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700a0c64 WD |
1 | #ifndef _LINUX_LIST_H |
2 | #define _LINUX_LIST_H | |
3 | ||
ef0255fc JCPV |
4 | #include <linux/stddef.h> |
5 | #include <linux/poison.h> | |
6 | ||
700a0c64 WD |
7 | #ifndef ARCH_HAS_PREFETCH |
8 | #define ARCH_HAS_PREFETCH | |
9 | static inline void prefetch(const void *x) {;} | |
10 | #endif | |
11 | ||
12 | /* | |
13 | * Simple doubly linked list implementation. | |
14 | * | |
15 | * Some of the internal functions ("__xxx") are useful when | |
16 | * manipulating whole lists rather than single entries, as | |
17 | * sometimes we already know the next/prev entries and we can | |
18 | * generate better code by using them directly rather than | |
19 | * using the generic single-entry routines. | |
20 | */ | |
21 | ||
22 | struct list_head { | |
23 | struct list_head *next, *prev; | |
24 | }; | |
25 | ||
26 | #define LIST_HEAD_INIT(name) { &(name), &(name) } | |
27 | ||
28 | #define LIST_HEAD(name) \ | |
29 | struct list_head name = LIST_HEAD_INIT(name) | |
30 | ||
ef0255fc JCPV |
31 | static inline void INIT_LIST_HEAD(struct list_head *list) |
32 | { | |
33 | list->next = list; | |
34 | list->prev = list; | |
35 | } | |
700a0c64 WD |
36 | |
37 | /* | |
8f79e4c2 | 38 | * Insert a new entry between two known consecutive entries. |
700a0c64 WD |
39 | * |
40 | * This is only for internal list manipulation where we know | |
41 | * the prev/next entries already! | |
42 | */ | |
43 | static inline void __list_add(struct list_head *new, | |
44 | struct list_head *prev, | |
45 | struct list_head *next) | |
46 | { | |
47 | next->prev = new; | |
48 | new->next = next; | |
49 | new->prev = prev; | |
50 | prev->next = new; | |
51 | } | |
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 | * list_add_tail - add a new entry | |
68 | * @new: new entry to be added | |
69 | * @head: list head to add it before | |
70 | * | |
71 | * Insert a new entry before the specified head. | |
72 | * This is useful for implementing queues. | |
73 | */ | |
74 | static inline void list_add_tail(struct list_head *new, struct list_head *head) | |
75 | { | |
76 | __list_add(new, head->prev, head); | |
77 | } | |
78 | ||
79 | /* | |
80 | * Delete a list entry by making the prev/next entries | |
81 | * point to each other. | |
82 | * | |
83 | * This is only for internal list manipulation where we know | |
84 | * the prev/next entries already! | |
85 | */ | |
86 | static inline void __list_del(struct list_head *prev, struct list_head *next) | |
87 | { | |
88 | next->prev = prev; | |
89 | prev->next = next; | |
90 | } | |
91 | ||
92 | /** | |
93 | * list_del - deletes entry from list. | |
94 | * @entry: the element to delete from the list. | |
ef0255fc JCPV |
95 | * Note: list_empty() on entry does not return true after this, the entry is |
96 | * in an undefined state. | |
700a0c64 WD |
97 | */ |
98 | static inline void list_del(struct list_head *entry) | |
99 | { | |
100 | __list_del(entry->prev, entry->next); | |
ef0255fc JCPV |
101 | entry->next = LIST_POISON1; |
102 | entry->prev = LIST_POISON2; | |
103 | } | |
104 | ||
105 | /** | |
106 | * list_replace - replace old entry by new one | |
107 | * @old : the element to be replaced | |
108 | * @new : the new element to insert | |
109 | * | |
110 | * If @old was empty, it will be overwritten. | |
111 | */ | |
112 | static inline void list_replace(struct list_head *old, | |
113 | struct list_head *new) | |
114 | { | |
115 | new->next = old->next; | |
116 | new->next->prev = new; | |
117 | new->prev = old->prev; | |
118 | new->prev->next = new; | |
119 | } | |
120 | ||
121 | static inline void list_replace_init(struct list_head *old, | |
122 | struct list_head *new) | |
123 | { | |
124 | list_replace(old, new); | |
125 | INIT_LIST_HEAD(old); | |
700a0c64 WD |
