1#ifndef _LINUX_LIST_H
2#define _LINUX_LIST_H
3
4#include <linux/types.h>
5#include <linux/stddef.h>
6#include <linux/poison.h>
7#include <linux/const.h>
8#include <linux/kernel.h>
9
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18
19
20#define LIST_HEAD_INIT(name) { &(name), &(name) }
21
22#define LIST_HEAD(name) \
23 struct list_head name = LIST_HEAD_INIT(name)
24
25static inline void INIT_LIST_HEAD(struct list_head *list)
26{
27 list->next = list;
28 list->prev = list;
29}
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35
36
37#ifndef CONFIG_DEBUG_LIST
38static inline void __list_add(struct list_head *new,
39 struct list_head *prev,
40 struct list_head *next)
41{
42 next->prev = new;
43 new->next = next;
44 new->prev = prev;
45 prev->next = new;
46}
47#else
48extern void __list_add(struct list_head *new,
49 struct list_head *prev,
50 struct list_head *next);
51#endif
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60
61static inline void list_add(struct list_head *new, struct list_head *head)
62{
63 __list_add(new, head, head->next);
64}
65
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74
75static inline void list_add_tail(struct list_head *new, struct list_head *head)
76{
77 __list_add(new, head->prev, head);
78}
79
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85
86
87static inline void __list_del(struct list_head * prev, struct list_head * next)
88{
89 next->prev = prev;
90 prev->next = next;
91}
92
93
94
95
96
97
98
99#ifndef CONFIG_DEBUG_LIST
100static inline void __list_del_entry(struct list_head *entry)
101{
102 __list_del(entry->prev, entry->next);
103}
104
105static inline void list_del(struct list_head *entry)
106{
107 __list_del(entry->prev, entry->next);
108 entry->next = LIST_POISON1;
109 entry->prev = LIST_POISON2;
110}
111#else
112extern void __list_del_entry(struct list_head *entry);
113extern void list_del(struct list_head *entry);
114#endif
115
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120
121
122
123static inline void list_replace(struct list_head *old,
124 struct list_head *new)
125{
126 new->next = old->next;
127 new->next->prev = new;
128 new->prev = old->prev;
129 new->prev->next = new;
130}
131
132static inline void list_replace_init(struct list_head *old,
133 struct list_head *new)
134{
135 list_replace(old, new);
136 INIT_LIST_HEAD(old);
137}
138
139
140
141
142
143static inline void list_del_init(struct list_head *entry)
144{
145 __list_del_entry(entry);
146 INIT_LIST_HEAD(entry);
147}
148
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151
152
153
154static inline void list_move(struct list_head *list, struct list_head *head)
155{
156 __list_del_entry(list);
157 list_add(list, head);
158}
159
160
161
162
163
164
165static inline void list_move_tail(struct list_head *list,
166 struct list_head *head)
167{
168 __list_del_entry(list);
169 list_add_tail(list, head);
170}
171
172
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175
176
177static inline int list_is_last(const struct list_head *list,
178 const struct list_head *head)
179{
180 return list->next == head;
181}
182
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185
186
187static inline int list_empty(const struct list_head *head)
188{
189 return head->next == head;
190}
191
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204
205static inline int list_empty_careful(const struct list_head *head)
206{
207 struct list_head *next = head->next;
208 return (next == head) && (next == head->prev);
209}
210
211
212
213
214
215static inline void list_rotate_left(struct list_head *head)
216{
217 struct list_head *first;
218
219 if (!list_empty(head)) {
220 first = head->next;
221 list_move_tail(first, head);
222 }
223}
224
225
226
227
228
229static inline int list_is_singular(const struct list_head *head)
230{
231 return !list_empty(head) && (head->next == head->prev);
232}
233
234static inline void __list_cut_position(struct list_head *list,
235 struct list_head *head, struct list_head *entry)
236{
237 struct list_head *new_first = entry->next;
238 list->next = head->next;
239 list->next->prev = list;
240 list->prev = entry;
241 entry->next = list;
242 head->next = new_first;
243 new_first->prev = head;
244}
245
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259
260static inline void list_cut_position(struct list_head *list,
261 struct list_head *head, struct list_head *entry)
262{
263 if (list_empty(head))
264 return;
265 if (list_is_singular(head) &&
266 (head->next != entry && head != entry))
267 return;
268 if (entry == head)
269 INIT_LIST_HEAD(list);
270 else
