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fe9d4f57 AD |
1 | #include <linux/kdebug.h> |
2 | #include <linux/kprobes.h> | |
9984de1a | 3 | #include <linux/export.h> |
fe9d4f57 AD |
4 | #include <linux/notifier.h> |
5 | #include <linux/rcupdate.h> | |
6 | #include <linux/vmalloc.h> | |
c166f23c | 7 | #include <linux/reboot.h> |
1cac41cb MB |
8 | #include <linux/suspend.h> |
9 | #include <linux/exynos-ss.h> | |
fe9d4f57 AD |
10 | |
11 | /* | |
12 | * Notifier list for kernel code which wants to be called | |
13 | * at shutdown. This is used to stop any idling DMA operations | |
14 | * and the like. | |
15 | */ | |
16 | BLOCKING_NOTIFIER_HEAD(reboot_notifier_list); | |
17 | ||
18 | /* | |
19 | * Notifier chain core routines. The exported routines below | |
20 | * are layered on top of these, with appropriate locking added. | |
21 | */ | |
22 | ||
23 | static int notifier_chain_register(struct notifier_block **nl, | |
24 | struct notifier_block *n) | |
25 | { | |
26 | while ((*nl) != NULL) { | |
27 | if (n->priority > (*nl)->priority) | |
28 | break; | |
29 | nl = &((*nl)->next); | |
30 | } | |
31 | n->next = *nl; | |
32 | rcu_assign_pointer(*nl, n); | |
33 | return 0; | |
34 | } | |
35 | ||
6546bc42 ND |
36 | static int notifier_chain_cond_register(struct notifier_block **nl, |
37 | struct notifier_block *n) | |
38 | { | |
39 | while ((*nl) != NULL) { | |
40 | if ((*nl) == n) | |
41 | return 0; | |
42 | if (n->priority > (*nl)->priority) | |
43 | break; | |
44 | nl = &((*nl)->next); | |
45 | } | |
46 | n->next = *nl; | |
47 | rcu_assign_pointer(*nl, n); | |
48 | return 0; | |
49 | } | |
50 | ||
fe9d4f57 AD |
51 | static int notifier_chain_unregister(struct notifier_block **nl, |
52 | struct notifier_block *n) | |
53 | { | |
54 | while ((*nl) != NULL) { | |
55 | if ((*nl) == n) { | |
56 | rcu_assign_pointer(*nl, n->next); | |
57 | return 0; | |
58 | } | |
59 | nl = &((*nl)->next); | |
60 | } | |
61 | return -ENOENT; | |
62 | } | |
63 | ||
64 | /** | |
65 | * notifier_call_chain - Informs the registered notifiers about an event. | |
66 | * @nl: Pointer to head of the blocking notifier chain | |
67 | * @val: Value passed unmodified to notifier function | |
68 | * @v: Pointer passed unmodified to notifier function | |
69 | * @nr_to_call: Number of notifier functions to be called. Don't care | |
70 | * value of this parameter is -1. | |
71 | * @nr_calls: Records the number of notifications sent. Don't care | |
72 | * value of this field is NULL. | |
73 | * @returns: notifier_call_chain returns the value returned by the | |
74 | * last notifier function called. | |
75 | */ | |
b40a2cb6 MH |
76 | static int notifier_call_chain(struct notifier_block **nl, |
77 | unsigned long val, void *v, | |
78 | int nr_to_call, int *nr_calls) | |
fe9d4f57 AD |
79 | { |
80 | int ret = NOTIFY_DONE; | |
81 | struct notifier_block *nb, *next_nb; | |
82 | ||
d11c563d | 83 | nb = rcu_dereference_raw(*nl); |
fe9d4f57 AD |
84 | |
85 | while (nb && nr_to_call) { | |
d11c563d | 86 | next_nb = rcu_dereference_raw(nb->next); |
1b2439db AV |
87 | |
88 | #ifdef CONFIG_DEBUG_NOTIFIERS | |
ab7476cf | 89 | if (unlikely(!func_ptr_is_kernel_text(nb->notifier_call))) { |
1b2439db AV |
