Re: [PATCH v5 tip/core/locking 6/7] locking: Add ansmp_mb__after_unlock_lock() for UNLOCK+LOCK barrier

[Peter Zijlstra]

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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