !~ /^$Constant$/ &&
			    $var =~ /[A-Z][a-z]|[a-z][A-Z]/ &&
#Ignore Page<foo> variants
			    $var !~ /^(?:Clear|Set|TestClear|TestSet|)Page[A-Z]/ &&
#Ignore SI style variants like nS, mV and dB (ie: max_uV, regulator_min_uA_show)
			    $var !~ /^(?:[a-z_]*?)_?[a-z][A-Z](?:_[a-z_]+)?$/ &&
#Ignore some three character SI units explicitly, like MiB and KHz
			    $var !~ /^(?:[a-z_]*?)_?(?:[KMGT]iB|[KMGT]?Hz)(?:_[a-z_]+)?$/) {
				while ($var =~ m{($Ident)}g) {
					my $word = $1;
					next if ($word !~ /[A-Z][a-z]|[a-z][A-Z]/);
					if ($check) {
						seed_camelcase_includes();
						if (!$file && !$camelcase_file_seeded) {
							seed_camelcase_file($realfile);
							$camelcase_file_seeded = 1;
						}
					}
					if (!defined $camelcase{$word}) {
						$camelcase{$word} = 1;
						CHK("CAMELCASE",
						    "Avoid CamelCase: <$word>\n" . $herecurr);
					}
				}
			}
		}

#no spaces allowed after \ in define
		if ($line =~ /\#\s*define.*\\\s+$/) {
			if (WARN("WHITESPACE_AFTER_LINE_CONTINUATION",
				 "Whitespace after \\ makes next lines useless\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/\s+$//;
			}
		}

# warn if <asm/foo.h> is #included and <linux/foo.h> is available and includes
# itself <asm/foo.h> (uses RAW line)
		if ($tree && $rawline =~ m{^.\s*\#\s*include\s*\<asm\/(.*)\.h\>}) {
			my $file = "$1.h";
			my $checkfile = "include/linux/$file";
			if (-f "$root/$checkfile" &&
			    $realfile ne $checkfile &&
			    $1 !~ /$allowed_asm_includes/)
			{
				my $asminclude = `grep -Ec "#include\\s+<asm/$file>" $root/$checkfile`;
				if ($asminclude > 0) {
					if ($realfile =~ m{^arch/}) {
						CHK("ARCH_INCLUDE_LINUX",
						    "Consider using #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
					} else {
						WARN("INCLUDE_LINUX",
						     "Use #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
					}
				}
			}
		}

# multi-statement macros should be enclosed in a do while loop, grab the
# first statement and ensure its the whole macro if its not enclosed
# in a known good container
		if ($realfile !~ m@/vmlinux.lds.h$@ &&
		    $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
			my $ln = $linenr;
			my $cnt = $realcnt;
			my ($off, $dstat, $dcond, $rest);
			my $ctx = '';
			my $has_flow_statement = 0;
			my $has_arg_concat = 0;
			my $complex = 0;
			($dstat, $dcond, $ln, $cnt, $off) =
				ctx_statement_block($linenr, $realcnt, 0);
			$ctx = $dstat;
			#print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
			#print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";

			$has_flow_statement = 1 if ($ctx =~ /\b(goto|return)\b/);
			$has_arg_concat = 1 if ($ctx =~ /\#\#/ && $ctx !~ /\#\#\s*(?:__VA_ARGS__|args)\b/);

			$dstat =~ s/^.\s*\#\s*define\s+$Ident(\([^\)]*\))?\s*//;
			my $define_args = $1;
			my $define_stmt = $dstat;
			my @def_args = ();

			if (defined $define_args && $define_args ne "") {
				$define_args = substr($define_args, 1, length($define_args) - 2);
				$define_args =~ s/\s*//g;
				@def_args = split(",", $define_args);
				$complex = 1;
			}

			$dstat =~ s/$;//g;
			$dstat =~ s/\\\n.//g;
			$dstat =~ s/^\s*//s;
			$dstat =~ s/\s*$//s;

			# Flatten any parentheses and braces
			while ($dstat =~ s/\([^\(\)]*\)/1/ ||
			       $dstat =~ s/\{[^\{\}]*\}/1/ ||
			       $dstat =~ s/.\[[^\[\]]*\]/1/)
			{
			}

			# Flatten any obvious string concatentation.
			while ($dstat =~ s/($String)\s*$Ident/$1/ ||
			       $dstat =~ s/$Ident\s*($String)/$1/)
			{
			}

			# Make asm volatile uses seem like a generic function
			$dstat =~ s/\b_*asm_*\s+_*volatile_*\b/asm_volatile/g;

			my $exceptions = qr{
				$Declare|
				module_param_named|
				MODULE_PARM_DESC|
				DECLARE_PER_CPU|
				DEFINE_PER_CPU|
				__typeof__\(|
				union|
				struct|
				\.$Ident\s*=\s*|
				^\"|\"$|
				^\[
			}x;
			#print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";

			$ctx =~ s/\n*$//;
			my $herectx = $here . "\n";
			my $stmt_cnt = statement_rawlines($ctx);

			for (my $n = 0; $n < $stmt_cnt; $n++) {
				$herectx .= raw_line($linenr, $n) . "\n";
			}

			if ($dstat ne '' &&
			    $dstat !~ /^(?:$Ident|-?$Constant),$/ &&			# 10, // foo(),
			    $dstat !~ /^(?:$Ident|-?$Constant);$/ &&			# foo();
			    $dstat !~ /^[!~-]?(?:$Lval|$Constant)$/ &&		# 10 // foo() // !foo // ~foo // -foo // foo->bar // foo.bar->baz
			    $dstat !~ /^'X'$/ && $dstat !~ /^'XX'$/ &&			# character constants
			    $dstat !~ /$exceptions/ &&
			    $dstat !~ /^\.$Ident\s*=/ &&				# .foo =
			    $dstat !~ /^(?:\#\s*$Ident|\#\s*$Constant)\s*$/ &&		# stringification #foo
			    $dstat !~ /^do\s*$Constant\s*while\s*$Constant;?$/ &&	# do {...} while (...); // do {...} while (...)
			    $dstat !~ /^for\s*$Constant$/ &&				# for (...)
			    $dstat !~ /^for\s*$Constant\s+(?:$Ident|-?$Constant)$/ &&	# for (...) bar()
			    $dstat !~ /^do\s*{/ &&					# do {...
			    $dstat !~ /^\(\{/ &&						# ({...
			    $ctx !~ /^.\s*#\s*define\s+TRACE_(?:SYSTEM|INCLUDE_FILE|INCLUDE_PATH)\b/)
			{
				if ($dstat =~ /^\s*if\b/) {
					ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
					      "Macros starting with if should be enclosed by a do - while loop to avoid possible if/else logic defects\n" . "$herectx");
				} elsif ($dstat =~ /;/) {
					ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
					      "Macros with multiple statements should be enclosed in a do - while loop\n" . "$herectx");
				} elsif ($complex) {
					ERROR("COMPLEX_MACRO",
					      "Macros with complex values should be enclosed in parentheses\n" . "$herectx");
				}

			}

			# Make $define_stmt single line, comment-free, etc
			my @stmt_array = split('\n', $define_stmt);
			my $first = 1;
			$define_stmt = "";
			foreach my $l (@stmt_array) {
				$l =~ s/\\$//;
				if ($first) {
					$define_stmt = $l;
					$first = 0;
				} elsif ($l =~ /^[\+ ]/) {
					$define_stmt .= substr($l, 1);
				}
			}
			$define_stmt =~ s/$;//g;
			$define_stmt =~ s/\s+/ /g;
			$define_stmt = trim($define_stmt);

# check if any macro arguments are reused (ignore '...' and 'type')
			foreach my $arg (@def_args) {
			        next if ($arg =~ /\.\.\./);
			        next if ($arg =~ /^type$/i);
				my $tmp_stmt = $define_stmt;
				$tmp_stmt =~ s/\b(typeof|__typeof__|__builtin\w+|typecheck\s*\(\s*$Type\s*,|\#+)\s*\(*\s*$arg\s*\)*\b//g;
				$tmp_stmt =~ s/\#+\s*$arg\b//g;
				$tmp_stmt =~ s/\b$arg\s*\#\#//g;
				my $use_cnt = $tmp_stmt =~ s/\b$arg\b//g;
				if ($use_cnt > 1) {
					CHK("MACRO_ARG_REUSE",
					    "Macro argument reuse '$arg' - possible side-effects?\n" . "$herectx");
				    }
# check if any macro arguments may have other precedence issues
				if ($tmp_stmt =~ m/($Operators)?\s*\b$arg\b\s*($Operators)?/m &&
				    ((defined($1) && $1 ne ',') ||
				     (defined($2) && $2 ne ','))) {
					CHK("MACRO_ARG_PRECEDENCE",
					    "Macro argument '$arg' may be better as '($arg)' to avoid precedence issues\n" . "$herectx");
				}
			}

# check for macros with flow control, but without ## concatenation
# ## concatenation is commonly a macro that defines a function so ignore those
			if ($has_flow_statement && !$has_arg_concat) {
				my $herectx = $here . "\n";
				my $cnt = statement_rawlines($ctx);

				for (my $n = 0; $n < $cnt; $n++) {
					$herectx .= raw_line($linenr, $n) . "\n";
				}
				WARN("MACRO_WITH_FLOW_CONTROL",
				     "Macros with flow control statements should be avoided\n" . "$herectx");
			}

