Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754602AbWKHR0t (ORCPT ); Wed, 8 Nov 2006 12:26:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754604AbWKHR0s (ORCPT ); Wed, 8 Nov 2006 12:26:48 -0500 Received: from emailhub.stusta.mhn.de ([141.84.69.5]:4877 "HELO mailout.stusta.mhn.de") by vger.kernel.org with SMTP id S1754602AbWKHR0s (ORCPT ); Wed, 8 Nov 2006 12:26:48 -0500 Date: Wed, 8 Nov 2006 18:26:50 +0100 From: Adrian Bunk To: Linus Torvalds Cc: Matthew Wilcox , Andi Kleen , Jeff Chua , Aaron Durbin , Andrew Morton , Linux Kernel Mailing List , gregkh@suse.de, linux-pci@atrey.karlin.mff.cuni.cz Subject: Re: [discuss] Re: 2.6.19-rc4: known unfixed regressions (v3) Message-ID: <20061108172650.GC4729@stusta.de> References: <20061107171143.GU27140@parisc-linux.org> <200611080839.46670.ak@suse.de> <20061108122237.GF27140@parisc-linux.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1644 Lines: 47 On Wed, Nov 08, 2006 at 08:05:18AM -0800, Linus Torvalds wrote: > > > On Wed, 8 Nov 2006, Matthew Wilcox wrote: > > > > On Wed, Nov 08, 2006 at 08:39:44AM +0100, Andi Kleen wrote: > > > ACPI knows the number of busses. > > > > But what if the number of busses increases later, eg by hotplugging > > a card with a PCI-PCI bridge on it? Or does it know the number of > > busses which can be supported by this machine's MMCONFIG region? > > ACPI will give the maximum number. > > However, in this case, the correct thing to do (always _has_ been) is to > not use ACPI for _anything_, but just read the base and the size of the > MMCONFIG region from the hardware itself. > > Anyway, I do not consider this a regression. MMCONFIG has _never_ worked > reliably. It has always been a case of "we can make it work on some > machines by making it break on others". It is a serious regression: The problem is that with the default CONFIG_PCI_GOANY, MMCONFIG is the _first_ method tried. In practice, this implies that nearly every system possibly affected will suffer from a MMCONFIG breakage like the one Jeff observed... > Linus cu Adrian -- "Is there not promise of rain?" Ling Tan asked suddenly out of the darkness. There had been need of rain for many days. "Only a promise," Lao Er said. Pearl S. Buck - Dragon Seed - 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/