Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752804AbZJUGwW (ORCPT ); Wed, 21 Oct 2009 02:52:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752553AbZJUGwV (ORCPT ); Wed, 21 Oct 2009 02:52:21 -0400 Received: from smtp2.ultrahosting.com ([74.213.174.253]:53155 "EHLO smtp.ultrahosting.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752229AbZJUGwU (ORCPT ); Wed, 21 Oct 2009 02:52:20 -0400 Date: Wed, 21 Oct 2009 02:43:31 -0400 (EDT) From: Christoph Lameter X-X-Sender: cl@gentwo.org To: Tejun Heo cc: Ingo Molnar , Jeff Mahoney , Jiri Kosina , Peter Zijlstra , Linux Kernel Mailing List , Tony Luck , Fenghua Yu , linux-ia64@vger.kernel.org, Linus Torvalds , peterc@gelato.unsw.edu.au Subject: Re: Commit 34d76c41 causes linker errors on ia64 with NR_CPUS=4096 In-Reply-To: <4ADDC1FC.8010903@kernel.org> Message-ID: References: <4ADB967A.4080707@suse.com> <20091020061557.GE8550@elte.hu> <20091020063555.GJ8550@elte.hu> <4ADDB640.4020707@suse.com> <20091020134308.GA3930@elte.hu> <4ADDC1C6.9090305@kernel.org> <4ADDC1FC.8010903@kernel.org> User-Agent: Alpine 1.10 (DEB 962 2008-03-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 756 Lines: 16 The suggestion to Tony was to stop using the fixed TLB address for the per cpu areas and instead use a global register like on x86 and sparc. Peter Chubb then said that we had available global registers (cced him) that could be used for this purpose. Doing so would make percpu support conform to the schemes used by other architectures. However, IA64 supports TLBs for larger pages (128MB, 256MB ...). So we could change the maximum size of the static percpu data by using a different sized TLB entry. Tony? -- 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/