Commit 79576102 authored Sep 04, 2012 by Christoph Lameter Committed by Pekka Enberg Sep 05, 2012

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



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>

parent e21827aa

mm/slub.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -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);