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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
d1b39d41 JP |
2 | #ifndef __TOOLS_LINUX_LIST_H |
3 | #define __TOOLS_LINUX_LIST_H | |
4 | ||
d944c4ee | 5 | #include <linux/types.h> |
d1b39d41 JP |
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 | ||
25 | static 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 | |
38 | static 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 | |
48 | extern 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 | */ | |
61 | static inline void list_add(struct list_head *new, struct list_head *head) | |
62 | { | |
63 | __list_add(new, head, 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 | */ | |
75 | static inline void list_add_tail(struct list_head *new, struct list_head *head) | |
76 | { | |
77 | __list_add(new, head->prev, 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 | */ | |
87 | static 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 | |
100 | static inline void __list_del_entry(struct list_head *entry) | |
101 | { | |
102 | __list_del(entry->prev, entry->next); | |
103 | } | |
104 | ||
105 | static 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 | |
112 | extern void __list_del_entry(struct list_head *entry); | |
113 | extern 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 | */ | |
123 | static 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 | ||
132 | static 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 | * list_del_init - deletes entry from list and reinitialize it. | |
141 | * @entry: the element to delete from the list. | |
142 | */ | |
143 | static inline void list_del_init(struct list_head *entry) | |
144 | { | |
145 | __list_del_entry(entry); | |
146 | INIT_LIST_HEAD(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 | */ | |
154 | static 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 | * 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 | */ | |
165 | static 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 | /** | |
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 | */ | |
177 | static 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 | */ | |
187 | static 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 | */ | |
205 | static 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 | */ | |
215 | static 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 | * list_is_singular - tests whether a list has just one entry. | |
227 | * @head: the list to test. | |
228 | */ | |
229 | static inline int list_is_singular(const struct list_head *head) | |
230 | { | |
231 | return !list_empty(head) && (head->next == head->prev); | |
232 | } | |
233 | ||
234 | static 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 | */ | |
260 | static 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 | ||
274 | static 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 | */ | |
293 | static 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 | /** | |
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 | */ | |
305 | static 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 | ||
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 | */ | |
319 | static 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 | ||
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 | */ | |
336 | static 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 | ||
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_next_entry - get the next element in list | |
389 | * @pos: the type * to cursor | |
390 | * @member: the name of the list_head within the struct. | |
391 | */ | |
392 | #define list_next_entry(pos, member) \ | |
393 | list_entry((pos)->member.next, typeof(*(pos)), member) | |
394 | ||
395 | /** | |
396 | * list_prev_entry - get the prev element in list | |
397 | * @pos: the type * to cursor | |
398 | * @member: the name of the list_head within the struct. | |
399 | */ | |
400 | #define list_prev_entry(pos, member) \ | |
401 | list_entry((pos)->member.prev, typeof(*(pos)), member) | |
402 | ||
403 | /** | |
404 | * list_for_each - iterate over a list | |
405 | * @pos: the &struct list_head to use as a loop cursor. | |
406 | * @head: the head for your list. | |
407 | */ | |
408 | #define list_for_each(pos, head) \ | |
409 | for (pos = (head)->next; pos != (head); pos = pos->next) | |
