Re: [PATCH v6 5/6] MCS Lock: Restructure the MCS lock defines andlocking code into its own file

[Joe Perches]

On Fri, 2013-09-27 at 13:23 +0200, Peter Zijlstra wrote:
> checkpatch.pl should really warn about that; and it appears there
> code in there for that; however:
> 
> # grep -C3 smp_mb scripts/checkpatch.pl 
[]
> # check for memory barriers without a comment.
>                 if ($line =~ /\b(mb|rmb|wmb|read_barrier_depends|smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
>                         if (!ctx_has_comment($first_line, $linenr)) {
>                                 CHK("MEMORY_BARRIER",
>                                     "memory barrier without comment\n" . $herecurr);
[]
> # scripts/checkpatch.pl -f kernel/mutex.c 2>&1 | grep memory
> #
> 
> so that appears to be completely broken :/
> 
> Joe, any clue what's up with that?

It's a CHK test, so it's only tested with --strict

$ scripts/checkpatch.pl -f --strict kernel/mutex.c 2>&1 | grep memory
CHECK: memory barrier without comment
CHECK: memory barrier without comment

It could be changed to WARN so it's always on.


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