Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754969Ab3ETHgS (ORCPT ); Mon, 20 May 2013 03:36:18 -0400 Received: from mail-pa0-f49.google.com ([209.85.220.49]:33343 "EHLO mail-pa0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754283Ab3ETHgR (ORCPT ); Mon, 20 May 2013 03:36:17 -0400 Date: Mon, 20 May 2013 16:36:12 +0900 From: Tejun Heo To: Borislav Petkov Cc: Michael Wang , "Paul E. McKenney" , Jiri Kosina , Frederic Weisbecker , Tony Luck , linux-kernel@vger.kernel.org, x86@kernel.org, Thomas Gleixner Subject: Re: NOHZ: WARNING: at arch/x86/kernel/smp.c:123 native_smp_send_reschedule, round 2 Message-ID: <20130520073612.GB24222@mtj.dyndns.org> References: <20130509125040.GF27333@pd.tnic> <20130509125859.GG27333@pd.tnic> <20130515184528.GO4442@linux.vnet.ibm.com> <20130515224358.GF11783@pd.tnic> <20130515235512.GT4442@linux.vnet.ibm.com> <20130517135641.GF23035@pd.tnic> <51999591.8030401@linux.vnet.ibm.com> <20130520045023.GA12690@pd.tnic> <5199C169.7060504@linux.vnet.ibm.com> <20130520064727.GD12690@pd.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130520064727.GD12690@pd.tnic> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 877 Lines: 28 Hello, On Mon, May 20, 2013 at 08:47:27AM +0200, Borislav Petkov wrote: > > So there are two questions here: > > 1. Is gov_queue_work() want to queue the work on offline cpu? > > 2. Is mod_delayed_work_on() allow offline cpu? > > > > I guess both should be false? > > Well, if we don't allow queueing work on a cpu which goes offline, i.e. > #2, the problem should be solved. > > Tejun? Workqueue proper would behave okish (no affinity of course but the work items are still executed) but mod_delayed_work_on() adds a timer on the target CPU and I think adding a timer on an offline cpu would be a problem. Thanks. -- tejun -- 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/