include/linux/list.h

945 	h->pprev = NULL;
958 	return !h->pprev;
971 	return !READ_ONCE(h->pprev);
986 	struct hlist_node **pprev = n->pprev;
988 	WRITE_ONCE(*pprev, next);
990 		WRITE_ONCE(next->pprev, pprev);
1004 	n->pprev = LIST_POISON2;
1034 		WRITE_ONCE(first->pprev, &n->next);
1036 	WRITE_ONCE(n->pprev, &h->first);
1047 	WRITE_ONCE(n->pprev, next->pprev);
1049 	WRITE_ONCE(next->pprev, &n->next);
1050 	WRITE_ONCE(*(n->pprev), n);
1063 	WRITE_ONCE(n->pprev, &prev->next);
1066 		WRITE_ONCE(n->next->pprev, &n->next);
1079 	n->pprev = &n->next;
1088 	return h->pprev == &h->next;
1102 	return !n->next && n->pprev == &h->first;
1110  * Move a list from one list head to another. Fixup the pprev
1118 		new->first->pprev = &new->first;
1135 		to->first->pprev = &last->next;
1138 	from->first->pprev = &to->first;