From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Thu, 22 Jul 2010 22:53:23 +0000 (+1000)
Subject: powerpc/mm: Move around testing of _PAGE_PRESENT in hash code
X-Git-Tag: v2.6.35~42^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ca91e6c09d656c6deb1f2bc5d57186c718106aa5;p=pandora-kernel.git

powerpc/mm: Move around testing of _PAGE_PRESENT in hash code

Instead of adding _PAGE_PRESENT to the access permission mask
in each low level routine independently, we add it once from
hash_page().

We also move the preliminary access check (the racy one before
the PTE is locked) up so it applies to the huge page case. This
duplicates code in __hash_page_huge() which we'll remove in a
subsequent patch to fix a race in there.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---

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