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slub: Add frozen check in __slab_alloc 

Verify that objects returned from __slab_alloc come from slab pages
in the correct state.

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Christoph Lameter 2012-05-09 10:09:52 -05:00 committed by Pekka Enberg
parent 6faa68337b
commit 507effeaba
1 changed files with 6 additions and 0 deletions
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6
mm/slub.c
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@ -2245,6 +2245,12 @@ redo:
stat(s, ALLOC_REFILL);
load_freelist:
/*
* freelist is pointing to the list of objects to be used.
* page is pointing to the page from which the objects are obtained.
* That page must be frozen for per cpu allocations to work.
*/
VM_BUG_ON(!c->page->frozen);
c->freelist = get_freepointer(s, freelist);
c->tid = next_tid(c->tid);
local_irq_restore(flags);