Commit | Line | Data |
---|---|---|
97e1c18e MD |
1 | /* |
2 | * Copyright (C) 2008 Mathieu Desnoyers | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | */ | |
18 | #include <linux/module.h> | |
19 | #include <linux/mutex.h> | |
20 | #include <linux/types.h> | |
21 | #include <linux/jhash.h> | |
22 | #include <linux/list.h> | |
23 | #include <linux/rcupdate.h> | |
24 | #include <linux/tracepoint.h> | |
25 | #include <linux/err.h> | |
26 | #include <linux/slab.h> | |
27 | ||
28 | extern struct tracepoint __start___tracepoints[]; | |
29 | extern struct tracepoint __stop___tracepoints[]; | |
30 | ||
31 | /* Set to 1 to enable tracepoint debug output */ | |
32 | static const int tracepoint_debug; | |
33 | ||
34 | /* | |
35 | * tracepoints_mutex nests inside module_mutex. Tracepoints mutex protects the | |
36 | * builtin and module tracepoints and the hash table. | |
37 | */ | |
38 | static DEFINE_MUTEX(tracepoints_mutex); | |
39 | ||
40 | /* | |
41 | * Tracepoint hash table, containing the active tracepoints. | |
42 | * Protected by tracepoints_mutex. | |
43 | */ | |
44 | #define TRACEPOINT_HASH_BITS 6 | |
45 | #define TRACEPOINT_TABLE_SIZE (1 << TRACEPOINT_HASH_BITS) | |
19dba33c | 46 | static struct hlist_head tracepoint_table[TRACEPOINT_TABLE_SIZE]; |
97e1c18e MD |
47 | |
48 | /* | |
49 | * Note about RCU : | |
50 | * It is used to to delay the free of multiple probes array until a quiescent | |
51 | * state is reached. | |
52 | * Tracepoint entries modifications are protected by the tracepoints_mutex. | |
53 | */ | |
54 | struct tracepoint_entry { | |
55 | struct hlist_node hlist; | |
56 | void **funcs; | |
57 | int refcount; /* Number of times armed. 0 if disarmed. */ | |
97e1c18e MD |
58 | char name[0]; |
59 | }; | |
60 | ||
19dba33c | 61 | struct tp_probes { |
127cafbb LJ |
62 | union { |
63 | struct rcu_head rcu; | |
64 | struct list_head list; | |
65 | } u; | |
19dba33c LJ |
66 | void *probes[0]; |
67 | }; | |
97e1c18e | 68 | |
19dba33c | 69 | static inline void *allocate_probes(int count) |
97e1c18e | 70 | { |
19dba33c LJ |
71 | struct tp_probes *p = kmalloc(count * sizeof(void *) |
72 | + sizeof(struct tp_probes), GFP_KERNEL); | |
73 | return p == NULL ? NULL : p->probes; | |
97e1c18e MD |
74 | } |
75 | ||
19dba33c | 76 | static void rcu_free_old_probes(struct rcu_head *head) |
97e1c18e | 77 | { |
127cafbb | 78 | kfree(container_of(head, struct tp_probes, u.rcu)); |
19dba33c LJ |
79 | } |
80 | ||
81 | static inline void release_probes(void *old) | |
82 | { | |
83 | if (old) { | |
84 | struct tp_probes *tp_probes = container_of(old, | |
85 | struct tp_probes, probes[0]); | |
127cafbb | 86 | call_rcu_sched(&tp_probes->u.rcu, rcu_free_old_probes); |
19dba33c | 87 | } |
97e1c18e MD |
88 | } |
89 | ||
90 | static void debug_print_probes(struct tracepoint_entry *entry) | |
91 | { | |
92 | int i; | |
93 | ||
19dba33c | 94 | if (!tracepoint_debug || !entry->funcs) |
97e1c18e MD |
95 | return; |
96 | ||
97 | for (i = 0; entry->funcs[i]; i++) | |
98 | printk(KERN_DEBUG "Probe %d : %p\n", i, entry->funcs[i]); | |
99 | } | |
100 | ||
101 | static void * | |
102 | tracepoint_entry_add_probe(struct tracepoint_entry *entry, void *probe) | |
103 | { | |
104 | int nr_probes = 0; | |
105 | void **old, **new; | |
106 | ||
