From: Will Deacon <will.deacon@arm.com>
Date: Wed, 9 Jan 2013 11:08:10 +0000 (+0000)
Subject: arm64: mm: only wrprotect clean ptes if they are present
X-Git-Tag: v3.8-rc4~13^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=02522463c84748b3b8ad770f9424bcfa70a5b4c4;p=pandora-kernel.git

arm64: mm: only wrprotect clean ptes if they are present

Marking non-present ptes as read-only can corrupt file ptes, breaking
things like swap and file mappings.

This patch ensures that we only manipulate user pte bits when the pte
is marked present.

Cc: <stable@vger.kernel.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---

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