From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S268791AbUH3SIz (ORCPT ); Mon, 30 Aug 2004 14:08:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S268758AbUH3SFO (ORCPT ); Mon, 30 Aug 2004 14:05:14 -0400 Received: from e33.co.us.ibm.com ([32.97.110.131]:12691 "EHLO e33.co.us.ibm.com") by vger.kernel.org with ESMTP id S268707AbUH3SDn (ORCPT ); Mon, 30 Aug 2004 14:03:43 -0400 Subject: Re: [RFC][PATCH] fix target_cpus() for summit subarch From: john stultz To: "Martin J. Bligh" Cc: lkml , William Lee Irwin III , James , keith maanthey , Chris McDermott In-Reply-To: <79750000.1093673866@[10.10.2.4]> References: <1093652688.14662.16.camel@cog.beaverton.ibm.com> <79750000.1093673866@[10.10.2.4]> Content-Type: text/plain Message-Id: <1093888987.14662.69.camel@cog.beaverton.ibm.com> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.5 (1.4.5-7) Date: Mon, 30 Aug 2004 11:03:07 -0700 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2004-08-27 at 23:17, Martin J. Bligh wrote: > --john stultz wrote (on Friday, August 27, 2004 17:24:48 -0700): > > > I've been hunting down a bug affecting IBM x440/x445 systems where the > > floppy driver would get spurious interrupts and would not initialize > > properly. > > > > After digging James Cleverdon pointed out that target_cpus() is routing > > the interrupts to the clustered apic broadcast mask. This was causing > > multiple interrupts to show up, breaking the floppy init code. > > > > This one-liner fix simply routes interrupts to the first cpu to resolve > > this issue. > > I'd say that means your hardware is horribly broken ... but I guess this > might be a suitable workaround given we're going to reprogram them all > later. Ok, then my patch probably isn't correct. Let me grab James and we'll sit down and work this out later today. thanks -john