410 | ||
411 | /** | |
412 | * list_for_each_prev - iterate over a list backwards | |
413 | * @pos: the &struct list_head to use as a loop cursor. | |
414 | * @head: the head for your list. | |
415 | */ | |
416 | #define list_for_each_prev(pos, head) \ | |
417 | for (pos = (head)->prev; pos != (head); pos = pos->prev) | |
418 | ||
419 | /** | |
420 | * list_for_each_safe - iterate over a list safe against removal of list entry | |
421 | * @pos: the &struct list_head to use as a loop cursor. | |
422 | * @n: another &struct list_head to use as temporary storage | |
423 | * @head: the head for your list. | |
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) | |
428 | ||
429 | /** | |
430 | * list_for_each_prev_safe - iterate over a list backwards safe against removal of list entry | |
431 | * @pos: the &struct list_head to use as a loop cursor. | |
432 | * @n: another &struct list_head to use as temporary storage | |
433 | * @head: the head for your list. | |
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) | |
439 | ||
440 | /** | |
441 | * list_for_each_entry - iterate over list of given type | |
442 | * @pos: the type * to use as a loop cursor. | |
443 | * @head: the head for your list. | |
444 | * @member: the name of the list_head within the struct. | |
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 | ||
451 | /** | |
452 | * list_for_each_entry_reverse - iterate backwards 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_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 | ||
462 | /** | |
463 | * list_prepare_entry - prepare a pos entry for use in list_for_each_entry_continue() | |
464 | * @pos: the type * to use as a start point | |
465 | * @head: the head of the list | |
466 | * @member: the name of the list_head within the struct. | |
467 | * | |
468 | * Prepares a pos entry for use as a start point in list_for_each_entry_continue(). | |
469 | */ | |
470 | #define list_prepare_entry(pos, head, member) \ | |
471 | ((pos) ? : list_entry(head, typeof(*pos), member)) | |
472 | ||
473 | /** | |
474 | * list_for_each_entry_continue - continue iteration over list of given type | |
475 | * @pos: the type * to use as a loop cursor. | |
476 | * @head: the head for your list. | |
477 | * @member: the name of the list_head within the struct. | |
478 | * | |
479 | * Continue to iterate over list of given type, continuing after | |
480 | * the current position. | |
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)) | |
486 | ||
487 | /** | |
488 | * list_for_each_entry_continue_reverse - iterate backwards from the given point | |
489 | * @pos: the type * to use as a loop cursor. | |
490 | * @head: the head for your list. | |
491 | * @member: the name of the list_head within the struct. | |
492 | * | |
493 | * Start to iterate over list of given type backwards, continuing after | |
494 | * the current position. | |
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 | ||
501 | /** | |
502 | * list_for_each_entry_from - iterate over list of given type from the current point | |
503 | * @pos: the type * to use as a loop cursor. | |
504 | * @head: the head for your list. | |
505 | * @member: the name of the list_head within the struct. | |
506 | * | |
507 | * Iterate over list of given type, continuing from current position. | |
508 | */ | |
509 | #define list_for_each_entry_from(pos, head, member) \ | |
510 | for (; &pos->member != (head); \ | |
511 | pos = list_next_entry(pos, member)) | |
512 | ||
513 | /** | |
514 | * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry | |
515 | * @pos: the type * to use as a loop cursor. | |
516 | * @n: another type * to use as temporary storage | |
517 | * @head: the head for your list. | |
518 | * @member: the name of the list_head within the struct. | |
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)) | |
525 | ||
526 | /** | |
527 | * list_for_each_entry_safe_continue - continue list iteration safe against removal | |
528 | * @pos: the type * to use as a loop cursor. | |
529 | * @n: another type * to use as temporary storage | |
530 | * @head: the head for your list. | |
531 | * @member: the name of the list_head within the struct. | |
532 | * | |
533 | * Iterate over list of given type, continuing after current point, | |