90 | WARN(1, "Invalid notifier called!"); |
91 | nb = next_nb; | |
92 | continue; | |
93 | } | |
94 | #endif | |
1cac41cb MB |
95 | if (val == PM_SUSPEND_PREPARE || val == PM_POST_SUSPEND) |
96 | exynos_ss_suspend(nb->notifier_call, NULL, ESS_FLAG_IN); | |
fe9d4f57 | 97 | ret = nb->notifier_call(nb, val, v); |
1cac41cb MB |
98 | if (val == PM_SUSPEND_PREPARE || val == PM_POST_SUSPEND) |
99 | exynos_ss_suspend(nb->notifier_call, NULL, ESS_FLAG_OUT); | |
fe9d4f57 AD |
100 | |
101 | if (nr_calls) | |
102 | (*nr_calls)++; | |
103 | ||
104 | if ((ret & NOTIFY_STOP_MASK) == NOTIFY_STOP_MASK) | |
105 | break; | |
106 | nb = next_nb; | |
107 | nr_to_call--; | |
108 | } | |
109 | return ret; | |
110 | } | |
b40a2cb6 | 111 | NOKPROBE_SYMBOL(notifier_call_chain); |
fe9d4f57 AD |
112 | |
113 | /* | |
114 | * Atomic notifier chain routines. Registration and unregistration | |
115 | * use a spinlock, and call_chain is synchronized by RCU (no locks). | |
116 | */ | |
117 | ||
118 | /** | |
119 | * atomic_notifier_chain_register - Add notifier to an atomic notifier chain | |
120 | * @nh: Pointer to head of the atomic notifier chain | |
121 | * @n: New entry in notifier chain | |
122 | * | |
123 | * Adds a notifier to an atomic notifier chain. | |
124 | * | |
125 | * Currently always returns zero. | |
126 | */ | |
127 | int atomic_notifier_chain_register(struct atomic_notifier_head *nh, | |
128 | struct notifier_block *n) | |
129 | { | |
130 | unsigned long flags; | |
131 | int ret; | |
132 | ||
133 | spin_lock_irqsave(&nh->lock, flags); | |
134 | ret = notifier_chain_register(&nh->head, n); | |
135 | spin_unlock_irqrestore(&nh->lock, flags); | |
136 | return ret; | |
137 | } | |
138 | EXPORT_SYMBOL_GPL(atomic_notifier_chain_register); | |
139 | ||
140 | /** | |
141 | * atomic_notifier_chain_unregister - Remove notifier from an atomic notifier chain | |
142 | * @nh: Pointer to head of the atomic notifier chain | |
143 | * @n: Entry to remove from notifier chain | |
144 | * | |
145 | * Removes a notifier from an atomic notifier chain. | |
146 | * | |
147 | * Returns zero on success or %-ENOENT on failure. | |
148 | */ | |
149 | int atomic_notifier_chain_unregister(struct atomic_notifier_head *nh, | |
150 | struct notifier_block *n) | |
151 | { | |
152 | unsigned long flags; | |
153 | int ret; | |
154 | ||
155 | spin_lock_irqsave(&nh->lock, flags); | |
156 | ret = notifier_chain_unregister(&nh->head, n); | |
157 | spin_unlock_irqrestore(&nh->lock, flags); | |
158 | synchronize_rcu(); | |
159 | return ret; | |
160 | } | |
161 | EXPORT_SYMBOL_GPL(atomic_notifier_chain_unregister); | |
162 | ||
163 | /** | |
164 | * __atomic_notifier_call_chain - Call functions in an atomic notifier chain | |
165 | * @nh: Pointer to head of the atomic notifier chain | |
166 | * @val: Value passed unmodified to notifier function | |
167 | * @v: Pointer passed unmodified to notifier function | |
168 | * @nr_to_call: See the comment for notifier_call_chain. | |
169 | * @nr_calls: See the comment for notifier_call_chain. | |
170 | * | |
171 | * Calls each function in a notifier chain in turn. The functions | |
172 | * run in an atomic context, so they must not block. | |
