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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-03-02 04:33:52 +0400 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-03-09 03:55:20 +0400 |
| commit | d9ada91ae2969ae6b6dc3574fd08a6ebda5df766 (patch) | |
| tree | a4509657892acb0b853760d6d26729a913a5fc2b /arch/powerpc/include/asm/exception-64s.h | |
| parent | 9424fabf8617c15e18a5ffd29bc3bcfa36620473 (diff) | |
| download | linux-d9ada91ae2969ae6b6dc3574fd08a6ebda5df766.tar.xz | |
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>
Diffstat (limited to 'arch/powerpc/include/asm/exception-64s.h')
| -rw-r--r-- | arch/powerpc/include/asm/exception-64s.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h index 7f4718c4f04a..70354af0740e 100644 --- a/arch/powerpc/include/asm/exception-64s.h +++ b/arch/powerpc/include/asm/exception-64s.h @@ -298,7 +298,7 @@ label##_hv: \ /* Exception addition: Keep interrupt state */ #define ENABLE_INTS \ - mfmsr r11; \ + ld r11,PACAKMSR(r13); \ ld r12,_MSR(r1); \ rlwimi r11,r12,0,MSR_EE; \ mtmsrd r11,1 |