107 | WARN_ON(!probe); | |
108 | ||
109 | debug_print_probes(entry); | |
110 | old = entry->funcs; | |
111 | if (old) { | |
112 | /* (N -> N+1), (N != 0, 1) probes */ | |
113 | for (nr_probes = 0; old[nr_probes]; nr_probes++) | |
114 | if (old[nr_probes] == probe) | |
115 | return ERR_PTR(-EEXIST); | |
116 | } | |
117 | /* + 2 : one for new probe, one for NULL func */ | |
19dba33c | 118 | new = allocate_probes(nr_probes + 2); |
97e1c18e MD |
119 | if (new == NULL) |
120 | return ERR_PTR(-ENOMEM); | |
121 | if (old) | |
122 | memcpy(new, old, nr_probes * sizeof(void *)); | |
123 | new[nr_probes] = probe; | |
19dba33c | 124 | new[nr_probes + 1] = NULL; |
97e1c18e MD |
125 | entry->refcount = nr_probes + 1; |
126 | entry->funcs = new; | |
127 | debug_print_probes(entry); | |
128 | return old; | |
129 | } | |
130 | ||
131 | static void * | |
132 | tracepoint_entry_remove_probe(struct tracepoint_entry *entry, void *probe) | |
133 | { | |
134 | int nr_probes = 0, nr_del = 0, i; | |
135 | void **old, **new; | |
136 | ||
137 | old = entry->funcs; | |
138 | ||
f66af459 | 139 | if (!old) |
19dba33c | 140 | return ERR_PTR(-ENOENT); |
f66af459 | 141 | |
97e1c18e MD |
142 | debug_print_probes(entry); |
143 | /* (N -> M), (N > 1, M >= 0) probes */ | |
144 | for (nr_probes = 0; old[nr_probes]; nr_probes++) { | |
145 | if ((!probe || old[nr_probes] == probe)) | |
146 | nr_del++; | |
147 | } | |
148 | ||
149 | if (nr_probes - nr_del == 0) { | |
150 | /* N -> 0, (N > 1) */ | |
151 | entry->funcs = NULL; | |
152 | entry->refcount = 0; | |
153 | debug_print_probes(entry); | |
154 | return old; | |
155 | } else { | |
156 | int j = 0; | |
157 | /* N -> M, (N > 1, M > 0) */ | |
158 | /* + 1 for NULL */ | |
19dba33c | 159 | new = allocate_probes(nr_probes - nr_del + 1); |
97e1c18e MD |
160 | if (new == NULL) |
161 | return ERR_PTR(-ENOMEM); | |
162 | for (i = 0; old[i]; i++) | |
163 | if ((probe && old[i] != probe)) | |
164 | new[j++] = old[i]; | |
19dba33c | 165 | new[nr_probes - nr_del] = NULL; |
97e1c18e MD |
166 | entry->refcount = nr_probes - nr_del; |
167 | entry->funcs = new; | |
168 | } | |
169 | debug_print_probes(entry); | |
170 | return old; | |
171 | } | |
172 | ||
173 | /* | |
174 | * Get tracepoint if the tracepoint is present in the tracepoint hash table. | |
175 | * Must be called with tracepoints_mutex held. | |
176 | * Returns NULL if not present. | |
177 | */ | |
178 | static struct tracepoint_entry *get_tracepoint(const char *name) | |
179 | { | |
180 | struct hlist_head *head; | |
181 | struct hlist_node *node; | |
182 | struct tracepoint_entry *e; | |
183 | u32 hash = jhash(name, strlen(name), 0); | |
184 | ||
9795302a | 185 | head = &tracepoint_table[hash & (TRACEPOINT_TABLE_SIZE - 1)]; |
97e1c18e MD |
186 | hlist_for_each_entry(e, node, head, hlist) { |
187 | if (!strcmp(name, e->name)) | |
188 | return e; | |
189 | } | |
190 | return NULL; | |
191 | } | |
192 | ||
193 | /* | |
194 | * Add the tracepoint to the tracepoint hash table. Must be called with | |
195 | * tracepoints_mutex held. | |
196 | */ | |
197 | static struct tracepoint_entry *add_tracepoint(const char *name) | |
198 | { | |
199 | struct hlist_head *head; | |
200 | struct hlist_node *node; | |
201 | struct tracepoint_entry *e; | |