126 | } |
127 | ||
128 | /** | |
129 | * list_del_init - deletes entry from list and reinitialize it. | |
130 | * @entry: the element to delete from the list. | |
131 | */ | |
132 | static inline void list_del_init(struct list_head *entry) | |
133 | { | |
134 | __list_del(entry->prev, entry->next); | |
8f79e4c2 | 135 | INIT_LIST_HEAD(entry); |
700a0c64 WD |
136 | } |
137 | ||
138 | /** | |
139 | * list_move - delete from one list and add as another's head | |
140 | * @list: the entry to move | |
141 | * @head: the head that will precede our entry | |
142 | */ | |
143 | static inline void list_move(struct list_head *list, struct list_head *head) | |
144 | { | |
8f79e4c2 WD |
145 | __list_del(list->prev, list->next); |
146 | list_add(list, head); | |
700a0c64 WD |
147 | } |
148 | ||
149 | /** | |
150 | * list_move_tail - delete from one list and add as another's tail | |
151 | * @list: the entry to move | |
152 | * @head: the head that will follow our entry | |
153 | */ | |
154 | static inline void list_move_tail(struct list_head *list, | |
155 | struct list_head *head) | |
156 | { | |
8f79e4c2 WD |
157 | __list_del(list->prev, list->next); |
158 | list_add_tail(list, head); | |
700a0c64 WD |
159 | } |
160 | ||
ef0255fc JCPV |
161 | /** |
162 | * list_is_last - tests whether @list is the last entry in list @head | |
163 | * @list: the entry to test | |
164 | * @head: the head of the list | |
165 | */ | |
166 | static inline int list_is_last(const struct list_head *list, | |
167 | const struct list_head *head) | |
168 | { | |
169 | return list->next == head; | |
170 | } | |
171 | ||
700a0c64 WD |
172 | /** |
173 | * list_empty - tests whether a list is empty | |
174 | * @head: the list to test. | |
175 | */ | |
ef0255fc | 176 | static inline int list_empty(const struct list_head *head) |
700a0c64 WD |
177 | { |
178 | return head->next == head; | |
179 | } | |
180 | ||
ef0255fc JCPV |
181 | /** |
182 | * list_empty_careful - tests whether a list is empty and not being modified | |
183 | * @head: the list to test | |
184 | * | |
185 | * Description: | |
186 | * tests whether a list is empty _and_ checks that no other CPU might be | |
187 | * in the process of modifying either member (next or prev) | |
188 | * | |
189 | * NOTE: using list_empty_careful() without synchronization | |
190 | * can only be safe if the only activity that can happen | |
191 | * to the list entry is list_del_init(). Eg. it cannot be used | |
192 | * if another CPU could re-list_add() it. | |
193 | */ | |
194 | static inline int list_empty_careful(const struct list_head *head) | |
195 | { | |
196 | struct list_head *next = head->next; | |
197 | return (next == head) && (next == head->prev); | |
198 | } | |
199 | ||
200 | /** | |
201 | * list_is_singular - tests whether a list has just one entry. | |
202 | * @head: the list to test. | |
203 | */ | |
204 | static inline int list_is_singular(const struct list_head *head) | |
205 | { | |
206 | return !list_empty(head) && (head->next == head->prev); | |
207 | } | |
208 | ||
209 | static inline void __list_cut_position(struct list_head *list, | |
210 | struct list_head *head, struct list_head *entry) | |
211 | { | |
212 | struct list_head *new_first = entry->next; | |
213 | list->next = head->next; | |
214 | list->next->prev = list; | |
215 | list->prev = entry; | |
216 | entry->next = list; | |
217 | head->next = new_first; | |
218 | new_first->prev = head; | |
219 | } | |
220 | ||
221 | /** | |
222 | * list_cut_position - cut a list into two | |
223 | * @list: a new list to add all removed entries | |
224 | * @head: a list with entries | |
225 | * @entry: an entry within head, could be the head itself | |
226 | * and if so we won't cut the list | |
227 | * | |
228 | * This helper moves the initial part of @head, up to and | |
