On Sun, 2016-01-10 at 13:56 +0200, Michael S. Tsirkin wrote:
> SMP-only barriers were missing in checkpatch.pl
>
> Refactor code slightly to make adding more variants easier.
[]
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -5116,7 +5116,25 @@ sub process {
> }
> }
> # 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)\(/) {
> +
> + my $barriers = qr{
> + mb|
> + rmb|
> + wmb|
> + read_barrier_depends
> + }x;
> + my $smp_barriers = qr{
> + store_release|
> + load_acquire|
> + store_mb|
> + ($barriers)
> + }x;
If I use a variable called $smp_barriers, I'd expect
it to actually be the smp_barriers, not to have to
prefix it with smp_ before using it.
my $smp_barriers = qr{
smp_store_release|
smp_load_acquire|
smp_store_mb|
smp_read_barrier_depends
}x;
or
my $smp_barriers = qr{
smp_(?:store_release|load_acquire|store_mb|read_barrier_depends)
}x;
> + my $all_barriers = qr{
> + $barriers|
> + smp_($smp_barriers)
> + }x;
And this shouldn't have a capture group.
my $all_barriers = qr{
$barriers|
$smp_barriers
}x;
> +
> + if ($line =~ /\b($all_barriers)\s*\(/) {
This doesn't need the capture group either (?:all_barriers)
> if (!ctx_has_comment($first_line, $linenr))
> {
> WARN("MEMORY_BARRIER",
> "memory barrier without
> comment\n" . $herecurr);
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