On Tue, Jan 26, 2016 at 03:45:23PM -0800, Linus Torvalds wrote: > On Tue, Jan 26, 2016 at 3:29 PM, Paul E. McKenney > <paulmck@xxxxxxxxxxxxxxxxxx> wrote: > > > > No trailing data-dependent read, so agreed, no smp_read_barrier_depends() > > needed. That said, I believe that we should encourage rcu_dereference*() > > or lockless_dereference() instead of READ_ONCE() for documentation > > reasons, though. > > I agree that that is likely the right thing to do in pretty much all situations. > > In theory, there might be performance situations where we'd want to > actively avoid the smp_read_barrier_depends() inherent in those, but > considering that it's only a performance issue on alpha, and we > probably have all of two or three people using Linux on alpha, it's a > pretty theoretical performance worry. Agreed! Thanx, Paul -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
