Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756485AbYGIUvJ (ORCPT ); Wed, 9 Jul 2008 16:51:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753344AbYGIUu4 (ORCPT ); Wed, 9 Jul 2008 16:50:56 -0400 Received: from gw.goop.org ([64.81.55.164]:35537 "EHLO mail.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753029AbYGIUu4 (ORCPT ); Wed, 9 Jul 2008 16:50:56 -0400 Message-ID: <487524A0.6020304@goop.org> Date: Wed, 09 Jul 2008 13:50:40 -0700 From: Jeremy Fitzhardinge User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: "H. Peter Anvin" CC: Arjan van de Ven , Ingo Molnar , "Eric W. Biederman" , Mike Travis , Andrew Morton , Christoph Lameter , Jack Steiner , linux-kernel@vger.kernel.org Subject: Re: [RFC 00/15] x86_64: Optimize percpu accesses References: <20080709165129.292635000@polaris-admin.engr.sgi.com> <20080709200757.GD14009@elte.hu> <48751B57.8030605@goop.org> <20080709133958.612635f0@infradead.org> <4875231F.1020506@zytor.com> In-Reply-To: <4875231F.1020506@zytor.com> X-Enigmail-Version: 0.95.6 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 741 Lines: 18 H. Peter Anvin wrote: > 1. it means pda references are invalid if their offsets are ever more > than CONFIG_PHYSICAL_BASE (which I do not think is likely, but still...) Why? As an aside, could we solve the problems by making CONFIG_PHYSICAL_BASE 0 - putting the percpu variables as the first thing in the kernel - and relocating on load? That would avoid having to make a special PT_LOAD segment at 0. Hm, would that result in the pda and the boot params getting mushed together? J -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/