From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964964Ab2KVS6p (ORCPT ); Thu, 22 Nov 2012 13:58:45 -0500 Received: from terminus.zytor.com ([198.137.202.10]:37038 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964910Ab2KVS6k (ORCPT ); Thu, 22 Nov 2012 13:58:40 -0500 Date: Wed, 21 Nov 2012 18:06:47 -0800 From: tip-bot for Stefano Stabellini Message-ID: Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@kernel.org, yinghai@kernel.org, tglx@linutronix.de, hpa@linux.intel.com, stefano.stabellini@eu.citrix.com Reply-To: mingo@kernel.org, hpa@zytor.com, linux-kernel@vger.kernel.org, yinghai@kernel.org, tglx@linutronix.de, hpa@linux.intel.com, stefano.stabellini@eu.citrix.com In-Reply-To: <1353123563-3103-29-git-send-email-yinghai@kernel.org> References: <1353123563-3103-29-git-send-email-yinghai@kernel.org> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/mm2] x86, mm: Add pointer about Xen mmu requirement for alloc_low_pages Git-Commit-ID: ddd3509df8f8d4f1cf4784f559d702ce00dc8846 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.7 (terminus.zytor.com [127.0.0.1]); Wed, 21 Nov 2012 18:06:53 -0800 (PST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: ddd3509df8f8d4f1cf4784f559d702ce00dc8846 Gitweb: http://git.kernel.org/tip/ddd3509df8f8d4f1cf4784f559d702ce00dc8846 Author: Stefano Stabellini AuthorDate: Fri, 16 Nov 2012 19:39:05 -0800 Committer: H. Peter Anvin CommitDate: Sat, 17 Nov 2012 11:59:28 -0800 x86, mm: Add pointer about Xen mmu requirement for alloc_low_pages Add link for more information 279b706 x86,xen: introduce x86_init.mapping.pagetable_reserve -v2: updated to commets from hpa to include commit name. Signed-off-by: Yinghai Lu Link: http://lkml.kernel.org/r/1353123563-3103-29-git-send-email-yinghai@kernel.org Signed-off-by: H. Peter Anvin --- arch/x86/mm/init.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index 02cea14..cb4f8ba 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -25,6 +25,15 @@ unsigned long __meminitdata pgt_buf_top; static unsigned long min_pfn_mapped; +/* + * Pages returned are already directly mapped. + * + * Changing that is likely to break Xen, see commit: + * + * 279b706 x86,xen: introduce x86_init.mapping.pagetable_reserve + * + * for detailed information. + */ __ref void *alloc_low_pages(unsigned int num) { unsigned long pfn;