From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933785Ab1AMUls (ORCPT ); Thu, 13 Jan 2011 15:41:48 -0500 Received: from e2.ny.us.ibm.com ([32.97.182.142]:51119 "EHLO e2.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756942Ab1AMUll (ORCPT ); Thu, 13 Jan 2011 15:41:41 -0500 Date: Thu, 13 Jan 2011 12:41:35 -0800 From: "Paul E. McKenney" To: Russell King Cc: Linux Kernel List Subject: Re: INFO: task rcu_kthread:6 blocked for more than 120 seconds. Message-ID: <20110113204135.GK2500@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20110112174300.GA6504@flint.arm.linux.org.uk> <20110112222219.GA17328@linux.vnet.ibm.com> <20110113200526.GA31380@flint.arm.linux.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20110113200526.GA31380@flint.arm.linux.org.uk> User-Agent: Mutt/1.5.20 (2009-06-14) X-Content-Scanned: Fidelis XPS MAILER Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jan 13, 2011 at 08:05:26PM +0000, Russell King wrote: > On Wed, Jan 12, 2011 at 02:22:19PM -0800, Paul E. McKenney wrote: > > Does the following patch help? > > Yes it does, thanks. > > Tested-by: Russell King > > > commit 70ce43253a4465211a9c51e33d56a417c759a718 > > Author: Paul E. McKenney > > Date: Wed Jan 12 14:18:11 2011 -0800 > > > > rcu: avoid pointless blocked-task warnings > > > > If the RCU callback-processing kthread has nothing to do, it parks in > > a wait_event(). If RCU remains idle for more than two minutes, the > > kernel complains about this. This commit changes from wait_event() > > to wait_event_interruptible() to prevent the kernel from complaining > > just because RCU is idle. > > > > Reported-by: Russell King > > Please add '+kernel' in there, thanks. Done! FWIW, I copied the original from my email agent. Thanx, Paul