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67337c4a MD |
1 | // SPDX-License-Identifier: MIT |
2 | /* | |
3 | * Copyright 2022 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | */ | |
5 | ||
6 | #include <side/trace.h> | |
7 | #include <string.h> | |
b1bf768c | 8 | #include <assert.h> |
67337c4a MD |
9 | |
10 | #include "rcu.h" | |
11 | #include "list.h" | |
12 | ||
13 | /* Top 8 bits reserved for kernel tracer use. */ | |
14 | #if SIDE_BITS_PER_LONG == 64 | |
15 | # define SIDE_EVENT_ENABLED_KERNEL_MASK 0xFF00000000000000ULL | |
16 | # define SIDE_EVENT_ENABLED_KERNEL_USER_EVENT_MASK 0x8000000000000000ULL | |
17 | ||
18 | /* Allow 2^56 tracer references on an event. */ | |
19 | # define SIDE_EVENT_ENABLED_USER_MASK 0x00FFFFFFFFFFFFFFULL | |
20 | #else | |
21 | # define SIDE_EVENT_ENABLED_KERNEL_MASK 0xFF000000UL | |
22 | # define SIDE_EVENT_ENABLED_KERNEL_USER_EVENT_MASK 0x80000000UL | |
23 | ||
24 | /* Allow 2^24 tracer references on an event. */ | |
25 | # define SIDE_EVENT_ENABLED_USER_MASK 0x00FFFFFFUL | |
26 | #endif | |
27 | ||
28 | struct side_events_register_handle { | |
29 | struct side_list_node node; | |
30 | struct side_event_description **events; | |
31 | uint32_t nr_events; | |
32 | }; | |
33 | ||
34 | struct side_tracer_handle { | |
35 | struct side_list_node node; | |
36 | void (*cb)(enum side_tracer_notification notif, | |
37 | struct side_event_description **events, uint32_t nr_events, void *priv); | |
38 | void *priv; | |
39 | }; | |
40 | ||
867b4725 MD |
41 | struct side_callback { |
42 | union { | |
43 | void (*call)(const struct side_event_description *desc, | |
44 | const struct side_arg_vec *side_arg_vec, | |
45 | void *priv); | |
46 | void (*call_variadic)(const struct side_event_description *desc, | |
47 | const struct side_arg_vec *side_arg_vec, | |
48 | const struct side_arg_dynamic_struct *var_struct, | |
49 | void *priv); | |
50 | } u; | |
51 | void *priv; | |
92c377f9 | 52 | void *key; |
867b4725 MD |
53 | }; |
54 | ||
67337c4a MD |
55 | static struct side_rcu_gp_state rcu_gp; |
56 | ||
57 | /* | |
58 | * Lazy initialization for early use within library constructors. | |
59 | */ | |
60 | static bool initialized; | |
61 | /* | |
62 | * Do not register/unregister any more events after destructor. | |
63 | */ | |
64 | static bool finalized; | |
65 | ||
66 | /* | |
67 | * Recursive mutex to allow tracer callbacks to use the side API. | |
68 | */ | |
69 | static pthread_mutex_t side_lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP; | |
70 | ||
71 | static DEFINE_SIDE_LIST_HEAD(side_events_list); | |
72 | static DEFINE_SIDE_LIST_HEAD(side_tracer_list); | |
73 | ||
74 | /* | |
75 | * The empty callback has a NULL function callback pointer, which stops | |
76 | * iteration on the array of callbacks immediately. | |
77 | */ | |
867b4725 | 78 | const char side_empty_callback[sizeof(struct side_callback)]; |
67337c4a | 79 | |
92c377f9 | 80 | void side_call_key(const struct side_event_state *event_state, const struct side_arg_vec *side_arg_vec, void *key) |
67337c4a MD |
81 | { |
82 | struct side_rcu_read_state rcu_read_state; | |
b2a84b9f | 83 | const struct side_event_state_0 *es0; |
67337c4a MD |
84 | const struct side_callback *side_cb; |
85 | uintptr_t enabled; | |
86 | ||
87 | if (side_unlikely(finalized)) | |
88 | return; | |
89 | if (side_unlikely(!initialized)) | |
