Messages in this thread | | | Date | Tue, 26 Jan 2016 15:45:23 -0800 | Subject | Re: [v3,11/41] mips: reuse asm-generic/barrier.h | From | Linus Torvalds <> |
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On Tue, Jan 26, 2016 at 3:29 PM, Paul E. McKenney <paulmck@linux.vnet.ibm.com> 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.
Linus
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