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

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Date:   Tue, 2 May 2023 17:42:22 +0000
From:   Chuck Lever III <chuck.lever@...cle.com>
To:     Tom Rix <trix@...hat.com>
CC:     Jeff Layton <jlayton@...nel.org>,
        Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] nfsd: define exports_proc_ops with CONFIG_PROC_FS



> On May 2, 2023, at 1:11 PM, Tom Rix <trix@...hat.com> 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>

Provisionally applied to nfsd-fixes. Thanks!


> ---
> 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;
> -- 
> 2.27.0
> 

--
Chuck Lever