From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753909Ab0ADXIy (ORCPT ); Mon, 4 Jan 2010 18:08:54 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753435Ab0ADXIx (ORCPT ); Mon, 4 Jan 2010 18:08:53 -0500 Received: from e8.ny.us.ibm.com ([32.97.182.138]:59962 "EHLO e8.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753094Ab0ADXIx (ORCPT ); Mon, 4 Jan 2010 18:08:53 -0500 Date: Mon, 4 Jan 2010 15:08:50 -0800 From: "Paul E. McKenney" To: linux-kernel@vger.kernel.org Cc: mingo@elte.hu, laijs@cn.fujitsu.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca, josh@joshtriplett.org, dvhltc@us.ibm.com, niv@us.ibm.com, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, Valdis.Kletnieks@vt.edu, dhowells@redhat.com Subject: [PATCH tip/core/rcu 0/11] rcu: suppress GP start to simplify force_quiescent_state() Message-ID: <20100104230850.GA22111@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.15+20070412 (2007-04-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello! This patch series makes a sequence of changes that prevent a new RCU grace period from starting while force_quiescent_state() is the the process of trying to cause the prior grace period to complete. This simplifies the code and eliminates numerous painful race conditions. Thanx, Paul b/include/linux/rcutiny.h | 12 +++ b/include/linux/rcutree.h | 3 b/kernel/rcutorture.c | 80 +++++++++++++++++++++++- b/kernel/rcutree.c | 28 +++++--- b/kernel/rcutree.h | 3 b/kernel/rcutree_plugin.h | 20 +++++- kernel/rcutree.c | 153 +++++++++++++++++++++------------------------- kernel/rcutree.h | 15 ++-- 8 files changed, 211 insertions(+), 103 deletions(-)