From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763623AbYDOBr1 (ORCPT ); Mon, 14 Apr 2008 21:47:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758961AbYDOBrT (ORCPT ); Mon, 14 Apr 2008 21:47:19 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:51082 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758503AbYDOBrT (ORCPT ); Mon, 14 Apr 2008 21:47:19 -0400 Date: Mon, 14 Apr 2008 18:45:44 -0700 From: Andrew Morton To: paulmck@linux.vnet.ibm.com, linux-kernel@vger.kernel.org, mathieu.desnoyers@polymtl.ca, mingo@elte.hu, hch@infradead.org, mmlnx@us.ibm.com, dipankar@in.ibm.com, dsmith@redhat.com, rostedt@goodmis.org, adrian.bunk@movial.fi, a.p.zijlstra@chello.nl, ego@in.ibm.com, niv@us.ibm.com, dvhltc@us.ibm.com, rusty@au1.ibm.com, jkenisto@linux.vnet.ibm.com, oleg@tv-sign.ru, jamesclhuang@yahoo.com Subject: Re: [PATCH 0/5] call_rcu_sched() series Message-Id: <20080414184544.16ae4123.akpm@linux-foundation.org> In-Reply-To: <20080414183312.eba58a41.akpm@linux-foundation.org> References: <20080414035848.GA30005@linux.vnet.ibm.com> <20080414183312.eba58a41.akpm@linux-foundation.org> X-Mailer: Sylpheed 2.4.8 (GTK+ 2.12.5; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 14 Apr 2008 18:33:12 -0700 Andrew Morton wrote: > On Sun, 13 Apr 2008 20:58:48 -0700 "Paul E. McKenney" wrote: > > > This series adds call_rcu_sched(), applies some fixes to RCU Classic, > > adds rcu_barrier_sched(), updates rcutorture, and updates the RCU > > documentation. > > Some massaging was needed here to make these apply against the > RCU changes in git-sched. > > All fairly simple, except I don't know if these: > > static inline void rcu_enter_nohz(void) > { > smp_mb(); /* CPUs seeing ++ must see prior RCU read-side crit sects */ > __get_cpu_var(rcu_dyntick_sched).dynticks++; > WARN_ON(__get_cpu_var(rcu_dyntick_sched).dynticks & 0x1); > } > > static inline void rcu_exit_nohz(void) > { > __get_cpu_var(rcu_dyntick_sched).dynticks++; > smp_mb(); /* CPUs seeing ++ must see later RCU read-side crit sects */ > WARN_ON(!(__get_cpu_var(rcu_dyntick_sched).dynticks & 0x1)); > } > > in include/linux/rcupreempt.h ended up the way we want them? argh, I see. It's all tangled up with the WARN_ON_SECS stuff. Let me try to straighten it all out.