202 | size_t name_len = strlen(name) + 1; | |
203 | u32 hash = jhash(name, name_len-1, 0); | |
204 | ||
9795302a | 205 | head = &tracepoint_table[hash & (TRACEPOINT_TABLE_SIZE - 1)]; |
97e1c18e MD |
206 | hlist_for_each_entry(e, node, head, hlist) { |
207 | if (!strcmp(name, e->name)) { | |
208 | printk(KERN_NOTICE | |
209 | "tracepoint %s busy\n", name); | |
210 | return ERR_PTR(-EEXIST); /* Already there */ | |
211 | } | |
212 | } | |
213 | /* | |
214 | * Using kmalloc here to allocate a variable length element. Could | |
215 | * cause some memory fragmentation if overused. | |
216 | */ | |
217 | e = kmalloc(sizeof(struct tracepoint_entry) + name_len, GFP_KERNEL); | |
218 | if (!e) | |
219 | return ERR_PTR(-ENOMEM); | |
220 | memcpy(&e->name[0], name, name_len); | |
221 | e->funcs = NULL; | |
222 | e->refcount = 0; | |
97e1c18e MD |
223 | hlist_add_head(&e->hlist, head); |
224 | return e; | |
225 | } | |
226 | ||
227 | /* | |
228 | * Remove the tracepoint from the tracepoint hash table. Must be called with | |
229 | * mutex_lock held. | |
230 | */ | |
19dba33c | 231 | static inline void remove_tracepoint(struct tracepoint_entry *e) |
97e1c18e | 232 | { |
97e1c18e | 233 | hlist_del(&e->hlist); |
97e1c18e | 234 | kfree(e); |
97e1c18e MD |
235 | } |
236 | ||
237 | /* | |
238 | * Sets the probe callback corresponding to one tracepoint. | |
239 | */ | |
240 | static void set_tracepoint(struct tracepoint_entry **entry, | |
241 | struct tracepoint *elem, int active) | |
242 | { | |
243 | WARN_ON(strcmp((*entry)->name, elem->name) != 0); | |
244 | ||
245 | /* | |
246 | * rcu_assign_pointer has a smp_wmb() which makes sure that the new | |
247 | * probe callbacks array is consistent before setting a pointer to it. | |
248 | * This array is referenced by __DO_TRACE from | |
249 | * include/linux/tracepoints.h. A matching smp_read_barrier_depends() | |
250 | * is used. | |
251 | */ | |
252 | rcu_assign_pointer(elem->funcs, (*entry)->funcs); | |
253 | elem->state = active; | |
254 | } | |
255 | ||
256 | /* | |
257 | * Disable a tracepoint and its probe callback. | |
258 | * Note: only waiting an RCU period after setting elem->call to the empty | |
259 | * function insures that the original callback is not used anymore. This insured | |
260 | * by preempt_disable around the call site. | |
261 | */ | |
262 | static void disable_tracepoint(struct tracepoint *elem) | |
263 | { | |
264 | elem->state = 0; | |
de0baf9a | 265 | rcu_assign_pointer(elem->funcs, NULL); |
97e1c18e MD |
266 | } |
267 | ||
268 | /** | |
269 | * tracepoint_update_probe_range - Update a probe range | |
270 | * @begin: beginning of the range | |
271 | * @end: end of the range | |
272 | * | |
273 | * Updates the probe callback corresponding to a range of tracepoints. | |
274 | */ | |
275 | void tracepoint_update_probe_range(struct tracepoint *begin, | |
276 | struct tracepoint *end) | |
277 | { | |
278 | struct tracepoint *iter; | |
279 | struct tracepoint_entry *mark_entry; | |
280 | ||
281 | mutex_lock(&tracepoints_mutex); | |
282 | for (iter = begin; iter < end; iter++) { | |
283 | mark_entry = get_tracepoint(iter->name); | |
284 | if (mark_entry) { | |
285 | set_tracepoint(&mark_entry, iter, | |
286 | !!mark_entry->refcount); | |
287 | } else { | |
288 | disable_tracepoint(iter); | |
