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powerpc: Replace mfmsr instructions with load from PACA kernel_msr field
authorBenjamin Herrenschmidt <benh@kernel.crashing.org>
Fri, 2 Mar 2012 00:33:52 +0000 (11:33 +1100)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Thu, 8 Mar 2012 23:55:20 +0000 (10:55 +1100)
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>

No differences found
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