Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750972AbVKNHqj (ORCPT ); Mon, 14 Nov 2005 02:46:39 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750971AbVKNHqj (ORCPT ); Mon, 14 Nov 2005 02:46:39 -0500 Received: from pentafluge.infradead.org ([213.146.154.40]:63429 "EHLO pentafluge.infradead.org") by vger.kernel.org with ESMTP id S1750958AbVKNHqi (ORCPT ); Mon, 14 Nov 2005 02:46:38 -0500 Subject: Re: [PATCH 1/10] Cr4 is valid on some 486s From: Arjan van de Ven To: Alan Cox Cc: Linus Torvalds , 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: <1131917530.25311.27.camel@localhost.localdomain> References: <200511100032.jAA0WgUq027712@zach-dev.vmware.com> <1131902775.25311.16.camel@localhost.localdomain> <200511132000.45836.ak@suse.de> <1131910902.25311.21.camel@localhost.localdomain> <1131917530.25311.27.camel@localhost.localdomain> Content-Type: text/plain Date: Mon, 14 Nov 2005 08:46:13 +0100 Message-Id: <1131954373.2821.1.camel@laptopd505.fenrus.org> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 (2.2.3-2.fc4) Content-Transfer-Encoding: 7bit X-Spam-Score: 1.8 (+) X-Spam-Report: SpamAssassin version 3.0.4 on pentafluge.infradead.org summary: Content analysis details: (1.8 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.1 RCVD_IN_SORBS_DUL RBL: SORBS: sent directly from dynamic IP address [213.93.14.173 listed in dnsbl.sorbs.net] 1.7 RCVD_IN_NJABL_DUL RBL: NJABL: dialup sender did non-local SMTP [213.93.14.173 listed in combined.njabl.org] X-SRS-Rewrite: SMTP reverse-path rewritten from by pentafluge.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 891 Lines: 21 On Sun, 2005-11-13 at 21:32 +0000, Alan Cox wrote: > 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. well... you can expect many bioses to have done the MSR hack for you already... so if you can't cope with that you have to set the MSR to the value you want it to have regardless. - 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/