From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753354Ab0CATDe (ORCPT ); Mon, 1 Mar 2010 14:03:34 -0500 Received: from e4.ny.us.ibm.com ([32.97.182.144]:34414 "EHLO e4.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751650Ab0CATDc (ORCPT ); Mon, 1 Mar 2010 14:03:32 -0500 Date: Mon, 1 Mar 2010 11:03:29 -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 RFC tip/core/rcu 0/2] rcu: make RCU lockdep handle early boot in organized manner Message-ID: <20100301190329.GA26892@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 set makes RCU lockdep handle early boot in an organized manner: 1. Make rcu_read_lock_held(), rcu_read_lock_bh_held(), rcu_read_lock_sched_held(), and rcu_dereference_check() suppress complaints if !rcu_scheduler_active. The rationale for this approach is that RCU grace periods are handled very differently during early boot, and rcu_scheduler_active marks the point that normal runtime RCU behavior starts. 2. Remove the !rcu_scheduler_active check from calls to rcu_dereference_check(), because rcu_dereference_check() already does the check in question. Testing in progress, but want to get these out for review. Thanx, Paul ------------------------------------------------------------------------ cgroup.h | 2 -- rcupdate.h | 27 +++++++++++++++++---------- 2 files changed, 17 insertions(+), 12 deletions(-)