90 | side_init(); | |
b2a84b9f MD |
91 | if (side_unlikely(event_state->version != 0)) |
92 | abort(); | |
49aea3ef | 93 | es0 = side_container_of(event_state, const struct side_event_state_0, parent); |
7269a8a3 | 94 | assert(!(es0->desc->flags & SIDE_EVENT_FLAG_VARIADIC)); |
b2a84b9f | 95 | enabled = __atomic_load_n(&es0->enabled, __ATOMIC_RELAXED); |
67337c4a MD |
96 | if (side_unlikely(enabled & SIDE_EVENT_ENABLED_KERNEL_USER_EVENT_MASK)) { |
97 | // TODO: call kernel write. | |
98 | } | |
99 | side_rcu_read_begin(&rcu_gp, &rcu_read_state); | |
92c377f9 MD |
100 | for (side_cb = side_rcu_dereference(es0->callbacks); side_cb->u.call != NULL; side_cb++) { |
101 | /* A NULL key is always a match. */ | |
102 | if (key && side_cb->key && side_cb->key != key) | |
103 | continue; | |
7269a8a3 | 104 | side_cb->u.call(es0->desc, side_arg_vec, side_cb->priv); |
92c377f9 | 105 | } |
67337c4a MD |
106 | side_rcu_read_end(&rcu_gp, &rcu_read_state); |
107 | } | |
108 | ||
92c377f9 MD |
109 | void side_call(const struct side_event_state *event_state, const struct side_arg_vec *side_arg_vec) |
110 | { | |
111 | side_call_key(event_state, side_arg_vec, NULL); | |
112 | } | |
113 | ||
114 | void side_call_variadic_key(const struct side_event_state *event_state, | |
67337c4a | 115 | const struct side_arg_vec *side_arg_vec, |
92c377f9 MD |
116 | const struct side_arg_dynamic_struct *var_struct, |
117 | void *key) | |
67337c4a MD |
118 | { |
119 | struct side_rcu_read_state rcu_read_state; | |
b2a84b9f | 120 | const struct side_event_state_0 *es0; |
67337c4a MD |
121 | const struct side_callback *side_cb; |
122 | uintptr_t enabled; | |
123 | ||
124 | if (side_unlikely(finalized)) | |
125 | return; | |
126 | if (side_unlikely(!initialized)) | |
127 | side_init(); | |
b2a84b9f MD |
128 | if (side_unlikely(event_state->version != 0)) |
129 | abort(); | |
49aea3ef | 130 | es0 = side_container_of(event_state, const struct side_event_state_0, parent); |
7269a8a3 | 131 | assert(es0->desc->flags & SIDE_EVENT_FLAG_VARIADIC); |
b2a84b9f | 132 | enabled = __atomic_load_n(&es0->enabled, __ATOMIC_RELAXED); |
67337c4a MD |
133 | if (side_unlikely(enabled & SIDE_EVENT_ENABLED_KERNEL_USER_EVENT_MASK)) { |
134 | // TODO: call kernel write. | |
135 | } | |
136 | side_rcu_read_begin(&rcu_gp, &rcu_read_state); | |
92c377f9 MD |
137 | for (side_cb = side_rcu_dereference(es0->callbacks); side_cb->u.call_variadic != NULL; side_cb++) { |
138 | /* A NULL key is always a match. */ | |
139 | if (key && side_cb->key && side_cb->key != key) | |
140 | continue; | |
7269a8a3 | 141 | side_cb->u.call_variadic(es0->desc, side_arg_vec, var_struct, side_cb->priv); |
92c377f9 | 142 | } |
67337c4a MD |
143 | side_rcu_read_end(&rcu_gp, &rcu_read_state); |
144 | } | |
145 | ||
92c377f9 MD |
146 | void side_call_variadic(const struct side_event_state *event_state, |
147 | const struct side_arg_vec *side_arg_vec, | |
148 | const struct side_arg_dynamic_struct *var_struct) | |
149 | { | |
150 | side_call_variadic_key(event_state, side_arg_vec, var_struct, NULL); | |
151 | } | |
152 | ||
67337c4a MD |
153 | static |
154 | const struct side_callback *side_tracer_callback_lookup( | |
155 | const struct side_event_description *desc, | |
92c377f9 | 156 | void *call, void *priv, void *key) |
67337c4a | 157 | { |
0b9e59d6 | 158 | struct side_event_state *event_state = side_ptr_get(desc->state); |
