Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753997AbYAPU0P (ORCPT ); Wed, 16 Jan 2008 15:26:15 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751673AbYAPU0A (ORCPT ); Wed, 16 Jan 2008 15:26:00 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:48518 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750968AbYAPUZ7 (ORCPT ); Wed, 16 Jan 2008 15:25:59 -0500 Date: Wed, 16 Jan 2008 21:24:44 +0100 From: Ingo Molnar To: Andreas Herrmann Cc: venkatesh.pallipadi@intel.com, ak@muc.de, ebiederm@xmission.com, rdreier@cisco.com, torvalds@linux-foundation.org, gregkh@suse.de, airlied@skynet.ie, davej@redhat.com, tglx@linutronix.de, hpa@zytor.com, akpm@linux-foundation.org, arjan@infradead.org, jesse.barnes@intel.com, davem@davemloft.net, linux-kernel@vger.kernel.org Subject: Re: [patch 0/4] x86: PAT followup - Incremental changes and bug fixes Message-ID: <20080116202444.GD4212@elte.hu> References: <20080116023955.597433000@intel.com> <20080116185748.GA11244@alberich.amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080116185748.GA11244@alberich.amd.com> User-Agent: Mutt/1.5.17 (2007-11-01) 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 Content-Length: 1234 Lines: 32 * Andreas Herrmann wrote: > I just want to report that the PAT support in x86/mm causes crashes on > two of my test machines. On both boxes the SATA detection does not > work when the PAT support is patched into the kernel. > > Symptoms are as follows -- best described by a diff between the two > boot.logs: > > # diff boot-failing.log boot-working.log > > -Linux version 2.6.24-rc8-ga9f7faa5 (root@hunter) (gcc version ... > +Linux version 2.6.24-rc8-g2ea3cf43 (root@hunter) (gcc version ... > ... > early_iounmap(ffffffff82a0b000, 00001000) > -early_ioremap(000000000000c000, 00001000) => -000002103394304 > -early_iounmap(ffffffff82a0c000, 00001000) hm, so the early_ioremap() stuff isnt working well enough ... that's the main effect of the PAT patches at the moment: no kernel code will access the low linear mappings (BIOS tables, ACPI data, etc.) directly, it's all done via early_ioremap(). But it's apparently buggy somewhere ... Ingo -- 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/