From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755732Ab3AKWSR (ORCPT ); Fri, 11 Jan 2013 17:18:17 -0500 Received: from terminus.zytor.com ([198.137.202.10]:53209 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755495Ab3AKWSP (ORCPT ); Fri, 11 Jan 2013 17:18:15 -0500 Message-ID: <50F08F43.7080604@zytor.com> Date: Fri, 11 Jan 2013 14:16:35 -0800 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/17.0 Thunderbird/17.0 MIME-Version: 1.0 To: Yinghai Lu CC: Thomas Renninger , MUNEDA Takahiro , Takao Indoh , linux-pci@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, andi@firstfloor.org, tokunaga.keiich@jp.fujitsu.com, kexec@lists.infradead.org, hbabu@us.ibm.com, mingo@redhat.com, ddutile@redhat.com, vgoyal@redhat.com, ishii.hironobu@jp.fujitsu.com, bhelgaas@google.com, tglx@linutronix.de, khalid@gonehiking.org, horms@verge.net.au Subject: Re: [PATCH] x86 e820: only void usable memory areas in memmap=exactmap case References: <20121127004144.3604.61708.sendpatchset@tindoh.g01.fujitsu.local> <201301111333.49238.trenn@suse.de> <1603289.LXteBtkifD@hammer82.arch.suse.de> <50F070D8.2080109@zytor.com> In-Reply-To: X-Enigmail-Version: 1.5 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 01/11/2013 01:09 PM, Yinghai Lu wrote: > On Fri, Jan 11, 2013 at 12:06 PM, H. Peter Anvin wrote: >> On 01/11/2013 11:59 AM, Yinghai Lu wrote: >>> On Fri, Jan 11, 2013 at 10:24 AM, Thomas Renninger wrote: >>>>> We may need to keep exactmap intact. >>>> Why? >>>> Kexec/kdump should have been the only user? >>>> If older/current kexec calls still add ACPI maps via memmap=X#Y, >>>> they should already exist in the original e820 map and fall off or >>>> get glued to one region if (wrongly) overlapping via sanitize_map. >>> >>> No, kexec/kdump is not the only user for memmap=exactmap. >>> >> >> Who is using it then, since you seem to know? > > http://forums.gentoo.org/viewtopic-t-487476-highlight-proliant.html > > http://forums.fedoraforum.org/archive/index.php/t-225347.html > Hm... both of those seem to be someone trying memmap=exactmap to hack around a problem which really was elsewhere, with a different solution. -hpa