linux-kernel - Re: [PATCH] nfsd: define exports_proc_ops with CONFIG_PROC

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Date:   Tue, 02 May 2023 14:16:33 -0400
From:   Jeff Layton <jlayton@...nel.org>
To:     Tom Rix <trix@...hat.com>, chuck.lever@...cle.com
Cc:     linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nfsd: define exports_proc_ops with CONFIG_PROC_FS

On Tue, 2023-05-02 at 13:11 -0400, Tom Rix wrote:
> gcc with W=1 and ! CONFIG_PROC_FS
> fs/nfsd/nfsctl.c:161:30: error: ‘exports_proc_ops’
>   defined but not used [-Werror=unused-const-variable=]
>   161 | static const struct proc_ops exports_proc_ops = {
>       |                              ^~~~~~~~~~~~~~~~
> 
> The only use of exports_proc_ops is when CONFIG_PROC_FS
> is defined, so its definition should be likewise conditional.
> 
> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
>  fs/nfsd/nfsctl.c | 25 +++++++++++++------------
>  1 file changed, 13 insertions(+), 12 deletions(-)
> 
> diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
> index 7b8f17ee5224..c159817d1282 100644
> --- a/fs/nfsd/nfsctl.c
> +++ b/fs/nfsd/nfsctl.c
> @@ -153,18 +153,6 @@ static int exports_net_open(struct net *net, struct file *file)
>  	return 0;
>  }
>  
> -static int exports_proc_open(struct inode *inode, struct file *file)
> -{
> -	return exports_net_open(current->nsproxy->net_ns, file);
> -}
> -
> -static const struct proc_ops exports_proc_ops = {
> -	.proc_open	= exports_proc_open,
> -	.proc_read	= seq_read,
> -	.proc_lseek	= seq_lseek,
> -	.proc_release	= seq_release,
> -};
> -
>  static int exports_nfsd_open(struct inode *inode, struct file *file)
>  {
>  	return exports_net_open(inode->i_sb->s_fs_info, file);
> @@ -1458,6 +1446,19 @@ static struct file_system_type nfsd_fs_type = {
>  MODULE_ALIAS_FS("nfsd");
>  
>  #ifdef CONFIG_PROC_FS
> +
> +static int exports_proc_open(struct inode *inode, struct file *file)
> +{
> +	return exports_net_open(current->nsproxy->net_ns, file);
> +}
> +
> +static const struct proc_ops exports_proc_ops = {
> +	.proc_open	= exports_proc_open,
> +	.proc_read	= seq_read,
> +	.proc_lseek	= seq_lseek,
> +	.proc_release	= seq_release,
> +};
> +
>  static int create_proc_exports_entry(void)
>  {
>  	struct proc_dir_entry *entry;

Reviewed-by: Jeff Layton <jlayton@...nel.org>