Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753994Ab2HYCK0 (ORCPT ); Fri, 24 Aug 2012 22:10:26 -0400 Received: from nctlincom02.orcon.net.nz ([60.234.4.75]:57135 "EHLO nctlincom02.orcon.net.nz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751005Ab2HYCKV (ORCPT ); Fri, 24 Aug 2012 22:10:21 -0400 Message-ID: <50383409.7090207@orcon.net.nz> Date: Sat, 25 Aug 2012 14:10:17 +1200 From: Michael Cree User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.16) Gecko/20120724 Icedove/3.0.11 MIME-Version: 1.0 To: Ben Hutchings CC: paulmck@linux.vnet.ibm.com, Frederic Weisbecker , LKML , Chris Zankel , "3.2.x.." , Chen Liqin , Lennox Wu , "James E.J. Bottomley" , Helge Deller , Parisc , David Howells , Koichi Yasutake , Geert Uytterhoeven , m68k , Hirokazu Takata , Yoshinori Sato , Mikael Starvik , Jesper Nilsson , Cris , Richard Henderson , Ivan Kokshaysky , Matt Turner , alpha Subject: Re: [PATCH 00/11] rcu: Add missing RCU idle APIs on idle loop v2 References: <1345733915-20040-1-git-send-email-fweisbec@gmail.com> <20120824212647.GU2472@linux.vnet.ibm.com> <1345857554.4840.43.camel@deadeye.wl.decadent.org.uk> In-Reply-To: <1345857554.4840.43.camel@deadeye.wl.decadent.org.uk> X-Enigmail-Version: 1.0.1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-DSPAM-Check: by mx3.orcon.net.nz on Sat, 25 Aug 2012 14:10:18 +1200 X-DSPAM-Result: Innocent X-DSPAM-Processed: Sat Aug 25 14:10:18 2012 X-DSPAM-Confidence: 0.7007 X-DSPAM-Probability: 0.0000 X-Bayes-Prob: 0.0001 (Score 0, tokens from: @@RPTN, default) X-Spam-Score: 0.00 () [Hold at 5.50] X-CanIt-Geo: ip=60.234.221.162; country=NZ; region=G2; city=Porirua; latitude=-41.1333; longitude=174.8500; http://maps.google.com/maps?q=-41.1333,174.8500&z=6 X-CanItPRO-Stream: base:default X-Canit-Stats-ID: 05HOOkzfm - 0541e52f6b08 - 20120825 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1996 Lines: 56 On 25/08/12 13:19, Ben Hutchings wrote: > On Fri, 2012-08-24 at 14:26 -0700, Paul E. McKenney wrote: >> On Thu, Aug 23, 2012 at 04:58:24PM +0200, Frederic Weisbecker wrote: >>> Hi, >>> >>> Changes since v1: >>> >>> - Fixed preempt handling in alpha idle loop >>> - added ack from Geert >>> - fixed stable email address, sorry :-/ >>> >>> This time I built tested everywhere but: h8300 (compiler internal error), >>> and mn10300, parisc, score (cross compilers not available in >>> ftp://ftp.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.6.3/) >>> >>> For testing, you can pull from: >>> >>> git://github.com/fweisbec/linux-dynticks.git >>> rcu/idle-fix-v2 >>> >>> Thanks. >> >> I have queued these on -rcu branch rcu/idle: >> >> git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git >> >> This problem has been in place since 3.3, so it is hard to argue that >> it is a regression for this merge window. I have therefore queued it >> for 3.7. > > I don't follow that; I would expect any serious bug fix (serious enough > for a stable update) to be acceptable for 3.6 at this point. > > If the regression occurred in 3.3, then the cc lines should be something > like: > > Cc: # 3.3+ > > and not the current: > > Cc: 3.2.x.. The Alpha patches fix an even earlier regression resulting in RCU CPU stalls on an SMP kernel built for generic Alpha (which includes the current Debian 3.2-alpha-smp kernel) and renders the kernel pretty much unuseable. I've only tested the two alpha patches together but maybe just the first patch (1/11 alpha: Fix preemption handling in idle loop) might be needed to fix the problem in 3.2. I'll test and let you know. Cheers Michael. -- 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/