Messages in this thread |  | | | Subject | Re: [PATCH 5/5] sunrpc/auth_gss: Call rcu_barrier() on module unload. | | From | Trond Myklebust <> | | Date | Mon, 08 Jun 2009 13:00:49 -0400 |
On Mon, 2009-06-08 at 09:26 -0700, Paul E. McKenney wrote: > On Mon, Jun 08, 2009 at 03:11:48PM +0200, Jesper Dangaard Brouer wrote: > > As the module uses rcu_call() we should make sure that all > > rcu callback has been completed before removing the code. > > Good improvement!!! Assuming that gss_svc_shutdown() and > rpcauth_unregister() prevent any future RCU callbacks to be registered, > this patch will fix things up. > > Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> > > > Signed-off-by: Jesper Dangaard Brouer <hawk@comx.dk> > > --- > > > > net/sunrpc/auth_gss/auth_gss.c | 1 + > > 1 files changed, 1 insertions(+), 0 deletions(-) > > > > diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c > > index e630b38..66d458f 100644 > > --- a/net/sunrpc/auth_gss/auth_gss.c > > +++ b/net/sunrpc/auth_gss/auth_gss.c > > @@ -1548,6 +1548,7 @@ static void __exit exit_rpcsec_gss(void) > > { > > gss_svc_shutdown(); > > rpcauth_unregister(&authgss_ops); > > + rcu_barrier(); /* Wait for completion of call_rcu()'s */ > > } > > > > MODULE_LICENSE("GPL"); > >
Hmm... If this is about ensuring that all the call_rcu() callbacks complete before we remove the module, then don't we also need similar barriers in net/sunrpc/sunrpc_syms.c:cleanup_sunrpc() and in fs/nfs/inode.c:exit_nfs_fs()?
Cheers Trond -- Trond Myklebust Linux NFS client maintainer
NetApp Trond.Myklebust@netapp.com www.netapp.com
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