1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __TOOLS_LINUX_LIST_H
3#define __TOOLS_LINUX_LIST_H
4
5#include <linux/types.h>
6#include <linux/poison.h>
7#include <linux/kernel.h>
8#include <linux/compiler.h>
9
10/*
11 * Simple doubly linked list implementation.
12 *
13 * Some of the internal functions ("__xxx") are useful when
14 * manipulating whole lists rather than single entries, as
15 * sometimes we already know the next/prev entries and we can
16 * generate better code by using them directly rather than
17 * using the generic single-entry routines.
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}
30
31/*
32 * Insert a new entry between two known consecutive entries.
33 *
34 * This is only for internal list manipulation where we know
35 * the prev/next entries already!
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
52
53/**
54 * list_add - add a new entry
55 * @new: new entry to be added
56 * @head: list head to add it after
57 *
58 * Insert a new entry after the specified head.
59 * This is good for implementing stacks.
60 */
61static inline void list_add(struct list_head *new, struct list_head *head)
62{
63 __list_add(new, prev: head, next: head->next);
64}
65
66
67/**
68 * list_add_tail - add a new entry
69 * @new: new entry to be added
70 * @head: list head to add it before
71 *
72 * Insert a new entry before the specified head.
73 * This is useful for implementing queues.
74 */
75static inline void list_add_tail(struct list_head *new, struct list_head *head)
76{
77 __list_add(new, prev: head->prev, next: head);
78}
79
80/*
81 * Delete a list entry by making the prev/next entries
82 * point to each other.
83 *
84 * This is only for internal list manipulation where we know
85 * the prev/next entries already!
86 */
87static inline void __list_del(struct list_head * prev, struct list_head * next)
88{
89 next->prev = prev;
90 WRITE_ONCE(prev->next, next);
91}
92
93/**
94 * list_del - deletes entry from list.
95 * @entry: the element to delete from the list.
96 * Note: list_empty() on entry does not return true after this, the entry is
97 * in an undefined state.
98 */
99#ifndef CONFIG_DEBUG_LIST
100static inline void __list_del_entry(struct list_head *entry)
101{
102 __list_del(prev: entry->prev, next: entry->next);
103}
104
105static inline void list_del(struct list_head *entry)
106{
107 __list_del(prev: entry->prev, next: 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
116/**
117 * list_replace - replace old entry by new one
118 * @old : the element to be replaced
119 * @new : the new element to insert
120 *
121 * If @old was empty, it will be overwritten.
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(list: old);
137}
138
139/**
140 * list_del_init - deletes entry from list and reinitialize it.
141 * @entry: the element to delete from the list.
142 */
143static inline void list_del_init(struct list_head *entry)
144{
145 __list_del_entry(entry);
146 INIT_LIST_HEAD(list: entry);
147}
148
149/**
150 * list_move - delete from one list and add as another's head
151 * @list: the entry to move
152 * @head: the head that will precede our entry
153 */
154static inline void list_move(struct list_head *list, struct list_head *head)
155{
156 __list_del_entry(entry: list);
157 list_add(new: list, head);
158}
159
160/**
161 * list_move_tail - delete from one list and add as another's tail
162 * @list: the entry to move
163 * @head: the head that will follow our entry
164 */
165static inline void list_move_tail(struct list_head *list,
166 struct list_head *head)
167{
168 __list_del_entry(entry: list);
169 list_add_tail(new: list, head);
170}
171
172/**
173 * list_is_last - tests whether @list is the last entry in list @head
174 * @list: the entry to test
175 * @head: the head of the list
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
183/**
184 * list_empty - tests whether a list is empty
185 * @head: the list to test.
186 */
187static inline int list_empty(const struct list_head *head)
188{
189 return head->next == head;
190}
191
192/**
193 * list_empty_careful - tests whether a list is empty and not being modified
194 * @head: the list to test
195 *
196 * Description:
197 * tests whether a list is empty _and_ checks that no other CPU might be
198 * in the process of modifying either member (next or prev)
199 *
200 * NOTE: using list_empty_careful() without synchronization
201 * can only be safe if the only activity that can happen
202 * to the list entry is list_del_init(). Eg. it cannot be used
203 * if another CPU could re-list_add() it.
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 * list_rotate_left - rotate the list to the left
213 * @head: the head of the list
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(list: first, head);
222 }
223}
224
225/**
226 * list_is_singular - tests whether a list has just one entry.
227 * @head: the list to test.