534 | * safe against removal of list entry. | |
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)) | |
541 | ||
542 | /** | |
543 | * list_for_each_entry_safe_from - iterate over list from current point safe against removal | |
544 | * @pos: the type * to use as a loop cursor. | |
545 | * @n: another type * to use as temporary storage | |
546 | * @head: the head for your list. | |
547 | * @member: the name of the list_head within the struct. | |
548 | * | |
549 | * Iterate over list of given type from current point, safe against | |
550 | * removal of list entry. | |
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)) | |
556 | ||
557 | /** | |
558 | * list_for_each_entry_safe_reverse - iterate backwards over list safe against removal | |
559 | * @pos: the type * to use as a loop cursor. | |
560 | * @n: another type * to use as temporary storage | |
561 | * @head: the head for your list. | |
562 | * @member: the name of the list_head within the struct. | |
563 | * | |
564 | * Iterate backwards over list of given type, safe against removal | |
565 | * of list entry. | |
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)) | |
3ac1bbcf | 572 | |
d1b39d41 JP |
573 | /** |
574 | * list_safe_reset_next - reset a stale list_for_each_entry_safe loop | |
575 | * @pos: the loop cursor used in the list_for_each_entry_safe loop | |
576 | * @n: temporary storage used in list_for_each_entry_safe | |
577 | * @member: the name of the list_head within the struct. | |
578 | * | |
579 | * list_safe_reset_next is not safe to use in general if the list may be | |
580 | * modified concurrently (eg. the lock is dropped in the loop body). An | |
581 | * exception to this is if the cursor element (pos) is pinned in the list, | |
582 | * and list_safe_reset_next is called after re-taking the lock and before | |
583 | * completing the current iteration of the loop body. | |
584 | */ | |
585 | #define list_safe_reset_next(pos, n, member) \ | |
586 | n = list_next_entry(pos, member) | |
587 | ||
588 | /* | |
589 | * Double linked lists with a single pointer list head. | |
590 | * Mostly useful for hash tables where the two pointer list head is | |
591 | * too wasteful. | |
592 | * You lose the ability to access the tail in O(1). | |
593 | */ | |
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) | |
598 | static inline void INIT_HLIST_NODE(struct hlist_node *h) | |
599 | { | |
600 | h->next = NULL; | |
601 | h->pprev = NULL; | |
602 | } | |
603 | ||
604 | static inline int hlist_unhashed(const struct hlist_node *h) | |
605 | { | |
606 | return !h->pprev; | |
607 | } | |
608 | ||
609 | static inline int hlist_empty(const struct hlist_head *h) | |
610 | { | |
611 | return !h->first; | |
612 | } | |
613 | ||
614 | static inline void __hlist_del(struct hlist_node *n) | |
615 | { | |
616 | struct hlist_node *next = n->next; | |
617 | struct hlist_node **pprev = n->pprev; | |
618 | ||
619 | WRITE_ONCE(*pprev, next); | |
620 | if (next) | |
621 | next->pprev = pprev; | |
622 | } | |
623 | ||
624 | static inline void hlist_del(struct hlist_node *n) | |
625 | { | |
626 | __hlist_del(n); | |
627 | n->next = LIST_POISON1; | |
628 | n->pprev = LIST_POISON2; | |
629 | } | |
630 | ||
631 | static inline void hlist_del_init(struct hlist_node *n) | |
632 | { | |
633 | if (!hlist_unhashed(n)) { | |
634 | __hlist_del(n); | |
635 | INIT_HLIST_NODE(n); | |
636 | } | |
637 | } | |
638 | ||
639 | static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h) | |
640 | { | |
641 | struct hlist_node *first = h->first; | |
642 | n->next = first; | |
643 | if (first) | |
644 | first->pprev = &n->next; | |
645 | h->first = n; | |
646 | n->pprev = &h->first; | |
647 | } | |
648 | ||
649 | /* next must be != NULL */ | |
650 | static inline void hlist_add_before(struct hlist_node *n, | |
651 | struct hlist_node *next) | |
652 | { | |
653 | n->pprev = next->pprev; | |
654 | n->next = next; | |
655 | next->pprev = &n->next; | |
656 | *(n->pprev) = n; | |
657 | } | |
658 | ||
659 | static inline void hlist_add_behind(struct hlist_node *n, | |
660 | struct hlist_node *prev) | |
661 | { | |
662 | n->next = prev->next; | |
663 | prev->next = n; | |
664 | n->pprev = &prev->next; | |
665 | ||
666 | if (n->next) | |
667 | n->next->pprev = &n->next; | |
668 | } | |
669 | ||
