From: Steve Capper <steve.capper@arm.com>
Date: Fri, 8 Feb 2013 15:01:18 +0000 (+0200)
Subject: ARM: mm: correct pte_same behaviour for LPAE.
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b7e02d3ef168255d4375d4ea406a843dbb39581a;p=pandora-kernel.git

ARM: mm: correct pte_same behaviour for LPAE.

For 3 levels of paging the PTE_EXT_NG bit will be set for user
address ptes that are written to a page table but not for ptes
created with mk_pte.

This can cause some comparison tests made by pte_same to fail
spuriously and lead to other problems.

To correct this behaviour, we mask off PTE_EXT_NG for any pte that
is present before running the comparison.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Steve Capper <steve.capper@arm.com>
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