From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764151AbXKTVB4 (ORCPT ); Tue, 20 Nov 2007 16:01:56 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757820AbXKTVBs (ORCPT ); Tue, 20 Nov 2007 16:01:48 -0500 Received: from terminus.zytor.com ([198.137.202.10]:51602 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756749AbXKTVBs (ORCPT ); Tue, 20 Nov 2007 16:01:48 -0500 Message-ID: <47434B28.4040104@zytor.com> Date: Tue, 20 Nov 2007 13:01:28 -0800 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.9 (X11/20071115) MIME-Version: 1.0 To: Andi Kleen CC: Christoph Lameter , akpm@linux-foundation.org, travis@sgi.com, Mathieu Desnoyers , linux-kernel@vger.kernel.org Subject: Re: [rfc 08/45] cpu alloc: x86 support References: <20071120011132.143632442@sgi.com> <200711201301.25373.ak@suse.de> <474346DE.5050305@zytor.com> <200711202151.58310.ak@suse.de> In-Reply-To: <200711202151.58310.ak@suse.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Andi Kleen wrote: >> This limitation shouldn't apply to the percpu area, since gs_base can be >> pointed anywhere in the address space -- in effect we're always indirect. > > The initial reference copy of the percpu area has to be addressed by > the linker. > > Hmm, in theory since it is not actually used by itself I suppose you could > move it into positive space. > Positive space for absolute references, or just below -2 GB for %rip references; either should work. -hpa