b2a84b9f | 159 | const struct side_event_state_0 *es0; |
67337c4a MD |
160 | const struct side_callback *cb; |
161 | ||
b2a84b9f MD |
162 | if (side_unlikely(event_state->version != 0)) |
163 | abort(); | |
49aea3ef | 164 | es0 = side_container_of(event_state, const struct side_event_state_0, parent); |
7269a8a3 | 165 | for (cb = es0->callbacks; cb->u.call != NULL; cb++) { |
92c377f9 | 166 | if ((void *) cb->u.call == call && cb->priv == priv && cb->key == key) |
67337c4a MD |
167 | return cb; |
168 | } | |
169 | return NULL; | |
170 | } | |
171 | ||
172 | static | |
173 | int _side_tracer_callback_register(struct side_event_description *desc, | |
92c377f9 | 174 | void *call, void *priv, void *key) |
67337c4a | 175 | { |
0b9e59d6 | 176 | struct side_event_state *event_state; |
67337c4a | 177 | struct side_callback *old_cb, *new_cb; |
b2a84b9f | 178 | struct side_event_state_0 *es0; |
67337c4a MD |
179 | int ret = SIDE_ERROR_OK; |
180 | uint32_t old_nr_cb; | |
181 | ||
182 | if (!call) | |
183 | return SIDE_ERROR_INVAL; | |
184 | if (finalized) | |
185 | return SIDE_ERROR_EXITING; | |
186 | if (!initialized) | |
187 | side_init(); | |
188 | pthread_mutex_lock(&side_lock); | |
0b9e59d6 | 189 | event_state = side_ptr_get(desc->state); |
b2a84b9f MD |
190 | if (side_unlikely(event_state->version != 0)) |
191 | abort(); | |
49aea3ef | 192 | es0 = side_container_of(event_state, struct side_event_state_0, parent); |
3cac1780 | 193 | old_nr_cb = es0->nr_callbacks; |
67337c4a MD |
194 | if (old_nr_cb == UINT32_MAX) { |
195 | ret = SIDE_ERROR_INVAL; | |
196 | goto unlock; | |
197 | } | |
198 | /* Reject duplicate (call, priv) tuples. */ | |
92c377f9 | 199 | if (side_tracer_callback_lookup(desc, call, priv, key)) { |
67337c4a MD |
200 | ret = SIDE_ERROR_EXIST; |
201 | goto unlock; | |
202 | } | |
7269a8a3 | 203 | old_cb = (struct side_callback *) es0->callbacks; |
67337c4a MD |
204 | /* old_nr_cb + 1 (new cb) + 1 (NULL) */ |
205 | new_cb = (struct side_callback *) calloc(old_nr_cb + 2, sizeof(struct side_callback)); | |
206 | if (!new_cb) { | |
207 | ret = SIDE_ERROR_NOMEM; | |
208 | goto unlock; | |
209 | } | |
210 | memcpy(new_cb, old_cb, old_nr_cb); | |
211 | if (desc->flags & SIDE_EVENT_FLAG_VARIADIC) | |
212 | new_cb[old_nr_cb].u.call_variadic = | |
213 | (side_tracer_callback_variadic_func) call; | |
214 | else | |
215 | new_cb[old_nr_cb].u.call = | |
216 | (side_tracer_callback_func) call; | |
217 | new_cb[old_nr_cb].priv = priv; | |
92c377f9 | 218 | new_cb[old_nr_cb].key = key; |
f60d8121 | 219 | /* High order bits are already zeroed. */ |
7269a8a3 | 220 | side_rcu_assign_pointer(es0->callbacks, new_cb); |
67337c4a MD |
221 | side_rcu_wait_grace_period(&rcu_gp); |
222 | if (old_nr_cb) | |
223 | free(old_cb); | |
3cac1780 | 224 | es0->nr_callbacks++; |
67337c4a MD |
225 | /* Increment concurrently with kernel setting the top bits. */ |
226 | if (!old_nr_cb) | |
b2a84b9f | 227 | (void) __atomic_add_fetch(&es0->enabled, 1, __ATOMIC_RELAXED); |
67337c4a MD |
228 | unlock: |
229 | pthread_mutex_unlock(&side_lock); | |
230 | return ret; | |
231 | } | |
232 | ||
233 | int side_tracer_callback_register(struct side_event_description *desc, | |
234 | side_tracer_callback_func call, | |
92c377f9 | 235 | void *priv, void *key) |
67337c4a MD |
236 | { |
237 | if (desc->flags & SIDE_EVENT_FLAG_VARIADIC) | |
