From: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Date: Mon, 30 Mar 2015 05:09:12 +0000 (+0530)
Subject: KVM: PPC: Use READ_ONCE when dereferencing pte_t pointer
X-Git-Tag: omap-for-v4.2/o2_dc~16^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5e1d44aef1673b504dde475aa714b1bdb9b875c4;p=pandora-kernel.git

KVM: PPC: Use READ_ONCE when dereferencing pte_t pointer

pte can get updated from other CPUs as part of multiple activities
like THP split, huge page collapse, unmap. We need to make sure we
don't reload the pte value again and again for different checks.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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