# check for line continuations outside of #defines, preprocessor #, and asm

		} else {
			if ($prevline !~ /^..*\\$/ &&
			    $line !~ /^\+\s*\#.*\\$/ &&		# preprocessor
			    $line !~ /^\+.*\b(__asm__|asm)\b.*\\$/ &&	# asm
			    $line =~ /^\+.*\\$/) {
				WARN("LINE_CONTINUATIONS",
				     "Avoid unnecessary line continuations\n" . $herecurr);
			}
		}

# do {} while (0) macro tests:
# single-statement macros do not need to be enclosed in do while (0) loop,
# macro should not end with a semicolon
		if ($^V && $^V ge 5.10.0 &&
		    $realfile !~ m@/vmlinux.lds.h$@ &&
		    $line =~ /^.\s*\#\s*define\s+$Ident(\()?/) {
			my $ln = $linenr;
			my $cnt = $realcnt;
			my ($off, $dstat, $dcond, $rest);
			my $ctx = '';
			($dstat, $dcond, $ln, $cnt, $off) =
				ctx_statement_block($linenr, $realcnt, 0);
			$ctx = $dstat;

			$dstat =~ s/\\\n.//g;
			$dstat =~ s/$;/ /g;

			if ($dstat =~ /^\+\s*#\s*define\s+$Ident\s*${balanced_parens}\s*do\s*{(.*)\s*}\s*while\s*\(\s*0\s*\)\s*([;\s]*)\s*$/) {
				my $stmts = $2;
				my $semis = $3;

				$ctx =~ s/\n*$//;
				my $cnt = statement_rawlines($ctx);
				my $herectx = $here . "\n";

				for (my $n = 0; $n < $cnt; $n++) {
					$herectx .= raw_line($linenr, $n) . "\n";
				}

				if (($stmts =~ tr/;/;/) == 1 &&
				    $stmts !~ /^\s*(if|while|for|switch)\b/) {
					WARN("SINGLE_STATEMENT_DO_WHILE_MACRO",
					     "Single statement macros should not use a do {} while (0) loop\n" . "$herectx");
				}
				if (defined $semis && $semis ne "") {
					WARN("DO_WHILE_MACRO_WITH_TRAILING_SEMICOLON",
					     "do {} while (0) macros should not be semicolon terminated\n" . "$herectx");
				}
			} elsif ($dstat =~ /^\+\s*#\s*define\s+$Ident.*;\s*$/) {
				$ctx =~ s/\n*$//;
				my $cnt = statement_rawlines($ctx);
				my $herectx = $here . "\n";

				for (my $n = 0; $n < $cnt; $n++) {
					$herectx .= raw_line($linenr, $n) . "\n";
				}

				WARN("TRAILING_SEMICOLON",
				     "macros should not use a trailing semicolon\n" . "$herectx");
			}
		}

# make sure symbols are always wrapped with VMLINUX_SYMBOL() ...
# all assignments may have only one of the following with an assignment:
#	.
#	ALIGN(...)
#	VMLINUX_SYMBOL(...)
		if ($realfile eq 'vmlinux.lds.h' && $line =~ /(?:(?:^|\s)$Ident\s*=|=\s*$Ident(?:\s|$))/) {
			WARN("MISSING_VMLINUX_SYMBOL",
			     "vmlinux.lds.h needs VMLINUX_SYMBOL() around C-visible symbols\n" . $herecurr);
		}

# check for redundant bracing round if etc
		if ($line =~ /(^.*)\bif\b/ && $1 !~ /else\s*$/) {
			my ($level, $endln, @chunks) =
				ctx_statement_full($linenr, $realcnt, 1);
			#print "chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
			#print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n";
			if ($#chunks > 0 && $level == 0) {
				my @allowed = ();
				my $allow = 0;
				my $seen = 0;
				my $herectx = $here . "\n";
				my $ln = $linenr - 1;
				for my $chunk (@chunks) {
					my ($cond, $block) = @{$chunk};

					# If the condition carries leading newlines, then count those as offsets.
					my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
					my $offset = statement_rawlines($whitespace) - 1;

					$allowed[$allow] = 0;
					#print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";

					# We have looked at and allowed this specific line.
					$suppress_ifbraces{$ln + $offset} = 1;

					$herectx .= "$rawlines[$ln + $offset]\n[...]\n";
					$ln += statement_rawlines($block) - 1;

					substr($block, 0, length($cond), '');

					$seen++ if ($block =~ /^\s*{/);

					#print "cond<$cond> block<$block> allowed<$allowed[$allow]>\n";
					if (statement_lines($cond) > 1) {
						#print "APW: ALLOWED: cond<$cond>\n";
						$allowed[$allow] = 1;
					}
					if ($block =~/\b(?:if|for|while)\b/) {
						#print "APW: ALLOWED: block<$block>\n";
						$allowed[$allow] = 1;
					}
					if (statement_block_size($block) > 1) {
						#print "APW: ALLOWED: lines block<$block>\n";
						$allowed[$allow] = 1;
					}
					$allow++;
				}
				if ($seen) {
					my $sum_allowed = 0;
					foreach (@allowed) {
						$sum_allowed += $_;
					}
					if ($sum_allowed == 0) {
						WARN("BRACES",
						     "braces {} are not necessary for any arm of this statement\n" . $herectx);
					} elsif ($sum_allowed != $allow &&
						 $seen != $allow) {
						CHK("BRACES",
						    "braces {} should be used on all arms of this statement\n" . $herectx);
					}
				}
			}
		}
		if (!defined $suppress_ifbraces{$linenr - 1} &&
					$line =~ /\b(if|while|for|else)\b/) {
			my $allowed = 0;

			# Check the pre-context.
			if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
				#print "APW: ALLOWED: pre<$1>\n";
				$allowed = 1;
			}

			my ($level, $endln, @chunks) =
				ctx_statement_full($linenr, $realcnt, $-[0]);

			# Check the condition.
			my ($cond, $block) = @{$chunks[0]};
			#print "CHECKING<$linenr> cond<$cond> block<$block>\n";
			if (defined $cond) {
				substr($block, 0, length($cond), '');
			}
			if (statement_lines($cond) > 1) {
				#print "APW: ALLOWED: cond<$cond>\n";
				$allowed = 1;
			}
			if ($block =~/\b(?:if|for|while)\b/) {
				#print "APW: ALLOWED: block<$block>\n";
				$allowed = 1;
			}
			if (statement_block_size($block) > 1) {
				#print "APW: ALLOWED: lines block<$block>\n";
				$allowed = 1;
			}
			# Check the post-context.
			if (defined $chunks[1]) {
				my ($cond, $block) = @{$chunks[1]};
				if (defined $cond) {
					substr($block, 0, length($cond), '');
				}
				if ($block =~ /^\s*\{/) {
					#print "APW: ALLOWED: chunk-1 block<$block>\n";
					$allowed = 1;
				}
			}
			if ($level == 0 && $block =~ /^\s*\{/ && !$allowed) {
				my $herectx = $here . "\n";
				my $cnt = statement_rawlines($block);

				for (my $n = 0; $n < $cnt; $n++) {
					$herectx .= raw_line($linenr, $n) . "\n";
				}

				WARN("BRACES",
				     "braces {} are not necessary for single statement blocks\n" . $herectx);
			}
		}

		if (!defined $suppress_ifbraces{$linenr - 1} &&
					$line =~ /\b(frr_with_)/) {
			my ($level, $endln, @chunks) =
				ctx_statement_full($linenr, $realcnt, $-[0]);

			# Check the condition.
			my ($cond, $block) = @{$chunks[0]};
			#print "CHECKING<$linenr> cond<$cond> block<$block>\n";
			if (defined $cond) {
				substr($block, 0, length($cond), '');
			}

			if ($level == 0 && $block !~ /^\s*\{/) {
				my $herectx = $here . "\n";
				my $cnt = statement_rawlines($block);

				for (my $n = 0; $n < $cnt; $n++) {
					$herectx .= raw_line($linenr, $n) . "\n";
				}

				WARN("BRACES",
				     "braces {} are mandatory for frr_with_* blocks\n" . $herectx);
			}
		}

# check for single line unbalanced braces
		if ($sline =~ /^.\s*\}\s*else\s*$/ ||
		    $sline =~ /^.\s*else\s*\{\s*$/) {
			CHK("BRACES", "Unbalanced braces around else statement\n" . $herecurr);
		}

# check for unnecessary blank lines around braces
		if (($line =~ /^.\s*}\s*$/ && $prevrawline =~ /^.\s*$/)) {
			if (CHK("BRACES",
				"Blank lines aren't necessary before a close brace '}'\n" . $hereprev) &&
			    $fix && $prevrawline =~ /^\+/) {
				fix_delete_line($fixlinenr - 1, $prevrawline);
			}
		}
		if (($rawline =~ /^.\s*$/ && $prevline =~ /^..*{\s*$/)) {
			if (CHK("BRACES",
				"Blank lines aren't necessary after an open brace '{'\n" . $hereprev) &&
			    $fix) {
				fix_delete_line($fixlinenr, $rawline);
			}
		}

# no volatiles please
		my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b};
		if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) {
			WARN("VOLATILE",
			     "Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst\n" . $herecurr);
		}