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
246/**
247 * list_cut_position - cut a list into two
248 * @list: a new list to add all removed entries
249 * @head: a list with entries
250 * @entry: an entry within head, could be the head itself
251 * and if so we won't cut the list
252 *
253 * This helper moves the initial part of @head, up to and
254 * including @entry, from @head to @list. You should
255 * pass on @entry an element you know is on @head. @list
256 * should be an empty list or a list you do not care about
257 * losing its data.
258 *
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 * list_splice - join two lists, this is designed for stacks
290 * @list: the new list to add.
291 * @head: the place to add it in the first list.
292 */
293static inline void list_splice(const struct list_head *list,
294 struct list_head *head)
295{
296 if (!list_empty(head: list))
297 __list_splice(list, prev: head, next: head->next);
298}
299
300/**
301 * list_splice_tail - join two lists, each list being a queue
302 * @list: the new list to add.
303 * @head: the place to add it in the first list.
304 */
305static inline void list_splice_tail(struct list_head *list,
306 struct list_head *head)
307{
308 if (!list_empty(head: list))
309 __list_splice(list, prev: head->prev, next: head);
310}
311
312/**
313 * list_splice_init - join two lists and reinitialise the emptied list.
314 * @list: the new list to add.
315 * @head: the place to add it in the first list.
316 *
317 * The list at @list is reinitialised
318 */
319static inline void list_splice_init(struct list_head *list,
320 struct list_head *head)
321{
322 if (!list_empty(head: list)) {
323 __list_splice(list, prev: head, next: head->next);
324 INIT_LIST_HEAD(list);
325 }
326}
327
328/**
329 * list_splice_tail_init - join two lists and reinitialise the emptied list
330 * @list: the new list to add.
331 * @head: the place to add it in the first list.
332 *
333 * Each of the lists is a queue.
334 * The list at @list is reinitialised
335 */
336static inline void list_splice_tail_init(struct list_head *list,
337 struct list_head *head)
338{
339 if (!list_empty(head: list)) {
340 __list_splice(list, prev: head->prev, next: head);
341 INIT_LIST_HEAD(list);
342 }
343}
344
345/**
346 * list_entry - get the struct for this entry
347 * @ptr: the &struct list_head pointer.
348 * @type: the type of the struct this is embedded in.
349 * @member: the name of the list_head within the struct.
350 */
351#define list_entry(ptr, type, member) \
352 container_of(ptr, type, member)
353
354/**
355 * list_first_entry - get the first element from a list
356 * @ptr: the list head to take the element from.
357 * @type: the type of the struct this is embedded in.
358 * @member: the name of the list_head within the struct.
359 *
360 * Note, that list is expected to be not empty.
361 */
362#define list_first_entry(ptr, type, member) \
363 list_entry((ptr)->next, type, member)
364
365/**
366 * list_last_entry - get the last element from a list
367 * @ptr: the list head to take the element from.
368 * @type: the type of the struct this is embedded in.
369 * @member: the name of the list_head within the struct.
370 *
371 * Note, that list is expected to be not empty.
372 */
373#define list_last_entry(ptr, type, member) \
374 list_entry((ptr)->prev, type, member)
375
376/**
377 * list_first_entry_or_null - get the first element from a list
378 * @ptr: the list head to take the element from.
379 * @type: the type of the struct this is embedded in.
380 * @member: the name of the list_head within the struct.
381 *
382 * Note that if the list is empty, it returns NULL.
383 */
384#define list_first_entry_or_null(ptr, type, member) \
385 (!list_empty(ptr) ? list_first_entry(ptr, type, member) : NULL)
386
387/**
388 * list_last_entry_or_null - get the last element from a list
389 * @ptr: the list head to take the element from.
390 * @type: the type of the struct this is embedded in.
391 * @member: the name of the list_head within the struct.
392 *
393 * Note that if the list is empty, it returns NULL.
394 */
395#define list_last_entry_or_null(ptr, type, member) \
396 (!list_empty(ptr) ? list_last_entry(ptr, type, member) : NULL)
397
398/**
399 * list_next_entry - get the next element in list
400 * @pos: the type * to cursor
401 * @member: the name of the list_head within the struct.
402 */
403#define list_next_entry(pos, member) \
404 list_entry((pos)->member.next, typeof(*(pos)), member)
405
406/**
407 * list_prev_entry - get the prev element in list
408 * @pos: the type * to cursor
409 * @member: the name of the list_head within the struct.
