nbr_pid_compare
RB_PROTOTYPE(nbr_pid_head, nbr, pid_tree, nbr_pid_compare)
static __inline int nbr_pid_compare(struct nbr *, struct nbr *);
RB_GENERATE(nbr_pid_head, nbr, pid_tree, nbr_pid_compare)
RB_PROTOTYPE(nbr_pid_head, nbr, pid_tree, nbr_pid_compare)
static __inline int nbr_pid_compare(struct nbr *, struct nbr *);
RB_GENERATE(nbr_pid_head, nbr, pid_tree, nbr_pid_compare)