From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763865AbYHDWqf (ORCPT ); Mon, 4 Aug 2008 18:46:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751885AbYHDWqB (ORCPT ); Mon, 4 Aug 2008 18:46:01 -0400 Received: from e6.ny.us.ibm.com ([32.97.182.146]:37730 "EHLO e6.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750767AbYHDWqA (ORCPT ); Mon, 4 Aug 2008 18:46:00 -0400 Date: Mon, 4 Aug 2008 15:45:33 -0700 From: Nishanth Aravamudan To: "Luck, Tony" Cc: "mingo@elte.hu" , "linux-ia64@vger.kernel.org" , LKML Subject: Re: [BISECTION RESULT] sched: revert cpu_clock to pre-27ec4407790d075c325e1f4da0a19c56953cce23 state Message-ID: <20080804224533.GC30096@us.ibm.com> References: <20080804194646.GA17390@us.ibm.com> <57C9024A16AD2D4C97DC78E552063EA308328FB4@orsmsx505.amr.corp.intel.com> <57C9024A16AD2D4C97DC78E552063EA308329110@orsmsx505.amr.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <57C9024A16AD2D4C97DC78E552063EA308329110@orsmsx505.amr.corp.intel.com> X-Operating-System: Linux 2.6.26-rc9-00132-g9df2fe9 (x86_64) User-Agent: Mutt/1.5.17+20080114 (2008-01-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04.08.2008 [15:00:47 -0700], Luck, Tony wrote: > > I'd bet resonable sums of money that we are (once again) accessing > > per-cpu variables in code before ia64 has a chance to initialize > > things so that they can actually work. :-( > > I tried this simple hack to check ... per-cpu variables are > not usable until cpu_init() sets up the "ar.k3" register on > ia64. So this hack checks to see if it is set before calling > cpu_clock(): Would you like me to test this patch on the box, to verify? It seems like you were able to reproduce the non-booting kernel? Thanks, Nish -- Nishanth Aravamudan IBM Linux Technology Center