From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Fri, 2 Mar 2012 00:33:52 +0000 (+1100)
Subject: powerpc: Replace mfmsr instructions with load from PACA kernel_msr field
X-Git-Tag: v3.4-rc1~159^2~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d9ada91ae2969ae6b6dc3574fd08a6ebda5df766;p=pandora-kernel.git

powerpc: Replace mfmsr instructions with load from PACA kernel_msr field

On 64-bit, the mfmsr instruction can be quite slow, slower
than loading a field from the cache-hot PACA, which happens
to already contain the value we want in most cases.

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