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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2012-03-02 11:33:52 +1100
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2012-03-09 10:55:20 +1100
commitd9ada91ae2969ae6b6dc3574fd08a6ebda5df766 (patch)
treea4509657892acb0b853760d6d26729a913a5fc2b /arch/powerpc/kvm/book3s_interrupts.S
parent9424fabf8617c15e18a5ffd29bc3bcfa36620473 (diff)
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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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