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checkpatch: add a --strict test for structs with bool member definitions 

A struct with a bool member can have different sizes on various
architectures because neither bool size nor alignment is standardized.

So emit a message on the use of bool in structs only in .h files and not
.c files.

There is the real possibility that this test could have a false positive
when a bool is declared as an automatic, so limit the test to .h files
where the only false positive is for declarations in static inline
functions.

Link: http://lkml.kernel.org/r/95477c93db187bab6da8a8ba7c57836868446179.camel@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joe Perches 2018-08-21 21:57:26 -07:00 committed by Linus Torvalds
parent de9df3993c
commit d729593e49
1 changed files with 7 additions and 0 deletions
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7
scripts/checkpatch.pl
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@ -6251,6 +6251,13 @@ sub process {
"Avoid using bool as bitfield. Prefer bool bitfields as unsigned int or u<8|16|32>\n" . $herecurr); "Avoid using bool as bitfield. Prefer bool bitfields as unsigned int or u<8|16|32>\n" . $herecurr);
} }
# check for bool use in .h files
if ($realfile =~ /\.h$/ &&
$sline =~ /^.\s+bool\s*$Ident\s*(?::\s*d+\s*)?;/) {
CHK("BOOL_MEMBER",
"Avoid using bool structure members because of possible alignment issues - see: https://lkml.org/lkml/2017/11/21/384\n" . $herecurr);
}
# check for semaphores initialized locked # check for semaphores initialized locked
if ($line =~ /^.\s*sema_init.+,\W?0\W?\)/) { if ($line =~ /^.\s*sema_init.+,\W?0\W?\)/) {
WARN("CONSIDER_COMPLETION", WARN("CONSIDER_COMPLETION",