Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757773Ab0LOAMm (ORCPT ); Tue, 14 Dec 2010 19:12:42 -0500 Received: from g4t0014.houston.hp.com ([15.201.24.17]:20517 "EHLO g4t0014.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755120Ab0LOAMk (ORCPT ); Tue, 14 Dec 2010 19:12:40 -0500 From: Bjorn Helgaas To: Ingo Molnar Subject: Re: [PATCH 1/5] resources: add arch hook for preventing allocation in reserved areas Date: Tue, 14 Dec 2010 17:09:45 -0700 User-Agent: KMail/1.13.2 (Linux/2.6.32-26-generic; KDE/4.4.2; x86_64; ; ) Cc: "Rafael J. Wysocki" , Jesse Barnes , Linus Torvalds , Len Brown , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, "H. Peter Anvin" , Thomas Gleixner , Adam Belay , Matthew Garrett , Dan Williams References: <20101208213606.13026.47657.stgit@bob.kio> <20101213054334.GA15856@helgaas.com> <20101213134739.GA27941@elte.hu> In-Reply-To: <20101213134739.GA27941@elte.hu> MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <201012141709.46610.bjorn.helgaas@hp.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1697 Lines: 36 On Monday, December 13, 2010 06:47:39 am Ingo Molnar wrote: > > * Bjorn Helgaas wrote: > > > > OK, so I guess the best thing we can do for 2.6.37 is to revert 1af3c2e (x86: > > > allocate space within a region top-down), right? > > > > That's a possibility, but I'm not sure it's the best. It would avoid the nx6325 > > landmine, but we could easily step on a different one on other machines. > > > > If Windows uses the end of available space first, that's the best-tested > > territory, and I think it's better to try to stay in it rather revert 1af3c2e and > > start mapping different territory that really isn't tested by Windows at all. > > > > On the nx6325, we stray out of that tested territory because Linux opens windows > > on subtractive-decode bridges and allocates more space to CardBus bridges. > > > > I think it'd be fairly simple to leave subtractive-decode bridges alone, and that > > might make the nx6325 work well enough for .37, even without the quirk. This > > feels like a change that might be the right thing to do in general. Using > > subtractive rather than positive decode would give up a little performance, but I > > doubt it's important > > Is there a patch for that that people could try? Yes. https://bugzilla.kernel.org/show_bug.cgi?id=23332#c22 It works for me, but it's such a new idea to me that I'm not quite used to it and don't know how confident to be yet. Bjorn -- 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/