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
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