# Check for user-visible strings broken across lines, which breaks the ability
# to grep for the string.  Make exceptions when the previous string ends in a
# newline (multiple lines in one string constant) or '\t', '\r', ';', or '{'
# (common in inline assembly) or is a octal \123 or hexadecimal \xaf value
		if ($line =~ /^\+\s*$String/ &&
		    $prevline =~ /"\s*$/ &&
		    $prevrawline !~ /(?:\\(?:[ntr]|[0-7]{1,3}|x[0-9a-fA-F]{1,2})|;\s*|\{\s*)"\s*$/) {
			if (WARN("SPLIT_STRING",
				 "quoted string split across lines\n" . $hereprev) &&
				     $fix &&
				     $prevrawline =~ /^\+.*"\s*$/ &&
				     $last_coalesced_string_linenr != $linenr - 1) {
				my $extracted_string = get_quoted_string($line, $rawline);
				my $comma_close = "";
				if ($rawline =~ /\Q$extracted_string\E(\s*\)\s*;\s*$|\s*,\s*)/) {
					$comma_close = $1;
				}

				fix_delete_line($fixlinenr - 1, $prevrawline);
				fix_delete_line($fixlinenr, $rawline);
				my $fixedline = $prevrawline;
				$fixedline =~ s/"\s*$//;
				$fixedline .= substr($extracted_string, 1) . trim($comma_close);
				fix_insert_line($fixlinenr - 1, $fixedline);
				$fixedline = $rawline;
				$fixedline =~ s/\Q$extracted_string\E\Q$comma_close\E//;
				if ($fixedline !~ /\+\s*$/) {
					fix_insert_line($fixlinenr, $fixedline);
				}
				$last_coalesced_string_linenr = $linenr;
			}
		}

# check for missing a space in a string concatenation
		if ($prevrawline =~ /[^\\]\w"$/ && $rawline =~ /^\+[\t ]+"\w/) {
			WARN('MISSING_SPACE',
			     "break quoted strings at a space character\n" . $hereprev);
		}

# check for an embedded function name in a string when the function is known
# This does not work very well for -f --file checking as it depends on patch
# context providing the function name or a single line form for in-file
# function declarations
		if ($line =~ /^\+.*$String/ &&
		    defined($context_function) &&
		    get_quoted_string($line, $rawline) =~ /\b$context_function\b/ &&
		    length(get_quoted_string($line, $rawline)) != (length($context_function) + 2)) {
			WARN("EMBEDDED_FUNCTION_NAME",
			     "Prefer using '\"%s...\", __func__' to using '$context_function', this function's name, in a string\n" . $herecurr);
		}

# check for spaces before a quoted newline
		if ($rawline =~ /^.*\".*\s\\n/) {
			if (WARN("QUOTED_WHITESPACE_BEFORE_NEWLINE",
				 "unnecessary whitespace before a quoted newline\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/^(\+.*\".*)\s+\\n/$1\\n/;
			}

		}

# concatenated string without spaces between elements
		if ($line =~ /$String[A-Z_]/ || $line =~ /[A-Za-z0-9_]$String/) {
			CHK("CONCATENATED_STRING",
			    "Concatenated strings should use spaces between elements\n" . $herecurr);
		}

# uncoalesced string fragments
		if ($line =~ /$String\s*"/) {
			CHK("STRING_FRAGMENTS",
			    "Consecutive strings are generally better as a single string\n" . $herecurr);
		}

# check for non-standard and hex prefixed decimal printf formats
		my $show_L = 1;	#don't show the same defect twice
		my $show_Z = 1;
		while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
			my $string = substr($rawline, $-[1], $+[1] - $-[1]);
			$string =~ s/%%/__/g;
			# check for %L
			if ($show_L && $string =~ /%[\*\d\.\$]*L([diouxX])/) {
				WARN("PRINTF_L",
				     "\%L$1 is non-standard C, use %ll$1\n" . $herecurr);
				$show_L = 0;
			}
			# check for %Z
			if ($show_Z && $string =~ /%[\*\d\.\$]*Z([diouxX])/) {
				WARN("PRINTF_Z",
				     "%Z$1 is non-standard C, use %z$1\n" . $herecurr);
				$show_Z = 0;
			}
			# check for 0x<decimal>
			if ($string =~ /0x%[\*\d\.\$\Llzth]*[diou]/) {
				ERROR("PRINTF_0XDECIMAL",
				      "Prefixing 0x with decimal output is defective\n" . $herecurr);
			}
		}

# check for line continuations in quoted strings with odd counts of "
		if ($rawline =~ /\\$/ && $rawline =~ tr/"/"/ % 2) {
			WARN("LINE_CONTINUATIONS",
			     "Avoid line continuations in quoted strings\n" . $herecurr);
		}

# warn about #if 0
		if ($line =~ /^.\s*\#\s*if\s+0\b/) {
			CHK("REDUNDANT_CODE",
			    "if this code is redundant consider removing it\n" .
				$herecurr);
		}

# check for needless "if (<foo>) fn(<foo>)" uses
		if ($prevline =~ /\bif\s*\(\s*($Lval)\s*\)/) {
			my $tested = quotemeta($1);
			my $expr = '\s*\(\s*' . $tested . '\s*\)\s*;';
			if ($line =~ /\b(kfree|usb_free_urb|debugfs_remove(?:_recursive)?|(?:kmem_cache|mempool|dma_pool)_destroy)$expr/) {
				my $func = $1;
				if (WARN('NEEDLESS_IF',
					 "$func(NULL) is safe and this check is probably not required\n" . $hereprev) &&
				    $fix) {
					my $do_fix = 1;
					my $leading_tabs = "";
					my $new_leading_tabs = "";
					if ($lines[$linenr - 2] =~ /^\+(\t*)if\s*\(\s*$tested\s*\)\s*$/) {
						$leading_tabs = $1;
					} else {
						$do_fix = 0;
					}
					if ($lines[$linenr - 1] =~ /^\+(\t+)$func\s*\(\s*$tested\s*\)\s*;\s*$/) {
						$new_leading_tabs = $1;
						if (length($leading_tabs) + 1 ne length($new_leading_tabs)) {
							$do_fix = 0;
						}
					} else {
						$do_fix = 0;
					}
					if ($do_fix) {
						fix_delete_line($fixlinenr - 1, $prevrawline);
						$fixed[$fixlinenr] =~ s/^\+$new_leading_tabs/\+$leading_tabs/;
					}
				}
			}
		}

# check for unnecessary "Out of Memory" messages
		if ($line =~ /^\+.*\b$logFunctions\s*\(/ &&
		    $prevline =~ /^[ \+]\s*if\s*\(\s*(\!\s*|NULL\s*==\s*)?($Lval)(\s*==\s*NULL\s*)?\s*\)/ &&
		    (defined $1 || defined $3) &&
		    $linenr > 3) {
			my $testval = $2;
			my $testline = $lines[$linenr - 3];

			my ($s, $c) = ctx_statement_block($linenr - 3, $realcnt, 0);
#			print("line: <$line>\nprevline: <$prevline>\ns: <$s>\nc: <$c>\n\n\n");

			if ($s =~ /(?:^|\n)[ \+]\s*(?:$Type\s*)?\Q$testval\E\s*=\s*(?:\([^\)]*\)\s*)?\s*(?:devm_)?(?:[kv][czm]alloc(?:_node|_array)?\b|kstrdup|kmemdup|(?:dev_)?alloc_skb)/) {
				WARN("OOM_MESSAGE",
				     "Possible unnecessary 'out of memory' message\n" . $hereprev);
			}
		}

# check for logging functions with KERN_<LEVEL>
		if ($line !~ /printk(?:_ratelimited|_once)?\s*\(/ &&
		    $line =~ /\b$logFunctions\s*\(.*\b(KERN_[A-Z]+)\b/) {
			my $level = $1;
			if (WARN("UNNECESSARY_KERN_LEVEL",
				 "Possible unnecessary $level\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/\s*$level\s*//;
			}
		}

# check for logging continuations
		if ($line =~ /\bprintk\s*\(\s*KERN_CONT\b|\bpr_cont\s*\(/) {
			WARN("LOGGING_CONTINUATION",
			     "Avoid logging continuation uses where feasible\n" . $herecurr);
		}

# check for mask then right shift without a parentheses
		if ($^V && $^V ge 5.10.0 &&
		    $line =~ /$LvalOrFunc\s*\&\s*($LvalOrFunc)\s*>>/ &&
		    $4 !~ /^\&/) { # $LvalOrFunc may be &foo, ignore if so
			WARN("MASK_THEN_SHIFT",
			     "Possible precedence defect with mask then right shift - may need parentheses\n" . $herecurr);
		}

# check for pointer comparisons to NULL
		if ($^V && $^V ge 5.10.0) {
			while ($line =~ /\b$LvalOrFunc\s*(==|\!=)\s*NULL\b/g) {
				my $val = $1;
				my $equal = "!";
				$equal = "" if ($4 eq "!=");
				if (CHK("COMPARISON_TO_NULL",
					"Comparison to NULL could be written \"${equal}${val}\"\n" . $herecurr) &&
					    $fix) {
					$fixed[$fixlinenr] =~ s/\b\Q$val\E\s*(?:==|\!=)\s*NULL\b/$equal$val/;
				}
			}
		}

