Messages in this thread | | | Date | Wed, 11 Oct 2017 05:56:36 -0700 | From | "Paul E. McKenney" <> | Subject | Re: [PATCH RFC tip/core/rcu 0/15] Remove to-be-unneeded smp_read_barrier_depends() |
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On Wed, Oct 11, 2017 at 01:21:03PM +0100, David Howells wrote: > Paul E. McKenney <paulmck@linux.vnet.ibm.com> wrote: > > > Will Deacon has proposed adding smp_read_barrier_depends() to READ_ONCE(), > > which would mean that quite a few instances of smp_read_barrier_depends() > > would become redundant. > > It's not clear from you description where the barrier is added in relation to > the read: before, after or both?
After, similar to lockless_dereference(). Of course, there is not really a barrier except for on Alpha.
Thanx, Paul
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