From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753033Ab3FFVd2 (ORCPT ); Thu, 6 Jun 2013 17:33:28 -0400 Received: from mail.candelatech.com ([208.74.158.172]:55476 "EHLO ns3.lanforge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751115Ab3FFVd1 (ORCPT ); Thu, 6 Jun 2013 17:33:27 -0400 Message-ID: <51B10023.3050400@candelatech.com> Date: Thu, 06 Jun 2013 14:33:23 -0700 From: Ben Greear Organization: Candela Technologies User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130311 Thunderbird/17.0.4 MIME-Version: 1.0 To: Tejun Heo CC: linux-kernel@vger.kernel.org, eric.dumazet@gmail.com Subject: Re: [PATCH v2] Fix lockup related to stop_machine being stuck in __do_softirq. References: <1370535006-3467-1-git-send-email-greearb@candelatech.com> <20130606204821.GB5045@htj.dyndns.org> In-Reply-To: <20130606204821.GB5045@htj.dyndns.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 On 06/06/2013 01:48 PM, Tejun Heo wrote: > As wrote before, a brief explanation on why both are necessary would > be nice. Something like - "the time limit prevents from introducing > excessive latency from softirq handling and the loop limit protects > against softirq runaway which may happen during stop_machine - see > XXX". > > Please cc Linus and also cc stable@vger.kernel.org. We definitely > want this backported. v3 was sent, with updated comments and expanded CC list. The patch is against 3.9.4, though I assume it will apply to the upstream kernel easily enough. I didn't want to add a link to the email thread.. The commit message and patch has enough info that I think an interested party could find the email thread easily enough if they needed more history. And, much of the email thread is me running in circles thinking I am going insane :) Thanks, Ben -- Ben Greear Candela Technologies Inc http://www.candelatech.com