From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753649Ab0JNGhW (ORCPT ); Thu, 14 Oct 2010 02:37:22 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:49366 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752933Ab0JNGhV (ORCPT ); Thu, 14 Oct 2010 02:37:21 -0400 Date: Thu, 14 Oct 2010 08:37:06 +0200 From: Ingo Molnar To: Yinghai Lu 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 Message-ID: <20101014063706.GA23561@elte.hu> References: <4CB641F7.9040103@goop.org> <20101014055714.GA3329@elte.hu> <4CB69E22.2010005@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4CB69E22.2010005@kernel.org> User-Agent: Mutt/1.5.20 (2009-08-17) X-ELTE-SpamScore: 0.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=0.0 required=5.9 tests=none autolearn=no SpamAssassin version=3.2.5 _SUMMARY_ Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Yinghai Lu wrote: > 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 Ok, great - thanks! Ingo