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. Signed-off-by: Joe Perches <j...@perches.com> Suggested-by: Peter Zijlstra <pet...@infradead.org> --- scripts/checkpatch.pl | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index e16d6713f236..24618dffc5cb 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -6257,6 +6257,13 @@ sub process { "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" . $herecurr); + } + # check for semaphores initialized locked if ($line =~ /^.\s*sema_init.+,\W?0\W?\)/) { WARN("CONSIDER_COMPLETION", -- 2.15.0