238 | return SIDE_ERROR_INVAL; | |
92c377f9 | 239 | return _side_tracer_callback_register(desc, (void *) call, priv, key); |
67337c4a MD |
240 | } |
241 | ||
242 | int side_tracer_callback_variadic_register(struct side_event_description *desc, | |
243 | side_tracer_callback_variadic_func call_variadic, | |
92c377f9 | 244 | void *priv, void *key) |
67337c4a MD |
245 | { |
246 | if (!(desc->flags & SIDE_EVENT_FLAG_VARIADIC)) | |
247 | return SIDE_ERROR_INVAL; | |
92c377f9 | 248 | return _side_tracer_callback_register(desc, (void *) call_variadic, priv, key); |
67337c4a MD |
249 | } |
250 | ||
251 | static int _side_tracer_callback_unregister(struct side_event_description *desc, | |
92c377f9 | 252 | void *call, void *priv, void *key) |
67337c4a | 253 | { |
0b9e59d6 | 254 | struct side_event_state *event_state; |
67337c4a MD |
255 | struct side_callback *old_cb, *new_cb; |
256 | const struct side_callback *cb_pos; | |
b2a84b9f | 257 | struct side_event_state_0 *es0; |
67337c4a MD |
258 | uint32_t pos_idx; |
259 | int ret = SIDE_ERROR_OK; | |
260 | uint32_t old_nr_cb; | |
261 | ||
262 | if (!call) | |
263 | return SIDE_ERROR_INVAL; | |
264 | if (finalized) | |
265 | return SIDE_ERROR_EXITING; | |
266 | if (!initialized) | |
267 | side_init(); | |
268 | pthread_mutex_lock(&side_lock); | |
0b9e59d6 | 269 | event_state = side_ptr_get(desc->state); |
b2a84b9f MD |
270 | if (side_unlikely(event_state->version != 0)) |
271 | abort(); | |
49aea3ef | 272 | es0 = side_container_of(event_state, struct side_event_state_0, parent); |
92c377f9 | 273 | cb_pos = side_tracer_callback_lookup(desc, call, priv, key); |
67337c4a MD |
274 | if (!cb_pos) { |
275 | ret = SIDE_ERROR_NOENT; | |
276 | goto unlock; | |
277 | } | |
3cac1780 | 278 | old_nr_cb = es0->nr_callbacks; |
7269a8a3 | 279 | old_cb = (struct side_callback *) es0->callbacks; |
67337c4a MD |
280 | if (old_nr_cb == 1) { |
281 | new_cb = (struct side_callback *) &side_empty_callback; | |
282 | } else { | |
7269a8a3 | 283 | pos_idx = cb_pos - es0->callbacks; |
67337c4a MD |
284 | /* Remove entry at pos_idx. */ |
285 | /* old_nr_cb - 1 (removed cb) + 1 (NULL) */ | |
286 | new_cb = (struct side_callback *) calloc(old_nr_cb, sizeof(struct side_callback)); | |
287 | if (!new_cb) { | |
288 | ret = SIDE_ERROR_NOMEM; | |
289 | goto unlock; | |
290 | } | |
291 | memcpy(new_cb, old_cb, pos_idx); | |
292 | memcpy(&new_cb[pos_idx], &old_cb[pos_idx + 1], old_nr_cb - pos_idx - 1); | |
293 | } | |
f60d8121 | 294 | /* High order bits are already zeroed. */ |
7269a8a3 | 295 | side_rcu_assign_pointer(es0->callbacks, new_cb); |
67337c4a MD |
296 | side_rcu_wait_grace_period(&rcu_gp); |
297 | free(old_cb); | |
3cac1780 | 298 | es0->nr_callbacks--; |
67337c4a MD |
299 | /* Decrement concurrently with kernel setting the top bits. */ |
300 | if (old_nr_cb == 1) | |
b2a84b9f | 301 | (void) __atomic_add_fetch(&es0->enabled, -1, __ATOMIC_RELAXED); |
67337c4a MD |
302 | unlock: |
303 | pthread_mutex_unlock(&side_lock); | |
304 | return ret; | |
305 | } | |
306 | ||
307 | int side_tracer_callback_unregister(struct side_event_description *desc, | |
308 | side_tracer_callback_func call, | |
92c377f9 | 309 | void *priv, void *key) |
67337c4a MD |
310 | { |
311 | if (desc->flags & SIDE_EVENT_FLAG_VARIADIC) | |
312 | return SIDE_ERROR_INVAL; | |
92c377f9 | 313 | return _side_tracer_callback_unregister(desc, (void *) call, priv, key); |
