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| author | Vineet Gupta <vgupta@synopsys.com> | 2015-11-09 17:48:34 +0530 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2015-11-14 13:12:30 +0530 |
| commit | 1cfc05cbe2c9757c6cc36804df96e3ed28e940a1 (patch) | |
| tree | c9567d20752208af3678b3276bc3dac72706d0ab | |
| parent | a6416f57ce57fb390b6ee30b12c01c29032a26af (diff) | |
| download | lwn-1cfc05cbe2c9757c6cc36804df96e3ed28e940a1.tar.gz lwn-1cfc05cbe2c9757c6cc36804df96e3ed28e940a1.zip | |
ARC: cpu_relax() to be compiler barrier even for UP
cpu_relax() on ARC has been barrier only for SMP (and no-op for UP). Per
recent discussions, it is safer to make it a compiler barrier
unconditionally.
Link: http://lkml.kernel.org/r/53A7D3AA.9020100@synopsys.com
Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| -rw-r--r-- | arch/arc/include/asm/processor.h | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/arch/arc/include/asm/processor.h b/arch/arc/include/asm/processor.h index 44545354e9e8..1d694c1ef6d6 100644 --- a/arch/arc/include/asm/processor.h +++ b/arch/arc/include/asm/processor.h @@ -57,11 +57,7 @@ struct task_struct; * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise * get optimised away by gcc */ -#ifdef CONFIG_SMP #define cpu_relax() __asm__ __volatile__ ("" : : : "memory") -#else -#define cpu_relax() do { } while (0) -#endif #define cpu_relax_lowlatency() cpu_relax() |