Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933343AbZJLVwZ (ORCPT ); Mon, 12 Oct 2009 17:52:25 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932725AbZJLVwY (ORCPT ); Mon, 12 Oct 2009 17:52:24 -0400 Received: from terminus.zytor.com ([198.137.202.10]:47055 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758530AbZJLVwY (ORCPT ); Mon, 12 Oct 2009 17:52:24 -0400 Message-ID: <4AD3A460.6060505@zytor.com> Date: Mon, 12 Oct 2009 14:49:20 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.1) Gecko/20090814 Fedora/3.0-2.6.b3.fc11 Thunderbird/3.0b3 MIME-Version: 1.0 To: Bjorn Helgaas CC: Ingo Molnar , Yinghai Lu , Jesse Barnes , "linux-kernel@vger.kernel.org" , "linux-pci@vger.kernel.org" , Linus Torvalds , Thomas Gleixner Subject: Re: [PATCH] x86/pci: intel bus root res with IOH reading -v2 References: <4AC97C00.7090503@kernel.org> <200910061257.54877.bjorn.helgaas@hp.com> <20091012203453.GC7648@elte.hu> <200910121545.47794.bjorn.helgaas@hp.com> In-Reply-To: <200910121545.47794.bjorn.helgaas@hp.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1108 Lines: 26 On 10/12/2009 02:45 PM, Bjorn Helgaas wrote: > For the patch in question, we don't even have a root cause for the bug > (or at least, I couldn't decipher it from the changelog). There's a > reference to _CRS being wrong, but we don't currently use _CRS for > x86 host bridges. > > But in general, my objection is that even if BIOS provides perfectly > valid information about host bridge apertures, the the fact that Linux > ignores that information means we have to add this sort of vendor- > specific code every time we trip over something. And we're tripping > over things quite often. > > Windows consumes this _CRS information, so while I grant there are > certainly BIOS bugs there, I think most of the bugs are actually in > Linux. I think the right policy for most if not all things should be "use the BIOS information unless we know better." -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/