173 | * This routine uses RCU to synchronize with changes to the chain. | |
174 | * | |
175 | * If the return value of the notifier can be and'ed | |
176 | * with %NOTIFY_STOP_MASK then atomic_notifier_call_chain() | |
177 | * will return immediately, with the return value of | |
178 | * the notifier function which halted execution. | |
179 | * Otherwise the return value is the return value | |
180 | * of the last notifier function called. | |
181 | */ | |
b40a2cb6 MH |
182 | int __atomic_notifier_call_chain(struct atomic_notifier_head *nh, |
183 | unsigned long val, void *v, | |
184 | int nr_to_call, int *nr_calls) | |
fe9d4f57 AD |
185 | { |
186 | int ret; | |
187 | ||
188 | rcu_read_lock(); | |
189 | ret = notifier_call_chain(&nh->head, val, v, nr_to_call, nr_calls); | |
190 | rcu_read_unlock(); | |
191 | return ret; | |
192 | } | |
193 | EXPORT_SYMBOL_GPL(__atomic_notifier_call_chain); | |
b40a2cb6 | 194 | NOKPROBE_SYMBOL(__atomic_notifier_call_chain); |
fe9d4f57 | 195 | |
b40a2cb6 MH |
196 | int atomic_notifier_call_chain(struct atomic_notifier_head *nh, |
197 | unsigned long val, void *v) | |
fe9d4f57 AD |
198 | { |
199 | return __atomic_notifier_call_chain(nh, val, v, -1, NULL); | |
200 | } | |
201 | EXPORT_SYMBOL_GPL(atomic_notifier_call_chain); | |
b40a2cb6 | 202 | NOKPROBE_SYMBOL(atomic_notifier_call_chain); |
fe9d4f57 AD |
203 | |
204 | /* | |
205 | * Blocking notifier chain routines. All access to the chain is | |
206 | * synchronized by an rwsem. | |
207 | */ | |
208 | ||
209 | /** | |
210 | * blocking_notifier_chain_register - Add notifier to a blocking notifier chain | |
211 | * @nh: Pointer to head of the blocking notifier chain | |
212 | * @n: New entry in notifier chain | |
213 | * | |
214 | * Adds a notifier to a blocking notifier chain. | |
215 | * Must be called in process context. | |
216 | * | |
217 | * Currently always returns zero. | |
218 | */ | |
219 | int blocking_notifier_chain_register(struct blocking_notifier_head *nh, | |
220 | struct notifier_block *n) | |
221 | { | |
222 | int ret; | |
223 | ||
224 | /* | |
225 | * This code gets used during boot-up, when task switching is | |
226 | * not yet working and interrupts must remain disabled. At | |
227 | * such times we must not call down_write(). | |
228 | */ | |
229 | if (unlikely(system_state == SYSTEM_BOOTING)) | |
230 | return notifier_chain_register(&nh->head, n); | |
231 | ||
232 | down_write(&nh->rwsem); | |
233 | ret = notifier_chain_register(&nh->head, n); | |
234 | up_write(&nh->rwsem); | |
235 | return ret; | |
236 | } | |
237 | EXPORT_SYMBOL_GPL(blocking_notifier_chain_register); | |
238 | ||
6546bc42 ND |
239 | /** |
240 | * blocking_notifier_chain_cond_register - Cond add notifier to a blocking notifier chain | |
241 | * @nh: Pointer to head of the blocking notifier chain | |
242 | * @n: New entry in notifier chain | |
243 | * | |
244 | * Adds a notifier to a blocking notifier chain, only if not already | |
245 | * present in the chain. | |
246 | * Must be called in process context. | |
247 | * | |
248 | * Currently always returns zero. | |
249 | */ | |
250 | int blocking_notifier_chain_cond_register(struct blocking_notifier_head *nh, | |
251 | struct notifier_block *n) | |
