diff options
| author | Grygorii Maistrenko <grygoriimkd@gmail.com> | 2017-02-22 15:40:59 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-21 17:09:05 +0200 |
| commit | 9ac38e30f2b01270f0fc896fd2b90e42cd8464ec (patch) | |
| tree | 8907c5c19687b4ebd9bde049f4505f753b6e6b06 | |
| parent | 315689d2e202a5e8066126c45e563b4b2e60c186 (diff) | |
slub: do not merge cache if slub_debug contains a never-merge flag
[ Upstream commit c6e28895a4372992961888ffaadc9efc643b5bfe ]
In case CONFIG_SLUB_DEBUG_ON=n, find_mergeable() gets debug features from
commandline but never checks if there are features from the
SLAB_NEVER_MERGE set.
As a result selected by slub_debug caches are always mergeable if they
have been created without a custom constructor set or without one of the
SLAB_* debug features on.
This moves the SLAB_NEVER_MERGE check below the flags update from
commandline to make sure it won't merge the slab cache if one of the debug
features is on.
Link: http://lkml.kernel.org/r/20170101124451.GA4740@lp-laptop-d
Signed-off-by: Grygorii Maistrenko <grygoriimkd@gmail.com>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | mm/slab_common.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/mm/slab_common.c b/mm/slab_common.c index bec2fce9fafc..01e7246de8df 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -250,7 +250,7 @@ struct kmem_cache *find_mergeable(size_t size, size_t align, { struct kmem_cache *s; - if (slab_nomerge || (flags & SLAB_NEVER_MERGE)) + if (slab_nomerge) return NULL; if (ctor) @@ -261,6 +261,9 @@ struct kmem_cache *find_mergeable(size_t size, size_t align, size = ALIGN(size, align); flags = kmem_cache_flags(size, flags, name, NULL); + if (flags & SLAB_NEVER_MERGE) + return NULL; + list_for_each_entry_reverse(s, &slab_caches, list) { if (slab_unmergeable(s)) continue; |