netdev - Re: [PATCH 04/10] sunrpc: Use rcu

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Date:	Tue, 23 Jun 2009 12:59:13 -0400
From:	Trond Myklebust <Trond.Myklebust@...app.com>
To:	Jesper Dangaard Brouer <hawk@...x.dk>
Cc:	"David S. Miller" <davem@...emloft.net>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	dougthompson@...ssion.com, bluesmoke-devel@...ts.sourceforge.net,
	axboe@...nel.dk, Patrick McHardy <kaber@...sh.net>,
	christine.caulfield@...glemail.com, linux-wireless@...r.kernel.org,
	johannes@...solutions.net, yoshfuji@...ux-ipv6.org,
	shemminger@...ux-foundation.org, linux-nfs@...r.kernel.org,
	bfields@...ldses.org, neilb@...e.de, linux-ext4@...r.kernel.org,
	tytso@....edu, adilger@....com, netfilter-devel@...r.kernel.org
Subject: Re: [PATCH 04/10] sunrpc: Use rcu_barrier() on unload.

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 <hawk@...x.dk>
> ---
> 
>  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@...app.com>
-- 
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@...app.com
www.netapp.com
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