229 | * including @entry, from @head to @list. You should | |
230 | * pass on @entry an element you know is on @head. @list | |
231 | * should be an empty list or a list you do not care about | |
232 | * losing its data. | |
233 | * | |
234 | */ | |
235 | static inline void list_cut_position(struct list_head *list, | |
236 | struct list_head *head, struct list_head *entry) | |
237 | { | |
238 | if (list_empty(head)) | |
239 | return; | |
240 | if (list_is_singular(head) && | |
241 | (head->next != entry && head != entry)) | |
242 | return; | |
243 | if (entry == head) | |
244 | INIT_LIST_HEAD(list); | |
245 | else | |
246 | __list_cut_position(list, head, entry); | |
247 | } | |
248 | ||
249 | static inline void __list_splice(const struct list_head *list, | |
250 | struct list_head *prev, | |
251 | struct list_head *next) | |
700a0c64 WD |
252 | { |
253 | struct list_head *first = list->next; | |
254 | struct list_head *last = list->prev; | |
700a0c64 | 255 | |
ef0255fc JCPV |
256 | first->prev = prev; |
257 | prev->next = first; | |
700a0c64 | 258 | |
ef0255fc JCPV |
259 | last->next = next; |
260 | next->prev = last; | |
700a0c64 WD |
261 | } |
262 | ||
263 | /** | |
ef0255fc | 264 | * list_splice - join two lists, this is designed for stacks |
700a0c64 WD |
265 | * @list: the new list to add. |
266 | * @head: the place to add it in the first list. | |
267 | */ | |
ef0255fc JCPV |
268 | static inline void list_splice(const struct list_head *list, |
269 | struct list_head *head) | |
700a0c64 WD |
270 | { |
271 | if (!list_empty(list)) | |
ef0255fc JCPV |
272 | __list_splice(list, head, head->next); |
273 | } | |
274 | ||
275 | /** | |
276 | * list_splice_tail - join two lists, each list being a queue | |
277 | * @list: the new list to add. | |
278 | * @head: the place to add it in the first list. | |
279 | */ | |
280 | static inline void list_splice_tail(struct list_head *list, | |
281 | struct list_head *head) | |
282 | { | |
283 | if (!list_empty(list)) | |
284 | __list_splice(list, head->prev, head); | |
700a0c64 WD |
285 | } |
286 | ||
287 | /** | |
288 | * list_splice_init - join two lists and reinitialise the emptied list. | |
289 | * @list: the new list to add. | |
290 | * @head: the place to add it in the first list. | |
291 | * | |
292 | * The list at @list is reinitialised | |
293 | */ | |
294 | static inline void list_splice_init(struct list_head *list, | |
295 | struct list_head *head) | |
296 | { | |
297 | if (!list_empty(list)) { | |
ef0255fc JCPV |
298 | __list_splice(list, head, head->next); |
299 | INIT_LIST_HEAD(list); | |
300 | } | |
301 | } | |
302 | ||
303 | /** | |
304 | * list_splice_tail_init - join two lists and reinitialise the emptied list | |
305 | * @list: the new list to add. | |
306 | * @head: the place to add it in the first list. | |
307 | * | |
308 | * Each of the lists is a queue. | |
309 | * The list at @list is reinitialised | |
310 | */ | |
311 | static inline void list_splice_tail_init(struct list_head *list, | |
312 | struct list_head *head) | |
313 | { | |
314 | if (!list_empty(list)) { | |
315 | __list_splice(list, head->prev, head); | |
700a0c64 WD |
316 | INIT_LIST_HEAD(list); |
317 | } | |
318 | } | |
319 | ||
320 | /** | |
321 | * list_entry - get the struct for this entry | |
322 | * @ptr: the &struct list_head pointer. | |
323 | * @type: the type of the struct this is embedded in. | |
324 | * @member: the name of the list_struct within the struct. | |
325 | */ | |
326 | #define list_entry(ptr, type, member) \ | |
ef0255fc JCPV |
327 | container_of(ptr, type, member) |
328 | ||
329 | /** | |
330 | * list_first_entry - get the first element from a list | |
331 | * @ptr: the list head to take the element from. | |
332 | * @type: the type of the struct this is embedded in. | |
