From: Trond Myklebust Subject: Re: [PATCH 04/10] sunrpc: Use rcu_barrier() on unload. Date: Tue, 23 Jun 2009 12:59:13 -0400 Message-ID: <1245776353.9586.1.camel@heimdal.trondhjem.org> References: <20090623150330.22490.87327.stgit@localhost> <20090623150414.22490.14888.stgit@localhost> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: "David S. Miller" , "Paul E. McKenney" , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, dougthompson@xmission.com, bluesmoke-devel@lists.sourceforge.net, axboe@kernel.dk, Patrick McHardy , christine.caulfield@googlemail.com, linux-wireless@vger.kernel.org, johannes@sipsolutions.net, yoshfuji@linux-ipv6.org, shemminger@linux-foundation.org, linux-nfs@vger.kernel.org, bfields@fieldses.org, neilb@suse.de, linux-ext4@vger.kernel.org, tytso@mit.edu, adilger@sun.com, netfilter-devel@vger.kernel.org To: Jesper Dangaard Brouer Return-path: In-Reply-To: <20090623150414.22490.14888.stgit@localhost> Sender: netfilter-devel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org On Tue, 2009-06-23 at 17:04 +0200, Jesper Dangaard Brouer wrote: > The sunrpc module uses rcu_call() thus it should use rcu_barrier() on > module unload. > > Have not verified that the possibility for new call_rcu() callbacks > has been disabled. As a hint for checking, the functions calling > call_rcu() (unx_destroy_cred and generic_destroy_cred) are > registered as crdestroy function pointer in struct rpc_credops. > > Signed-off-by: Jesper Dangaard Brouer > --- > > net/sunrpc/sunrpc_syms.c | 1 + > 1 files changed, 1 insertions(+), 0 deletions(-) > > diff --git a/net/sunrpc/sunrpc_syms.c b/net/sunrpc/sunrpc_syms.c > index 843629f..adaa819 100644 > --- a/net/sunrpc/sunrpc_syms.c > +++ b/net/sunrpc/sunrpc_syms.c > @@ -66,6 +66,7 @@ cleanup_sunrpc(void) > #ifdef CONFIG_PROC_FS > rpc_proc_exit(); > #endif > + rcu_barrier(); /* Wait for completion of call_rcu()'s */ > } > MODULE_LICENSE("GPL"); > module_init(init_sunrpc); > Acked-by: Trond Myklebust -- Trond Myklebust Linux NFS client maintainer NetApp Trond.Myklebust@netapp.com www.netapp.com