271 __list_cut_position(list, head, entry);
272}
273
274static inline void __list_splice(const struct list_head *list,
275 struct list_head *prev,
276 struct list_head *next)
277{
278 struct list_head *first = list->next;
279 struct list_head *last = list->prev;
280
281 first->prev = prev;
282 prev->next = first;
283
284 last->next = next;
285 next->prev = last;
286}
287
288
289
290
291
292
293static inline void list_splice(const struct list_head *list,
294 struct list_head *head)
295{
296 if (!list_empty(list))
297 __list_splice(list, head, head->next);
298}
299
300
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303
304
305static inline void list_splice_tail(struct list_head *list,
306 struct list_head *head)
307{
308 if (!list_empty(list))
309 __list_splice(list, head->prev, head);
310}
311
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317
318
319static inline void list_splice_init(struct list_head *list,
320 struct list_head *head)
321{
322 if (!list_empty(list)) {
323 __list_splice(list, head, head->next);
324 INIT_LIST_HEAD(list);
325 }
326}
327
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335
336static inline void list_splice_tail_init(struct list_head *list,
337 struct list_head *head)
338{
339 if (!list_empty(list)) {
340 __list_splice(list, head->prev, head);
341 INIT_LIST_HEAD(list);
342 }
343}
344
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349
350
351#define list_entry(ptr, type, member) \
352 container_of(ptr, type, member)
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361
362#define list_first_entry(ptr, type, member) \
363 list_entry((ptr)->next, type, member)
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371
372
373#define list_last_entry(ptr, type, member) \
374 list_entry((ptr)->prev, type, member)
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382
383
384#define list_first_entry_or_null(ptr, type, member) \
385 (!list_empty(ptr) ? list_first_entry(ptr, type, member) : NULL)
386
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389
390
391
392#define list_next_entry(pos, member) \
393 list_entry((pos)->member.next, typeof(*(pos)), member)
394
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398
399
400#define list_prev_entry(pos, member) \
401 list_entry((pos)->member.prev, typeof(*(pos)), member)
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406
407
408#define list_for_each(pos, head) \
409 for (pos = (head)->next; pos != (head); pos = pos->next)
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414
415
416#define list_for_each_prev(pos, head) \
417 for (pos = (head)->prev; pos != (head); pos = pos->prev)
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423
424
425#define list_for_each_safe(pos, n, head) \
426 for (pos = (head)->next, n = pos->next; pos != (head); \
427 pos = n, n = pos->next)
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432
433
434
435#define list_for_each_prev_safe(pos, n, head) \
436 for (pos = (head)->prev, n = pos->prev; \
437 pos != (head); \
438 pos = n, n = pos->prev)
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443
444
445
446#define list_for_each_entry(pos, head, member) \
447 for (pos = list_first_entry(head, typeof(*pos), member); \
448 &pos->member != (head); \
449 pos = list_next_entry(pos, member))
450
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456
457#define list_for_each_entry_reverse(pos, head, member) \
458 for (pos = list_last_entry(head, typeof(*pos), member); \
459 &pos->member != (head); \
460 pos = list_prev_entry(pos, member))
461
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468
469
470#define list_prepare_entry(pos, head, member) \
471 ((pos) ? : list_entry(head, typeof(*pos), member))
472
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480
481
482#define list_for_each_entry_continue(pos, head, member) \
483 for (pos = list_next_entry(pos, member); \
484 &pos->member != (head); \
485 pos = list_next_entry(pos, member))
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494
495
496#define list_for_each_entry_continue_reverse(pos, head, member) \
497 for (pos = list_prev_entry(pos, member); \
498 &pos->member != (head); \
499 pos = list_prev_entry(pos, member))
500
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508
509#define list_for_each_entry_from(pos, head, member) \
510 for (; &pos->member != (head); \
511 pos = list_next_entry(pos, member))
512
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518
519
520#define list_for_each_entry_safe(pos, n, head, member) \
521 for (pos = list_first_entry(head, typeof(*pos), member), \
