Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759542AbYCZAMI (ORCPT ); Tue, 25 Mar 2008 20:12:08 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752976AbYCZALz (ORCPT ); Tue, 25 Mar 2008 20:11:55 -0400 Received: from terminus.zytor.com ([198.137.202.10]:49306 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753809AbYCZALz (ORCPT ); Tue, 25 Mar 2008 20:11:55 -0400 Message-ID: <47E9948C.3070807@zytor.com> Date: Tue, 25 Mar 2008 17:10:52 -0700 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.12 (X11/20080226) MIME-Version: 1.0 To: Yinghai Lu CC: Ingo Molnar , Venki Pallipadi , Thomas Gleixner , Andrew Morton , kernel list , suresh.b.siddha@intel.com Subject: Re: [PATCH] x86: pat cpu feature bit setting for known cpus References: <200803242324.35357.yhlu.kernel@gmail.com> <47E9003B.5010002@zytor.com> <86802c440803251103taf4c8f2mb674c3d17f3c2345@mail.gmail.com> <20080325190851.GC30998@linux-os.sc.intel.com> <20080325200830.GB15330@elte.hu> <47E962AE.9040307@zytor.com> <47E9843A.1060702@zytor.com> <86802c440803251605w7021b60cmbc312eb9ca87d277@mail.gmail.com> <47E98572.704@zytor.com> <86802c440803251608v6f09f531x57d9688601cc84fd@mail.gmail.com> In-Reply-To: <86802c440803251608v6f09f531x57d9688601cc84fd@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 847 Lines: 24 Yinghai Lu wrote: > On Tue, Mar 25, 2008 at 4:06 PM, H. Peter Anvin wrote: >> Yinghai Lu wrote: >> >> >> >> By the way, I want to clarify: I didn't mean it was *intended* as >> >> vendor-lockin, just that it's an undesirable effect of this. >> > >> > if the PAT works, we may need to trim the memory according to MTRR, right? >> > >> >> That doesn't seem like it's specific to PAT? > > could page table to set WRBACK the range that is not covered by MTRR in e820.. > We have to trim anyway... lest we end up using uncached memory and then we're in a world of hurt. -hpa -- 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/