410 */
411#define list_prev_entry(pos, member) \
412 list_entry((pos)->member.prev, typeof(*(pos)), member)
413
414/**
415 * list_for_each - iterate over a list
416 * @pos: the &struct list_head to use as a loop cursor.
417 * @head: the head for your list.
418 */
419#define list_for_each(pos, head) \
420 for (pos = (head)->next; pos != (head); pos = pos->next)
421
422/**
423 * list_for_each_prev - iterate over a list backwards
424 * @pos: the &struct list_head to use as a loop cursor.
425 * @head: the head for your list.
426 */
427#define list_for_each_prev(pos, head) \
428 for (pos = (head)->prev; pos != (head); pos = pos->prev)
429
430/**
431 * list_for_each_safe - iterate over a list safe against removal of list entry
432 * @pos: the &struct list_head to use as a loop cursor.
433 * @n: another &struct list_head to use as temporary storage
434 * @head: the head for your list.
435 */
436#define list_for_each_safe(pos, n, head) \
437 for (pos = (head)->next, n = pos->next; pos != (head); \
438 pos = n, n = pos->next)
439
440/**
441 * list_for_each_prev_safe - iterate over a list backwards safe against removal of list entry
442 * @pos: the &struct list_head to use as a loop cursor.
443 * @n: another &struct list_head to use as temporary storage
444 * @head: the head for your list.
445 */
446#define list_for_each_prev_safe(pos, n, head) \
447 for (pos = (head)->prev, n = pos->prev; \
448 pos != (head); \
449 pos = n, n = pos->prev)
450
451/**
452 * list_for_each_entry - iterate over list of given type
453 * @pos: the type * to use as a loop cursor.
454 * @head: the head for your list.
455 * @member: the name of the list_head within the struct.
456 */
457#define list_for_each_entry(pos, head, member) \
458 for (pos = list_first_entry(head, typeof(*pos), member); \
459 &pos->member != (head); \
460 pos = list_next_entry(pos, member))
461
462/**
463 * list_for_each_entry_reverse - iterate backwards over list of given type.
464 * @pos: the type * to use as a loop cursor.
465 * @head: the head for your list.
466 * @member: the name of the list_head within the struct.
467 */
468#define list_for_each_entry_reverse(pos, head, member) \
469 for (pos = list_last_entry(head, typeof(*pos), member); \
470 &pos->member != (head); \
471 pos = list_prev_entry(pos, member))
472
473/**
474 * list_prepare_entry - prepare a pos entry for use in list_for_each_entry_continue()
475 * @pos: the type * to use as a start point
476 * @head: the head of the list
477 * @member: the name of the list_head within the struct.
478 *
479 * Prepares a pos entry for use as a start point in list_for_each_entry_continue().
480 */
481#define list_prepare_entry(pos, head, member) \
482 ((pos) ? : list_entry(head, typeof(*pos), member))
483
484/**
485 * list_for_each_entry_continue - continue iteration over list of given type
486 * @pos: the type * to use as a loop cursor.
487 * @head: the head for your list.
488 * @member: the name of the list_head within the struct.
489 *
490 * Continue to iterate over list of given type, continuing after
491 * the current position.
492 */
493#define list_for_each_entry_continue(pos, head, member) \
494 for (pos = list_next_entry(pos, member); \
495 &pos->member != (head); \
496 pos = list_next_entry(pos, member))
497
498/**
499 * list_for_each_entry_continue_reverse - iterate backwards from the given point
500 * @pos: the type * to use as a loop cursor.
501 * @head: the head for your list.
502 * @member: the name of the list_head within the struct.
503 *
504 * Start to iterate over list of given type backwards, continuing after
505 * the current position.
506 */
507#define list_for_each_entry_continue_reverse(pos, head, member) \
508 for (pos = list_prev_entry(pos, member); \
509 &pos->member != (head); \
510 pos = list_prev_entry(pos, member))
511
512/**
513 * list_for_each_entry_from - iterate over list of given type from the current point
514 * @pos: the type * to use as a loop cursor.
515 * @head: the head for your list.
516 * @member: the name of the list_head within the struct.
517 *
518 * Iterate over list of given type, continuing from current position.
519 */
520#define list_for_each_entry_from(pos, head, member) \
521 for (; &pos->member != (head); \
522 pos = list_next_entry(pos, member))
523
524/**
525 * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry
526 * @pos: the type * to use as a loop cursor.
527 * @n: another type * to use as temporary storage
528 * @head: the head for your list.