522 n = list_next_entry(pos, member); \
523 &pos->member != (head); \
524 pos = n, n = list_next_entry(n, member))
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535
536#define list_for_each_entry_safe_continue(pos, n, head, member) \
537 for (pos = list_next_entry(pos, member), \
538 n = list_next_entry(pos, member); \
539 &pos->member != (head); \
540 pos = n, n = list_next_entry(n, member))
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551
552#define list_for_each_entry_safe_from(pos, n, head, member) \
553 for (n = list_next_entry(pos, member); \
554 &pos->member != (head); \
555 pos = n, n = list_next_entry(n, member))
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566
567#define list_for_each_entry_safe_reverse(pos, n, head, member) \
568 for (pos = list_last_entry(head, typeof(*pos), member), \
569 n = list_prev_entry(pos, member); \
570 &pos->member != (head); \
571 pos = n, n = list_prev_entry(n, member))
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584
585#define list_safe_reset_next(pos, n, member) \
586 n = list_next_entry(pos, member)
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594
595#define HLIST_HEAD_INIT { .first = NULL }
596#define HLIST_HEAD(name) struct hlist_head name = { .first = NULL }
597#define INIT_HLIST_HEAD(ptr) ((ptr)->first = NULL)
598static inline void INIT_HLIST_NODE(struct hlist_node *h)
599{
600 h->next = NULL;
601 h->pprev = NULL;
602}
603
604static inline int hlist_unhashed(const struct hlist_node *h)
605{
606 return !h->pprev;
607}
608
609static inline int hlist_empty(const struct hlist_head *h)
610{
611 return !h->first;
612}
613
614static inline void __hlist_del(struct hlist_node *n)
615{
616 struct hlist_node *next = n->next;
617 struct hlist_node **pprev = n->pprev;
618 *pprev = next;
619 if (next)
620 next->pprev = pprev;
621}
622
623static inline void hlist_del(struct hlist_node *n)
624{
625 __hlist_del(n);
626 n->next = LIST_POISON1;
627 n->pprev = LIST_POISON2;
628}
629
630static inline void hlist_del_init(struct hlist_node *n)
631{
632 if (!hlist_unhashed(n)) {
633 __hlist_del(n);
634 INIT_HLIST_NODE(n);
635 }
636}
637
638static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h)
639{
640 struct hlist_node *first = h->first;
641 n->next = first;
642 if (first)
643 first->pprev = &n->next;
644 h->first = n;
645 n->pprev = &h->first;
646}
647
648
649static inline void hlist_add_before(struct hlist_node *n,
650 struct hlist_node *next)
651{
652 n->pprev = next->pprev;
653 n->next = next;
654 next->pprev = &n->next;
655 *(n->pprev) = n;
656}
657
658static inline void hlist_add_behind(struct hlist_node *n,
659 struct hlist_node *prev)
660{
661 n->next = prev->next;
662 prev->next = n;
663 n->pprev = &prev->next;
664
665 if (n->next)
666 n->next->pprev = &n->next;
667}
668
669
670static inline void hlist_add_fake(struct hlist_node *n)
671{
672 n->pprev = &n->next;
673}
674
675
676
677
678
679static inline void hlist_move_list(struct hlist_head *old,
680 struct hlist_head *new)
681{
682 new->first = old->first;
683 if (new->first)
684 new->first->pprev = &new->first;
685 old->first = NULL;
686}
687
688#define hlist_entry(ptr, type, member) container_of(ptr,type,member)
689
690#define hlist_for_each(pos, head) \
691 for (pos = (head)->first; pos ; pos = pos->next)
692
693#define hlist_for_each_safe(pos, n, head) \
694 for (pos = (head)->first; pos && ({ n = pos->next; 1; }); \
695 pos = n)
696
697#define hlist_entry_safe(ptr, type, member) \
698 ({ typeof(ptr) ____ptr = (ptr); \
699 ____ptr ? hlist_entry(____ptr, type, member) : NULL; \
700 })
701
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707
708#define hlist_for_each_entry(pos, head, member) \
709 for (pos = hlist_entry_safe((head)->first, typeof(*(pos)), member);\
710 pos; \
711 pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member))
712
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717
718#define hlist_for_each_entry_continue(pos, member) \
719 for (pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member);\
720 pos; \
721 pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member))
722
723
724
725
726
727
728#define hlist_for_each_entry_from(pos, member) \
729 for (; pos; \
730 pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member))
731
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738
739#define hlist_for_each_entry_safe(pos, n, head, member) \
740 for (pos = hlist_entry_safe((head)->first, typeof(*pos), member);\
741 pos && ({ n = pos->member.next; 1; }); \
742 pos = hlist_entry_safe(n, typeof(*pos), member))
743
744#endif
745