Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752511Ab3JaEf5 (ORCPT ); Thu, 31 Oct 2013 00:35:57 -0400 Received: from e7.ny.us.ibm.com ([32.97.182.137]:37807 "EHLO e7.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751888Ab3JaEfz (ORCPT ); Thu, 31 Oct 2013 00:35:55 -0400 Date: Wed, 30 Oct 2013 21:33:46 -0700 From: "Paul E. McKenney" To: Peter Zijlstra Cc: Victor Kaplansky , Anton Blanchard , Benjamin Herrenschmidt , Frederic Weisbecker , LKML , Linux PPC dev , Mathieu Desnoyers , Michael Ellerman , Michael Neuling , Oleg Nesterov Subject: Re: perf events ring buffer memory barrier on powerpc Message-ID: <20131031043346.GR4126@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20131025173749.GG19466@laptop.lan> <20131028132634.GO19466@laptop.lan> <20131028163418.GD4126@linux.vnet.ibm.com> <20131028201735.GA15629@redhat.com> <20131030092725.GL4126@linux.vnet.ibm.com> <20131030155116.GO16117@laptop.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20131030155116.GO16117@laptop.programming.kicks-ass.net> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13103104-5806-0000-0000-00002345DCE0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 957 Lines: 26 On Wed, Oct 30, 2013 at 04:51:16PM +0100, Peter Zijlstra wrote: > On Wed, Oct 30, 2013 at 03:28:54PM +0200, Victor Kaplansky wrote: > > one of the authors of Documentation/memory-barriers.txt is on cc: list ;-) > > > > Disclaimer: it is anyway impossible to prove lack of *any* problem. > > > > Having said that, lets look into an example in > > Documentation/circular-buffers.txt: > > > > > We can see that authors of the document didn't put any memory barrier > > Note that both documents have the same author list ;-) > > Anyway, I didn't know about the circular thing, I suppose I should use > CIRC_SPACE() thing :-) Interesting that we didn't seem to supply a definition... ;-) Thanx, Paul -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/