From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932717AbYFGAKg (ORCPT ); Fri, 6 Jun 2008 20:10:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758500AbYFGAKY (ORCPT ); Fri, 6 Jun 2008 20:10:24 -0400 Received: from terminus.zytor.com ([198.137.202.10]:41366 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758413AbYFGAKW (ORCPT ); Fri, 6 Jun 2008 20:10:22 -0400 Message-ID: <4849D059.1000701@zytor.com> Date: Fri, 06 Jun 2008 17:03:37 -0700 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: Corey Minyard CC: paulmck@linux.vnet.ibm.com, linux-kernel@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, dvhltc@us.ibm.com, niv@us.ibm.com Subject: Re: Recoverable MCA interrupts from NMI handlers? IPMI and RCU? References: <20080606152134.GA13641@linux.vnet.ibm.com> <4849A3AC.5090107@acm.org> In-Reply-To: <4849A3AC.5090107@acm.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Corey Minyard wrote: > If you mean the IPMI driver, it does not tie into any SMI. It > theoretically could since there's a bit for that in the watchdog timer, > but there's been no demand and I haven't looked at it. I guess it would > be better than an NMI. > > If it did tie in, it would most likely just panic to get useful > information out before the watchdog reset the system. The main reason I could see wanting to use SMI would be as a debugging tool, since SMI makes the entire state of the system available at a low level; however, trying to interact with the state of the kernel at this priority level seems beyond the pale in terms of complexity. -hpa