# check for bad placement of section $InitAttribute (e.g.: __initdata)
		if ($line =~ /(\b$InitAttribute\b)/) {
			my $attr = $1;
			if ($line =~ /^\+\s*static\s+(?:const\s+)?(?:$attr\s+)?($NonptrTypeWithAttr)\s+(?:$attr\s+)?($Ident(?:\[[^]]*\])?)\s*[=;]/) {
				my $ptr = $1;
				my $var = $2;
				if ((($ptr =~ /\b(union|struct)\s+$attr\b/ &&
				      ERROR("MISPLACED_INIT",
					    "$attr should be placed after $var\n" . $herecurr)) ||
				     ($ptr !~ /\b(union|struct)\s+$attr\b/ &&
				      WARN("MISPLACED_INIT",
					   "$attr should be placed after $var\n" . $herecurr))) &&
				    $fix) {
					$fixed[$fixlinenr] =~ s/(\bstatic\s+(?:const\s+)?)(?:$attr\s+)?($NonptrTypeWithAttr)\s+(?:$attr\s+)?($Ident(?:\[[^]]*\])?)\s*([=;])\s*/"$1" . trim(string_find_replace($2, "\\s*$attr\\s*", " ")) . " " . trim(string_find_replace($3, "\\s*$attr\\s*", "")) . " $attr" . ("$4" eq ";" ? ";" : " = ")/e;
				}
			}
		}

# check for $InitAttributeData (ie: __initdata) with const
		if ($line =~ /\bconst\b/ && $line =~ /($InitAttributeData)/) {
			my $attr = $1;
			$attr =~ /($InitAttributePrefix)(.*)/;
			my $attr_prefix = $1;
			my $attr_type = $2;
			if (ERROR("INIT_ATTRIBUTE",
				  "Use of const init definition must use ${attr_prefix}initconst\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~
				    s/$InitAttributeData/${attr_prefix}initconst/;
			}
		}

# check for $InitAttributeConst (ie: __initconst) without const
		if ($line !~ /\bconst\b/ && $line =~ /($InitAttributeConst)/) {
			my $attr = $1;
			if (ERROR("INIT_ATTRIBUTE",
				  "Use of $attr requires a separate use of const\n" . $herecurr) &&
			    $fix) {
				my $lead = $fixed[$fixlinenr] =~
				    /(^\+\s*(?:static\s+))/;
				$lead = rtrim($1);
				$lead = "$lead " if ($lead !~ /^\+$/);
				$lead = "${lead}const ";
				$fixed[$fixlinenr] =~ s/(^\+\s*(?:static\s+))/$lead/;
			}
		}

# check for __read_mostly with const non-pointer (should just be const)
		if ($line =~ /\b__read_mostly\b/ &&
		    $line =~ /($Type)\s*$Ident/ && $1 !~ /\*\s*$/ && $1 =~ /\bconst\b/) {
			if (ERROR("CONST_READ_MOSTLY",
				  "Invalid use of __read_mostly with const type\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/\s+__read_mostly\b//;
			}
		}

# don't use __constant_<foo> functions outside of include/uapi/
		if ($realfile !~ m@^include/uapi/@ &&
		    $line =~ /(__constant_(?:htons|ntohs|[bl]e(?:16|32|64)_to_cpu|cpu_to_[bl]e(?:16|32|64)))\s*\(/) {
			my $constant_func = $1;
			my $func = $constant_func;
			$func =~ s/^__constant_//;
			if (WARN("CONSTANT_CONVERSION",
				 "$constant_func should be $func\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/\b$constant_func\b/$func/g;
			}
		}

# prefer usleep_range over udelay
		if ($line =~ /\budelay\s*\(\s*(\d+)\s*\)/) {
			my $delay = $1;
			# ignore udelay's < 10, however
			if (! ($delay < 10) ) {
				CHK("USLEEP_RANGE",
				    "usleep_range is preferred over udelay; see Documentation/timers/timers-howto.txt\n" . $herecurr);
			}
			if ($delay > 2000) {
				WARN("LONG_UDELAY",
				     "long udelay - prefer mdelay; see arch/arm/include/asm/delay.h\n" . $herecurr);
			}
		}

# warn about unexpectedly long msleep's
		if ($line =~ /\bmsleep\s*\((\d+)\);/) {
			if ($1 < 20) {
				WARN("MSLEEP",
				     "msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.txt\n" . $herecurr);
			}
		}

# check for comparisons of jiffies
		if ($line =~ /\bjiffies\s*$Compare|$Compare\s*jiffies\b/) {
			WARN("JIFFIES_COMPARISON",
			     "Comparing jiffies is almost always wrong; prefer time_after, time_before and friends\n" . $herecurr);
		}

# check for comparisons of get_jiffies_64()
		if ($line =~ /\bget_jiffies_64\s*\(\s*\)\s*$Compare|$Compare\s*get_jiffies_64\s*\(\s*\)/) {
			WARN("JIFFIES_COMPARISON",
			     "Comparing get_jiffies_64() is almost always wrong; prefer time_after64, time_before64 and friends\n" . $herecurr);
		}

# warn about #ifdefs in C files
#		if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
#			print "#ifdef in C files should be avoided\n";
#			print "$herecurr";
#			$clean = 0;
#		}

# warn about spacing in #ifdefs
		if ($line =~ /^.\s*\#\s*(ifdef|ifndef|elif)\s\s+/) {
			if (ERROR("SPACING",
				  "exactly one space required after that #$1\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~
				    s/^(.\s*\#\s*(ifdef|ifndef|elif))\s{2,}/$1 /;
			}

		}

# check for spinlock_t definitions without a comment.
		if ($line =~ /^.\s*(struct\s+mutex|spinlock_t)\s+\S+;/ ||
		    $line =~ /^.\s*(DEFINE_MUTEX)\s*\(/) {
			my $which = $1;
			if (!ctx_has_comment($first_line, $linenr)) {
				CHK("UNCOMMENTED_DEFINITION",
				    "$1 definition without comment\n" . $herecurr);
			}
		}
# check for memory barriers without a comment.

		my $barriers = qr{
			mb|
			rmb|
			wmb|
			read_barrier_depends
		}x;
		my $barrier_stems = qr{
			mb__before_atomic|
			mb__after_atomic|
			store_release|
			load_acquire|
			store_mb|
			(?:$barriers)
		}x;
		my $all_barriers = qr{
			(?:$barriers)|
			smp_(?:$barrier_stems)|
			virt_(?:$barrier_stems)
		}x;

		if ($line =~ /\b(?:$all_barriers)\s*\(/) {
			if (!ctx_has_comment($first_line, $linenr)) {
				WARN("MEMORY_BARRIER",
				     "memory barrier without comment\n" . $herecurr);
			}
		}

		my $underscore_smp_barriers = qr{__smp_(?:$barrier_stems)}x;

		if ($realfile !~ m@^include/asm-generic/@ &&
		    $realfile !~ m@/barrier\.h$@ &&
		    $line =~ m/\b(?:$underscore_smp_barriers)\s*\(/ &&
		    $line !~ m/^.\s*\#\s*define\s+(?:$underscore_smp_barriers)\s*\(/) {
			WARN("MEMORY_BARRIER",
			     "__smp memory barriers shouldn't be used outside barrier.h and asm-generic\n" . $herecurr);
		}

# check for waitqueue_active without a comment.
		if ($line =~ /\bwaitqueue_active\s*\(/) {
			if (!ctx_has_comment($first_line, $linenr)) {
				WARN("WAITQUEUE_ACTIVE",
				     "waitqueue_active without comment\n" . $herecurr);
			}
		}

# check of hardware specific defines
		if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
			CHK("ARCH_DEFINES",
			    "architecture specific defines should be avoided\n" .  $herecurr);
		}

# check that the storage class is not after a type
		if ($line =~ /\b($Type)\s+($Storage)\b/) {
			WARN("STORAGE_CLASS",
			     "storage class '$2' should be located before type '$1'\n" . $herecurr);
		}
# Check that the storage class is at the beginning of a declaration
		if ($line =~ /\b$Storage\b/ &&
		    $line !~ /^.\s*$Storage/ &&
		    $line =~ /^.\s*(.+?)\$Storage\s/ &&
		    $1 !~ /[\,\)]\s*$/) {
			WARN("STORAGE_CLASS",
			     "storage class should be at the beginning of the declaration\n" . $herecurr);
		}

# check the location of the inline attribute, that it is between
# storage class and type.
		if ($line =~ /\b$Type\s+$Inline\b/ ||
		    $line =~ /\b$Inline\s+$Storage\b/) {
			ERROR("INLINE_LOCATION",
			      "inline keyword should sit between storage class and type\n" . $herecurr);
		}

# Check for __inline__ and __inline, prefer inline
		if ($realfile !~ m@\binclude/uapi/@ &&
		    $line =~ /\b(__inline__|__inline)\b/) {
			if (WARN("INLINE",
				 "plain inline is preferred over $1\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/\b(__inline__|__inline)\b/inline/;

			}
		}

#
# Kernel macros unnused for FRR
#
# Check for __attribute__ packed, prefer __packed
#		if ($realfile !~ m@\binclude/uapi/@ &&
#		    $line =~ /\b__attribute__\s*\(\s*\(.*\bpacked\b/) {
#			WARN("PREFER_PACKED",
#			     "__packed is preferred over __attribute__((packed))\n" . $herecurr);
#		}

