From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756461AbdJJOIU (ORCPT ); Tue, 10 Oct 2017 10:08:20 -0400 Received: from mail-qt0-f193.google.com ([209.85.216.193]:38674 "EHLO mail-qt0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755888AbdJJOIQ (ORCPT ); Tue, 10 Oct 2017 10:08:16 -0400 X-Google-Smtp-Source: AOwi7QDLZcUDKPt5Og8XVl6CfqyWT7/2079P/zdmmVouz5647mV59TB9G41gQaWJ8nR+p4hD4Inqgg== Date: Tue, 10 Oct 2017 07:08:13 -0700 From: Tejun Heo To: "Paul E. McKenney" Cc: linux-kernel@vger.kernel.org, mingo@kernel.org, torvalds@linux-foundation.org, mark.rutland@arm.com, dhowells@redhat.com, linux-arch@vger.kernel.org, peterz@infradead.org, will.deacon@arm.com, Christoph Lameter Subject: Re: [PATCH RFC tip/core/rcu 05/15] percpu: READ_ONCE() now implies smp_read_barrier_depends() Message-ID: <20171010140813.GK3301751@devbig577.frc2.facebook.com> References: <20171010001951.GA6476@linux.vnet.ibm.com> <1507594969-8347-5-git-send-email-paulmck@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1507594969-8347-5-git-send-email-paulmck@linux.vnet.ibm.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 > Cc: Tejun Heo > Cc: Christoph Lameter Acked-by: Tejun Heo Please feel free to route with other patches. If this should be routed through the percpu tree, please let me know. Thanks. -- tejun