From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ingo Molnar Subject: Re: [GIT PULL rcu/urgent] Fixes for RCU regressions in 3.8 Date: Thu, 24 Jan 2013 13:28:49 +0100 Message-ID: <20130124122849.GC3104@gmail.com> References: <20130111160813.GA14503@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: mingo@elte.hu, paul.gortmaker@windriver.com, fweisbec@gmail.com, linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org To: "Paul E. McKenney" Return-path: Received: from mail-ea0-f171.google.com ([209.85.215.171]:47793 "EHLO mail-ea0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754377Ab3AXM2y (ORCPT ); Thu, 24 Jan 2013 07:28:54 -0500 Content-Disposition: inline In-Reply-To: <20130111160813.GA14503@linux.vnet.ibm.com> Sender: linux-rt-users-owner@vger.kernel.org List-ID: * Paul E. McKenney wrote: > Hello, Ingo, > > Paul Gortmaker found some problems with no-CBs-CPU support in 3.8 > mainline, and kindly supplied fixes. The first problem is soft-lockup > complaints that can occur on systems running with no-CBs CPUs that have > long periods of time where RCU is completely idle, which can happen on > some embedded systems. The second problem is a documentation error > for the "rcutree.rcu_nocb_poll" boot parameter. In this case, Paul Gortmaker > (rightly) noted that the need for "rcutree." was inconsistent with the > "rcu_nocbs=" boot parameter. The fix therefore to make the boot > parameter named "rcu_nocb_poll". > > These problems only affect kernels built with the new CONFIG_RCU_NOCB_CPU > kernel parameter, but still should be fixed. > > These fixes are available in the git repository at: > git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/urgent > > Thanx, Paul > > ------------------> > Paul Gortmaker (2): > rcu: Prevent soft-lockup complaints about no-CBs CPUs > rcu: Make rcu_nocb_poll an early_param instead of module_param > > Documentation/kernel-parameters.txt | 2 +- > kernel/rcutree_plugin.h | 13 ++++++++++--- > 2 files changed, 11 insertions(+), 4 deletions(-) Pulled, thanks a lot Paul! Ingo