From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755917AbYGBOES (ORCPT ); Wed, 2 Jul 2008 10:04:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752687AbYGBOEI (ORCPT ); Wed, 2 Jul 2008 10:04:08 -0400 Received: from relay1.sgi.com ([192.48.171.29]:47796 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752671AbYGBOEH (ORCPT ); Wed, 2 Jul 2008 10:04:07 -0400 Message-ID: <486B8AD3.70007@sgi.com> Date: Wed, 02 Jul 2008 07:04:03 -0700 From: Mike Travis User-Agent: Thunderbird 2.0.0.6 (X11/20070801) MIME-Version: 1.0 To: Ingo Molnar CC: Jeremy Fitzhardinge , "Eric W. Biederman" , Christoph Lameter , "H. Peter Anvin" , Andrew Morton , linux-kernel@vger.kernel.org Subject: Re: [RFC 0/5] percpu: Optimize percpu accesses References: <20080701121634.865966000@polaris-admin.engr.sgi.com> <20080701145417.GB18522@elte.hu> <20080701150313.GA30476@elte.hu> <486A483B.2090804@sgi.com> In-Reply-To: <486A483B.2090804@sgi.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Mike Travis wrote: > Ingo Molnar wrote: >> * Ingo Molnar wrote: >> >>>> This patchset provides the following: >>>> >>>> * Cleanup: Fix early references to cpumask_of_cpu(0) >>>> * Generic: Percpu infrastructure to rebase the per cpu area to zero >>>> * x86_64: Fold pda into per cpu area >>>> * x86_64: Rebase per cpu variables to zero >>> thanks Mike - i've started testing it in -tip. One small merge fallout >>> fix is below. (it's for the new generic-ipi topic that was not in >>> tip/master yet when you merged percpu-zerobased to it) >> ok, -tip testing found an early boot crash caused by your patchset, on >> 64-bit x86: Hi Ingo, Which gcc version are you using? Thanks, Mike >> >> [ 0.396000] calling net_ns_init+0x0/0x143 >> [ 0.400000] net_namespace: 944 bytes >> [ 0.403578] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 >> [ 0.404000] IP: [] net_ns_init+0x9f/0x143 >> [ 0.404000] PGD 0 >> [ 0.404000] Oops: 0000 [1] SMP >> [ 0.404000] CPU 0 >> [...] >> >> full bootlog and config can be found at: >> >> http://redhat.com/~mingo/misc/crashlog-Tue_Jul__1_16_48_45_CEST_2008.bad >> http://redhat.com/~mingo/misc/config-Tue_Jul__1_16_48_45_CEST_2008.bad >> >> (another 64-bit testbox crashed as well, so this should be readily >> reproducible.) >> >> i've pushed this tree out to tip/tmp.core/percpu-zerobased.Jul__1_16_48 >> topic branch, that is the 2.6.26-rc8-tip-00250-g90874b0 kernel you can >> see in the crashlog. >> >> Ingo > > Wow, that was quick! > > At least this one gets to someplace debuggable. Some others that don't > even get to the first "kernel alive" messages are really annoying. ;-) > > Thanks, > Mike