linux-kernel - Re: [PATCH] net sysctl: Add place holder functions for when sysctl support is compiled out of the kernel.

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Date:	Mon, 23 Apr 2012 15:38:45 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	David Miller <davem@...emloft.net>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org
Subject: Re: [PATCH] net sysctl: Add place holder functions for when sysctl
 support is compiled out of the kernel.

On 04/23/2012 03:13 PM, Eric W. Biederman wrote:

> 
> Randy Dunlap <rdunlap@...otime.net> reported:
>> On 04/23/2012 12:07 AM, Stephen Rothwell wrote:
>>
>>> Hi all,
>>>
>>> Changes since 20120420:
>>
>>
>>
>> ERROR: "unregister_net_sysctl_table" [net/phonet/phonet.ko] undefined!
>> ERROR: "register_net_sysctl" [net/phonet/phonet.ko] undefined!
>>
>> when CONFIG_SYSCTL is not enabled.
> 
> Add static inline stub functions to gracefully handle the case when sysctl
> support is not present.
> 
> Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>


Yep, that works.

Acked-by: Randy Dunlap <rdunlap@...otime.net>

Thanks.

> ---
>  include/net/net_namespace.h |   15 ++++++++++++---
>  1 files changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
> index 3ee4a3d..ac9195e 100644
> --- a/include/net/net_namespace.h
> +++ b/include/net/net_namespace.h
> @@ -284,11 +284,20 @@ struct ctl_table_header;
>  
>  #ifdef CONFIG_SYSCTL
>  extern int net_sysctl_init(void);
> -#else
> -static inline int net_sysctl_init(void) { return 0; }
> -#endif
>  extern struct ctl_table_header *register_net_sysctl(struct net *net,
>  	const char *path, struct ctl_table *table);
>  extern void unregister_net_sysctl_table(struct ctl_table_header *header);
> +#else
> +static inline int net_sysctl_init(void) { return 0; }
> +static inline struct ctl_table_header *register_net_sysctl(struct net *net,
> +	const char *path, struct ctl_table *table)
> +{
> +	return NULL;
> +}
> +static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
> +{
> +}
> +#endif
> +
>  
>  #endif /* __NET_NET_NAMESPACE_H */



-- 
~Randy
--
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