289 | } | |
290 | } | |
291 | mutex_unlock(&tracepoints_mutex); | |
292 | } | |
293 | ||
294 | /* | |
295 | * Update probes, removing the faulty probes. | |
296 | */ | |
297 | static void tracepoint_update_probes(void) | |
298 | { | |
299 | /* Core kernel tracepoints */ | |
300 | tracepoint_update_probe_range(__start___tracepoints, | |
301 | __stop___tracepoints); | |
302 | /* tracepoints in modules. */ | |
303 | module_update_tracepoints(); | |
304 | } | |
305 | ||
127cafbb LJ |
306 | static void *tracepoint_add_probe(const char *name, void *probe) |
307 | { | |
308 | struct tracepoint_entry *entry; | |
309 | void *old; | |
310 | ||
311 | entry = get_tracepoint(name); | |
312 | if (!entry) { | |
313 | entry = add_tracepoint(name); | |
314 | if (IS_ERR(entry)) | |
315 | return entry; | |
316 | } | |
317 | old = tracepoint_entry_add_probe(entry, probe); | |
318 | if (IS_ERR(old) && !entry->refcount) | |
319 | remove_tracepoint(entry); | |
320 | return old; | |
321 | } | |
322 | ||
97e1c18e MD |
323 | /** |
324 | * tracepoint_probe_register - Connect a probe to a tracepoint | |
325 | * @name: tracepoint name | |
326 | * @probe: probe handler | |
327 | * | |
328 | * Returns 0 if ok, error value on error. | |
329 | * The probe address must at least be aligned on the architecture pointer size. | |
330 | */ | |
331 | int tracepoint_probe_register(const char *name, void *probe) | |
332 | { | |
97e1c18e MD |
333 | void *old; |
334 | ||
335 | mutex_lock(&tracepoints_mutex); | |
127cafbb | 336 | old = tracepoint_add_probe(name, probe); |
97e1c18e | 337 | mutex_unlock(&tracepoints_mutex); |
127cafbb LJ |
338 | if (IS_ERR(old)) |
339 | return PTR_ERR(old); | |
340 | ||
97e1c18e | 341 | tracepoint_update_probes(); /* may update entry */ |
19dba33c LJ |
342 | release_probes(old); |
343 | return 0; | |
97e1c18e MD |
344 | } |
345 | EXPORT_SYMBOL_GPL(tracepoint_probe_register); | |
346 | ||
127cafbb LJ |
347 | static void *tracepoint_remove_probe(const char *name, void *probe) |
348 | { | |
349 | struct tracepoint_entry *entry; | |
350 | void *old; | |
351 | ||
352 | entry = get_tracepoint(name); | |
353 | if (!entry) | |
354 | return ERR_PTR(-ENOENT); | |
355 | old = tracepoint_entry_remove_probe(entry, probe); | |
356 | if (IS_ERR(old)) | |
357 | return old; | |
358 | if (!entry->refcount) | |
359 | remove_tracepoint(entry); | |
360 | return old; | |
361 | } | |
362 | ||
97e1c18e MD |
363 | /** |
364 | * tracepoint_probe_unregister - Disconnect a probe from a tracepoint | |
365 | * @name: tracepoint name | |
366 | * @probe: probe function pointer | |
367 | * | |
368 | * We do not need to call a synchronize_sched to make sure the probes have | |
369 | * finished running before doing a module unload, because the module unload | |
370 | * itself uses stop_machine(), which insures that every preempt disabled section | |
371 | * have finished. | |
372 | */ | |
373 | int tracepoint_probe_unregister(const char *name, void *probe) | |
374 | { | |
97e1c18e | 375 | void *old; |
97e1c18e MD |
376 | |
377 | mutex_lock(&tracepoints_mutex); | |
127cafbb | 378 | old = tracepoint_remove_probe(name, probe); |
97e1c18e | 379 | mutex_unlock(&tracepoints_mutex); |
127cafbb LJ |
380 | if (IS_ERR(old)) |
381 | return PTR_ERR(old); | |
