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(parent: 9424fab) | patch
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)
commitd9ada91ae2969ae6b6dc3574fd08a6ebda5df766
treea4509657892acb0b853760d6d26729a913a5fc2btree | snapshot (tar.gz zip)
parent9424fabf8617c15e18a5ffd29bc3bcfa36620473commit | diff
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>
arch/powerpc/include/asm/exception-64s.h diff | blob | blame | history
arch/powerpc/include/asm/hw_irq.h diff | blob | blame | history
arch/powerpc/kernel/entry_64.S diff | blob | blame | history
arch/powerpc/kernel/exceptions-64s.S diff | blob | blame | history