From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758906Ab0EMNIX (ORCPT ); Thu, 13 May 2010 09:08:23 -0400 Received: from bombadil.infradead.org ([18.85.46.34]:59821 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758858Ab0EMNIP convert rfc822-to-8bit (ORCPT ); Thu, 13 May 2010 09:08:15 -0400 Subject: Re: [PATCH RFC tip/core/rcu 23/23] vhost: add __rcu annotations From: Peter Zijlstra To: paulmck@linux.vnet.ibm.com Cc: "Michael S. Tsirkin" , 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, eric.dumazet@gmail.com, Arnd Bergmann , Arnd Bergmann In-Reply-To: <20100512230057.GH2303@linux.vnet.ibm.com> References: <20100512213317.GA15085@linux.vnet.ibm.com> <1273700022-16523-23-git-send-email-paulmck@linux.vnet.ibm.com> <20100512214847.GD22930@redhat.com> <20100512230057.GH2303@linux.vnet.ibm.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Date: Thu, 13 May 2010 15:07:23 +0200 Message-ID: <1273756043.5605.3542.camel@twins> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2010-05-12 at 16:00 -0700, Paul E. McKenney wrote: > Any thoughts? One approach would be to create a separate lockdep class > for vhost workqueue state, similar to the approach used in instrument > rcu_read_lock() and friends. workqueue_struct::lockdep_map, its held while executing worklets. lock_is_held(&vhost_workqueue->lockdep_map), should do as you want.