net: remove [un]register_pernet_gen_... and update the docs.

extern int register_pernet_device(struct pernet_operations *);

extern void unregister_pernet_device(struct pernet_operations *);

static inline int register_pernet_gen_subsys(int *id, struct pernet_operations *ops)

{

	ops->id = id;

	return register_pernet_subsys(ops);

}

static inline void unregister_pernet_gen_subsys(int id, struct pernet_operations *ops)

{

	return unregister_pernet_subsys(ops);

}

static inline int register_pernet_gen_device(int *id, struct pernet_operations *ops)

{

	ops->id = id;

	return register_pernet_device(ops);

}

static inline void unregister_pernet_gen_device(int id, struct pernet_operations *ops)

{

	return unregister_pernet_device(ops);

}

struct ctl_path;

struct ctl_table;

struct ctl_table_header;

 * stuff on the struct net without explicit struct net modification

 *

 * The rules are simple:

 * 1. register the ops with register_pernet_gen_device to get the id

 *    of your private pointer;

 * 2. call net_assign_generic() to put the private data on the struct

 * 1. set pernet_operations->id.  After register_pernet_device you

 *    will have the id of your private pointer.

 * 2. Either set pernet_operations->size (to have the code allocate and

 *    free a private structure pointed to from struct net ) or 

 *    call net_assign_generic() to put the private data on the struct

 *    net (most preferably this should be done in the ->init callback

 *    of the ops registered);

 * 3. do not change this pointer while the net is alive;