From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932906Ab0FUQqV (ORCPT ); Mon, 21 Jun 2010 12:46:21 -0400 Received: from e3.ny.us.ibm.com ([32.97.182.143]:37142 "EHLO e3.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932633Ab0FUQqU (ORCPT ); Mon, 21 Jun 2010 12:46:20 -0400 Date: Mon, 21 Jun 2010 09:46:14 -0700 From: "Paul E. McKenney" To: Kyle McMartin Cc: Tilman Schmidt , linux-kernel@vger.kernel.org Subject: Re: CONFIG_PROVE_RCU breaks proprietary modules (rcu_lock_map) Message-ID: <20100621164614.GD2354@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <4BA689EA.4050102@imap.cc> <20100329150946.GB2569@linux.vnet.ibm.com> <4BB0E937.7070200@imap.cc> <20100329184059.GL2569@linux.vnet.ibm.com> <20100617103747.GZ20317@bombadil.infradead.org> <20100620151605.GA2396@linux.vnet.ibm.com> <20100621101425.GA20317@bombadil.infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100621101425.GA20317@bombadil.infradead.org> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jun 21, 2010 at 06:14:26AM -0400, Kyle McMartin wrote: > On Sun, Jun 20, 2010 at 08:16:05AM -0700, Paul E. McKenney wrote: > > My kneejerk reaction is that PROVE_RCU is a developer tool, so I am > > OK with it not being set by default in Rawhide. Or have you seen good > > value from (say) PROVE_LOCKING in Rawhide? > > Hi Paul, > > I'm fine with this, we try to enable debug options in rawhide in order > to get the most out of bug reports/dmesgs that we can. We've definitely > spotted a lot of lockdep reports by having it enabled for general > desktop use cases (but as debugging has become more intensive, the perf > loss from having it enabled is more costly.) > > I suspect we'll be OK with PROVE_RCU off though. Sounds good -- but please feel free to bug me about this again if it turns out that you are seeing too many testing escapes from Rawhide into RHEL. Until then, my thought is that PROVE_RCU testing should primarily be done by developers on development trees. Thanx, Paul