Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756195AbYGIUse (ORCPT ); Wed, 9 Jul 2008 16:48:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753103AbYGIUs1 (ORCPT ); Wed, 9 Jul 2008 16:48:27 -0400 Received: from gw.goop.org ([64.81.55.164]:41996 "EHLO mail.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752466AbYGIUs0 (ORCPT ); Wed, 9 Jul 2008 16:48:26 -0400 Message-ID: <48752409.1030201@goop.org> Date: Wed, 09 Jul 2008 13:48:09 -0700 From: Jeremy Fitzhardinge User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: "H. Peter Anvin" CC: Christoph Lameter , Ingo Molnar , "Eric W. Biederman" , Mike Travis , Andrew Morton , Jack Steiner , linux-kernel@vger.kernel.org, Arjan van de Ven 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> <48751CF9.4020901@linux-foundation.org> <4875209D.8010603@goop.org> <487522A8.60906@zytor.com> In-Reply-To: <487522A8.60906@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: 669 Lines: 17 H. Peter Anvin wrote: > Thinking about this some more, I don't know if it would make sense to > put the x86-64 stack canary at the *end* of the percpu area, and > otherwise use negative offsets. That would make sure they were > readily reachable from %rip-based references from within the kernel > text area. If we can move the canary then a whole pile of options open up. But the problem is that we can't. 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/