On Fri, Oct 09, 2015 at 01:02:46PM +0200, Peter Zijlstra wrote: > On Fri, Oct 09, 2015 at 10:40:39AM +0100, Will Deacon wrote: > > Stepping back a second, I believe that there are three cases: > > > > > > RELEASE X -> ACQUIRE Y (same CPU) > > * Needs a barrier on TSO architectures for full ordering > +PPC > > > UNLOCK X -> LOCK Y (same CPU) > > * Needs a barrier on PPC for full ordering > > > > RELEASE X -> ACQUIRE X (different CPUs) > * Fully ordered everywhere... > * ... but needs a barrier on TSO + PPC to become a full barrier > > > UNLOCK X -> ACQUIRE X (different CPUs) > > s/ACQUIRE/LOCK/ ? Yes, sorry. Will -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
