powerpc/thp: Use ACCESS_ONCE when loading pmdp
We would get wrong results in compiler recomputed old_pmd. Avoid that by using ACCESS_ONCE CC: <stable@vger.kernel.org> Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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