333 | * @member: the name of the list_struct within the struct. | |
334 | * | |
335 | * Note, that list is expected to be not empty. | |
336 | */ | |
337 | #define list_first_entry(ptr, type, member) \ | |
338 | list_entry((ptr)->next, type, member) | |
700a0c64 | 339 | |
5023bd7a SG |
340 | /** |
341 | * list_last_entry - get the last element from a list | |
342 | * @ptr: the list head to take the element from. | |
343 | * @type: the type of the struct this is embedded in. | |
344 | * @member: the name of the list_struct within the struct. | |
345 | * | |
346 | * Note, that list is expected to be not empty. | |
347 | */ | |
348 | #define list_last_entry(ptr, type, member) \ | |
349 | list_entry((ptr)->prev, type, member) | |
350 | ||
700a0c64 WD |
351 | /** |
352 | * list_for_each - iterate over a list | |
ef0255fc | 353 | * @pos: the &struct list_head to use as a loop cursor. |
700a0c64 WD |
354 | * @head: the head for your list. |
355 | */ | |
356 | #define list_for_each(pos, head) \ | |
ef0255fc | 357 | for (pos = (head)->next; prefetch(pos->next), pos != (head); \ |
f12e4549 | 358 | pos = pos->next) |
ef0255fc JCPV |
359 | |
360 | /** | |
361 | * __list_for_each - iterate over a list | |
362 | * @pos: the &struct list_head to use as a loop cursor. | |
363 | * @head: the head for your list. | |
364 | * | |
365 | * This variant differs from list_for_each() in that it's the | |
366 | * simplest possible list iteration code, no prefetching is done. | |
367 | * Use this for code that knows the list to be very short (empty | |
368 | * or 1 entry) most of the time. | |
369 | */ | |
370 | #define __list_for_each(pos, head) \ | |
371 | for (pos = (head)->next; pos != (head); pos = pos->next) | |
372 | ||
700a0c64 WD |
373 | /** |
374 | * list_for_each_prev - iterate over a list backwards | |
ef0255fc | 375 | * @pos: the &struct list_head to use as a loop cursor. |
700a0c64 WD |
376 | * @head: the head for your list. |
377 | */ | |
378 | #define list_for_each_prev(pos, head) \ | |
ef0255fc | 379 | for (pos = (head)->prev; prefetch(pos->prev), pos != (head); \ |
f12e4549 | 380 | pos = pos->prev) |
8f79e4c2 | 381 | |
700a0c64 | 382 | /** |
ef0255fc JCPV |
383 | * list_for_each_safe - iterate over a list safe against removal of list entry |
384 | * @pos: the &struct list_head to use as a loop cursor. | |
700a0c64 WD |
385 | * @n: another &struct list_head to use as temporary storage |
386 | * @head: the head for your list. | |
387 | */ | |
388 | #define list_for_each_safe(pos, n, head) \ | |
389 | for (pos = (head)->next, n = pos->next; pos != (head); \ | |
390 | pos = n, n = pos->next) | |
391 | ||
ef0255fc JCPV |
392 | /** |
393 | * list_for_each_prev_safe - iterate over a list backwards safe against removal of list entry | |
394 | * @pos: the &struct list_head to use as a loop cursor. | |
395 | * @n: another &struct list_head to use as temporary storage | |
396 | * @head: the head for your list. | |
397 | */ | |
398 | #define list_for_each_prev_safe(pos, n, head) \ | |
399 | for (pos = (head)->prev, n = pos->prev; \ | |
400 | prefetch(pos->prev), pos != (head); \ | |
401 | pos = n, n = pos->prev) | |
402 | ||
700a0c64 WD |
403 | /** |
404 | * list_for_each_entry - iterate over list of given type | |
ef0255fc | 405 | * @pos: the type * to use as a loop cursor. |
700a0c64 WD |
406 | * @head: the head for your list. |
407 | * @member: the name of the list_struct within the struct. | |
408 | */ | |
409 | #define list_for_each_entry(pos, head, member) \ | |
ef0255fc | 410 | for (pos = list_entry((head)->next, typeof(*pos), member); \ |
f12e4549 | 411 | prefetch(pos->member.next), &pos->member != (head); \ |
ef0255fc JCPV |
412 | pos = list_entry(pos->member.next, typeof(*pos), member)) |
413 | ||
414 | /** | |
415 | * list_for_each_entry_reverse - iterate backwards over list of given type. | |
