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| author | Cyril Bur <cyrilbur@gmail.com> | 2016-09-23 06:18:10 (GMT) |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-10-04 05:43:06 (GMT) |
| commit | 3cee070a13b141b8eb5727c3bfa9920092f87264 (patch) | |
| tree | 5c915a45afba8a0783c377c4e84988a27e64d380 | |
| parent | b0f16b46988fde02a1e32078f66a3059d7e53bfc (diff) | |
| download | linux-3cee070a13b141b8eb5727c3bfa9920092f87264.tar.xz | |
powerpc: Return the new MSR from msr_check_and_set()
msr_check_and_set() always performs a mfmsr() to determine if it needs
to perform an mtmsr(), as mfmsr() can be a costly operation
msr_check_and_set() could return the MSR now on the CPU to avoid
callers of msr_check_and_set having to make their own mfmsr() call.
Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
| -rw-r--r-- | arch/powerpc/include/asm/reg.h | 2 | ||||
| -rw-r--r-- | arch/powerpc/kernel/process.c | 4 |
2 files changed, 4 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h index 9dddabc..a8f63bc 100644 --- a/arch/powerpc/include/asm/reg.h +++ b/arch/powerpc/include/asm/reg.h @@ -1250,7 +1250,7 @@ static inline void mtmsr_isync(unsigned long val) : "memory") #endif -extern void msr_check_and_set(unsigned long bits); +extern unsigned long msr_check_and_set(unsigned long bits); extern bool strict_msr_control; extern void __msr_check_and_clear(unsigned long bits); static inline void msr_check_and_clear(unsigned long bits) diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 5029567..34ee5f2 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -111,7 +111,7 @@ static int __init enable_strict_msr_control(char *str) } early_param("ppc_strict_facility_enable", enable_strict_msr_control); -void msr_check_and_set(unsigned long bits) +unsigned long msr_check_and_set(unsigned long bits) { unsigned long oldmsr = mfmsr(); unsigned long newmsr; @@ -125,6 +125,8 @@ void msr_check_and_set(unsigned long bits) if (oldmsr != newmsr) mtmsr_isync(newmsr); + + return newmsr; } void __msr_check_and_clear(unsigned long bits) |