Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756560AbXJAUMV (ORCPT ); Mon, 1 Oct 2007 16:12:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752813AbXJAUMN (ORCPT ); Mon, 1 Oct 2007 16:12:13 -0400 Received: from e36.co.us.ibm.com ([32.97.110.154]:58122 "EHLO e36.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751790AbXJAUMM (ORCPT ); Mon, 1 Oct 2007 16:12:12 -0400 Date: Mon, 1 Oct 2007 13:11:47 -0700 From: "Paul E. McKenney" 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: <20071001201147.GF29100@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com 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/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 910 Lines: 22 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 Last I tried it, x86_64 and i386 in fact prohibit hotunplugging CPU 0. Thanx, Paul - 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/