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

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Randy Dunlap <rdunlap@xxxxxxxxxxxx> 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@xxxxxxxxxxxx>
 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;
 extern int net_sysctl_init(void);
-static inline int net_sysctl_init(void) { return 0; }
 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);
+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 /* __NET_NET_NAMESPACE_H */

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