529 * @member: the name of the list_head within the struct.
530 */
531#define list_for_each_entry_safe(pos, n, head, member) \
532 for (pos = list_first_entry(head, typeof(*pos), member), \
533 n = list_next_entry(pos, member); \
534 &pos->member != (head); \
535 pos = n, n = list_next_entry(n, member))
536
537/**
538 * list_for_each_entry_safe_continue - continue list iteration safe against removal
539 * @pos: the type * to use as a loop cursor.
540 * @n: another type * to use as temporary storage
541 * @head: the head for your list.
542 * @member: the name of the list_head within the struct.
543 *
544 * Iterate over list of given type, continuing after current point,
545 * safe against removal of list entry.
546 */
547#define list_for_each_entry_safe_continue(pos, n, head, member) \
548 for (pos = list_next_entry(pos, member), \
549 n = list_next_entry(pos, member); \
550 &pos->member != (head); \
551 pos = n, n = list_next_entry(n, member))
552
553/**
554 * list_for_each_entry_safe_from - iterate over list from current point safe against removal
555 * @pos: the type * to use as a loop cursor.
556 * @n: another type * to use as temporary storage
557 * @head: the head for your list.
558 * @member: the name of the list_head within the struct.
559 *
560 * Iterate over list of given type from current point, safe against
561 * removal of list entry.
562 */
563#define list_for_each_entry_safe_from(pos, n, head, member) \
564 for (n = list_next_entry(pos, member); \
565 &pos->member != (head); \
566 pos = n, n = list_next_entry(n, member))
567
568/**
569 * list_for_each_entry_safe_reverse - iterate backwards over list safe against removal
570 * @pos: the type * to use as a loop cursor.
571 * @n: another type * to use as temporary storage
572 * @head: the head for your list.
573 * @member: the name of the list_head within the struct.
574 *
575 * Iterate backwards over list of given type, safe against removal
576 * of list entry.
577 */
578#define list_for_each_entry_safe_reverse(pos, n, head, member) \
579 for (pos = list_last_entry(head, typeof(*pos), member), \
580 n = list_prev_entry(pos, member); \
581 &pos->member != (head); \
582 pos = n, n = list_prev_entry(n, member))
583
584/**
585 * list_safe_reset_next - reset a stale list_for_each_entry_safe loop
586 * @pos: the loop cursor used in the list_for_each_entry_safe loop
587 * @n: temporary storage used in list_for_each_entry_safe
588 * @member: the name of the list_head within the struct.
589 *
590 * list_safe_reset_next is not safe to use in general if the list may be
591 * modified concurrently (eg. the lock is dropped in the loop body). An
592 * exception to this is if the cursor element (pos) is pinned in the list,
593 * and list_safe_reset_next is called after re-taking the lock and before
594 * completing the current iteration of the loop body.
595 */
596#define list_safe_reset_next(pos, n, member) \
597 n = list_next_entry(pos, member)
598
599/*
600 * Double linked lists with a single pointer list head.
601 * Mostly useful for hash tables where the two pointer list head is
602 * too wasteful.
603 * You lose the ability to access the tail in O(1).
604 */
605
606#define HLIST_HEAD_INIT { .first = NULL }
607#define HLIST_HEAD(name) struct hlist_head name = { .first = NULL }
608#define INIT_HLIST_HEAD(ptr) ((ptr)->first = NULL)
609static inline void INIT_HLIST_NODE(struct hlist_node *h)
610{
611 h->next = NULL;
612 h->pprev = NULL;
613}
614
615static inline int hlist_unhashed(const struct hlist_node *h)
616{
617 return !h->pprev;
618}
619
620static inline int hlist_empty(const struct hlist_head *h)
621{
622 return !h->first;
623}
624
625static inline void __hlist_del(struct hlist_node *n)
626{
627 struct hlist_node *next = n->next;
628 struct hlist_node **pprev = n->pprev;
629
630 WRITE_ONCE(*pprev, next);
631 if (next)
632 next->pprev = pprev;
633}
634
635static inline void hlist_del(struct hlist_node *n)
636{
637 __hlist_del(n);
638 n->next = LIST_POISON1;
639 n->pprev = LIST_POISON2;
640}
641
642static inline void hlist_del_init(struct hlist_node *n)
643{
644 if (!hlist_unhashed(h: n)) {
645 __hlist_del(n);
646 INIT_HLIST_NODE(h: n);
647 }
648}
649
650static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h)
651{
652 struct hlist_node *first = h->first;
653 n->next = first;
654 if (first)
655 first->pprev = &n->next;
656 h->first = n;
657 n->pprev = &h->first;
658}
659
660/* next must be != NULL */
661static inline void hlist_add_before(struct hlist_node *n,
662 struct hlist_node *next)
663{
664 n->pprev = next->pprev;
665 n->next = next;
666 next->pprev = &n->next;
667 *(n->pprev) = n;
668}
669
670static inline void hlist_add_behind(struct hlist_node *n,
671 struct hlist_node *prev)
672{
673 n->next = prev->next;
674 prev->next = n;
675 n->pprev = &prev->next;
676
677 if (n->next)
678 n->next->pprev = &n->next;
679}
680
681/* after that we'll appear to be on some hlist and hlist_del will work */
682static inline void hlist_add_fake(struct hlist_node *n)
683{
684 n->pprev = &n->next;
685}
686
687static inline bool hlist_fake(struct hlist_node *h)
688{
689 return h->pprev == &h->next;
690}
691
692/*
693 * Move a list from one list head to another. Fixup the pprev
694 * reference of the first entry if it exists.