# Check for __attribute__ aligned, prefer __aligned
#		if ($realfile !~ m@\binclude/uapi/@ &&
#		    $line =~ /\b__attribute__\s*\(\s*\(.*aligned/) {
#			WARN("PREFER_ALIGNED",
#			     "__aligned(size) is preferred over __attribute__((aligned(size)))\n" . $herecurr);
#		}

# Check for __attribute__ format(printf, prefer __printf
#		if ($realfile !~ m@\binclude/uapi/@ &&
#		    $line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf/) {
#			if (WARN("PREFER_PRINTF",
#				 "__printf(string-index, first-to-check) is preferred over __attribute__((format(printf, string-index, first-to-check)))\n" . $herecurr) &&
#			    $fix) {
#				$fixed[$fixlinenr] =~ s/\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf\s*,\s*(.*)\)\s*\)\s*\)/"__printf(" . trim($1) . ")"/ex;

#			}
#		}

# Check for __attribute__ format(scanf, prefer __scanf
#		if ($realfile !~ m@\binclude/uapi/@ &&
#		    $line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\b/) {
#			if (WARN("PREFER_SCANF",
#				 "__scanf(string-index, first-to-check) is preferred over __attribute__((format(scanf, string-index, first-to-check)))\n" . $herecurr) &&
#			    $fix) {
#				$fixed[$fixlinenr] =~ s/\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\s*,\s*(.*)\)\s*\)\s*\)/"__scanf(" . trim($1) . ")"/ex;
#			}
#		}

# Check for __attribute__ weak, or __weak declarations (may have link issues)
#		if ($^V && $^V ge 5.10.0 &&
#		    $line =~ /(?:$Declare|$DeclareMisordered)\s*$Ident\s*$balanced_parens\s*(?:$Attribute)?\s*;/ &&
#		    ($line =~ /\b__attribute__\s*\(\s*\(.*\bweak\b/ ||
#		     $line =~ /\b__weak\b/)) {
#			ERROR("WEAK_DECLARATION",
#			      "Using weak declarations can have unintended link defects\n" . $herecurr);
#		}

# check for c99 types like uint8_t used outside of uapi/ and tools/
		if ($realfile !~ m@\binclude/uapi/@ &&
		    $realfile !~ m@\btools/@ &&
		    $line =~ /\b($Declare)\s*$Ident\s*[=;,\[]/) {
			my $type = $1;
			if ($type =~ /\b($typeC99Typedefs)\b/) {
				$type = $1;
				my $kernel_type = 'u';
				$kernel_type = 's' if ($type =~ /^_*[si]/);
				$type =~ /(\d+)/;
				$kernel_type .= $1;
				if (CHK("PREFER_KERNEL_TYPES",
					"Prefer kernel type '$kernel_type' over '$type'\n" . $herecurr) &&
				    $fix) {
					$fixed[$fixlinenr] =~ s/\b$type\b/$kernel_type/;
				}
			}
		}

# check for cast of C90 native int or longer types constants
		if ($line =~ /(\(\s*$C90_int_types\s*\)\s*)($Constant)\b/) {
			my $cast = $1;
			my $const = $2;
			if (WARN("TYPECAST_INT_CONSTANT",
				 "Unnecessary typecast of c90 int constant\n" . $herecurr) &&
			    $fix) {
				my $suffix = "";
				my $newconst = $const;
				$newconst =~ s/${Int_type}$//;
				$suffix .= 'U' if ($cast =~ /\bunsigned\b/);
				if ($cast =~ /\blong\s+long\b/) {
					$suffix .= 'LL';
				} elsif ($cast =~ /\blong\b/) {
					$suffix .= 'L';
				}
				$fixed[$fixlinenr] =~ s/\Q$cast\E$const\b/$newconst$suffix/;
			}
		}

# check for sizeof(&)
		if ($line =~ /\bsizeof\s*\(\s*\&/) {
			WARN("SIZEOF_ADDRESS",
			     "sizeof(& should be avoided\n" . $herecurr);
		}

# check for sizeof without parenthesis
		if ($line =~ /\bsizeof\s+((?:\*\s*|)$Lval|$Type(?:\s+$Lval|))/) {
			if (WARN("SIZEOF_PARENTHESIS",
				 "sizeof $1 should be sizeof($1)\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/\bsizeof\s+((?:\*\s*|)$Lval|$Type(?:\s+$Lval|))/"sizeof(" . trim($1) . ")"/ex;
			}
		}

# check for struct spinlock declarations
		if ($line =~ /^.\s*\bstruct\s+spinlock\s+\w+\s*;/) {
			WARN("USE_SPINLOCK_T",
			     "struct spinlock should be spinlock_t\n" . $herecurr);
		}

# check for seq_printf uses that could be seq_puts
		if ($sline =~ /\bseq_printf\s*\(.*"\s*\)\s*;\s*$/) {
			my $fmt = get_quoted_string($line, $rawline);
			$fmt =~ s/%%//g;
			if ($fmt !~ /%/) {
				if (WARN("PREFER_SEQ_PUTS",
					 "Prefer seq_puts to seq_printf\n" . $herecurr) &&
				    $fix) {
					$fixed[$fixlinenr] =~ s/\bseq_printf\b/seq_puts/;
				}
			}
		}

		# check for vsprintf extension %p<foo> misuses
		if (0 && $^V && $^V ge 5.10.0 &&
		    defined $stat &&
		    $stat =~ /^\+(?![^\{]*\{\s*).*\b(\w+)\s*\(.*$String\s*,/s &&
		    $1 !~ /^_*volatile_*$/) {
			my $bad_extension = "";
			my $lc = $stat =~ tr@\n@@;
			$lc = $lc + $linenr;
		        for (my $count = $linenr; $count <= $lc; $count++) {
				my $fmt = get_quoted_string($lines[$count - 1], raw_line($count, 0));
				$fmt =~ s/%%//g;
				if ($fmt =~ /(\%[\*\d\.]*p(?![\WFfSsBKRraEhMmIiUDdgVCbGNOx]).)/) {
					$bad_extension = $1;
					last;
				}
			}
			if ($bad_extension ne "") {
				my $stat_real = raw_line($linenr, 0);
				for (my $count = $linenr + 1; $count <= $lc; $count++) {
					$stat_real = $stat_real . "\n" . raw_line($count, 0);
				}
				WARN("VSPRINTF_POINTER_EXTENSION",
				     "Invalid vsprintf pointer extension '$bad_extension'\n" . "$here\n$stat_real\n");
			}
		}

# Check for misused memsets
		if ($^V && $^V ge 5.10.0 &&
		    defined $stat &&
		    $stat =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*$FuncArg\s*\)/) {

			my $ms_addr = $2;
			my $ms_val = $7;
			my $ms_size = $12;

			if ($ms_size =~ /^(0x|)0$/i) {
				ERROR("MEMSET",
				      "memset to 0's uses 0 as the 2nd argument, not the 3rd\n" . "$here\n$stat\n");
			} elsif ($ms_size =~ /^(0x|)1$/i) {
				WARN("MEMSET",
				     "single byte memset is suspicious. Swapped 2nd/3rd argument?\n" . "$here\n$stat\n");
			}
		}

# Check for memcpy(foo, bar, ETH_ALEN) that could be ether_addr_copy(foo, bar)
#		if ($^V && $^V ge 5.10.0 &&
#		    defined $stat &&
#		    $stat =~ /^\+(?:.*?)\bmemcpy\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/) {
#			if (WARN("PREFER_ETHER_ADDR_COPY",
#				 "Prefer ether_addr_copy() over memcpy() if the Ethernet addresses are __aligned(2)\n" . "$here\n$stat\n") &&
#			    $fix) {
#				$fixed[$fixlinenr] =~ s/\bmemcpy\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/ether_addr_copy($2, $7)/;
#			}
#		}

# Check for memcmp(foo, bar, ETH_ALEN) that could be ether_addr_equal*(foo, bar)
#		if ($^V && $^V ge 5.10.0 &&
#		    defined $stat &&
#		    $stat =~ /^\+(?:.*?)\bmemcmp\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/) {
#			WARN("PREFER_ETHER_ADDR_EQUAL",
#			     "Prefer ether_addr_equal() or ether_addr_equal_unaligned() over memcmp()\n" . "$here\n$stat\n")
#		}

# check for memset(foo, 0x0, ETH_ALEN) that could be eth_zero_addr
# check for memset(foo, 0xFF, ETH_ALEN) that could be eth_broadcast_addr
#		if ($^V && $^V ge 5.10.0 &&
#		    defined $stat &&
#		    $stat =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/) {
#
#			my $ms_val = $7;
#
#			if ($ms_val =~ /^(?:0x|)0+$/i) {
#				if (WARN("PREFER_ETH_ZERO_ADDR",
#					 "Prefer eth_zero_addr over memset()\n" . "$here\n$stat\n") &&
#				    $fix) {
#					$fixed[$fixlinenr] =~ s/\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*,\s*ETH_ALEN\s*\)/eth_zero_addr($2)/;
#				}
#			} elsif ($ms_val =~ /^(?:0xff|255)$/i) {
#				if (WARN("PREFER_ETH_BROADCAST_ADDR",
#					 "Prefer eth_broadcast_addr() over memset()\n" . "$here\n$stat\n") &&
#				    $fix) {
#					$fixed[$fixlinenr] =~ s/\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*,\s*ETH_ALEN\s*\)/eth_broadcast_addr($2)/;
#				}
#			}
#		}

