From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754205Ab0C2WX6 (ORCPT ); Mon, 29 Mar 2010 18:23:58 -0400 Received: from mx1.redhat.com ([209.132.183.28]:39783 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752985Ab0C2WX4 (ORCPT ); Mon, 29 Mar 2010 18:23:56 -0400 Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <20100329210520.GN2569@linux.vnet.ibm.com> References: <20100329210520.GN2569@linux.vnet.ibm.com> <20100329192159.GM2569@linux.vnet.ibm.com> <20100319022527.GC2894@linux.vnet.ibm.com> <20100318133302.29754.1584.stgit@warthog.procyon.org.uk> <19192.1269889348@redhat.com> <23274.1269893706@redhat.com> To: paulmck@linux.vnet.ibm.com, Eric Dumazet Cc: dhowells@redhat.com, Trond.Myklebust@netapp.com, linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] NFS: Fix RCU warnings in nfs_inode_return_delegation_noreclaim() [ver #2] Date: Mon, 29 Mar 2010 23:22:30 +0100 Message-ID: <25276.1269901350@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Paul E. McKenney wrote: > And rcu_dereference_raw() is the same as the old rcu_dereference(). Exactly. That's the other half of the issue - that interpolates a redundant memory barrier. David