252 | { | |
253 | int ret; | |
254 | ||
255 | down_write(&nh->rwsem); | |
256 | ret = notifier_chain_cond_register(&nh->head, n); | |
257 | up_write(&nh->rwsem); | |
258 | return ret; | |
259 | } | |
260 | EXPORT_SYMBOL_GPL(blocking_notifier_chain_cond_register); | |
261 | ||
fe9d4f57 AD |
262 | /** |
263 | * blocking_notifier_chain_unregister - Remove notifier from a blocking notifier chain | |
264 | * @nh: Pointer to head of the blocking notifier chain | |
265 | * @n: Entry to remove from notifier chain | |
266 | * | |
267 | * Removes a notifier from a blocking notifier chain. | |
268 | * Must be called from process context. | |
269 | * | |
270 | * Returns zero on success or %-ENOENT on failure. | |
271 | */ | |
272 | int blocking_notifier_chain_unregister(struct blocking_notifier_head *nh, | |
273 | struct notifier_block *n) | |
274 | { | |
275 | int ret; | |
276 | ||
277 | /* | |
278 | * This code gets used during boot-up, when task switching is | |
279 | * not yet working and interrupts must remain disabled. At | |
280 | * such times we must not call down_write(). | |
281 | */ | |
282 | if (unlikely(system_state == SYSTEM_BOOTING)) | |
283 | return notifier_chain_unregister(&nh->head, n); | |
284 | ||
285 | down_write(&nh->rwsem); | |
286 | ret = notifier_chain_unregister(&nh->head, n); | |
287 | up_write(&nh->rwsem); | |
288 | return ret; | |
289 | } | |
290 | EXPORT_SYMBOL_GPL(blocking_notifier_chain_unregister); | |
291 | ||
292 | /** | |
293 | * __blocking_notifier_call_chain - Call functions in a blocking notifier chain | |
294 | * @nh: Pointer to head of the blocking notifier chain | |
295 | * @val: Value passed unmodified to notifier function | |
296 | * @v: Pointer passed unmodified to notifier function | |
297 | * @nr_to_call: See comment for notifier_call_chain. | |
298 | * @nr_calls: See comment for notifier_call_chain. | |
299 | * | |
300 | * Calls each function in a notifier chain in turn. The functions | |
301 | * run in a process context, so they are allowed to block. | |
302 | * | |
303 | * If the return value of the notifier can be and'ed | |
304 | * with %NOTIFY_STOP_MASK then blocking_notifier_call_chain() | |
305 | * will return immediately, with the return value of | |
306 | * the notifier function which halted execution. | |
307 | * Otherwise the return value is the return value | |
308 | * of the last notifier function called. | |
309 | */ | |
310 | int __blocking_notifier_call_chain(struct blocking_notifier_head *nh, | |
311 | unsigned long val, void *v, | |
312 | int nr_to_call, int *nr_calls) | |
313 | { | |
314 | int ret = NOTIFY_DONE; | |
315 | ||
316 | /* | |
317 | * We check the head outside the lock, but if this access is | |
318 | * racy then it does not matter what the result of the test | |
319 | * is, we re-check the list after having taken the lock anyway: | |
320 | */ | |
8857563b | 321 | if (rcu_access_pointer(nh->head)) { |
fe9d4f57 AD |
322 | down_read(&nh->rwsem); |
323 | ret = notifier_call_chain(&nh->head, val, v, nr_to_call, | |
324 | nr_calls); | |
325 | up_read(&nh->rwsem); | |
326 | } | |
327 | return ret; | |
328 | } | |
329 | EXPORT_SYMBOL_GPL(__blocking_notifier_call_chain); | |
330 | ||