# typecasts on min/max could be min_t/max_t
		if ($^V && $^V ge 5.10.0 &&
		    defined $stat &&
		    $stat =~ /^\+(?:.*?)\b(min|max)\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\)/) {
			if (defined $2 || defined $7) {
				my $call = $1;
				my $cast1 = deparenthesize($2);
				my $arg1 = $3;
				my $cast2 = deparenthesize($7);
				my $arg2 = $8;
				my $cast;

				if ($cast1 ne "" && $cast2 ne "" && $cast1 ne $cast2) {
					$cast = "$cast1 or $cast2";
				} elsif ($cast1 ne "") {
					$cast = $cast1;
				} else {
					$cast = $cast2;
				}
				WARN("MINMAX",
				     "$call() should probably be ${call}_t($cast, $arg1, $arg2)\n" . "$here\n$stat\n");
			}
		}

# check usleep_range arguments
		if ($^V && $^V ge 5.10.0 &&
		    defined $stat &&
		    $stat =~ /^\+(?:.*?)\busleep_range\s*\(\s*($FuncArg)\s*,\s*($FuncArg)\s*\)/) {
			my $min = $1;
			my $max = $7;
			if ($min eq $max) {
				WARN("USLEEP_RANGE",
				     "usleep_range should not use min == max args; see Documentation/timers/timers-howto.txt\n" . "$here\n$stat\n");
			} elsif ($min =~ /^\d+$/ && $max =~ /^\d+$/ &&
				 $min > $max) {
				WARN("USLEEP_RANGE",
				     "usleep_range args reversed, use min then max; see Documentation/timers/timers-howto.txt\n" . "$here\n$stat\n");
			}
		}

# check for naked sscanf
		if ($^V && $^V ge 5.10.0 &&
		    defined $stat &&
		    $line =~ /\bsscanf\b/ &&
		    ($stat !~ /$Ident\s*=\s*sscanf\s*$balanced_parens/ &&
		     $stat !~ /\bsscanf\s*$balanced_parens\s*(?:$Compare)/ &&
		     $stat !~ /(?:$Compare)\s*\bsscanf\s*$balanced_parens/)) {
			my $lc = $stat =~ tr@\n@@;
			$lc = $lc + $linenr;
			my $stat_real = raw_line($linenr, 0);
		        for (my $count = $linenr + 1; $count <= $lc; $count++) {
				$stat_real = $stat_real . "\n" . raw_line($count, 0);
			}
			WARN("NAKED_SSCANF",
			     "unchecked sscanf return value\n" . "$here\n$stat_real\n");
		}

# check for new externs in .h files.
		if ($realfile =~ /\.h$/ &&
		    $line =~ /^\+\s*(extern\s+)$Type\s*$Ident\s*\(/s) {
			if (CHK("AVOID_EXTERNS",
				"extern prototypes should be avoided in .h files\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/(.*)\bextern\b\s*(.*)/$1$2/;
			}
		}

# check for new externs in .c files.
		if ($realfile =~ /\.c$/ && defined $stat &&
		    $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
		{
			my $function_name = $1;
			my $paren_space = $2;

			my $s = $stat;
			if (defined $cond) {
				substr($s, 0, length($cond), '');
			}
			if ($s =~ /^\s*;/ &&
			    $function_name ne 'uninitialized_var')
			{
				WARN("AVOID_EXTERNS",
				     "externs should be avoided in .c files\n" .  $herecurr);
			}

			if ($paren_space =~ /\n/) {
				WARN("FUNCTION_ARGUMENTS",
				     "arguments for function declarations should follow identifier\n" . $herecurr);
			}

		} elsif ($realfile =~ /\.c$/ && defined $stat &&
		    $stat =~ /^.\s*extern\s+/)
		{
			WARN("AVOID_EXTERNS",
			     "externs should be avoided in .c files\n" .  $herecurr);
		}

# check for function declarations that have arguments without identifier names
		if (defined $stat &&
		    $stat =~ /^.\s*(?:extern\s+)?$Type\s*(?:$Ident|\(\s*\*\s*$Ident\s*\))\s*\(\s*([^{]+)\s*\)\s*;/s &&
		    $1 ne "void") {
			my $args = trim($1);
			while ($args =~ m/\s*($Type\s*(?:$Ident|\(\s*\*\s*$Ident?\s*\)\s*$balanced_parens)?)/g) {
				my $arg = trim($1);
				if ($arg =~ /^$Type$/ && $arg !~ /enum\s+$Ident$/) {
					WARN("FUNCTION_ARGUMENTS",
					     "function definition argument '$arg' should also have an identifier name\n" . $herecurr);
				}
			}
		}

# check for function definitions
		if ($^V && $^V ge 5.10.0 &&
		    defined $stat &&
		    $stat =~ /^.\s*(?:$Storage\s+)?$Type\s*($Ident)\s*$balanced_parens\s*{/s) {
			$context_function = $1;

# check for multiline function definition with misplaced open brace
			my $ok = 0;
			my $cnt = statement_rawlines($stat);
			my $herectx = $here . "\n";
			for (my $n = 0; $n < $cnt; $n++) {
				my $rl = raw_line($linenr, $n);
				$herectx .=  $rl . "\n";
				$ok = 1 if ($rl =~ /^[ \+]\{/);
				$ok = 1 if ($rl =~ /\{/ && $n == 0);
				last if $rl =~ /^[ \+].*\{/;
			}
			if (!$ok) {
				ERROR("OPEN_BRACE",
				      "open brace '{' following function definitions go on the next line\n" . $herectx);
			}
		}

# checks for new __setup's
		if ($rawline =~ /\b__setup\("([^"]*)"/) {
			my $name = $1;

			if (!grep(/$name/, @setup_docs)) {
				CHK("UNDOCUMENTED_SETUP",
				    "__setup appears un-documented -- check Documentation/admin-guide/kernel-parameters.rst\n" . $herecurr);
			}
		}

# check for pointless casting of kmalloc return
		if ($line =~ /\*\s*\)\s*[kv][czm]alloc(_node){0,1}\b/) {
			WARN("UNNECESSARY_CASTS",
			     "unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
		}

# alloc style
# p = alloc(sizeof(struct foo), ...) should be p = alloc(sizeof(*p), ...)
		if ($^V && $^V ge 5.10.0 &&
		    $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*([kv][mz]alloc(?:_node)?)\s*\(\s*(sizeof\s*\(\s*struct\s+$Lval\s*\))/) {
			CHK("ALLOC_SIZEOF_STRUCT",
			    "Prefer $3(sizeof(*$1)...) over $3($4...)\n" . $herecurr);
		}

# check for k[mz]alloc with multiplies that could be kmalloc_array/kcalloc
		if ($^V && $^V ge 5.10.0 &&
		    defined $stat &&
		    $stat =~ /^\+\s*($Lval)\s*\=\s*(?:$balanced_parens)?\s*(k[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)\s*,/) {
			my $oldfunc = $3;
			my $a1 = $4;
			my $a2 = $10;
			my $newfunc = "kmalloc_array";
			$newfunc = "kcalloc" if ($oldfunc eq "kzalloc");
			my $r1 = $a1;
			my $r2 = $a2;
			if ($a1 =~ /^sizeof\s*\S/) {
				$r1 = $a2;
				$r2 = $a1;
			}
			if ($r1 !~ /^sizeof\b/ && $r2 =~ /^sizeof\s*\S/ &&
			    !($r1 =~ /^$Constant$/ || $r1 =~ /^[A-Z_][A-Z0-9_]*$/)) {
				my $ctx = '';
				my $herectx = $here . "\n";
				my $cnt = statement_rawlines($stat);
				for (my $n = 0; $n < $cnt; $n++) {
					$herectx .= raw_line($linenr, $n) . "\n";
				}
				if (WARN("ALLOC_WITH_MULTIPLY",
					 "Prefer $newfunc over $oldfunc with multiply\n" . $herectx) &&
				    $cnt == 1 &&
				    $fix) {
					$fixed[$fixlinenr] =~ s/\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*(k[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)/$1 . ' = ' . "$newfunc(" . trim($r1) . ', ' . trim($r2)/e;
				}
			}
		}

# check for krealloc arg reuse
		if ($^V && $^V ge 5.10.0 &&
		    $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*krealloc\s*\(\s*\1\s*,/) {
			WARN("KREALLOC_ARG_REUSE",
			     "Reusing the krealloc arg is almost always a bug\n" . $herecurr);
		}

# check for alloc argument mismatch
		if ($line =~ /\b(kcalloc|kmalloc_array)\s*\(\s*sizeof\b/) {
			WARN("ALLOC_ARRAY_ARGS",
			     "$1 uses number as first arg, sizeof is generally wrong\n" . $herecurr);
		}

# check for multiple semicolons
		if ($line =~ /;\s*;\s*$/) {
			if (WARN("ONE_SEMICOLON",
				 "Statements terminations use 1 semicolon\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/(\s*;\s*){2,}$/;/g;
			}
		}

