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arm64: mm: only wrprotect clean ptes if they are present
authorWill Deacon <will.deacon@arm.com>
Wed, 9 Jan 2013 11:08:10 +0000 (11:08 +0000)
committerCatalin Marinas <catalin.marinas@arm.com>
Thu, 10 Jan 2013 10:43:44 +0000 (10:43 +0000)
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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