[NETNS]: Declare init_net even without CONFIG_NET defined.

This does not look good, but there is no other choice. The compilation
without CONFIG_NET is broken and can not be fixed with ease.

After that there is no need for the following commits:
1567ca7eec
3edf8fa5cc
2d38f9a4f8

Revert them.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/netdevice.h

@@ -741,7 +741,6 @@ struct net_device
 #define	NETDEV_ALIGN		32
 #define	NETDEV_ALIGN_CONST	(NETDEV_ALIGN - 1)
 
-#ifdef CONFIG_NET
 /*
  * Net namespace inlines
  */
@@ -762,7 +761,6 @@ void dev_net_set(struct net_device *dev, struct net *net)
 	dev->nd_net = net;
 #endif
 }
-#endif
 
 /**
  *	netdev_priv - access network device private data
@@ -827,7 +825,6 @@ struct packet_type {
 extern rwlock_t				dev_base_lock;		/* Device list lock */
 
 
-#ifdef CONFIG_NET
 #define for_each_netdev(net, d)		\
 		list_for_each_entry(d, &(net)->dev_base_head, dev_list)
 #define for_each_netdev_safe(net, d, n)	\
@@ -851,7 +848,6 @@ static inline struct net_device *first_net_device(struct net *net)
 	return list_empty(&net->dev_base_head) ? NULL :
 		net_device_entry(net->dev_base_head.next);
 }
-#endif
 
 extern int 			netdev_boot_setup_check(struct net_device *dev);
 extern unsigned long		netdev_boot_base(const char *prefix, int unit);

include/net/net_namespace.h

@@ -60,11 +60,12 @@ struct net {
 };
 
 
-#ifdef CONFIG_NET
 #include <linux/seq_file_net.h>
 
 /* Init's network namespace */
 extern struct net init_net;
+
+#ifdef CONFIG_NET
 #define INIT_NET_NS(net_ns) .net_ns = &init_net,
 
 extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);

lib/kobject_uevent.c

@@ -19,12 +19,10 @@
 #include <linux/kobject.h>
 #include <linux/module.h>
 
-#ifdef CONFIG_NET
 #include <linux/socket.h>
 #include <linux/skbuff.h>
 #include <linux/netlink.h>
 #include <net/sock.h>
-#endif
 
 
 u64 uevent_seqnum;