416 | * @pos: the type * to use as a loop cursor. | |
417 | * @head: the head for your list. | |
418 | * @member: the name of the list_struct within the struct. | |
419 | */ | |
420 | #define list_for_each_entry_reverse(pos, head, member) \ | |
421 | for (pos = list_entry((head)->prev, typeof(*pos), member); \ | |
f12e4549 | 422 | prefetch(pos->member.prev), &pos->member != (head); \ |
ef0255fc JCPV |
423 | pos = list_entry(pos->member.prev, typeof(*pos), member)) |
424 | ||
425 | /** | |
426 | * list_prepare_entry - prepare a pos entry for use in list_for_each_entry_continue() | |
427 | * @pos: the type * to use as a start point | |
428 | * @head: the head of the list | |
429 | * @member: the name of the list_struct within the struct. | |
430 | * | |
431 | * Prepares a pos entry for use as a start point in list_for_each_entry_continue(). | |
432 | */ | |
433 | #define list_prepare_entry(pos, head, member) \ | |
434 | ((pos) ? : list_entry(head, typeof(*pos), member)) | |
435 | ||
436 | /** | |
437 | * list_for_each_entry_continue - continue iteration over list of given type | |
438 | * @pos: the type * to use as a loop cursor. | |
439 | * @head: the head for your list. | |
440 | * @member: the name of the list_struct within the struct. | |
441 | * | |
442 | * Continue to iterate over list of given type, continuing after | |
443 | * the current position. | |
444 | */ | |
445 | #define list_for_each_entry_continue(pos, head, member) \ | |
446 | for (pos = list_entry(pos->member.next, typeof(*pos), member); \ | |
447 | prefetch(pos->member.next), &pos->member != (head); \ | |
448 | pos = list_entry(pos->member.next, typeof(*pos), member)) | |
449 | ||
450 | /** | |
451 | * list_for_each_entry_continue_reverse - iterate backwards from the given point | |
452 | * @pos: the type * to use as a loop cursor. | |
453 | * @head: the head for your list. | |
454 | * @member: the name of the list_struct within the struct. | |
455 | * | |
456 | * Start to iterate over list of given type backwards, continuing after | |
457 | * the current position. | |
458 | */ | |
459 | #define list_for_each_entry_continue_reverse(pos, head, member) \ | |
460 | for (pos = list_entry(pos->member.prev, typeof(*pos), member); \ | |
461 | prefetch(pos->member.prev), &pos->member != (head); \ | |
462 | pos = list_entry(pos->member.prev, typeof(*pos), member)) | |
463 | ||
464 | /** | |
465 | * list_for_each_entry_from - iterate over list of given type from the current point | |
466 | * @pos: the type * to use as a loop cursor. | |
467 | * @head: the head for your list. | |
468 | * @member: the name of the list_struct within the struct. | |
469 | * | |
470 | * Iterate over list of given type, continuing from current position. | |
471 | */ | |
f12e4549 | 472 | #define list_for_each_entry_from(pos, head, member) \ |
ef0255fc JCPV |
473 | for (; prefetch(pos->member.next), &pos->member != (head); \ |
474 | pos = list_entry(pos->member.next, typeof(*pos), member)) | |
700a0c64 WD |
475 | |
476 | /** | |
477 | * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry | |
ef0255fc | 478 | * @pos: the type * to use as a loop cursor. |
700a0c64 WD |
479 | * @n: another type * to use as temporary storage |
480 | * @head: the head for your list. | |
481 | * @member: the name of the list_struct within the struct. | |
482 | */ | |
483 | #define list_for_each_entry_safe(pos, n, head, member) \ | |
484 | for (pos = list_entry((head)->next, typeof(*pos), member), \ | |
ef0255fc | 485 | n = list_entry(pos->member.next, typeof(*pos), member); \ |
f12e4549 | 486 | &pos->member != (head); \ |
700a0c64 WD |
487 | pos = n, n = list_entry(n->member.next, typeof(*n), member)) |
488 | ||
489 | /** | |
ef0255fc JCPV |
490 | * list_for_each_entry_safe_continue |
491 | * @pos: the type * to use as a loop cursor. | |