695 */
696static inline void hlist_move_list(struct hlist_head *old,
697 struct hlist_head *new)
698{
699 new->first = old->first;
700 if (new->first)
701 new->first->pprev = &new->first;
702 old->first = NULL;
703}
704
705#define hlist_entry(ptr, type, member) container_of(ptr,type,member)
706
707#define hlist_for_each(pos, head) \
708 for (pos = (head)->first; pos ; pos = pos->next)
709
710#define hlist_for_each_safe(pos, n, head) \
711 for (pos = (head)->first; pos && ({ n = pos->next; 1; }); \
712 pos = n)
713
714#define hlist_entry_safe(ptr, type, member) \
715 ({ typeof(ptr) ____ptr = (ptr); \
716 ____ptr ? hlist_entry(____ptr, type, member) : NULL; \
717 })
718
719/**
720 * hlist_for_each_entry - iterate over list of given type
721 * @pos: the type * to use as a loop cursor.
722 * @head: the head for your list.
723 * @member: the name of the hlist_node within the struct.
724 */
725#define hlist_for_each_entry(pos, head, member) \
726 for (pos = hlist_entry_safe((head)->first, typeof(*(pos)), member);\
727 pos; \
728 pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member))
729
730/**
731 * hlist_for_each_entry_continue - iterate over a hlist continuing after current point
732 * @pos: the type * to use as a loop cursor.
733 * @member: the name of the hlist_node within the struct.
734 */
735#define hlist_for_each_entry_continue(pos, member) \
736 for (pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member);\
737 pos; \
738 pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member))
739
740/**
741 * hlist_for_each_entry_from - iterate over a hlist continuing from current point
742 * @pos: the type * to use as a loop cursor.
743 * @member: the name of the hlist_node within the struct.
744 */
745#define hlist_for_each_entry_from(pos, member) \
746 for (; pos; \
747 pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member))
748
749/**
750 * hlist_for_each_entry_safe - iterate over list of given type safe against removal of list entry
751 * @pos: the type * to use as a loop cursor.
752 * @n: another &struct hlist_node to use as temporary storage
753 * @head: the head for your list.
754 * @member: the name of the hlist_node within the struct.
755 */
756#define hlist_for_each_entry_safe(pos, n, head, member) \
757 for (pos = hlist_entry_safe((head)->first, typeof(*pos), member);\
758 pos && ({ n = pos->member.next; 1; }); \
759 pos = hlist_entry_safe(n, typeof(*pos), member))
760
761/**
762 * list_del_range - deletes range of entries from list.
763 * @begin: first element in the range to delete from the list.
764 * @end: last element in the range to delete from the list.
765 * Note: list_empty on the range of entries does not return true after this,
766 * the entries is in an undefined state.
767 */
768static inline void list_del_range(struct list_head *begin,
769 struct list_head *end)
770{
771 begin->prev->next = end->next;
772 end->next->prev = begin->prev;
773}
774
775/**
776 * list_for_each_from - iterate over a list from one of its nodes
777 * @pos: the &struct list_head to use as a loop cursor, from where to start
778 * @head: the head for your list.
779 */
780#define list_for_each_from(pos, head) \
781 for (; pos != (head); pos = pos->next)
782
783#endif /* __TOOLS_LINUX_LIST_H */
784

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source code of linux/tools/include/linux/list.h