# check for #defines like: 1 << <digit> that could be BIT(digit), it is not exported to uapi
		if ($realfile !~ m@^include/uapi/@ &&
		    $line =~ /#\s*define\s+\w+\s+\(?\s*1\s*([ulUL]*)\s*\<\<\s*(?:\d+|$Ident)\s*\)?/) {
			my $ull = "";
			$ull = "_ULL" if (defined($1) && $1 =~ /ll/i);
			if (CHK("BIT_MACRO",
				"Prefer using the BIT$ull macro\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/\(?\s*1\s*[ulUL]*\s*<<\s*(\d+|$Ident)\s*\)?/BIT${ull}($1)/;
			}
		}

# check for #if defined CONFIG_<FOO> || defined CONFIG_<FOO>_MODULE
		if ($line =~ /^\+\s*#\s*if\s+defined(?:\s*\(?\s*|\s+)(CONFIG_[A-Z_]+)\s*\)?\s*\|\|\s*defined(?:\s*\(?\s*|\s+)\1_MODULE\s*\)?\s*$/) {
			my $config = $1;
			if (WARN("PREFER_IS_ENABLED",
				 "Prefer IS_ENABLED(<FOO>) to CONFIG_<FOO> || CONFIG_<FOO>_MODULE\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] = "\+#if IS_ENABLED($config)";
			}
		}

# check for case / default statements not preceded by break/fallthrough/switch
		if ($line =~ /^.\s*(?:case\s+(?:$Ident|$Constant)\s*|default):/) {
			my $has_break = 0;
			my $has_statement = 0;
			my $count = 0;
			my $prevline = $linenr;
			while ($prevline > 1 && ($file || $count < 3) && !$has_break) {
				$prevline--;
				my $rline = $rawlines[$prevline - 1];
				my $fline = $lines[$prevline - 1];
				last if ($fline =~ /^\@\@/);
				next if ($fline =~ /^\-/);
				next if ($fline =~ /^.(?:\s*(?:case\s+(?:$Ident|$Constant)[\s$;]*|default):[\s$;]*)*$/);
				$has_break = 1 if ($rline =~ /fall[\s_-]*(through|thru)/i);
				next if ($fline =~ /^.[\s$;]*$/);
				$has_statement = 1;
				$count++;
				$has_break = 1 if ($fline =~ /\bswitch\b|\b(?:break\s*;[\s$;]*$|exit\s*\(\b|return\b|goto\b|continue\b)/);
			}
			if (!$has_break && $has_statement) {
				WARN("MISSING_BREAK",
				     "Possible switch case/default not preceded by break or fallthrough comment\n" . $herecurr);
			}
		}

# check for switch/default statements without a break;
		if ($^V && $^V ge 5.10.0 &&
		    defined $stat &&
		    $stat =~ /^\+[$;\s]*(?:case[$;\s]+\w+[$;\s]*:[$;\s]*|)*[$;\s]*\bdefault[$;\s]*:[$;\s]*;/g) {
			my $ctx = '';
			my $herectx = $here . "\n";
			my $cnt = statement_rawlines($stat);
			for (my $n = 0; $n < $cnt; $n++) {
				$herectx .= raw_line($linenr, $n) . "\n";
			}
			WARN("DEFAULT_NO_BREAK",
			     "switch default: should use break\n" . $herectx);
		}

# check for gcc specific __FUNCTION__
		if ($line =~ /\b__FUNCTION__\b/) {
			if (WARN("USE_FUNC",
				 "__func__ should be used instead of gcc specific __FUNCTION__\n"  . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/\b__FUNCTION__\b/__func__/g;
			}
		}

# check for uses of __DATE__, __TIME__, __TIMESTAMP__
		while ($line =~ /\b(__(?:DATE|TIME|TIMESTAMP)__)\b/g) {
			ERROR("DATE_TIME",
			      "Use of the '$1' macro makes the build non-deterministic\n" . $herecurr);
		}

# check for use of yield()
		if ($line =~ /\byield\s*\(\s*\)/) {
			WARN("YIELD",
			     "Using yield() is generally wrong. See yield() kernel-doc (sched/core.c)\n"  . $herecurr);
		}

# check for comparisons against true and false
		if ($line =~ /\+\s*(.*?)\b(true|false|$Lval)\s*(==|\!=)\s*(true|false|$Lval)\b(.*)$/i) {
			my $lead = $1;
			my $arg = $2;
			my $test = $3;
			my $otype = $4;
			my $trail = $5;
			my $op = "!";

			($arg, $otype) = ($otype, $arg) if ($arg =~ /^(?:true|false)$/i);

			my $type = lc($otype);
			if ($type =~ /^(?:true|false)$/) {
				if (("$test" eq "==" && "$type" eq "true") ||
				    ("$test" eq "!=" && "$type" eq "false")) {
					$op = "";
				}

				CHK("BOOL_COMPARISON",
				    "Using comparison to $otype is error prone\n" . $herecurr);

## maybe suggesting a correct construct would better
##				    "Using comparison to $otype is error prone.  Perhaps use '${lead}${op}${arg}${trail}'\n" . $herecurr);

			}
		}

# check for semaphores initialized locked
		if ($line =~ /^.\s*sema_init.+,\W?0\W?\)/) {
			WARN("CONSIDER_COMPLETION",
			     "consider using a completion\n" . $herecurr);
		}

# check for __initcall(), use device_initcall() explicitly or more appropriate function please
		if ($line =~ /^.\s*__initcall\s*\(/) {
			WARN("USE_DEVICE_INITCALL",
			     "please use device_initcall() or more appropriate function instead of __initcall() (see include/linux/init.h)\n" . $herecurr);
		}

# use of NR_CPUS is usually wrong
# ignore definitions of NR_CPUS and usage to define arrays as likely right
		if ($line =~ /\bNR_CPUS\b/ &&
		    $line !~ /^.\s*\s*#\s*if\b.*\bNR_CPUS\b/ &&
		    $line !~ /^.\s*\s*#\s*define\b.*\bNR_CPUS\b/ &&
		    $line !~ /^.\s*$Declare\s.*\[[^\]]*NR_CPUS[^\]]*\]/ &&
		    $line !~ /\[[^\]]*\.\.\.[^\]]*NR_CPUS[^\]]*\]/ &&
		    $line !~ /\[[^\]]*NR_CPUS[^\]]*\.\.\.[^\]]*\]/)
		{
			WARN("NR_CPUS",
			     "usage of NR_CPUS is often wrong - consider using cpu_possible(), num_possible_cpus(), for_each_possible_cpu(), etc\n" . $herecurr);
		}

# Use of __ARCH_HAS_<FOO> or ARCH_HAVE_<BAR> is wrong.
		if ($line =~ /\+\s*#\s*define\s+((?:__)?ARCH_(?:HAS|HAVE)\w*)\b/) {
			ERROR("DEFINE_ARCH_HAS",
			      "#define of '$1' is wrong - use Kconfig variables or standard guards instead\n" . $herecurr);
		}

# likely/unlikely comparisons similar to "(likely(foo) > 0)"
		if ($^V && $^V ge 5.10.0 &&
		    $line =~ /\b((?:un)?likely)\s*\(\s*$FuncArg\s*\)\s*$Compare/) {
			WARN("LIKELY_MISUSE",
			     "Using $1 should generally have parentheses around the comparison\n" . $herecurr);
		}

# whine mightly about in_atomic
		if ($line =~ /\bin_atomic\s*\(/) {
			if ($realfile =~ m@^drivers/@) {
				ERROR("IN_ATOMIC",
				      "do not use in_atomic in drivers\n" . $herecurr);
			} elsif ($realfile !~ m@^kernel/@) {
				WARN("IN_ATOMIC",
				     "use of in_atomic() is incorrect outside core kernel code\n" . $herecurr);
			}
		}

# whine about ACCESS_ONCE
		if ($^V && $^V ge 5.10.0 &&
		    $line =~ /\bACCESS_ONCE\s*$balanced_parens\s*(=(?!=))?\s*($FuncArg)?/) {
			my $par = $1;
			my $eq = $2;
			my $fun = $3;
			$par =~ s/^\(\s*(.*)\s*\)$/$1/;
			if (defined($eq)) {
				if (WARN("PREFER_WRITE_ONCE",
					 "Prefer WRITE_ONCE(<FOO>, <BAR>) over ACCESS_ONCE(<FOO>) = <BAR>\n" . $herecurr) &&
				    $fix) {
					$fixed[$fixlinenr] =~ s/\bACCESS_ONCE\s*\(\s*\Q$par\E\s*\)\s*$eq\s*\Q$fun\E/WRITE_ONCE($par, $fun)/;
				}
			} else {
				if (WARN("PREFER_READ_ONCE",
					 "Prefer READ_ONCE(<FOO>) over ACCESS_ONCE(<FOO>)\n" . $herecurr) &&
				    $fix) {
					$fixed[$fixlinenr] =~ s/\bACCESS_ONCE\s*\(\s*\Q$par\E\s*\)/READ_ONCE($par)/;
				}
			}
		}

# check for mutex_trylock_recursive usage
		if ($line =~ /mutex_trylock_recursive/) {
			ERROR("LOCKING",
			      "recursive locking is bad, do not use this ever.\n" . $herecurr);
		}

