From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761350AbZLPKcO (ORCPT ); Wed, 16 Dec 2009 05:32:14 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755315AbZLPKcN (ORCPT ); Wed, 16 Dec 2009 05:32:13 -0500 Received: from bombadil.infradead.org ([18.85.46.34]:54070 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758970AbZLPKcL (ORCPT ); Wed, 16 Dec 2009 05:32:11 -0500 Subject: Re: [PATCH RFC tip/core/rcu 18/18] rcu: add primitives to check for RCU read-side critical sections From: Peter Zijlstra To: "Paul E. McKenney" Cc: linux-kernel@vger.kernel.org, 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, rostedt@goodmis.org, Valdis.Kletnieks@vt.edu, dhowells@redhat.com In-Reply-To: <12609181613745-git-send-email-> References: <20091215230213.GA9093@linux.vnet.ibm.com> <12609181613745-git-send-email-> Content-Type: text/plain; charset="UTF-8" Date: Wed, 16 Dec 2009 11:31:34 +0100 Message-ID: <1260959494.17860.46.camel@laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2009-12-15 at 15:02 -0800, Paul E. McKenney wrote: > > Also create rcu_dereference_check(), which takes a second boolean argument > into which one puts rcu_read_lock_held() or similar. For example: > > rcu_dereference_check(gp, rcu_read_lock_held() || > lockdep_is_held(my_lock)); Ah, so you're going to tackle this the other way around, interesting :-)