extern struct rb_node *rb_nth(const struct rb_node *node, unsigned n);
extern int rb_rank(const struct rb_node *node, unsigned *rank);
-/* Fast replacement of a single node without remove/rebalance/add/rebalance */
-extern void rb_replace_node(struct rb_node *victim, struct rb_node *new,
- struct rb_root *root);
-
static inline void rb_link_node(struct rb_node * node, struct rb_node * parent,
struct rb_node ** rb_link)
{