331 | int blocking_notifier_call_chain(struct blocking_notifier_head *nh, | |
332 | unsigned long val, void *v) | |
333 | { | |
334 | return __blocking_notifier_call_chain(nh, val, v, -1, NULL); | |
335 | } | |
336 | EXPORT_SYMBOL_GPL(blocking_notifier_call_chain); | |
337 | ||
338 | /* | |
339 | * Raw notifier chain routines. There is no protection; | |
340 | * the caller must provide it. Use at your own risk! | |
341 | */ | |
342 | ||
343 | /** | |
344 | * raw_notifier_chain_register - Add notifier to a raw notifier chain | |
345 | * @nh: Pointer to head of the raw notifier chain | |
346 | * @n: New entry in notifier chain | |
347 | * | |
348 | * Adds a notifier to a raw notifier chain. | |
349 | * All locking must be provided by the caller. | |
350 | * | |
351 | * Currently always returns zero. | |
352 | */ | |
353 | int raw_notifier_chain_register(struct raw_notifier_head *nh, | |
354 | struct notifier_block *n) | |
355 | { | |
356 | return notifier_chain_register(&nh->head, n); | |
357 | } | |
358 | EXPORT_SYMBOL_GPL(raw_notifier_chain_register); | |
359 | ||
360 | /** | |
361 | * raw_notifier_chain_unregister - Remove notifier from a raw notifier chain | |
362 | * @nh: Pointer to head of the raw notifier chain | |
363 | * @n: Entry to remove from notifier chain | |
364 | * | |
365 | * Removes a notifier from a raw notifier chain. | |
366 | * All locking must be provided by the caller. | |
367 | * | |
368 | * Returns zero on success or %-ENOENT on failure. | |
369 | */ | |
370 | int raw_notifier_chain_unregister(struct raw_notifier_head *nh, | |
371 | struct notifier_block *n) | |
372 | { | |
373 | return notifier_chain_unregister(&nh->head, n); | |
374 | } | |
375 | EXPORT_SYMBOL_GPL(raw_notifier_chain_unregister); | |
376 | ||
377 | /** | |
378 | * __raw_notifier_call_chain - Call functions in a raw notifier chain | |
379 | * @nh: Pointer to head of the raw notifier chain | |
380 | * @val: Value passed unmodified to notifier function | |
381 | * @v: Pointer passed unmodified to notifier function | |
382 | * @nr_to_call: See comment for notifier_call_chain. | |
383 | * @nr_calls: See comment for notifier_call_chain | |
384 | * | |
385 | * Calls each function in a notifier chain in turn. The functions | |
386 | * run in an undefined context. | |
387 | * All locking must be provided by the caller. | |
388 | * | |
389 | * If the return value of the notifier can be and'ed | |
390 | * with %NOTIFY_STOP_MASK then raw_notifier_call_chain() | |
391 | * will return immediately, with the return value of | |
392 | * the notifier function which halted execution. | |
393 | * Otherwise the return value is the return value | |
394 | * of the last notifier function called. | |
395 | */ | |
396 | int __raw_notifier_call_chain(struct raw_notifier_head *nh, | |
397 | unsigned long val, void *v, | |
398 | int nr_to_call, int *nr_calls) | |
399 | { | |
400 | return notifier_call_chain(&nh->head, val, v, nr_to_call, nr_calls); | |
401 | } | |
402 | EXPORT_SYMBOL_GPL(__raw_notifier_call_chain); | |
403 | ||
404 | int raw_notifier_call_chain(struct raw_notifier_head *nh, | |
405 | unsigned long val, void *v) | |
406 | { | |
407 | return __raw_notifier_call_chain(nh, val, v, -1, NULL); | |
