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Date: Tue, 21 Oct 2014 20:00:54 -0400 (EDT) From: Mikulas Patocka <mpatocka@...hat.com> To: Joonsoo Kim <iamjoonsoo.kim@....com>, Christoph Lameter <cl@...ux.com>, Pekka Enberg <penberg@...nel.org>, David Rientjes <rientjes@...gle.com>, Andrew Morton <akpm@...ux-foundation.org> cc: David Rientjes <rientjes@...gle.com>, dm-devel@...hat.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org Subject: [PATCH] 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 694617474e33b8603fc76e090ed7d09376514b1a by not warning on duplicate cache names when the SLUB subsystem is used. Recently, cache merging was implemented the with SLAB subsystem too (patch 12220dea07f1ac6ac717707104773d771c3f3077), 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@...hat.com> --- mm/slab_common.c | 10 ---------- 1 file changed, 10 deletions(-) Index: linux-2.6/mm/slab_common.c =================================================================== --- linux-2.6.orig/mm/slab_common.c 2014-10-22 01:07:50.000000000 +0200 +++ linux-2.6/mm/slab_common.c 2014-10-22 01:08:02.000000000 +0200 @@ -93,16 +93,6 @@ static int kmem_cache_sanity_check(const 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 */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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