From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Paul E. McKenney" Subject: Re: Compilers and RCU readers: Once more unto the breach! Date: Fri, 22 May 2015 06:11:26 -0700 Message-ID: <20150522131126.GF6776@linux.vnet.ibm.com> References: <20150520024148.GD6776@linux.vnet.ibm.com> <20150520114745.GC11498@arm.com> <20150520121522.GH6776@linux.vnet.ibm.com> <20150520154617.GE11498@arm.com> <20150520181606.GT6776@linux.vnet.ibm.com> <20150521192422.GC19204@arm.com> <20150521200212.GW6776@linux.vnet.ibm.com> <20150522064344.GA17518@gmail.com> <20150522104332.5FBFF33CA8@vlsi1.gnat.com> Reply-To: paulmck@linux.vnet.ibm.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from e35.co.us.ibm.com ([32.97.110.153]:40802 "EHLO e35.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756441AbbEVNLg (ORCPT ); Fri, 22 May 2015 09:11:36 -0400 Received: from /spool/local by e35.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 22 May 2015 07:11:36 -0600 Content-Disposition: inline In-Reply-To: <20150522104332.5FBFF33CA8@vlsi1.gnat.com> Sender: linux-arch-owner@vger.kernel.org List-ID: To: Richard Kenner Cc: mingo@kernel.org, akpm@linux-foundation.org, c++std-parallel@accu.org, dhowells@redhat.com, gcc@gcc.gnu.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, Mark.Batty@cl.cam.ac.uk, michaelw@ca.ibm.com, Peter.Sewell@cl.cam.ac.uk, peterz@infradead.org, Ramana.Radhakrishnan@arm.com, torvalds@linux-foundation.org, will.deacon@arm.com On Fri, May 22, 2015 at 06:43:32AM -0400, Richard Kenner wrote: > > (Assuming it's a goal of this standard to be human parseable to more > > than a few dozen people on the planet.) > > Unfortunately, that's rarely a goal of most standards. ;-) My experience does match Richard's, sad to say. There has been some vigorous discussion in another thread involving undefined behavior and value narrowing, which has resulted in some useful changes to Section 7.9. The updated document is here: http://www2.rdrop.com/users/paulmck/RCU/consume.2015.05.22a.pdf Thanx, Paul