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authorMikulas Patocka <mpatocka@redhat.com>2014-10-29 22:50:55 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2014-10-30 00:33:15 +0100
commit8aba7e0a2c02355f9a7dec629635cb7093fe0508 (patch)
treeb3d17bfeead12b6642ff0292a04e42bb21e5cf07 /mm
parentocfs2: fix d_splice_alias() return code checking (diff)
downloadlinux-8aba7e0a2c02355f9a7dec629635cb7093fe0508.tar.xz
linux-8aba7e0a2c02355f9a7dec629635cb7093fe0508.zip
mm/slab_common: don't check for duplicate cache names
The SLUB cache merges caches with the same size and alignment and there was long standing bug with this behavior: - create the cache named "foo" - create the cache named "bar" (which is merged with "foo") - delete the cache named "foo" (but it stays allocated because "bar" uses it) - create the cache named "foo" again - it fails because the name "foo" is already used That bug was fixed in commit 694617474e33 ("slab_common: fix the check for duplicate slab names") by not warning on duplicate cache names when the SLUB subsystem is used. Recently, cache merging was implemented the with SLAB subsystem too, in 12220dea07f1 ("mm/slab: support slab merge")). Therefore we need stop checking for duplicate names even for the SLAB subsystem. This patch fixes the bug by removing the check. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Acked-by: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.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>
Diffstat (limited to 'mm')
-rw-r--r--mm/slab_common.c10
1 files changed, 0 insertions, 10 deletions
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 3a6e0cfdf03a..406944207b61 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -93,16 +93,6 @@ static int kmem_cache_sanity_check(const char *name, size_t size)
s->object_size);
continue;
}
-
-#if !defined(CONFIG_SLUB)
- if (!strcmp(s->name, name)) {
- pr_err("%s (%s): Cache name already exists.\n",
- __func__, name);
- dump_stack();
- s = NULL;
- return -EINVAL;
- }
-#endif
}
WARN_ON(strchr(name, ' ')); /* It confuses parsers */