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mm/slub: Add debugging to verify correct cache use on kmem_cache_free()

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Add additional debugging to check that the objects is actually from the cache
the caller claims. Doing so currently trips up some other debugging code. It
takes a lot to infer from that what was happening.

Reviewed-by: Glauber Costa <glommer@parallels.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
[ penberg@kernel.org: Use pr_err() ]
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Christoph Lameter 2012-09-04 23:06:14 +00:00 committed by Pekka Enberg
parent e21827aadd
commit 79576102af
1 changed files with 7 additions and 0 deletions
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7
mm/slub.c
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@ -2614,6 +2614,13 @@ void kmem_cache_free(struct kmem_cache *s, void *x)
page = virt_to_head_page(x);
if (kmem_cache_debug(s) && page->slab != s) {
pr_err("kmem_cache_free: Wrong slab cache. %s but object"
" is from %s\n", page->slab->name, s->name);
WARN_ON_ONCE(1);
return;
}
slab_free(s, page, x, _RET_IP_);
trace_kmem_cache_free(_RET_IP_, x);