Commit | Line | Data |
---|---|---|
b77e38aa SR |
1 | /* |
2 | * event tracer | |
3 | * | |
4 | * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> | |
5 | * | |
981d081e SR |
6 | * - Added format output of fields of the trace point. |
7 | * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. | |
8 | * | |
b77e38aa SR |
9 | */ |
10 | ||
11 | #include <linux/debugfs.h> | |
12 | #include <linux/uaccess.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/ctype.h> | |
15 | ||
91729ef9 | 16 | #include "trace_output.h" |
b77e38aa | 17 | |
b628b3e6 SR |
18 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
19 | ||
11a241a3 SR |
20 | static DEFINE_MUTEX(event_mutex); |
21 | ||
cf027f64 TZ |
22 | int trace_define_field(struct ftrace_event_call *call, char *type, |
23 | char *name, int offset, int size) | |
24 | { | |
25 | struct ftrace_event_field *field; | |
26 | ||
27 | field = kmalloc(sizeof(*field), GFP_KERNEL); | |
28 | if (!field) | |
29 | goto err; | |
30 | field->name = kstrdup(name, GFP_KERNEL); | |
31 | if (!field->name) | |
32 | goto err; | |
33 | field->type = kstrdup(type, GFP_KERNEL); | |
34 | if (!field->type) | |
35 | goto err; | |
36 | field->offset = offset; | |
37 | field->size = size; | |
38 | list_add(&field->link, &call->fields); | |
39 | ||
40 | return 0; | |
41 | err: | |
42 | if (field) { | |
43 | kfree(field->name); | |
44 | kfree(field->type); | |
45 | } | |
46 | kfree(field); | |
47 | return -ENOMEM; | |
48 | } | |
49 | ||
b77e38aa SR |
50 | static void ftrace_clear_events(void) |
51 | { | |
52 | struct ftrace_event_call *call = (void *)__start_ftrace_events; | |
53 | ||
54 | ||
55 | while ((unsigned long)call < (unsigned long)__stop_ftrace_events) { | |
56 | ||
57 | if (call->enabled) { | |
58 | call->enabled = 0; | |
59 | call->unregfunc(); | |
60 | } | |
61 | call++; | |
62 | } | |
63 | } | |
64 | ||
fd994989 SR |
65 | static void ftrace_event_enable_disable(struct ftrace_event_call *call, |
66 | int enable) | |
67 | { | |
68 | ||
69 | switch (enable) { | |
70 | case 0: | |
71 | if (call->enabled) { | |
72 | call->enabled = 0; | |
73 | call->unregfunc(); | |
74 | } | |
fd994989 SR |
75 | break; |
76 | case 1: | |
da4d0302 | 77 | if (!call->enabled) { |
fd994989 SR |
78 | call->enabled = 1; |
79 | call->regfunc(); | |
80 | } | |
fd994989 SR |
81 | break; |
82 | } | |
83 | } | |
84 | ||
b77e38aa SR |
85 | static int ftrace_set_clr_event(char *buf, int set) |
86 | { | |
1473e441 | 87 | struct ftrace_event_call *call = __start_ftrace_events; |
b628b3e6 SR |
88 | char *event = NULL, *sub = NULL, *match; |
89 | int ret = -EINVAL; | |
90 | ||
91 | /* | |
92 | * The buf format can be <subsystem>:<event-name> | |
93 | * *:<event-name> means any event by that name. | |
94 | * :<event-name> is the same. | |
95 | * | |
96 | * <subsystem>:* means all events in that subsystem | |
97 | * <subsystem>: means the same. | |
98 | * | |
99 | * <name> (no ':') means all events in a subsystem with | |
100 | * the name <name> or any event that matches <name> | |
101 | */ | |
102 | ||
103 | match = strsep(&buf, ":"); | |
104 | if (buf) { | |
105 | sub = match; | |
106 | event = buf; | |
107 | match = NULL; | |
108 | ||
109 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
110 | sub = NULL; | |
