From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758988AbXIYQKw (ORCPT ); Tue, 25 Sep 2007 12:10:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754338AbXIYQKo (ORCPT ); Tue, 25 Sep 2007 12:10:44 -0400 Received: from e4.ny.us.ibm.com ([32.97.182.144]:42838 "EHLO e4.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753272AbXIYQKn (ORCPT ); Tue, 25 Sep 2007 12:10:43 -0400 Subject: Re: [PATCH 24/25] r/o bind mounts: track number of mount writers From: Dave Hansen To: Andrew Morton Cc: linux-kernel@vger.kernel.org, hch@infradead.org In-Reply-To: <20070924161555.aad68a72.akpm@linux-foundation.org> References: <20070920195249.852667D5@kernel> <20070920195320.38C8E20D@kernel> <20070923231713.f81ee0db.akpm@linux-foundation.org> <1190671602.26982.261.camel@localhost> <20070924152532.305ec951.akpm@linux-foundation.org> <1190675137.26982.266.camel@localhost> <20070924161555.aad68a72.akpm@linux-foundation.org> Content-Type: text/plain Date: Tue, 25 Sep 2007 09:10:39 -0700 Message-Id: <1190736639.26982.279.camel@localhost> Mime-Version: 1.0 X-Mailer: Evolution 2.10.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2007-09-24 at 16:15 -0700, Andrew Morton wrote: > On Mon, 24 Sep 2007 16:05:37 -0700 > Dave Hansen wrote: > > > On Mon, 2007-09-24 at 15:25 -0700, Andrew Morton wrote: > > > hm. I saw that warning on my 2-way. It has CONFIG_NR_CPUS=8 so perhaps > > > the kernel has decided that this machine can possibly have eight CPUs. > > > > > > It's an old super-micro board, doesn't have ACPI. > > > > Well, it's looking like we only set cpu_possible_map from data we find > > in the MP table, which makes sense. The only question is how your > > system gets more than ~8 possible cpus. Do you have the .config handy? > > http://userweb.kernel.org/~akpm/config-vmm.txt I've reproduced this. I'll do more runtime testing with all of the debugging, CONFIG_CPU_HOTPLUG=y, and NR_CPUS to a high value. It should help catch things like this in the future. -- Dave