From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753115AbZBWGnN (ORCPT ); Mon, 23 Feb 2009 01:43:13 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751984AbZBWGm6 (ORCPT ); Mon, 23 Feb 2009 01:42:58 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:57006 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751528AbZBWGm5 (ORCPT ); Mon, 23 Feb 2009 01:42:57 -0500 Date: Mon, 23 Feb 2009 07:42:36 +0100 From: Ingo Molnar To: Yinghai Lu Cc: "Kevin O'Connor" , "Rafael J. Wysocki" , Stefan Reinauer , linux-kernel@vger.kernel.org, coreboot@coreboot.org, Jaswinder Singh Rajput Subject: Re: MPTable can not be high-memory on Linux Message-ID: <20090223064236.GA27203@elte.hu> References: <499DB40C.1060205@coresystems.de> <499DCE79.8020809@coresystems.de> <20090222152530.GA30576@morn.localdomain> <200902221806.55429.rjw@sisk.pl> <49A1C4AF.9000009@kernel.org> <20090222223226.GA3346@morn.localdomain> <20090222225847.GB1649@elte.hu> <49A23EE0.8000102@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <49A23EE0.8000102@kernel.org> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Yinghai Lu wrote: > Ingo Molnar wrote: > > * Kevin O'Connor wrote: > > > >> On Sun, Feb 22, 2009 at 01:33:35PM -0800, Yinghai Lu wrote: > >> [...] > >>>>>> BIOS-e820: 0000000000090000 - 0000000000100000 (reserved) > >>>>>> BIOS-e820: 0000000000100000 - 000000003f7f0000 (usable) > >>>>>> BIOS-e820: 000000003f7f0000 - 0000000040000000 (reserved) > >> [...] > >>>>>> found SMP MP-table at [c00f9fc0] 000f9fc0 > >> [...] > >>> that should work for a long time. > >>> > >>> 0xf9fc0 < 1M is quite < max_low_pfn, so wonder why bootmem could panic. > >> On this machine the mptable "floating" structure is at > >> 0xf9fc0. It points to the rest of the table which is in the > >> 0x3f7f0000 area. > >> > >> Note, that this is on a Coreboot+SeaBIOS machine - so we can > >> change the bios. However, the mptable spec does allow for > >> part of the table to be high memory. > > > > yes, and i'd prefer if it worked fine even if it's that high. > > > > please check > > [PATCH] x86: check physptr with max_low_pfn on 32bit Applied to tip:x86/apic, thanks Yinghai! This will show up in v2.6.30. I suspect Coreboot will be changed anyway (older Linux kernels may crash), but it's worth having this bug fixed nevertheless. Ingo