Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/scripts/coccinelle/misc/uninitialized_var.cocci b/scripts/coccinelle/misc/uninitialized_var.cocci
new file mode 100644
index 0000000000..69bbaae47e
--- /dev/null
+++ b/scripts/coccinelle/misc/uninitialized_var.cocci
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0-only
+///
+/// Please, don't reintroduce uninitialized_var().
+///
+/// From Documentation/process/deprecated.rst,
+/// commit 4b19bec97c88 ("docs: deprecated.rst: Add uninitialized_var()"):
+///  For any compiler warnings about uninitialized variables, just add
+///  an initializer. Using warning-silencing tricks is dangerous as it
+///  papers over real bugs (or can in the future), and suppresses unrelated
+///  compiler warnings (e.g. "unused variable"). If the compiler thinks it
+///  is uninitialized, either simply initialize the variable or make compiler
+///  changes. Keep in mind that in most cases, if an initialization is
+///  obviously redundant, the compiler's dead-store elimination pass will make
+///  sure there are no needless variable writes.
+///
+/// Later, commit 3942ea7a10c9 ("deprecated.rst: Remove now removed
+/// uninitialized_var") removed this section because all initializations of
+/// this kind were cleaned-up from the kernel. This cocci rule checks that
+/// the macro is not explicitly or implicitly reintroduced.
+///
+// Confidence: High
+// Copyright: (C) 2020 Denis Efremov ISPRAS
+// Options: --no-includes --include-headers
+//
+
+virtual context
+virtual report
+virtual org
+
+@r@
+identifier var;
+type T;
+position p;
+@@
+
+(
+* T var =@p var;
+|
+* T var =@p *(&(var));
+|
+* var =@p var
+|
+* var =@p *(&(var))
+)
+
+@script:python depends on report@
+p << r.p;
+@@
+
+coccilib.report.print_report(p[0], "WARNING this kind of initialization is deprecated")
+
+@script:python depends on org@
+p << r.p;
+@@
+
+coccilib.org.print_todo(p[0], "WARNING this kind of initialization is deprecated")