492 | * @n: another type * to use as temporary storage | |
8f79e4c2 WD |
493 | * @head: the head for your list. |
494 | * @member: the name of the list_struct within the struct. | |
ef0255fc JCPV |
495 | * |
496 | * Iterate over list of given type, continuing after current point, | |
497 | * safe against removal of list entry. | |
498 | */ | |
499 | #define list_for_each_entry_safe_continue(pos, n, head, member) \ | |
f12e4549 | 500 | for (pos = list_entry(pos->member.next, typeof(*pos), member), \ |
ef0255fc JCPV |
501 | n = list_entry(pos->member.next, typeof(*pos), member); \ |
502 | &pos->member != (head); \ | |
503 | pos = n, n = list_entry(n->member.next, typeof(*n), member)) | |
504 | ||
505 | /** | |
506 | * list_for_each_entry_safe_from | |
507 | * @pos: the type * to use as a loop cursor. | |
508 | * @n: another type * to use as temporary storage | |
509 | * @head: the head for your list. | |
510 | * @member: the name of the list_struct within the struct. | |
511 | * | |
512 | * Iterate over list of given type from current point, safe against | |
513 | * removal of list entry. | |
514 | */ | |
f12e4549 | 515 | #define list_for_each_entry_safe_from(pos, n, head, member) \ |
ef0255fc JCPV |
516 | for (n = list_entry(pos->member.next, typeof(*pos), member); \ |
517 | &pos->member != (head); \ | |
518 | pos = n, n = list_entry(n->member.next, typeof(*n), member)) | |
519 | ||
520 | /** | |
521 | * list_for_each_entry_safe_reverse | |
522 | * @pos: the type * to use as a loop cursor. | |
523 | * @n: another type * to use as temporary storage | |
524 | * @head: the head for your list. | |
525 | * @member: the name of the list_struct within the struct. | |
526 | * | |
527 | * Iterate backwards over list of given type, safe against removal | |
528 | * of list entry. | |
529 | */ | |
530 | #define list_for_each_entry_safe_reverse(pos, n, head, member) \ | |
531 | for (pos = list_entry((head)->prev, typeof(*pos), member), \ | |
532 | n = list_entry(pos->member.prev, typeof(*pos), member); \ | |
f12e4549 | 533 | &pos->member != (head); \ |
ef0255fc JCPV |
534 | pos = n, n = list_entry(n->member.prev, typeof(*n), member)) |
535 | ||
536 | /* | |
537 | * Double linked lists with a single pointer list head. | |
538 | * Mostly useful for hash tables where the two pointer list head is | |
539 | * too wasteful. | |
540 | * You lose the ability to access the tail in O(1). | |
541 | */ | |
542 | ||
543 | struct hlist_head { | |
544 | struct hlist_node *first; | |
545 | }; | |
546 | ||
547 | struct hlist_node { | |
548 | struct hlist_node *next, **pprev; | |
549 | }; | |
550 | ||
551 | #define HLIST_HEAD_INIT { .first = NULL } | |
552 | #define HLIST_HEAD(name) struct hlist_head name = { .first = NULL } | |
553 | #define INIT_HLIST_HEAD(ptr) ((ptr)->first = NULL) | |
554 | static inline void INIT_HLIST_NODE(struct hlist_node *h) | |
555 | { | |
556 | h->next = NULL; | |
557 | h->pprev = NULL; | |
558 | } | |
559 | ||
560 | static inline int hlist_unhashed(const struct hlist_node *h) | |
561 | { | |
562 | return !h->pprev; | |
563 | } | |
564 | ||
565 | static inline int hlist_empty(const struct hlist_head *h) | |
566 | { | |
567 | return !h->first; | |
568 | } | |
569 | ||
570 | static inline void __hlist_del(struct hlist_node *n) | |
571 | { | |
572 | struct hlist_node *next = n->next; | |
573 | struct hlist_node **pprev = n->pprev; | |
574 | *pprev = next; | |
575 | if (next) | |
576 | next->pprev = pprev; | |
577 | } | |
578 | ||
579 | static inline void hlist_del(struct hlist_node *n) | |
580 | { | |
581 | __hlist_del(n); | |
582 | n->next = LIST_POISON1; | |
583 | n->pprev = LIST_POISON2; | |
584 | } | |
585 | ||
586 | static inline void hlist_del_init(struct hlist_node *n) | |
587 | { | |
588 | if (!hlist_unhashed(n)) { | |
