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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /scripts/coccinelle/misc/cond_no_effect.cocci
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'scripts/coccinelle/misc/cond_no_effect.cocci')
-rw-r--r--scripts/coccinelle/misc/cond_no_effect.cocci65
1 files changed, 65 insertions, 0 deletions
diff --git a/scripts/coccinelle/misc/cond_no_effect.cocci b/scripts/coccinelle/misc/cond_no_effect.cocci
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+++ b/scripts/coccinelle/misc/cond_no_effect.cocci
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+// SPDX-License-Identifier: GPL-2.0-only
+///Find conditions where if and else branch are functionally
+// identical.
+//
+// There can be false positives in cases where the positional
+// information is used (as with lockdep) or where the identity
+// is a placeholder for not yet handled cases.
+// Unfortunately there also seems to be a tendency to use
+// the last if else/else as a "default behavior" - which some
+// might consider a legitimate coding pattern. From discussion
+// on kernelnewbies though it seems that this is not really an
+// accepted pattern and if at all it would need to be commented
+//
+// In the Linux kernel it does not seem to actually report
+// false positives except for those that were documented as
+// being intentional.
+// the two known cases are:
+// arch/sh/kernel/traps_64.c:read_opcode()
+// } else if ((pc & 1) == 0) {
+// /* SHcompact */
+// /* TODO : provide handling for this. We don't really support
+// user-mode SHcompact yet, and for a kernel fault, this would
+// have to come from a module built for SHcompact. */
+// return -EFAULT;
+// } else {
+// /* misaligned */
+// return -EFAULT;
+// }
+// fs/kernfs/file.c:kernfs_fop_open()
+// * Both paths of the branch look the same. They're supposed to
+// * look that way and give @of->mutex different static lockdep keys.
+// */
+// if (has_mmap)
+// mutex_init(&of->mutex);
+// else
+// mutex_init(&of->mutex);
+//
+// All other cases look like bugs or at least lack of documentation
+//
+// Confidence: Moderate
+// Copyright: (C) 2016 Nicholas Mc Guire, OSADL.
+// Comments:
+// Options: --no-includes --include-headers
+
+virtual org
+virtual report
+
+@cond@
+statement S1;
+position p;
+@@
+
+* if@p (...) S1 else S1
+
+@script:python depends on org@
+p << cond.p;
+@@
+
+cocci.print_main("WARNING: possible condition with no effect (if == else)",p)
+
+@script:python depends on report@
+p << cond.p;
+@@
+
+coccilib.report.print_report(p[0],"WARNING: possible condition with no effect (if == else)")