382 | ||
97e1c18e | 383 | tracepoint_update_probes(); /* may update entry */ |
19dba33c LJ |
384 | release_probes(old); |
385 | return 0; | |
97e1c18e MD |
386 | } |
387 | EXPORT_SYMBOL_GPL(tracepoint_probe_unregister); | |
388 | ||
127cafbb LJ |
389 | static LIST_HEAD(old_probes); |
390 | static int need_update; | |
391 | ||
392 | static void tracepoint_add_old_probes(void *old) | |
393 | { | |
394 | need_update = 1; | |
395 | if (old) { | |
396 | struct tp_probes *tp_probes = container_of(old, | |
397 | struct tp_probes, probes[0]); | |
398 | list_add(&tp_probes->u.list, &old_probes); | |
399 | } | |
400 | } | |
401 | ||
402 | /** | |
403 | * tracepoint_probe_register_noupdate - register a probe but not connect | |
404 | * @name: tracepoint name | |
405 | * @probe: probe handler | |
406 | * | |
407 | * caller must call tracepoint_probe_update_all() | |
408 | */ | |
409 | int tracepoint_probe_register_noupdate(const char *name, void *probe) | |
410 | { | |
411 | void *old; | |
412 | ||
413 | mutex_lock(&tracepoints_mutex); | |
414 | old = tracepoint_add_probe(name, probe); | |
415 | if (IS_ERR(old)) { | |
416 | mutex_unlock(&tracepoints_mutex); | |
417 | return PTR_ERR(old); | |
418 | } | |
419 | tracepoint_add_old_probes(old); | |
420 | mutex_unlock(&tracepoints_mutex); | |
421 | return 0; | |
422 | } | |
423 | EXPORT_SYMBOL_GPL(tracepoint_probe_register_noupdate); | |
424 | ||
425 | /** | |
426 | * tracepoint_probe_unregister_noupdate - remove a probe but not disconnect | |
427 | * @name: tracepoint name | |
428 | * @probe: probe function pointer | |
429 | * | |
430 | * caller must call tracepoint_probe_update_all() | |
431 | */ | |
432 | int tracepoint_probe_unregister_noupdate(const char *name, void *probe) | |
433 | { | |
434 | void *old; | |
435 | ||
436 | mutex_lock(&tracepoints_mutex); | |
437 | old = tracepoint_remove_probe(name, probe); | |
438 | if (IS_ERR(old)) { | |
439 | mutex_unlock(&tracepoints_mutex); | |
440 | return PTR_ERR(old); | |
441 | } | |
442 | tracepoint_add_old_probes(old); | |
443 | mutex_unlock(&tracepoints_mutex); | |
444 | return 0; | |
445 | } | |
446 | EXPORT_SYMBOL_GPL(tracepoint_probe_unregister_noupdate); | |
447 | ||
448 | /** | |
449 | * tracepoint_probe_update_all - update tracepoints | |
450 | */ | |
451 | void tracepoint_probe_update_all(void) | |
452 | { | |
453 | LIST_HEAD(release_probes); | |
454 | struct tp_probes *pos, *next; | |
455 | ||
456 | mutex_lock(&tracepoints_mutex); | |
457 | if (!need_update) { | |
458 | mutex_unlock(&tracepoints_mutex); | |
459 | return; | |
460 | } | |
461 | if (!list_empty(&old_probes)) | |
462 | list_replace_init(&old_probes, &release_probes); | |
463 | need_update = 0; | |
464 | mutex_unlock(&tracepoints_mutex); | |
465 | ||
466 | tracepoint_update_probes(); | |
467 | list_for_each_entry_safe(pos, next, &release_probes, u.list) { | |
468 | list_del(&pos->u.list); | |
469 | call_rcu_sched(&pos->u.rcu, rcu_free_old_probes); | |
470 | } | |
471 | } | |
472 | EXPORT_SYMBOL_GPL(tracepoint_probe_update_all); | |
473 | ||
97e1c18e MD |
474 | /** |
475 | * tracepoint_get_iter_range - Get a next tracepoint iterator given a range. | |
476 | * @tracepoint: current tracepoints (in), next tracepoint (out) | |
477 | * @begin: beginning of the range | |