67337c4a MD |
314 | } |
315 | ||
316 | int side_tracer_callback_variadic_unregister(struct side_event_description *desc, | |
317 | side_tracer_callback_variadic_func call_variadic, | |
92c377f9 | 318 | void *priv, void *key) |
67337c4a MD |
319 | { |
320 | if (!(desc->flags & SIDE_EVENT_FLAG_VARIADIC)) | |
321 | return SIDE_ERROR_INVAL; | |
92c377f9 | 322 | return _side_tracer_callback_unregister(desc, (void *) call_variadic, priv, key); |
67337c4a MD |
323 | } |
324 | ||
325 | struct side_events_register_handle *side_events_register(struct side_event_description **events, uint32_t nr_events) | |
326 | { | |
327 | struct side_events_register_handle *events_handle = NULL; | |
328 | struct side_tracer_handle *tracer_handle; | |
329 | ||
330 | if (finalized) | |
331 | return NULL; | |
332 | if (!initialized) | |
333 | side_init(); | |
334 | events_handle = (struct side_events_register_handle *) | |
335 | calloc(1, sizeof(struct side_events_register_handle)); | |
336 | if (!events_handle) | |
337 | return NULL; | |
338 | events_handle->events = events; | |
339 | events_handle->nr_events = nr_events; | |
340 | ||
341 | pthread_mutex_lock(&side_lock); | |
342 | side_list_insert_node_tail(&side_events_list, &events_handle->node); | |
343 | side_list_for_each_entry(tracer_handle, &side_tracer_list, node) { | |
344 | tracer_handle->cb(SIDE_TRACER_NOTIFICATION_INSERT_EVENTS, | |
345 | events, nr_events, tracer_handle->priv); | |
346 | } | |
347 | pthread_mutex_unlock(&side_lock); | |
348 | //TODO: call event batch register ioctl | |
349 | return events_handle; | |
350 | } | |
351 | ||
352 | static | |
353 | void side_event_remove_callbacks(struct side_event_description *desc) | |
354 | { | |
0b9e59d6 | 355 | struct side_event_state *event_state = side_ptr_get(desc->state); |
b2a84b9f | 356 | struct side_event_state_0 *es0; |
67337c4a | 357 | struct side_callback *old_cb; |
3cac1780 | 358 | uint32_t nr_cb; |
67337c4a | 359 | |
b2a84b9f MD |
360 | if (side_unlikely(event_state->version != 0)) |
361 | abort(); | |
49aea3ef | 362 | es0 = side_container_of(event_state, struct side_event_state_0, parent); |
3cac1780 MD |
363 | nr_cb = es0->nr_callbacks; |
364 | if (!nr_cb) | |
365 | return; | |
7269a8a3 | 366 | old_cb = (struct side_callback *) es0->callbacks; |
b2a84b9f | 367 | (void) __atomic_add_fetch(&es0->enabled, -1, __ATOMIC_RELAXED); |
67337c4a MD |
368 | /* |
369 | * Setting the state back to 0 cb and empty callbacks out of | |
370 | * caution. This should not matter because instrumentation is | |
371 | * unreachable. | |
372 | */ | |
3cac1780 | 373 | es0->nr_callbacks = 0; |
7269a8a3 | 374 | side_rcu_assign_pointer(es0->callbacks, &side_empty_callback); |
67337c4a MD |
375 | /* |
376 | * No need to wait for grace period because instrumentation is | |
377 | * unreachable. | |
378 | */ | |
379 | free(old_cb); | |
380 | } | |
381 | ||
382 | /* | |
383 | * Unregister event handle. At this point, all side events in that | |
384 | * handle should be unreachable. | |
385 | */ | |
386 | void side_events_unregister(struct side_events_register_handle *events_handle) | |
387 | { | |
388 | struct side_tracer_handle *tracer_handle; | |
389 | uint32_t i; | |
390 | ||
391 | if (!events_handle) | |
392 | return; | |
393 | if (finalized) | |
394 | return; | |
395 | if (!initialized) | |
396 | side_init(); | |
