Messages in this thread | | | Date | Tue, 10 Dec 2013 13:37:26 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH v5 tip/core/locking 6/7] locking: Add an smp_mb__after_unlock_lock() for UNLOCK+LOCK barrier |
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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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