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authorYangtao Li <tiny.windzz@gmail.com>2018-12-28 11:33:01 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-12-28 23:11:46 +0300
commit221d7da66cd3435b28a0404f62168d25f57aca4e (patch)
tree74200b454eb480c27515ac64aea430b88ddb6c9a /mm/slab_common.c
parent70306d9dce75abde855cefaf32b3f71eed8602a3 (diff)
downloadlinux-221d7da66cd3435b28a0404f62168d25f57aca4e.tar.xz
mm, slab: remove unnecessary unlikely()
WARN_ON() already contains an unlikely(), so it's not necessary to use unlikely. Also change WARN_ON() back to WARN_ON_ONCE() to avoid potentially spamming dmesg with user-triggerable large allocations. [akpm@linux-foundation.org: s/WARN_ON/WARN_ON_ONCE/, per Vlastimil] Link: http://lkml.kernel.org/r/20181104125028.3572-1-tiny.windzz@gmail.com Signed-off-by: Yangtao Li <tiny.windzz@gmail.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: David Rientjes <rientjes@google.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slab_common.c')
-rw-r--r--mm/slab_common.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/mm/slab_common.c b/mm/slab_common.c
index bc24100682b0..70b0cc85db67 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -1029,10 +1029,8 @@ struct kmem_cache *kmalloc_slab(size_t size, gfp_t flags)
index = size_index[size_index_elem(size)];
} else {
- if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) {
- WARN_ON(1);
+ if (WARN_ON_ONCE(size > KMALLOC_MAX_CACHE_SIZE))
return NULL;
- }
index = fls(size - 1);
}