# check for lockdep_set_novalidate_class
		if ($line =~ /^.\s*lockdep_set_novalidate_class\s*\(/ ||
		    $line =~ /__lockdep_no_validate__\s*\)/ ) {
			if ($realfile !~ m@^kernel/lockdep@ &&
			    $realfile !~ m@^include/linux/lockdep@ &&
			    $realfile !~ m@^drivers/base/core@) {
				ERROR("LOCKDEP",
				      "lockdep_no_validate class is reserved for device->mutex.\n" . $herecurr);
			}
		}

		if ($line =~ /debugfs_create_\w+.*\b$mode_perms_world_writable\b/ ||
		    $line =~ /DEVICE_ATTR.*\b$mode_perms_world_writable\b/) {
			WARN("EXPORTED_WORLD_WRITABLE",
			     "Exporting world writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
		}

# Mode permission misuses where it seems decimal should be octal
# This uses a shortcut match to avoid unnecessary uses of a slow foreach loop
		if ($^V && $^V ge 5.10.0 &&
		    defined $stat &&
		    $line =~ /$mode_perms_search/) {
			foreach my $entry (@mode_permission_funcs) {
				my $func = $entry->[0];
				my $arg_pos = $entry->[1];

				my $lc = $stat =~ tr@\n@@;
				$lc = $lc + $linenr;
				my $stat_real = raw_line($linenr, 0);
				for (my $count = $linenr + 1; $count <= $lc; $count++) {
					$stat_real = $stat_real . "\n" . raw_line($count, 0);
				}

				my $skip_args = "";
				if ($arg_pos > 1) {
					$arg_pos--;
					$skip_args = "(?:\\s*$FuncArg\\s*,\\s*){$arg_pos,$arg_pos}";
				}
				my $test = "\\b$func\\s*\\(${skip_args}($FuncArg(?:\\|\\s*$FuncArg)*)\\s*[,\\)]";
				if ($stat =~ /$test/) {
					my $val = $1;
					$val = $6 if ($skip_args ne "");
					if (($val =~ /^$Int$/ && $val !~ /^$Octal$/) ||
					    ($val =~ /^$Octal$/ && length($val) ne 4)) {
						ERROR("NON_OCTAL_PERMISSIONS",
						      "Use 4 digit octal (0777) not decimal permissions\n" . "$here\n" . $stat_real);
					}
					if ($val =~ /^$Octal$/ && (oct($val) & 02)) {
						ERROR("EXPORTED_WORLD_WRITABLE",
						      "Exporting writable files is usually an error. Consider more restrictive permissions.\n" . "$here\n" . $stat_real);
					}
				}
			}
		}

# check for uses of S_<PERMS> that could be octal for readability
		if ($line =~ /\b$mode_perms_string_search\b/) {
			my $val = "";
			my $oval = "";
			my $to = 0;
			my $curpos = 0;
			my $lastpos = 0;
			while ($line =~ /\b(($mode_perms_string_search)\b(?:\s*\|\s*)?\s*)/g) {
				$curpos = pos($line);
				my $match = $2;
				my $omatch = $1;
				last if ($lastpos > 0 && ($curpos - length($omatch) != $lastpos));
				$lastpos = $curpos;
				$to |= $mode_permission_string_types{$match};
				$val .= '\s*\|\s*' if ($val ne "");
				$val .= $match;
				$oval .= $omatch;
			}
			$oval =~ s/^\s*\|\s*//;
			$oval =~ s/\s*\|\s*$//;
			my $octal = sprintf("%04o", $to);
			if (WARN("SYMBOLIC_PERMS",
				 "Symbolic permissions '$oval' are not preferred. Consider using octal permissions '$octal'.\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/$val/$octal/;
			}
		}

# validate content of MODULE_LICENSE against list from include/linux/module.h
		if ($line =~ /\bMODULE_LICENSE\s*\(\s*($String)\s*\)/) {
			my $extracted_string = get_quoted_string($line, $rawline);
			my $valid_licenses = qr{
						GPL|
						GPL\ v2|
						GPL\ and\ additional\ rights|
						Dual\ BSD/GPL|
						Dual\ MIT/GPL|
						Dual\ MPL/GPL|
						Proprietary
					}x;
			if ($extracted_string !~ /^"(?:$valid_licenses)"$/x) {
				WARN("MODULE_LICENSE",
				     "unknown module license " . $extracted_string . "\n" . $herecurr);
			}
		}

# check for usage of nonstandard fixed-width integral types
		if ($line =~ /u_int8_t/ ||
		    $line =~ /u_int32_t/ ||
		    $line =~ /u_int16_t/ ||
		    $line =~ /u_int64_t/ ||
		    $line =~ /[^a-z_]u_char[^a-z_]/ ||
		    $line =~ /[^a-z_]u_short[^a-z_]/ ||
		    $line =~ /[^a-z_]u_int[^a-z_]/ ||
		    $line =~ /[^a-z_]u_long[^a-z_]/) {
			ERROR("NONSTANDARD_INTEGRAL_TYPES",
			      "Please, no nonstandard integer types in new code.\n" . $herecurr)
		}

# check for usage of non-32 bit atomics
		if ($line =~ /_Atomic [u]?int(?!32)[0-9]+_t/) {
			WARN("NON_32BIT_ATOMIC",
			     "Please, only use 32 bit atomics.\n" . $herecurr);
		}

# check for use of strcpy()
		if ($line =~ /\bstrcpy\s*\(.*\)/) {
			ERROR("STRCPY",
			      "strcpy() is error-prone; please use strlcpy()"  . $herecurr);
		}

# check for use of strncpy()
		if ($line =~ /\bstrncpy\s*\(.*\)/) {
			WARN("STRNCPY",
			     "strncpy() is error-prone; please use strlcpy() if possible, or memcpy()"  . $herecurr);
		}

# check for use of strcat()
		if ($line =~ /\bstrcat\s*\(.*\)/) {
			ERROR("STRCAT",
			      "strcat() is error-prone; please use strlcat() if possible"  . $herecurr);
		}

# check for use of strncat()
		if ($line =~ /\bstrncat\s*\(.*\)/) {
			WARN("STRNCAT",
			     "strncat() is error-prone; please use strlcat() if possible"  . $herecurr);
		}

# check for use of bzero()
		if ($line =~ /\bbzero\s*\(.*\)/) {
			ERROR("BZERO",
			      "bzero() is deprecated; use memset()"  . $herecurr);
		}
	}

	# If we have no input at all, then there is nothing to report on
	# so just keep quiet.
	if ($#rawlines == -1) {
		exit(0);
	}

	# In mailback mode only produce a report in the negative, for
	# things that appear to be patches.
	if ($mailback && ($clean == 1 || !$is_patch)) {
		exit(0);
	}

	# This is not a patch, and we are are in 'no-patch' mode so
	# just keep quiet.
	if (!$chk_patch && !$is_patch) {
		exit(0);
	}

	if (!$is_patch && $filename !~ /cover-letter\.patch$/) {
		ERROR("NOT_UNIFIED_DIFF",
		      "Does not appear to be a unified-diff format patch\n");
	}
	if ($is_patch && $has_commit_log && $chk_signoff && $signoff == 0) {
		ERROR("MISSING_SIGN_OFF",
		      "Missing Signed-off-by: line(s)\n");
	}

	print report_dump();
	if ($summary && !($clean == 1 && $quiet == 1)) {
		print "$filename " if ($summary_file);
		print "total: $cnt_error errors, $cnt_warn warnings, " .
			(($check)? "$cnt_chk checks, " : "") .
			"$cnt_lines lines checked\n";
	}

	if ($quiet == 0) {
		# If there were any defects found and not already fixing them
		if (!$clean and !$fix) {
			print << "EOM"

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.
EOM
		}
		# If there were whitespace errors which cleanpatch can fix
		# then suggest that.
		if ($rpt_cleaners) {
			$rpt_cleaners = 0;
			print << "EOM"

NOTE: Whitespace errors detected.
      You may wish to use scripts/cleanpatch or scripts/cleanfile
EOM
		}
	}

	if ($clean == 0 && $fix &&
	    ("@rawlines" ne "@fixed" ||
	     $#fixed_inserted >= 0 || $#fixed_deleted >= 0)) {
		my $newfile = $filename;
		$newfile .= ".EXPERIMENTAL-checkpatch-fixes" if (!$fix_inplace);
		my $linecount = 0;
		my $f;

		@fixed = fix_inserted_deleted_lines(\@fixed, \@fixed_inserted, \@fixed_deleted);

		open($f, '>', $newfile)
		    or die "$P: Can't open $newfile for write\n";
		foreach my $fixed_line (@fixed) {
			$linecount++;
			if ($file) {
				if ($linecount > 3) {
					$fixed_line =~ s/^\+//;
					print $f $fixed_line . "\n";
				}
			} else {
				print $f $fixed_line . "\n";
			}
		}
		close($f);

		if (!$quiet) {
			print << "EOM";

Wrote EXPERIMENTAL --fix correction(s) to '$newfile'

Do _NOT_ trust the results written to this file.
Do _NOT_ submit these changes without inspecting them for correctness.

This EXPERIMENTAL file is simply a convenience to help rewrite patches.
No warranties, expressed or implied...
EOM
		}
	}

	if ($quiet == 0) {
		print "\n";
		if ($clean == 1) {
			print "$vname has no obvious style problems and is ready for submission.\n";
		} else {
			print "$vname has style problems, please review.\n";
		}
	}
	return $clean;
}