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| author | Yangtao Li <tiny.windzz@gmail.com> | 2018-12-28 00:33:01 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-12-28 12:11:46 -0800 |
| commit | 221d7da66cd3435b28a0404f62168d25f57aca4e (patch) | |
| tree | 74200b454eb480c27515ac64aea430b88ddb6c9a /mm/slab_common.c | |
| parent | 70306d9dce75abde855cefaf32b3f71eed8602a3 (diff) | |
| download | lwn-221d7da66cd3435b28a0404f62168d25f57aca4e.tar.gz lwn-221d7da66cd3435b28a0404f62168d25f57aca4e.zip | |
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.c | 4 |
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); } |