https://github.com/torvalds/linux
Revision abca7c4965845924f65d40e0aa1092bdd895e314 authored by Pravin B Shelar on 20 June 2012, 19:52:56 UTC, committed by Linus Torvalds on 20 June 2012, 21:39:35 UTC
On arches that do not support this_cpu_cmpxchg_double() slab_lock is used
to do atomic cmpxchg() on double word which contains page->_count.  The
page count can be changed from get_page() or put_page() without taking
slab_lock.  That corrupts page counter.

Fix it by moving page->_count out of cmpxchg_double data.  So that slub
does no change it while updating slub meta-data in struct page.

[akpm@linux-foundation.org: use standard comment layout, tweak comment text]
Reported-by: Amey Bhide <abhide@nicira.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 485802a
History
Tip revision: abca7c4965845924f65d40e0aa1092bdd895e314 authored by Pravin B Shelar on 20 June 2012, 19:52:56 UTC
mm: fix slab->page _count corruption when using slub
Tip revision: abca7c4
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