From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757233AbYFPSFV (ORCPT ); Mon, 16 Jun 2008 14:05:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753345AbYFPSFI (ORCPT ); Mon, 16 Jun 2008 14:05:08 -0400 Received: from relay1.sgi.com ([192.48.171.29]:59911 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751677AbYFPSFG (ORCPT ); Mon, 16 Jun 2008 14:05:06 -0400 Date: Mon, 16 Jun 2008 13:05:03 -0500 From: Paul Jackson To: "H. Peter Anvin" Cc: ying.huang@intel.com, mingo@elte.hu, tglx@linutronix.de, yhlu.kernel@gmail.com, steiner@sgi.com, travis@sgi.com, linux-kernel@vger.kernel.org, andi@firstfloor.org, akpm@linux-foundation.org Subject: Re: [PATCH 4/8] x86 boot: allow overlapping ebda and efi memmap memory ranges Message-Id: <20080616130503.1a3a72dc.pj@sgi.com> In-Reply-To: <4856A6F9.3090605@zytor.com> References: <20080616062945.14597.78009.sendpatchset@polaris-admin.engr.sgi.com> <20080616063001.14597.96170.sendpatchset@polaris-admin.engr.sgi.com> <1213600062.11185.13.camel@caritas-dev.intel.com> <20080616032457.718f4d87.pj@sgi.com> <1213606435.12968.14.camel@caritas-dev.intel.com> <48568B56.7060307@zytor.com> <20080616113806.2ff4c1a4.pj@sgi.com> <48569D62.9050107@zytor.com> <20080616123721.bb9195e6.pj@sgi.com> <4856A6F9.3090605@zytor.com> Organization: SGI X-Mailer: Sylpheed version 2.2.4 (GTK+ 2.12.0; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org hpa wrote: > We *are* going to have similar hacks. That's not a question. I agree ;) That's not the question. I have no religious objection to hacks. I just try to keep their population in check. In some cases (PC BIOS and EFI come to mind ;) I am less successful than in other cases. > *Not* perpetuating may ... cause odd behaviours that only are > noticeable when you, say, boot from one OS into another. So I take it you are saying that the future permutations and, in this case with nested boots, combinations are sufficiently diverse and unpredictable that as a practical matter we should perpeturate this (gentle) hack. I'm fine with that. Huang - would you agree to this safety reservation of the ebda area even on EFI enabled systems? -- I won't rest till it's the best ... Programmer, Linux Scalability Paul Jackson 1.940.382.4214