408 | } | |
409 | EXPORT_SYMBOL_GPL(raw_notifier_call_chain); | |
410 | ||
83fe27ea | 411 | #ifdef CONFIG_SRCU |
fe9d4f57 AD |
412 | /* |
413 | * SRCU notifier chain routines. Registration and unregistration | |
414 | * use a mutex, and call_chain is synchronized by SRCU (no locks). | |
415 | */ | |
416 | ||
417 | /** | |
418 | * srcu_notifier_chain_register - Add notifier to an SRCU notifier chain | |
419 | * @nh: Pointer to head of the SRCU notifier chain | |
420 | * @n: New entry in notifier chain | |
421 | * | |
422 | * Adds a notifier to an SRCU notifier chain. | |
423 | * Must be called in process context. | |
424 | * | |
425 | * Currently always returns zero. | |
426 | */ | |
427 | int srcu_notifier_chain_register(struct srcu_notifier_head *nh, | |
428 | struct notifier_block *n) | |
429 | { | |
430 | int ret; | |
431 | ||
432 | /* | |
433 | * This code gets used during boot-up, when task switching is | |
434 | * not yet working and interrupts must remain disabled. At | |
435 | * such times we must not call mutex_lock(). | |
436 | */ | |
437 | if (unlikely(system_state == SYSTEM_BOOTING)) | |
438 | return notifier_chain_register(&nh->head, n); | |
439 | ||
440 | mutex_lock(&nh->mutex); | |
441 | ret = notifier_chain_register(&nh->head, n); | |
442 | mutex_unlock(&nh->mutex); | |
443 | return ret; | |
444 | } | |
445 | EXPORT_SYMBOL_GPL(srcu_notifier_chain_register); | |
446 | ||
447 | /** | |
448 | * srcu_notifier_chain_unregister - Remove notifier from an SRCU notifier chain | |
449 | * @nh: Pointer to head of the SRCU notifier chain | |
450 | * @n: Entry to remove from notifier chain | |
451 | * | |
452 | * Removes a notifier from an SRCU notifier chain. | |
453 | * Must be called from process context. | |
454 | * | |
455 | * Returns zero on success or %-ENOENT on failure. | |
456 | */ | |
457 | int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh, | |
458 | struct notifier_block *n) | |
459 | { | |
460 | int ret; | |
461 | ||
462 | /* | |
463 | * This code gets used during boot-up, when task switching is | |
464 | * not yet working and interrupts must remain disabled. At | |
465 | * such times we must not call mutex_lock(). | |
466 | */ | |
467 | if (unlikely(system_state == SYSTEM_BOOTING)) | |
468 | return notifier_chain_unregister(&nh->head, n); | |
469 | ||
470 | mutex_lock(&nh->mutex); | |
471 | ret = notifier_chain_unregister(&nh->head, n); | |
472 | mutex_unlock(&nh->mutex); | |
473 | synchronize_srcu(&nh->srcu); | |
474 | return ret; | |
475 | } | |
476 | EXPORT_SYMBOL_GPL(srcu_notifier_chain_unregister); | |
477 | ||
478 | /** | |
479 | * __srcu_notifier_call_chain - Call functions in an SRCU notifier chain | |
480 | * @nh: Pointer to head of the SRCU notifier chain | |
481 | * @val: Value passed unmodified to notifier function | |
482 | * @v: Pointer passed unmodified to notifier function | |
483 | * @nr_to_call: See comment for notifier_call_chain. | |
484 | * @nr_calls: See comment for notifier_call_chain | |
485 | * | |
486 | * Calls each function in a notifier chain in turn. The functions | |
487 | * run in a process context, so they are allowed to block. | |
488 | * | |
