Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758582AbXJ2RvY (ORCPT ); Mon, 29 Oct 2007 13:51:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755548AbXJ2RvR (ORCPT ); Mon, 29 Oct 2007 13:51:17 -0400 Received: from mx1.redhat.com ([66.187.233.31]:40298 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753559AbXJ2RvQ (ORCPT ); Mon, 29 Oct 2007 13:51:16 -0400 Date: Mon, 29 Oct 2007 13:50:14 -0400 From: Dave Jones To: Linux Kernel Cc: Martin Ebourne , Zou Nan hai , Suresh Siddha , Andi Kleen , stable@kernel.org, Andrew Morton , Linus Torvalds Subject: 2.6.23 boot failures on x86-64. Message-ID: <20071029175014.GH7793@redhat.com> Mail-Followup-To: Dave Jones , Linux Kernel , Martin Ebourne , Zou Nan hai , Suresh Siddha , Andi Kleen , stable@kernel.org, Andrew Morton , Linus Torvalds MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.14 (2007-02-12) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1586 Lines: 45 We've had a number of people reporting that their x86-64s stopped booting when they moved to 2.6.23. It rebooted just after discovering the AGP bridge as a result of the IOMMU init. Martin tracked this down to the following commit. commit 2e1c49db4c640b35df13889b86b9d62215ade4b6 Author: Zou Nan hai Date: Fri Jun 1 00:46:28 2007 -0700 x86_64: allocate sparsemem memmap above 4G On systems with huge amount of physical memory, VFS cache and memory memmap may eat all available system memory under 4G, then the system may fail to allocate swiotlb bounce buffer. There was a fix for this issue in arch/x86_64/mm/numa.c, but that fix dose not cover sparsemem model. This patch add fix to sparsemem model by first try to allocate memmap above 4G. Signed-off-by: Zou Nan hai Acked-by: Suresh Siddha Cc: Andi Kleen Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds This should be probably be reverted for 2.6.23-stable, and either fixed properly in .24, or reverted there too. More info at https://bugzilla.redhat.com/show_bug.cgi?id=249174 Dave -- http://www.codemonkey.org.uk - 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/