From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Thu, 24 Feb 2011 10:47:32 +0000 (+0000)
Subject: powerpc/mm: Make hpte_need_flush() safe for preemption
X-Git-Tag: v2.6.38-rc8~40^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f342552b917a18a7a1fa2c10625df85fac828c36;p=pandora-kernel.git

powerpc/mm: Make hpte_need_flush() safe for preemption

hpte_need_flush() might be called outside of a preempt section
when manipulating the kernel page tables, so we need to use the
appopriate variants of per-cpu variable accesses. There should
be no risk of being in the middle of a batch and a context
switch will flush any pending batch.

[Patch extracted from a larger patch in Peter's preemptible
 mmu_gather series]

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---

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