1 /* SPDX-License-Identifier: GPL-2.0 */ 2 struct list { 3 struct list *next, *prev; 4 }; 5 6 static inline void 7 list_init(struct list *list) 8 { 9 list->next = list; 10 list->prev = list; 11 } 12 13 static inline int 14 list_empty(struct list *list) 15 { 16 return list->next == list; 17 } 18 19 static inline void 20 list_insert(struct list *link, struct list *new_link) 21 { 22 new_link->prev = link->prev; 23 new_link->next = link; 24 new_link->prev->next = new_link; 25 new_link->next->prev = new_link; 26 } 27 28 static inline void 29 list_append(struct list *list, struct list *new_link) 30 { 31 list_insert((struct list *)list, new_link); 32 } 33 34 static inline void 35 list_prepend(struct list *list, struct list *new_link) 36 { 37 list_insert(list->next, new_link); 38 } 39 40 static inline void 41 list_remove(struct list *link) 42 { 43 link->prev->next = link->next; 44 link->next->prev = link->prev; 45 } 46 47 #define list_entry(link, type, member) \ 48 ((type *)((char *)(link)-(unsigned long)(&((type *)0)->member))) 49 50 #define list_head(list, type, member) \ 51 list_entry((list)->next, type, member) 52 53 #define list_tail(list, type, member) \ 54 list_entry((list)->prev, type, member) 55 56 #define list_next(elm, member) \ 57 list_entry((elm)->member.next, typeof(*elm), member) 58 59 #define list_for_each_entry(pos, list, member) \ 60 for (pos = list_head(list, typeof(*pos), member); \ 61 &pos->member != (list); \ 62 pos = list_next(pos, member)) 63 64