478 | * @end: end of the range | |
479 | * | |
480 | * Returns whether a next tracepoint has been found (1) or not (0). | |
481 | * Will return the first tracepoint in the range if the input tracepoint is | |
482 | * NULL. | |
483 | */ | |
484 | int tracepoint_get_iter_range(struct tracepoint **tracepoint, | |
485 | struct tracepoint *begin, struct tracepoint *end) | |
486 | { | |
487 | if (!*tracepoint && begin != end) { | |
488 | *tracepoint = begin; | |
489 | return 1; | |
490 | } | |
491 | if (*tracepoint >= begin && *tracepoint < end) | |
492 | return 1; | |
493 | return 0; | |
494 | } | |
495 | EXPORT_SYMBOL_GPL(tracepoint_get_iter_range); | |
496 | ||
497 | static void tracepoint_get_iter(struct tracepoint_iter *iter) | |
498 | { | |
499 | int found = 0; | |
500 | ||
501 | /* Core kernel tracepoints */ | |
502 | if (!iter->module) { | |
503 | found = tracepoint_get_iter_range(&iter->tracepoint, | |
504 | __start___tracepoints, __stop___tracepoints); | |
505 | if (found) | |
506 | goto end; | |
507 | } | |
508 | /* tracepoints in modules. */ | |
509 | found = module_get_iter_tracepoints(iter); | |
510 | end: | |
511 | if (!found) | |
512 | tracepoint_iter_reset(iter); | |
513 | } | |
514 | ||
515 | void tracepoint_iter_start(struct tracepoint_iter *iter) | |
516 | { | |
517 | tracepoint_get_iter(iter); | |
518 | } | |
519 | EXPORT_SYMBOL_GPL(tracepoint_iter_start); | |
520 | ||
521 | void tracepoint_iter_next(struct tracepoint_iter *iter) | |
522 | { | |
523 | iter->tracepoint++; | |
524 | /* | |
525 | * iter->tracepoint may be invalid because we blindly incremented it. | |
526 | * Make sure it is valid by marshalling on the tracepoints, getting the | |
527 | * tracepoints from following modules if necessary. | |
528 | */ | |
529 | tracepoint_get_iter(iter); | |
530 | } | |
531 | EXPORT_SYMBOL_GPL(tracepoint_iter_next); | |
532 | ||
533 | void tracepoint_iter_stop(struct tracepoint_iter *iter) | |
534 | { | |
535 | } | |
536 | EXPORT_SYMBOL_GPL(tracepoint_iter_stop); | |
537 | ||
538 | void tracepoint_iter_reset(struct tracepoint_iter *iter) | |
539 | { | |
540 | iter->module = NULL; | |
541 | iter->tracepoint = NULL; | |
542 | } | |
543 | EXPORT_SYMBOL_GPL(tracepoint_iter_reset); | |
32f85742 | 544 | |
227a8375 IM |
545 | #ifdef CONFIG_MODULES |
546 | ||
32f85742 MD |
547 | int tracepoint_module_notify(struct notifier_block *self, |
548 | unsigned long val, void *data) | |
549 | { | |
550 | struct module *mod = data; | |
551 | ||
552 | switch (val) { | |
553 | case MODULE_STATE_COMING: | |
554 | tracepoint_update_probe_range(mod->tracepoints, | |
555 | mod->tracepoints + mod->num_tracepoints); | |
556 | break; | |
557 | case MODULE_STATE_GOING: | |
558 | tracepoint_update_probe_range(mod->tracepoints, | |
559 | mod->tracepoints + mod->num_tracepoints); | |
560 | break; | |
561 | } | |
562 | return 0; | |
563 | } | |
564 | ||
565 | struct notifier_block tracepoint_module_nb = { | |
566 | .notifier_call = tracepoint_module_notify, | |
567 | .priority = 0, | |
568 | }; | |
569 | ||
570 | static int init_tracepoints(void) | |
571 | { | |
572 | return register_module_notifier(&tracepoint_module_nb); | |
573 | } | |
574 | __initcall(init_tracepoints); | |
227a8375 IM |
575 | |
576 | #endif /* CONFIG_MODULES */ |