From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755262AbYFGAoZ (ORCPT ); Fri, 6 Jun 2008 20:44:25 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752799AbYFGAoR (ORCPT ); Fri, 6 Jun 2008 20:44:17 -0400 Received: from E23SMTP04.au.ibm.com ([202.81.18.173]:45493 "EHLO e23smtp04.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752716AbYFGAoQ (ORCPT ); Fri, 6 Jun 2008 20:44:16 -0400 Date: Fri, 6 Jun 2008 17:44:11 -0700 From: "Paul E. McKenney" To: "H. Peter Anvin" Cc: Corey Minyard , 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? Message-ID: <20080607004411.GI25053@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20080606152134.GA13641@linux.vnet.ibm.com> <4849A3AC.5090107@acm.org> <4849D059.1000701@zytor.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4849D059.1000701@zytor.com> User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jun 06, 2008 at 05:03:37PM -0700, H. Peter Anvin wrote: > 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. Works for me! ;-) Thanx, Paul