From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753359Ab1HBFoR (ORCPT ); Tue, 2 Aug 2011 01:44:17 -0400 Received: from shards.monkeyblade.net ([198.137.202.13]:49109 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752429Ab1HBFoK (ORCPT ); Tue, 2 Aug 2011 01:44:10 -0400 Date: Mon, 01 Aug 2011 22:44:01 -0700 (PDT) Message-Id: <20110801.224401.31810103988544647.davem@davemloft.net> To: shemminger@vyatta.com Cc: eric.dumazet@gmail.com, paulmck@linux.vnet.ibm.com, mchan@broadcom.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH] rcu: convert uses of rcu_assign_pointer(x, NULL) to RCU_INIT_POINTER From: David Miller In-Reply-To: <20110801091900.1027396f@nehalam.ftrdhcpuser.net> References: <20110801052342.GD2307@linux.vnet.ibm.com> <1312188453.2719.1.camel@edumazet-laptop> <20110801091900.1027396f@nehalam.ftrdhcpuser.net> X-Mailer: Mew version 6.3 on Emacs 23.2 / Mule 6.0 (HANACHIRUSATO) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.2.6 (shards.monkeyblade.net [198.137.202.13]); Mon, 01 Aug 2011 22:44:06 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Stephen Hemminger Date: Mon, 1 Aug 2011 09:19:00 -0700 > When assigning a NULL value to an RCU protected pointer, no barrier > is needed. The rcu_assign_pointer, used to handle that but will soon > change to not handle the special case. > > Convert all rcu_assign_pointer of NULL value. > > //smpl > @@ expression P; @@ > > - rcu_assign_pointer(P, NULL) > + RCU_INIT_POINTER(P, NULL) > > // > > > Signed-off-by: Stephen Hemminger Acked-by: David S. Miller