Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750701AbVKMVBP (ORCPT ); Sun, 13 Nov 2005 16:01:15 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750705AbVKMVBO (ORCPT ); Sun, 13 Nov 2005 16:01:14 -0500 Received: from clock-tower.bc.nu ([81.2.110.250]:14552 "EHLO lxorguk.ukuu.org.uk") by vger.kernel.org with ESMTP id S1750701AbVKMVBO (ORCPT ); Sun, 13 Nov 2005 16:01:14 -0500 Subject: Re: [PATCH 1/10] Cr4 is valid on some 486s From: Alan Cox To: Linus Torvalds Cc: Andi Kleen , Dave Jones , Zachary Amsden , Pavel Machek , Andrew Morton , Linux Kernel Mailing List , "H. Peter Anvin" , Zwane Mwaikambo , Pratap Subrahmanyam , Christopher Li , "Eric W. Biederman" , Ingo Molnar In-Reply-To: References: <200511100032.jAA0WgUq027712@zach-dev.vmware.com> <1131902775.25311.16.camel@localhost.localdomain> <200511132000.45836.ak@suse.de> <1131910902.25311.21.camel@localhost.localdomain> Content-Type: text/plain Content-Transfer-Encoding: 7bit Date: Sun, 13 Nov 2005 21:32:10 +0000 Message-Id: <1131917530.25311.27.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 (2.2.3-2.fc4) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 640 Lines: 15 On Sul, 2005-11-13 at 11:36 -0800, Linus Torvalds wrote: > The thing is, we wouldn't ever remove _all_ lock prefixes. Only the ones > that already depend on SMP. > > So the memory barriers etc that have lock prefixes even on UP would be > totally untouched. That much makes sense. Having some magic MSR reloaded to turn lock effects off is a bit more of a problem for ECC scrubbing however. - 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/