to_ns_tree
#define ns_tree_add_raw(__ns) __ns_tree_add_raw(to_ns_common(__ns), to_ns_tree(__ns))
__ns_tree_add(to_ns_common(__ns), to_ns_tree(__ns), \
#define ns_tree_remove(__ns) __ns_tree_remove(to_ns_common(__ns), to_ns_tree(__ns))
__ns_tree_adjoined_rcu(to_ns_common(__ns), to_ns_tree(__ns), __previous)