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powerpc/thp: Use ACCESS_ONCE when loading pmdp
authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Wed, 13 Aug 2014 07:02:02 +0000 (12:32 +0530)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Wed, 13 Aug 2014 08:20:41 +0000 (18:20 +1000)
We would get wrong results in compiler recomputed old_pmd. Avoid
that by using ACCESS_ONCE

CC: <stable@vger.kernel.org>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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