From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754749Ab0JNGJi (ORCPT ); Thu, 14 Oct 2010 02:09:38 -0400 Received: from rcsinet10.oracle.com ([148.87.113.121]:64190 "EHLO rcsinet10.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754680Ab0JNGJh (ORCPT ); Thu, 14 Oct 2010 02:09:37 -0400 Message-ID: <4CB69E22.2010005@kernel.org> Date: Wed, 13 Oct 2010 23:07:30 -0700 From: Yinghai Lu User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.12) Gecko/20100914 SUSE/3.0.8 Thunderbird/3.0.8 MIME-Version: 1.0 To: Ingo Molnar CC: mingo@redhat.com, hpa@zytor.com, jeremy@goop.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, hpa@linux.intel.com, jeremy.fitzhardinge@citrix.com, linux-tip-commits@vger.kernel.org Subject: Re: [tip:core/memblock] x86-64: Only set max_pfn_mapped to 512 MiB if we enter via head_64.S References: <4CB641F7.9040103@goop.org> <20101014055714.GA3329@elte.hu> In-Reply-To: <20101014055714.GA3329@elte.hu> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/13/2010 10:57 PM, Ingo Molnar wrote: > > * tip-bot for Jeremy Fitzhardinge wrote: > >> Commit-ID: 859ee4f57fb4e91de8439496f62eb996f4a28ca8 >> Gitweb: http://git.kernel.org/tip/859ee4f57fb4e91de8439496f62eb996f4a28ca8 >> Author: Jeremy Fitzhardinge >> AuthorDate: Wed, 13 Oct 2010 16:34:15 -0700 >> Committer: H. Peter Anvin >> CommitDate: Wed, 13 Oct 2010 17:09:59 -0700 >> >> x86-64: Only set max_pfn_mapped to 512 MiB if we enter via head_64.S >> >> head_64.S maps up to 512 MiB, but that is not necessarity true for >> other entry paths, such as Xen. > > These two commits are a boot crasher on x86 defconfig (64-bit): > > [ 0.000000] init_memory_mapping: 0000000000000000-000000003fff0000 > [ 0.000000] 0000000000 - 003fe00000 page 2M > [ 0.000000] 003fe00000 - 003fff0000 page 4k > [ 0.000000] Kernel panic - not syncing: Cannot find space for the kernel page tables > [ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.36-rc7-tip+ #49192 > [ 0.000000] Call Trace: > [ 0.000000] [] panic+0x8c/0x192 > [ 0.000000] [] ? printk+0x3c/0x3e > [ 0.000000] [] init_memory_mapping+0x372/0x506 > [ 0.000000] [] ? memblock_x86_reserve_range+0x7c/0x83 > [ 0.000000] [] setup_arch+0x5a3/0xa68 > [ 0.000000] [] ? printk+0x3c/0x3e > [ 0.000000] [] ? clockevents_register_notifier+0x3e/0x4a > [ 0.000000] [] start_kernel+0x83/0x36e > [ 0.000000] [] x86_64_start_reservations+0xb8/0xbc > [ 0.000000] [] x86_64_start_kernel+0xe7/0xee max_pfn_mapped is in .bss section. so it get cleared. will have a patch to move clear_bss from head64.c to head_64.S Thanks Yinghai