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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-03-02 00:33:52 (GMT) |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-03-08 23:55:20 (GMT) |
| commit | d9ada91ae2969ae6b6dc3574fd08a6ebda5df766 (patch) | |
| tree | a4509657892acb0b853760d6d26729a913a5fc2b /arch/powerpc/include | |
| 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')
| -rw-r--r-- | arch/powerpc/include/asm/exception-64s.h | 2 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/hw_irq.h | 4 |
2 files changed, 3 insertions, 3 deletions
diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h index 7f4718c..70354af 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 diff --git a/arch/powerpc/include/asm/hw_irq.h b/arch/powerpc/include/asm/hw_irq.h index 531ba00..6c6fa95 100644 --- a/arch/powerpc/include/asm/hw_irq.h +++ b/arch/powerpc/include/asm/hw_irq.h @@ -68,8 +68,8 @@ static inline bool arch_irqs_disabled(void) #define __hard_irq_enable() asm volatile("wrteei 1" : : : "memory"); #define __hard_irq_disable() asm volatile("wrteei 0" : : : "memory"); #else -#define __hard_irq_enable() __mtmsrd(mfmsr() | MSR_EE, 1) -#define __hard_irq_disable() __mtmsrd(mfmsr() & ~MSR_EE, 1) +#define __hard_irq_enable() __mtmsrd(local_paca->kernel_msr | MSR_EE, 1) +#define __hard_irq_disable() __mtmsrd(local_paca->kernel_msr, 1) #endif #define hard_irq_disable() \ |