[PATCH] sysctl: fix unused proc_cap_handler() function warning

[PATCH] sysctl: fix unused proc_cap_handler() function warning

[Arnd Bergmann]

From: Arnd Bergmann <arnd@arndb.de>

Since usermodehelper_table() is marked static now, we get a
warning about it being unused when SYSCTL is disabled:

kernel/umh.c:497:12: error: 'proc_cap_handler' defined but not used [-Werror=unused-function]

Just move it inside of the same #ifdef.

Fixes: e6944e3b75df7 ("sysctl: move umh sysctl registration to its own file")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 kernel/umh.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/umh.c b/kernel/umh.c
index d5dc3cc92d5c6..2f9249c2bf6ce 100644
--- a/kernel/umh.c
+++ b/kernel/umh.c
@@ -494,6 +494,7 @@ int call_usermodehelper(const char *path, char **argv, char **envp, int wait)
 }
 EXPORT_SYMBOL(call_usermodehelper);
 
+#if defined(CONFIG_SYSCTL)
 static int proc_cap_handler(struct ctl_table *table, int write,
 			 void *buffer, size_t *lenp, loff_t *ppos)
 {
@@ -544,7 +545,6 @@ static int proc_cap_handler(struct ctl_table *table, int write,
 	return 0;
 }
 
-#if defined(CONFIG_SYSCTL)
 static struct ctl_table usermodehelper_table[] = {
 	{
 		.procname	= "bset",
-- 
2.39.2

Re: [PATCH] sysctl: fix unused proc_cap_handler() function warning

[Randy Dunlap]

On 6/7/23 05:08, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> Since usermodehelper_table() is marked static now, we get a
> warning about it being unused when SYSCTL is disabled:
> 
> kernel/umh.c:497:12: error: 'proc_cap_handler' defined but not used [-Werror=unused-function]
> 
> Just move it inside of the same #ifdef.
> 
> Fixes: e6944e3b75df7 ("sysctl: move umh sysctl registration to its own file")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>


Acked-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org> # build-tested

Thanks.

> ---
>  kernel/umh.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/umh.c b/kernel/umh.c
> index d5dc3cc92d5c6..2f9249c2bf6ce 100644
> --- a/kernel/umh.c
> +++ b/kernel/umh.c
> @@ -494,6 +494,7 @@ int call_usermodehelper(const char *path, char **argv, char **envp, int wait)
>  }
>  EXPORT_SYMBOL(call_usermodehelper);
>  
> +#if defined(CONFIG_SYSCTL)
>  static int proc_cap_handler(struct ctl_table *table, int write,
>  			 void *buffer, size_t *lenp, loff_t *ppos)
>  {
> @@ -544,7 +545,6 @@ static int proc_cap_handler(struct ctl_table *table, int write,
>  	return 0;
>  }
>  
> -#if defined(CONFIG_SYSCTL)
>  static struct ctl_table usermodehelper_table[] = {
>  	{
>  		.procname	= "bset",

-- 
~Randy

Re: [PATCH] sysctl: fix unused proc_cap_handler() function warning

[Matthieu Baerts]

Hi Arnd,

On 07/06/2023 14:08, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> Since usermodehelper_table() is marked static now, we get a
> warning about it being unused when SYSCTL is disabled:
> 
> kernel/umh.c:497:12: error: 'proc_cap_handler' defined but not used [-Werror=unused-function]

Thank you for the patch!

We also hit the same issue on our side after today's sync with Linus'
tree. I confirm this patch fixes the issue.

Tested-by: Matthieu Baerts <matthieu.baerts@tessares.net>

I didn't see this patch applied in Luis' sysctl-next branch, do you know
who is taking care of it?

> Just move it inside of the same #ifdef.
> 
> Fixes: e6944e3b75df7 ("sysctl: move umh sysctl registration to its own file")

A small detail: it looks like the SHA has been modified, it should be
861dc0b46432 instead of e6944e3b75df7:

Fixes: 861dc0b46432 ("sysctl: move umh sysctl registration to its own file")

Cheers,
Matt
-- 
Tessares | Belgium | Hybrid Access Solutions
www.tessares.net

Re: [PATCH] sysctl: fix unused proc_cap_handler() function warning

[Luis Chamberlain]

On Thu, Jun 29, 2023 at 05:00:42PM +0200, Matthieu Baerts wrote:
> Hi Arnd,
> 
> On 07/06/2023 14:08, Arnd Bergmann wrote:
> > From: Arnd Bergmann <arnd@arndb.de>
> > 
> > Since usermodehelper_table() is marked static now, we get a
> > warning about it being unused when SYSCTL is disabled:
> > 
> > kernel/umh.c:497:12: error: 'proc_cap_handler' defined but not used [-Werror=unused-function]
> 
> Thank you for the patch!
> 
> We also hit the same issue on our side after today's sync with Linus'
> tree. I confirm this patch fixes the issue.
> 
> Tested-by: Matthieu Baerts <matthieu.baerts@tessares.net>
> 
> I didn't see this patch applied in Luis' sysctl-next branch, do you know
> who is taking care of it?

I'll send a second pull request to Linus now.

> > Just move it inside of the same #ifdef.
> > 
> > Fixes: e6944e3b75df7 ("sysctl: move umh sysctl registration to its own file")
> 
> A small detail: it looks like the SHA has been modified, it should be
> 861dc0b46432 instead of e6944e3b75df7:
> 
> Fixes: 861dc0b46432 ("sysctl: move umh sysctl registration to its own file")

Adjusted, thanks.

 Luis