On Mon, Dec 09, 2013 at 05:28:02PM -0800, Paul E. McKenney wrote:
> diff --git a/arch/powerpc/include/asm/barrier.h b/arch/powerpc/include/asm/barrier.h
> index f89da808ce31..abf645799991 100644
> --- a/arch/powerpc/include/asm/barrier.h
> +++ b/arch/powerpc/include/asm/barrier.h
> @@ -84,4 +84,6 @@ do { \
> ___p1; \
> })
>
> +#define smp_mb__after_unlock_lock() do { } while (0)
> +
> #endif /* _ASM_POWERPC_BARRIER_H */
Didn't ben said ppc actually violates the current unlock+lock assumtion
and therefore this barrier woulnd't actually be a nop on ppc
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