linux-kernel - Re: [PATCH] nfs: Fix unused variable warning.

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Date:	Mon, 31 Oct 2011 11:18:43 -0400
From:	Trond Myklebust <Trond.Myklebust@...app.com>
To:	Rakib Mullick <rakib.mullick@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH] nfs: Fix unused variable warning.

On Fri, 2011-10-28 at 16:36 +0600, Rakib Mullick wrote: 
> When CONFIG_NFS=y, but CONFIG_NFS_V3_{,V4}=n we get the following warning:
> 
> 	fs/nfs/write.c: In function ‘nfs_writeback_done’:
> 	fs/nfs/write.c:1246:21: warning: unused variable ‘server’
> 
>  This patch fixes it.
> 
> Signed-off-by: Rakib Mullick <rakib.mullick@...il.com>
> ---
> 
> diff --git a/fs/nfs/write.c b/fs/nfs/write.c
> index 2219c88..e528e5c 100644
> --- a/fs/nfs/write.c
> +++ b/fs/nfs/write.c
> @@ -1243,7 +1243,6 @@ void nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data)
>  {
>  	struct nfs_writeargs	*argp = &data->args;
>  	struct nfs_writeres	*resp = &data->res;
> -	struct nfs_server	*server = NFS_SERVER(data->inode);
>  	int status;
>  
>  	dprintk("NFS: %5u nfs_writeback_done (status %d)\n",
> @@ -1272,6 +1271,8 @@ void nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data)
>  		 *	 as a dprintk() in order to avoid filling syslog.
>  		 */
>  		static unsigned long    complain;
> +		struct nfs_server	*server;
> +		server = NFS_SERVER(data->inode);
>  
>  		/* Note this will print the MDS for a DS write */
>  		if (time_before(complain, jiffies)) {

This will still cause a warning if you compile without RPC_DEBUG (e.g.
if CONFIG_SYSCTL isn't defined).

Since there is only one user, it seems better to just open-code the
NFS_SERVER(data->inode) in the dprintk()...

-- 
Trond Myklebust
Linux NFS client maintainer

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

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