linux-kernel - Re: [PATCH RFC tip/core/rcu 0/15] Remove to-be-unneeded smp_read_barrier

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Message-ID: <26479.1507724463@warthog.procyon.org.uk>
Date:   Wed, 11 Oct 2017 13:21:03 +0100
From:   David Howells <dhowells@...hat.com>
To:     paulmck@...ux.vnet.ibm.com
Cc:     dhowells@...hat.com, linux-kernel@...r.kernel.org,
        mark.rutland@....com, linux-arch@...r.kernel.org,
        viro@...iv.linux.org.uk, tj@...nel.org, cl@...ux.com,
        davem@...emloft.net, peterz@...radead.org, mingo@...hat.com,
        rostedt@...dmis.org, akpm@...ux-foundation.org, corbet@....net,
        james.l.morris@...cle.com, torvalds@...ux-foundation.org
Subject: Re: [PATCH RFC tip/core/rcu 0/15] Remove to-be-unneeded smp_read_barrier_depends()

Paul E. McKenney <paulmck@...ux.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?

David