From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755695Ab1ALXQJ (ORCPT ); Wed, 12 Jan 2011 18:16:09 -0500 Received: from e6.ny.us.ibm.com ([32.97.182.146]:49446 "EHLO e6.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751484Ab1ALXQH (ORCPT ); Wed, 12 Jan 2011 18:16:07 -0500 Date: Wed, 12 Jan 2011 15:16:02 -0800 From: "Paul E. McKenney" To: Peter Zijlstra Cc: bharata@linux.vnet.ibm.com, Yong Zhang , linux-kernel@vger.kernel.org, Mike Galbraith , Ingo Molnar Subject: Re: [PATCH -tip 1/2] [PATCH -tip 1/2] sched: Reinstate group names in /proc/sched_debug. Message-ID: <20110112231602.GH17328@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20110111101040.GD4772@in.ibm.com> <20110111101153.GE4772@in.ibm.com> <20110111124658.GA4507@zhy> <20110111134244.GJ4772@in.ibm.com> <20110111140005.GA6069@zhy> <20110112074930.GF2723@in.ibm.com> <1294831112.19601.8.camel@laptop> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1294831112.19601.8.camel@laptop> 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 Wed, Jan 12, 2011 at 12:18:32PM +0100, Peter Zijlstra wrote: > On Wed, 2011-01-12 at 13:19 +0530, Bharata B Rao wrote: > > > > We could, but I guess its not a recommended practice anymore to depend on > > spinlocks to protect rcu readside. > > Not only is it not recommended, its a flat out bug for PREEMPT_RCU. And lockdep-RCU will yell at you under PREEMPT_RCU, which will result in Miles Lane yelling at me. ;-) Thanx, Paul