Commit 1cfc05cb authored by Vineet Gupta's avatar Vineet Gupta
Browse files

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: default avatarPeter Zijlstra <peterz@infradead.org>
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent a6416f57
...@@ -57,11 +57,7 @@ struct task_struct; ...@@ -57,11 +57,7 @@ struct task_struct;
* A lot of busy-wait loops in SMP are based off of non-volatile data otherwise * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise
* get optimised away by gcc * get optimised away by gcc
*/ */
#ifdef CONFIG_SMP
#define cpu_relax() __asm__ __volatile__ ("" : : : "memory") #define cpu_relax() __asm__ __volatile__ ("" : : : "memory")
#else
#define cpu_relax() do { } while (0)
#endif
#define cpu_relax_lowlatency() cpu_relax() #define cpu_relax_lowlatency() cpu_relax()
......
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