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powerpc: Return the new MSR from msr_check_and_set()

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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>
This commit is contained in:
Cyril Bur
2016-09-23 16:18:10 +10:00
committed by Michael Ellerman
parent b0f16b4698
commit 3cee070a13
2 changed files with 4 additions and 2 deletions
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2
arch/powerpc/include/asm/reg.h
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@@ -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)