From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755132Ab2LNAyU (ORCPT ); Thu, 13 Dec 2012 19:54:20 -0500 Received: from terminus.zytor.com ([198.137.202.10]:41371 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753409Ab2LNAyS (ORCPT ); Thu, 13 Dec 2012 19:54:18 -0500 Message-ID: <50CA78AC.3060700@zytor.com> Date: Thu, 13 Dec 2012 16:54:04 -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 Gleixner , Ingo Molnar , "Eric W. Biederman" , Andrew Morton , linux-kernel@vger.kernel.org Subject: Re: [PATCH v6 19/27] x86, boot: update comments about entries for 64bit image References: <1355436141-8668-1-git-send-email-yinghai@kernel.org> <1355436141-8668-20-git-send-email-yinghai@kernel.org> <50CA6478.20008@zytor.com> <50CA7515.9080701@zytor.com> In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/13/2012 04:51 PM, Yinghai Lu wrote: > On Thu, Dec 13, 2012 at 4:44 PM, Yinghai Lu wrote: >> On Thu, Dec 13, 2012 at 4:38 PM, H. Peter Anvin wrote: >>> On 12/13/2012 04:13 PM, Yinghai Lu wrote: >>> >>> It is definitely the minmum we can rely on, and so is the minimum we should >>> rely on. In fact, we don't even need .bss/.brk to be mapped, but we >>> probably should require that as a matter of protocol. >> >> in my version of arch/x86/kernel/head_64.S is using BRK to do >> ident/kernel high mapping >> for kernel that is above 4G. >> so .brk is needed. > > also need to make sure zero page and command line get ident mapping. > because arch/x86/boot/compressed/head_64.S is using them. > ... or we need to do the same kind of thing there. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.