670 | /* after that we'll appear to be on some hlist and hlist_del will work */ | |
671 | static inline void hlist_add_fake(struct hlist_node *n) | |
672 | { | |
673 | n->pprev = &n->next; | |
674 | } | |
675 | ||
676 | static inline bool hlist_fake(struct hlist_node *h) | |
677 | { | |
678 | return h->pprev == &h->next; | |
679 | } | |
680 | ||
681 | /* | |
682 | * Move a list from one list head to another. Fixup the pprev | |
683 | * reference of the first entry if it exists. | |
684 | */ | |
685 | static inline void hlist_move_list(struct hlist_head *old, | |
686 | struct hlist_head *new) | |
687 | { | |
688 | new->first = old->first; | |
689 | if (new->first) | |
690 | new->first->pprev = &new->first; | |
691 | old->first = NULL; | |
692 | } | |
693 | ||
694 | #define hlist_entry(ptr, type, member) container_of(ptr,type,member) | |
695 | ||
696 | #define hlist_for_each(pos, head) \ | |
697 | for (pos = (head)->first; pos ; pos = pos->next) | |
698 | ||
699 | #define hlist_for_each_safe(pos, n, head) \ | |
700 | for (pos = (head)->first; pos && ({ n = pos->next; 1; }); \ | |
701 | pos = n) | |
702 | ||
703 | #define hlist_entry_safe(ptr, type, member) \ | |
704 | ({ typeof(ptr) ____ptr = (ptr); \ | |
705 | ____ptr ? hlist_entry(____ptr, type, member) : NULL; \ | |
706 | }) | |
707 | ||
708 | /** | |
709 | * hlist_for_each_entry - iterate over list of given type | |
710 | * @pos: the type * to use as a loop cursor. | |
711 | * @head: the head for your list. | |
712 | * @member: the name of the hlist_node within the struct. | |
713 | */ | |
714 | #define hlist_for_each_entry(pos, head, member) \ | |
715 | for (pos = hlist_entry_safe((head)->first, typeof(*(pos)), member);\ | |
716 | pos; \ | |
717 | pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member)) | |
718 | ||
719 | /** | |
720 | * hlist_for_each_entry_continue - iterate over a hlist continuing after current point | |
721 | * @pos: the type * to use as a loop cursor. | |
722 | * @member: the name of the hlist_node within the struct. | |
723 | */ | |
724 | #define hlist_for_each_entry_continue(pos, member) \ | |
725 | for (pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member);\ | |
726 | pos; \ | |
727 | pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member)) | |
728 | ||
729 | /** | |
730 | * hlist_for_each_entry_from - iterate over a hlist continuing from current point | |
731 | * @pos: the type * to use as a loop cursor. | |
732 | * @member: the name of the hlist_node within the struct. | |
733 | */ | |
734 | #define hlist_for_each_entry_from(pos, member) \ | |
735 | for (; pos; \ | |
736 | pos = hlist_entry_safe((pos)->member.next, typeof(*(pos)), member)) | |
737 | ||
738 | /** | |
739 | * hlist_for_each_entry_safe - iterate over list of given type safe against removal of list entry | |
740 | * @pos: the type * to use as a loop cursor. | |
741 | * @n: another &struct hlist_node to use as temporary storage | |
742 | * @head: the head for your list. | |
743 | * @member: the name of the hlist_node within the struct. | |
744 | */ | |
745 | #define hlist_for_each_entry_safe(pos, n, head, member) \ | |
746 | for (pos = hlist_entry_safe((head)->first, typeof(*pos), member);\ | |
747 | pos && ({ n = pos->member.next; 1; }); \ | |
748 | pos = hlist_entry_safe(n, typeof(*pos), member)) | |
5da50258 | 749 | |
5da50258 ACM |
750 | /** |
751 | * list_del_range - deletes range of entries from list. | |
752 | * @begin: first element in the range to delete from the list. | |
753 | * @end: last element in the range to delete from the list. | |
754 | * Note: list_empty on the range of entries does not return true after this, | |
755 | * the entries is in an undefined state. | |
756 | */ | |
757 | static inline void list_del_range(struct list_head *begin, | |
758 | struct list_head *end) | |
759 | { | |
760 | begin->prev->next = end->next; | |
761 | end->next->prev = begin->prev; | |
762 | } | |
43730982 ACM |
763 | |
764 | /** | |
765 | * list_for_each_from - iterate over a list from one of its nodes | |
766 | * @pos: the &struct list_head to use as a loop cursor, from where to start | |
767 | * @head: the head for your list. | |
768 | */ | |
769 | #define list_for_each_from(pos, head) \ | |
268bb0ce | 770 | for (; pos != (head); pos = pos->next) |
d1b39d41 JP |
771 | |
772 | #endif /* __TOOLS_LINUX_LIST_H */ |