From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758062AbZEBPz1 (ORCPT ); Sat, 2 May 2009 11:55:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755713AbZEBPzS (ORCPT ); Sat, 2 May 2009 11:55:18 -0400 Received: from tomts40.bellnexxia.net ([209.226.175.97]:63853 "EHLO tomts40-srv.bellnexxia.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755272AbZEBPzQ (ORCPT ); Sat, 2 May 2009 11:55:16 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AuIKAB8H/ElMQW1W/2dsb2JhbACBUJVvtg2COIFFBQ Date: Sat, 2 May 2009 11:55:14 -0400 From: Mathieu Desnoyers To: Pavel Machek Cc: akpm@linux-foundation.org, Ingo Molnar , linux-kernel@vger.kernel.org, mark.langsdorf@amd.com, arekm@maven.pl, "H. Peter Anvin" , Andi Kleen , Avi Kivity Subject: Re: [patch 2/2] x86 amd fix cmpxchg read acquire barrier Message-ID: <20090502155514.GA18847@Krystal> References: <20090422201852.092307236@polymtl.ca> <20090422202453.829846363@polymtl.ca> <20090425081914.GD2428@ucw.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline In-Reply-To: <20090425081914.GD2428@ucw.cz> X-Editor: vi X-Info: http://krystal.dyndns.org:8080 X-Operating-System: Linux/2.6.21.3-grsec (i686) X-Uptime: 11:54:03 up 63 days, 12:20, 2 users, load average: 0.31, 0.31, 0.30 User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Pavel Machek (pavel@ucw.cz) wrote: > On Wed 2009-04-22 16:18:54, Mathieu Desnoyers wrote: > > http://google-perftools.googlecode.com/svn-history/r48/trunk/src/base/atomicops-internals-x86.cc > > > > says > > > > " // Opteron Rev E has a bug in which on very rare occasions a locked > > // instruction doesn't act as a read-acquire barrier if followed by a > > // non-locked read-modify-write instruction. Rev F has this bug in > > // pre-release versions, but not in versions released to customers, > > // so we test only for Rev E, which is family 15, model 32..63 inclusive. > > Could we be more careful here and catch the F pre-release versions, > too? Stepping should help there... > Yes, I guess for F pre-releases we're stucked unless AMD provides more information. Dtrace did not seem to bother about F pre-release versions though, neither did Google. Mathieu > -- > (english) http://www.livejournal.com/~pavelmachek > (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- Mathieu Desnoyers OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68