Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S939371AbXHIN4s (ORCPT ); Thu, 9 Aug 2007 09:56:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S934827AbXHIN4P (ORCPT ); Thu, 9 Aug 2007 09:56:15 -0400 Received: from moutng.kundenserver.de ([212.227.126.171]:51224 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762128AbXHIN4J convert rfc822-to-8bit (ORCPT ); Thu, 9 Aug 2007 09:56:09 -0400 From: Arnd Bergmann To: Chris Snook Subject: Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures Date: Thu, 9 Aug 2007 14:41:25 +0200 User-Agent: KMail/1.9.6 Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, torvalds@linux-foundation.org, netdev@vger.kernel.org, akpm@linux-foundation.org, ak@suse.de, heiko.carstens@de.ibm.com, davem@davemloft.net, schwidefsky@de.ibm.com, wensong@linux-vs.org, horms@verge.net.au, wjiang@resilience.com, cfriesen@nortel.com, zlynx@acm.org, rpjday@mindspring.com, jesper.juhl@gmail.com References: <20070809131423.GA9927@shell.boston.redhat.com> In-Reply-To: <20070809131423.GA9927@shell.boston.redhat.com> X-Face: >j"dOR3XO=^3iw?0`(E1wZ/&le9!.ok[JrI=S~VlsF~}"P\+jx.GT@=?utf-8?q?=0A=09-oaEG?=,9Ba>v;3>:kcw#yO5?B:l{(Ln.2)=?utf-8?q?=27=7Dfw07+4-=26=5E=7CScOpE=3F=5D=5EXdv=5B/zWkA7=60=25M!DxZ=0A=09?= =?utf-8?q?8MJ=2EU5?="hi+2yT(k`PF~Zt;tfT,i,JXf=x@eLP{7B:"GyA\=UnN) =?utf-8?q?=26=26qdaA=3A=7D-Y*=7D=3A3YvzV9=0A=09=7E=273a=7E7I=7CWQ=5D?=<50*%U-6Ewmxfzdn/CK_E/ouMU(r?FAQG/ev^JyuX.%(By`" =?utf-8?q?L=5F=0A=09H=3Dbj?=)"y7*XOqz|SS"mrZ$`Q_syCd MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 8BIT Content-Disposition: inline Message-Id: <200708091441.28511.arnd@arndb.de> X-Provags-ID: V01U2FsdGVkX1/E4RqeTZgwG4Pkbo42kHlXP1kIpIFgvtfoaBy 6GQodJ77MfsqM+atxadrkQvXYH+2j7f8upY2J+/0EtygwcbVGx WpUnPErEBRCTf55XwnZuQ== Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 930 Lines: 20 On Thursday 09 August 2007, Chris Snook wrote: > This patchset makes the behavior of atomic_read uniform by removing the > volatile keyword from all atomic_t and atomic64_t definitions that currently > have it, and instead explicitly casts the variable as volatile in > atomic_read(). ?This leaves little room for creative optimization by the > compiler, and is in keeping with the principles behind "volatile considered > harmful". > Just an idea: since all architectures already include asm-generic/atomic.h, why not move the definitions of atomic_t and atomic64_t, as well as anything that does not involve architecture specific inline assembly into the generic header? Arnd <>< - 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/