489 | * If the return value of the notifier can be and'ed | |
490 | * with %NOTIFY_STOP_MASK then srcu_notifier_call_chain() | |
491 | * will return immediately, with the return value of | |
492 | * the notifier function which halted execution. | |
493 | * Otherwise the return value is the return value | |
494 | * of the last notifier function called. | |
495 | */ | |
496 | int __srcu_notifier_call_chain(struct srcu_notifier_head *nh, | |
497 | unsigned long val, void *v, | |
498 | int nr_to_call, int *nr_calls) | |
499 | { | |
500 | int ret; | |
501 | int idx; | |
502 | ||
503 | idx = srcu_read_lock(&nh->srcu); | |
504 | ret = notifier_call_chain(&nh->head, val, v, nr_to_call, nr_calls); | |
505 | srcu_read_unlock(&nh->srcu, idx); | |
506 | return ret; | |
507 | } | |
508 | EXPORT_SYMBOL_GPL(__srcu_notifier_call_chain); | |
509 | ||
510 | int srcu_notifier_call_chain(struct srcu_notifier_head *nh, | |
511 | unsigned long val, void *v) | |
512 | { | |
513 | return __srcu_notifier_call_chain(nh, val, v, -1, NULL); | |
514 | } | |
515 | EXPORT_SYMBOL_GPL(srcu_notifier_call_chain); | |
516 | ||
517 | /** | |
518 | * srcu_init_notifier_head - Initialize an SRCU notifier head | |
519 | * @nh: Pointer to head of the srcu notifier chain | |
520 | * | |
521 | * Unlike other sorts of notifier heads, SRCU notifier heads require | |
522 | * dynamic initialization. Be sure to call this routine before | |
523 | * calling any of the other SRCU notifier routines for this head. | |
524 | * | |
525 | * If an SRCU notifier head is deallocated, it must first be cleaned | |
526 | * up by calling srcu_cleanup_notifier_head(). Otherwise the head's | |
527 | * per-cpu data (used by the SRCU mechanism) will leak. | |
528 | */ | |
529 | void srcu_init_notifier_head(struct srcu_notifier_head *nh) | |
530 | { | |
531 | mutex_init(&nh->mutex); | |
532 | if (init_srcu_struct(&nh->srcu) < 0) | |
533 | BUG(); | |
534 | nh->head = NULL; | |
535 | } | |
536 | EXPORT_SYMBOL_GPL(srcu_init_notifier_head); | |
537 | ||
83fe27ea PK |
538 | #endif /* CONFIG_SRCU */ |
539 | ||
fe9d4f57 AD |
540 | static ATOMIC_NOTIFIER_HEAD(die_chain); |
541 | ||
b40a2cb6 | 542 | int notrace notify_die(enum die_val val, const char *str, |
fe9d4f57 AD |
543 | struct pt_regs *regs, long err, int trap, int sig) |
544 | { | |
545 | struct die_args args = { | |
546 | .regs = regs, | |
547 | .str = str, | |
548 | .err = err, | |
549 | .trapnr = trap, | |
550 | .signr = sig, | |
551 | ||
552 | }; | |
5778077d | 553 | RCU_LOCKDEP_WARN(!rcu_is_watching(), |
e727c7d7 | 554 | "notify_die called but RCU thinks we're quiescent"); |
fe9d4f57 AD |
555 | return atomic_notifier_call_chain(&die_chain, val, &args); |
556 | } | |
b40a2cb6 | 557 | NOKPROBE_SYMBOL(notify_die); |
fe9d4f57 AD |
558 | |
559 | int register_die_notifier(struct notifier_block *nb) | |
560 | { | |
561 | vmalloc_sync_all(); | |
562 | return atomic_notifier_chain_register(&die_chain, nb); | |
563 | } | |
564 | EXPORT_SYMBOL_GPL(register_die_notifier); | |
565 | ||
566 | int unregister_die_notifier(struct notifier_block *nb) | |
567 | { | |
568 | return atomic_notifier_chain_unregister(&die_chain, nb); | |
569 | } | |
570 | EXPORT_SYMBOL_GPL(unregister_die_notifier); |