From: Steve Capper <steve.capper@linaro.org>
Date: Fri, 19 Apr 2013 14:49:31 +0000 (+0100)
Subject: arm64: mm: Correct show_pte behaviour
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~100^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4339e3f389081ea90e230a785bdbe10eccd02b71;p=pandora-kernel.git

arm64: mm: Correct show_pte behaviour

show_pte makes use of the *_none_or_clear_bad style functions. If a
pgd, pud or pmd is identified as being bad, it will then be cleared.

As show_pte appears to be called from either the user or kernel
fault handlers this side effect can lead to unpredictable behaviour;
especially as TLB entries are not invalidated.

This patch removes the page table sanitisation from show_pte. If a
bad pgd, pud or pmd is encountered it is left unmodified.

Signed-off-by: Steve Capper <steve.capper@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---

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