From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752150Ab2LVD0S (ORCPT ); Fri, 21 Dec 2012 22:26:18 -0500 Received: from terminus.zytor.com ([198.137.202.10]:41323 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751168Ab2LVD0Q (ORCPT ); Fri, 21 Dec 2012 22:26:16 -0500 Message-ID: <50D52841.9030301@zytor.com> Date: Fri, 21 Dec 2012 19:25:53 -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: "Eric W. Biederman" CC: Konrad Rzeszutek Wilk , Yinghai Lu , Thomas Gleixner , Ingo Molnar , Andrew Morton , linux-kernel@vger.kernel.org Subject: Re: [PATCH v7 24/27] x86: Add swiotlb force off support References: <1355814959-10573-1-git-send-email-yinghai@kernel.org> <1355814959-10573-25-git-send-email-yinghai@kernel.org> <20121222023741.GF3468@phenom.dumpdata.com> <87bodmhkns.fsf@xmission.com> <20121222031019.GA4120@phenom.dumpdata.com> <87pq22g488.fsf@xmission.com> In-Reply-To: <87pq22g488.fsf@xmission.com> X-Enigmail-Version: 1.4.6 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 12/21/2012 07:23 PM, Eric W. Biederman wrote: > > In this case YH has been working on the case of loading a kernel > completely above 4G, and apparently he has also been testing the case of > running a kernel with no memory below 4G. > It is worth noting that we cannot run with *no* memory below 4G -- it is not possible to run SMP at least without some memory below the 1M mark. -hpa