On Fri, Jun 20, 2014 at 11:21:13AM -0700, Davidlohr Bueso wrote:
> diff --git a/arch/arc/include/asm/processor.h
> b/arch/arc/include/asm/processor.h
> index d99f9b3..8e1bf6b 100644
> --- a/arch/arc/include/asm/processor.h
> +++ b/arch/arc/include/asm/processor.h
> @@ -62,6 +62,8 @@ unsigned long thread_saved_pc(struct task_struct *t);
> #define cpu_relax() do { } while (0)
> #endif
>
> +#define arch_cpu_relax() cpu_relax()
> +
> #define copy_segments(tsk, mm) do { } while (0)
> #define release_segments(mm) do { } while (0)
I'm not at all sure that cpu_relax() definition ARC has is valid. We
rely on cpu_relax() being at least a barrier() all over the place, and
it doesn't need to be SMP only. You can have a UP wait loop waiting for
an interrupt for example.
Vineet?
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