589 | __hlist_del(n); | |
590 | INIT_HLIST_NODE(n); | |
591 | } | |
592 | } | |
593 | ||
594 | static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h) | |
595 | { | |
596 | struct hlist_node *first = h->first; | |
597 | n->next = first; | |
598 | if (first) | |
599 | first->pprev = &n->next; | |
600 | h->first = n; | |
601 | n->pprev = &h->first; | |
602 | } | |
603 | ||
604 | /* next must be != NULL */ | |
605 | static inline void hlist_add_before(struct hlist_node *n, | |
606 | struct hlist_node *next) | |
607 | { | |
608 | n->pprev = next->pprev; | |
609 | n->next = next; | |
610 | next->pprev = &n->next; | |
611 | *(n->pprev) = n; | |
612 | } | |
613 | ||
614 | static inline void hlist_add_after(struct hlist_node *n, | |
615 | struct hlist_node *next) | |
616 | { | |
617 | next->next = n->next; | |
618 | n->next = next; | |
619 | next->pprev = &n->next; | |
620 | ||
621 | if(next->next) | |
622 | next->next->pprev = &next->next; | |
623 | } | |
624 | ||
625 | #define hlist_entry(ptr, type, member) container_of(ptr,type,member) | |
626 | ||
627 | #define hlist_for_each(pos, head) \ | |
628 | for (pos = (head)->first; pos && ({ prefetch(pos->next); 1; }); \ | |
629 | pos = pos->next) | |
630 | ||
631 | #define hlist_for_each_safe(pos, n, head) \ | |
632 | for (pos = (head)->first; pos && ({ n = pos->next; 1; }); \ | |
633 | pos = n) | |
634 | ||
635 | /** | |
636 | * hlist_for_each_entry - iterate over list of given type | |
637 | * @tpos: the type * to use as a loop cursor. | |
638 | * @pos: the &struct hlist_node to use as a loop cursor. | |
639 | * @head: the head for your list. | |
640 | * @member: the name of the hlist_node within the struct. | |
641 | */ | |
642 | #define hlist_for_each_entry(tpos, pos, head, member) \ | |
643 | for (pos = (head)->first; \ | |
644 | pos && ({ prefetch(pos->next); 1;}) && \ | |
645 | ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \ | |
646 | pos = pos->next) | |
647 | ||
648 | /** | |
649 | * hlist_for_each_entry_continue - iterate over a hlist continuing after current point | |
650 | * @tpos: the type * to use as a loop cursor. | |
651 | * @pos: the &struct hlist_node to use as a loop cursor. | |
652 | * @member: the name of the hlist_node within the struct. | |
653 | */ | |
654 | #define hlist_for_each_entry_continue(tpos, pos, member) \ | |
655 | for (pos = (pos)->next; \ | |
656 | pos && ({ prefetch(pos->next); 1;}) && \ | |
657 | ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \ | |
658 | pos = pos->next) | |
659 | ||
660 | /** | |
661 | * hlist_for_each_entry_from - iterate over a hlist continuing from current point | |
662 | * @tpos: the type * to use as a loop cursor. | |
663 | * @pos: the &struct hlist_node to use as a loop cursor. | |
664 | * @member: the name of the hlist_node within the struct. | |
665 | */ | |
666 | #define hlist_for_each_entry_from(tpos, pos, member) \ | |
667 | for (; pos && ({ prefetch(pos->next); 1;}) && \ | |
668 | ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \ | |
669 | pos = pos->next) | |
670 | ||
671 | /** | |
672 | * hlist_for_each_entry_safe - iterate over list of given type safe against removal of list entry | |
673 | * @tpos: the type * to use as a loop cursor. | |
674 | * @pos: the &struct hlist_node to use as a loop cursor. | |
675 | * @n: another &struct hlist_node to use as temporary storage | |
676 | * @head: the head for your list. | |
677 | * @member: the name of the hlist_node within the struct. | |
700a0c64 | 678 | */ |
f12e4549 | 679 | #define hlist_for_each_entry_safe(tpos, pos, n, head, member) \ |
ef0255fc | 680 | for (pos = (head)->first; \ |
f12e4549 | 681 | pos && ({ n = pos->next; 1; }) && \ |
ef0255fc JCPV |
682 | ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \ |
683 | pos = n) | |
700a0c64 WD |
684 | |
685 | #endif |