450     struct list_head *head, **tail = &head;  in merge()  local
455             *tail = a;  in merge()
456             tail = &a->next;  in merge()
459                 *tail = b;  in merge()
463             *tail = b;  in merge()
464             tail = &b->next;  in merge()
467                 *tail = a;  in merge()
485     struct list_head *tail = head;  in merge_final()  local
491             tail->next = a;  in merge_final()
492             a->prev = tail;  in merge_final()
493             tail = a;  in merge_final()
498             tail->next = b;  in merge_final()
499             b->prev = tail;  in merge_final()
500             tail = b;  in merge_final()
510     tail->next = b;  in merge_final()
521         b->prev = tail;  in merge_final()
522         tail = b;  in merge_final()
527     tail->next = head;  in merge_final()
528     head->prev = tail;  in merge_final()
562         struct list_head **tail = &pending;  in list_sort()  local
566             tail = &(*tail)->prev;  in list_sort()
569             struct list_head *a = *tail, *b = a->prev;  in list_sort()
574             *tail = a;  in list_sort()