397 | pthread_mutex_lock(&side_lock); | |
398 | side_list_remove_node(&events_handle->node); | |
399 | side_list_for_each_entry(tracer_handle, &side_tracer_list, node) { | |
400 | tracer_handle->cb(SIDE_TRACER_NOTIFICATION_REMOVE_EVENTS, | |
401 | events_handle->events, events_handle->nr_events, | |
402 | tracer_handle->priv); | |
403 | } | |
404 | for (i = 0; i < events_handle->nr_events; i++) { | |
405 | struct side_event_description *event = events_handle->events[i]; | |
406 | ||
407 | /* Skip NULL pointers */ | |
408 | if (!event) | |
409 | continue; | |
410 | side_event_remove_callbacks(event); | |
411 | } | |
412 | pthread_mutex_unlock(&side_lock); | |
413 | //TODO: call event batch unregister ioctl | |
414 | free(events_handle); | |
415 | } | |
416 | ||
417 | struct side_tracer_handle *side_tracer_event_notification_register( | |
418 | void (*cb)(enum side_tracer_notification notif, | |
419 | struct side_event_description **events, uint32_t nr_events, void *priv), | |
420 | void *priv) | |
421 | { | |
422 | struct side_tracer_handle *tracer_handle; | |
423 | struct side_events_register_handle *events_handle; | |
424 | ||
425 | if (finalized) | |
426 | return NULL; | |
427 | if (!initialized) | |
428 | side_init(); | |
429 | tracer_handle = (struct side_tracer_handle *) | |
430 | calloc(1, sizeof(struct side_tracer_handle)); | |
431 | if (!tracer_handle) | |
432 | return NULL; | |
433 | pthread_mutex_lock(&side_lock); | |
434 | tracer_handle->cb = cb; | |
435 | tracer_handle->priv = priv; | |
436 | side_list_insert_node_tail(&side_tracer_list, &tracer_handle->node); | |
437 | side_list_for_each_entry(events_handle, &side_events_list, node) { | |
438 | cb(SIDE_TRACER_NOTIFICATION_INSERT_EVENTS, | |
439 | events_handle->events, events_handle->nr_events, priv); | |
440 | } | |
441 | pthread_mutex_unlock(&side_lock); | |
442 | return tracer_handle; | |
443 | } | |
444 | ||
445 | void side_tracer_event_notification_unregister(struct side_tracer_handle *tracer_handle) | |
446 | { | |
447 | struct side_events_register_handle *events_handle; | |
448 | ||
449 | if (finalized) | |
450 | return; | |
451 | if (!initialized) | |
452 | side_init(); | |
453 | pthread_mutex_lock(&side_lock); | |
454 | side_list_for_each_entry(events_handle, &side_events_list, node) { | |
455 | tracer_handle->cb(SIDE_TRACER_NOTIFICATION_REMOVE_EVENTS, | |
456 | events_handle->events, events_handle->nr_events, | |
457 | tracer_handle->priv); | |
458 | } | |
459 | side_list_remove_node(&tracer_handle->node); | |
460 | pthread_mutex_unlock(&side_lock); | |
be787080 | 461 | free(tracer_handle); |
67337c4a MD |
462 | } |
463 | ||
464 | void side_init(void) | |
465 | { | |
466 | if (initialized) | |
467 | return; | |
468 | side_rcu_gp_init(&rcu_gp); | |
469 | initialized = true; | |
470 | } | |
471 | ||
472 | /* | |
473 | * side_exit() is executed from a library destructor. It can be called | |
474 | * explicitly at application exit as well. Concurrent side API use is | |
475 | * not expected at that point. | |
476 | */ | |
477 | void side_exit(void) | |
478 | { | |
479 | struct side_events_register_handle *handle, *tmp; | |
480 | ||
481 | if (finalized) | |
482 | return; | |
483 | side_list_for_each_entry_safe(handle, tmp, &side_events_list, node) | |
484 | side_events_unregister(handle); | |
485 | side_rcu_gp_exit(&rcu_gp); | |
486 | finalized = true; | |
487 | } |