Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964784AbWLTKke (ORCPT ); Wed, 20 Dec 2006 05:40:34 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964969AbWLTKkd (ORCPT ); Wed, 20 Dec 2006 05:40:33 -0500 Received: from smtp.osdl.org ([65.172.181.25]:53183 "EHLO smtp.osdl.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964784AbWLTKkd (ORCPT ); Wed, 20 Dec 2006 05:40:33 -0500 Date: Wed, 20 Dec 2006 02:37:34 -0800 From: Andrew Morton To: Chuck Ebbert <76306.1226@compuserve.com> Cc: "Yinghai Lu" , "ard@telegraafnet.nl" , take@libero.it, agalanin@mera.ru, linux-kernel@vger.kernel.org, bugme-daemon@bugzilla.kernel.org, "Eric W. Biederman" , "Zhang Yanmin" Subject: Re: [Bug 7505] Linux-2.6.18 fails to boot on AMD64 machine Message-Id: <20061220023734.863825e1.akpm@osdl.org> In-Reply-To: <200612200502_MC3-1-D5AF-1674@compuserve.com> References: <200612200502_MC3-1-D5AF-1674@compuserve.com> X-Mailer: Sylpheed version 2.2.7 (GTK+ 2.8.17; x86_64-unknown-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1690 Lines: 56 On Wed, 20 Dec 2006 04:59:19 -0500 Chuck Ebbert <76306.1226@compuserve.com> wrote: > > On 12/19/06, Chuck Ebbert <76306.1226@compuserve.com> wrote: > > > So an external interrupt occurred, the system tried to use interrupt > > > descriptor #39 decimal (irq 7), but the descriptor was invalid. > > > > but the irq is disabled at that time. > > > > can you use attached diff to verify if the irq is enable somehow? > > But it seems interrupts are on--look at the flags: > > RSP: 0018:ffffffff803cdf68 EFLAGS: 00010246 > down_write()->__down_write()->__down_write_nested()->spin_unlock_irq()->dead Could someone please test this? --- a/lib/rwsem-spinlock.c~a +++ a/lib/rwsem-spinlock.c @@ -195,13 +195,14 @@ void fastcall __sched __down_write_neste { struct rwsem_waiter waiter; struct task_struct *tsk; + unsigned long flags; - spin_lock_irq(&sem->wait_lock); + spin_lock_irqsave(&sem->wait_lock, flags); if (sem->activity == 0 && list_empty(&sem->wait_list)) { /* granted */ sem->activity = -1; - spin_unlock_irq(&sem->wait_lock); + spin_unlock_irqrestore(&sem->wait_lock, flags); goto out; } @@ -216,7 +217,7 @@ void fastcall __sched __down_write_neste list_add_tail(&waiter.list, &sem->wait_list); /* we don't need to touch the semaphore struct anymore */ - spin_unlock_irq(&sem->wait_lock); + spin_unlock_irqrestore(&sem->wait_lock, flags); /* wait to be given the lock */ for (;;) { _ - 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/