Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752403AbXJAULU (ORCPT ); Mon, 1 Oct 2007 16:11:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752393AbXJAULJ (ORCPT ); Mon, 1 Oct 2007 16:11:09 -0400 Received: from mx1.redhat.com ([66.187.233.31]:48319 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752192AbXJAULG (ORCPT ); Mon, 1 Oct 2007 16:11:06 -0400 Date: Mon, 1 Oct 2007 16:10:46 -0400 From: Dave Jones To: Arjan van de Ven Cc: Thomas Gleixner , Andi Kleen , David Bahi , linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org, Gregory Haskins Subject: Re: nmi_watchdog fix for x86_64 to be more like i386 Message-ID: <20071001201046.GA7089@redhat.com> Mail-Followup-To: Dave Jones , Arjan van de Ven , Thomas Gleixner , Andi Kleen , David Bahi , linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org, Gregory Haskins References: <46FA4A800200006C000192FE@sinclair.provo.novell.com> <200710011936.01528.ak@suse.de> <200710012116.59356.ak@suse.de> <20071001125626.32eb6d0b@laptopd505.fenrus.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20071001125626.32eb6d0b@laptopd505.fenrus.org> User-Agent: Mutt/1.5.14 (2007-02-12) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 968 Lines: 26 On Mon, Oct 01, 2007 at 12:56:26PM -0700, Arjan van de Ven wrote: > On Mon, 1 Oct 2007 21:27:39 +0200 (CEST) > > > > I already did this here by checking for cpu != 0. But it also needs > > > either tracking or forbidding migrations of irq 0. I can take care > > > of the patch. > > > > I was thinking about the same fix. On i386 we already have the irq > > migration / balancing of irq 0 disabled. That's why we setup IRQ0 with > > IRQ_NOBALANCING. > > btw doing this is a problem if the user decides to hot(un)plug cpu 0... > he then can't move the irqs away to do that You can't hot unplug cpu0. Take a look in sysfs, no /sys/devices/system/cpu/cpu0/online file. Dave -- http://www.codemonkey.org.uk - 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/