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>
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@ -57,11 +57,7 @@ struct task_struct;
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* A lot of busy-wait loops in SMP are based off of non-volatile data otherwise
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* get optimised away by gcc
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*/
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#ifdef CONFIG_SMP
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#define cpu_relax() __asm__ __volatile__ ("" : : : "memory")
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#else
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#define cpu_relax() do { } while (0)
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#endif
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#define cpu_relax_lowlatency() cpu_relax()
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