linux-kernel - Re: [PATCH RFC tip/core/rcu 05/15] percpu: READ_ONCE() now implies smp_read_barrier

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Date:   Tue, 10 Oct 2017 08:30:47 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     linux-kernel@...r.kernel.org, mingo@...nel.org,
        torvalds@...ux-foundation.org, mark.rutland@....com,
        dhowells@...hat.com, linux-arch@...r.kernel.org,
        peterz@...radead.org, will.deacon@....com,
        Christoph Lameter <cl@...ux.com>
Subject: Re: [PATCH RFC tip/core/rcu 05/15] percpu: READ_ONCE() now implies
 smp_read_barrier_depends()

On Tue, Oct 10, 2017 at 07:08:13AM -0700, Tejun Heo wrote:
> On Mon, Oct 09, 2017 at 05:22:39PM -0700, Paul E. McKenney wrote:
> > Because READ_ONCE() now implies smp_read_barrier_depends(), this commit
> > removes the now-redundant smp_read_barrier_depends() following the
> > READ_ONCE() in __ref_is_percpu().
> > 
> > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > Cc: Tejun Heo <tj@...nel.org>
> > Cc: Christoph Lameter <cl@...ux.com>
> 
> Acked-by: Tejun Heo <tj@...nel.org>

Thank you, applied!

> Please feel free to route with other patches.  If this should be
> routed through the percpu tree, please let me know.

This depends on some other not-yet-finalized patch series, so if you
are OK with it, I will route them with that group of serieses.

							Thanx, Paul