Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755716Ab2HYQSg (ORCPT ); Sat, 25 Aug 2012 12:18:36 -0400 Received: from e31.co.us.ibm.com ([32.97.110.149]:44019 "EHLO e31.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755158Ab2HYQSP (ORCPT ); Sat, 25 Aug 2012 12:18:15 -0400 Date: Sat, 25 Aug 2012 09:18:06 -0700 From: "Paul E. McKenney" To: Frederic Weisbecker Cc: Ben Hutchings , 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 , Michael Cree Subject: Re: [PATCH 00/11] rcu: Add missing RCU idle APIs on idle loop v2 Message-ID: <20120825161806.GD3436@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com 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> <20120825035047.GB3436@linux.vnet.ibm.com> <20120825131647.GA1994@somewhere> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120825131647.GA1994@somewhere> User-Agent: Mutt/1.5.21 (2010-09-15) X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12082516-7282-0000-0000-00000C4D08BB Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2325 Lines: 56 On Sat, Aug 25, 2012 at 03:16:49PM +0200, Frederic Weisbecker wrote: > On Fri, Aug 24, 2012 at 08:50:47PM -0700, Paul E. McKenney wrote: > > On Sat, Aug 25, 2012 at 02:19:14AM +0100, 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. > > > > OK, if any of the arch maintainers wishes to submit the patch to 3.6, > > they are free to do so -- just let me know and I will drop the patch from > > my tree. > > > > That said, all this does is cause spurious warnings to be printed, so > > not sure it really qualifies as serious. But I am happy to leave that > > decision with the individual arch maintainers -- it is their arch, > > after all, so their decision. > > Couldn't that cause hung tasks due to long lasting synchronize_rcu() ? In theory, definitely. In practice, they haven't been running into it, or they would be reporting hangs. Thanx, Paul -- 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/