From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751369AbdJEQZ1 (ORCPT ); Thu, 5 Oct 2017 12:25:27 -0400 Received: from merlin.infradead.org ([205.233.59.134]:39434 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751216AbdJEQZ0 (ORCPT ); Thu, 5 Oct 2017 12:25:26 -0400 Date: Thu, 5 Oct 2017 18:25:14 +0200 From: Peter Zijlstra To: "Paul E. McKenney" Cc: linux-kernel@vger.kernel.org, mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com, oleg@redhat.com Subject: Re: [PATCH tip/core/rcu 1/9] rcu: Provide GP ordering in face of migrations and delays Message-ID: <20171005162514.moaa24mn2pkto5fv@hirez.programming.kicks-ass.net> References: <20171004212915.GA10089@linux.vnet.ibm.com> <1507152575-11055-1-git-send-email-paulmck@linux.vnet.ibm.com> <20171005094114.yoqkhndfwidczfqj@hirez.programming.kicks-ass.net> <20171005145513.GO3521@linux.vnet.ibm.com> <20171005153913.5wanmnfmi6i3byv7@hirez.programming.kicks-ass.net> <20171005161909.GS3521@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20171005161909.GS3521@linux.vnet.ibm.com> User-Agent: NeoMutt/20170609 (1.8.3) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Oct 05, 2017 at 09:19:09AM -0700, Paul E. McKenney wrote: > > Yes, the ordering does need to be visible to uninvolved CPUs, so > release-acquire is not necessarily strong enough. Why? Because I'm not at all seeing why it needs more. Your Changelog doesn't provide enough hints.