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| author |  Nicholas Piggin <npiggin@gmail.com>
| 2017-06-06 23:08:31 +1000 |
|---|---|---|
| committer |  Michael Ellerman <mpe@ellerman.id.au>
| 2017-07-02 20:40:17 +1000 |
| commit | ede8e2bbb0eb3370e4dc5484b40eb22850a09b92 (patch) | |
| tree | 495e7183076966dd9ff7ebe2763dd624da0cc354 /arch/powerpc/include/asm/processor.h | |
| parent | spin loop primitives for busy waiting (diff) | |
| download | linux-ede8e2bbb0eb3370e4dc5484b40eb22850a09b92.tar.gz linux-ede8e2bbb0eb3370e4dc5484b40eb22850a09b92.tar.bz2 linux-ede8e2bbb0eb3370e4dc5484b40eb22850a09b92.zip | |
powerpc/64: implement spin loop primitives
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/processor.h')
| -rw-r--r-- | arch/powerpc/include/asm/processor.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h index c49165a7439c..832775771bd3 100644 --- a/arch/powerpc/include/asm/processor.h +++ b/arch/powerpc/include/asm/processor.h @@ -428,6 +428,26 @@ static inline unsigned long __pack_fe01(unsigned int fpmode) #ifdef CONFIG_PPC64 #define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0) + +#define spin_begin() HMT_low() + +#define spin_cpu_relax() barrier() + +#define spin_cpu_yield() spin_cpu_relax() + +#define spin_end() HMT_medium() + +#define spin_until_cond(cond) \ +do { \ + if (unlikely(!(cond))) { \ + spin_begin(); \ + do { \ + spin_cpu_relax(); \ + } while (!(cond)); \ + spin_end(); \ + } \ +} while (0) + #else #define cpu_relax() barrier() #endif |