111 | if (!strlen(event) || strcmp(event, "*") == 0) | |
112 | event = NULL; | |
113 | } | |
b77e38aa | 114 | |
11a241a3 | 115 | mutex_lock(&event_mutex); |
ac199db0 | 116 | for_each_event(call) { |
b77e38aa | 117 | |
40e26815 | 118 | if (!call->name || !call->regfunc) |
1473e441 SR |
119 | continue; |
120 | ||
b628b3e6 SR |
121 | if (match && |
122 | strcmp(match, call->name) != 0 && | |
123 | strcmp(match, call->system) != 0) | |
124 | continue; | |
125 | ||
126 | if (sub && strcmp(sub, call->system) != 0) | |
127 | continue; | |
128 | ||
129 | if (event && strcmp(event, call->name) != 0) | |
b77e38aa | 130 | continue; |
b77e38aa | 131 | |
fd994989 SR |
132 | ftrace_event_enable_disable(call, set); |
133 | ||
b628b3e6 | 134 | ret = 0; |
b77e38aa | 135 | } |
11a241a3 SR |
136 | mutex_unlock(&event_mutex); |
137 | ||
b628b3e6 | 138 | return ret; |
b77e38aa SR |
139 | } |
140 | ||
141 | /* 128 should be much more than enough */ | |
142 | #define EVENT_BUF_SIZE 127 | |
143 | ||
144 | static ssize_t | |
145 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
146 | size_t cnt, loff_t *ppos) | |
147 | { | |
148 | size_t read = 0; | |
149 | int i, set = 1; | |
150 | ssize_t ret; | |
151 | char *buf; | |
152 | char ch; | |
153 | ||
154 | if (!cnt || cnt < 0) | |
155 | return 0; | |
156 | ||
1852fcce SR |
157 | ret = tracing_update_buffers(); |
158 | if (ret < 0) | |
159 | return ret; | |
160 | ||
b77e38aa SR |
161 | ret = get_user(ch, ubuf++); |
162 | if (ret) | |
163 | return ret; | |
164 | read++; | |
165 | cnt--; | |
166 | ||
167 | /* skip white space */ | |
168 | while (cnt && isspace(ch)) { | |
169 | ret = get_user(ch, ubuf++); | |
170 | if (ret) | |
171 | return ret; | |
172 | read++; | |
173 | cnt--; | |
174 | } | |
175 | ||
176 | /* Only white space found? */ | |
177 | if (isspace(ch)) { | |
178 | file->f_pos += read; | |
179 | ret = read; | |
180 | return ret; | |
181 | } | |
182 | ||
183 | buf = kmalloc(EVENT_BUF_SIZE+1, GFP_KERNEL); | |
184 | if (!buf) | |
185 | return -ENOMEM; | |
186 | ||
187 | if (cnt > EVENT_BUF_SIZE) | |
188 | cnt = EVENT_BUF_SIZE; | |
189 | ||
190 | i = 0; | |
191 | while (cnt && !isspace(ch)) { | |
192 | if (!i && ch == '!') | |
193 | set = 0; | |
194 | else | |
195 | buf[i++] = ch; | |
196 | ||
197 | ret = get_user(ch, ubuf++); | |
198 | if (ret) | |
199 | goto out_free; | |
200 | read++; | |
201 | cnt--; | |
202 | } | |
203 | buf[i] = 0; | |
204 | ||
205 | file->f_pos += read; | |
206 | ||
207 | ret = ftrace_set_clr_event(buf, set); | |
208 | if (ret) | |
209 | goto out_free; | |
210 | ||
211 | ret = read; | |
212 | ||
213 | out_free: | |
214 | kfree(buf); | |
215 | ||
216 | return ret; | |
217 | } | |
218 | ||
219 | static void * | |
220 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
221 | { | |
222 | struct ftrace_event_call *call = m->private; | |
223 | struct ftrace_event_call *next = call; | |
224 | ||
225 | (*pos)++; | |
226 | ||
40e26815 SR |
227 | for (;;) { |
228 | if ((unsigned long)call >= (unsigned long)__stop_ftrace_events) | |
229 | return NULL; | |
230 | ||
231 | /* | |
232 | * The ftrace subsystem is for showing formats only. | |
233 | * They can not be enabled or disabled via the event files. | |
234 | */ | |
235 | if (call->regfunc) | |
236 | break; | |
237 | ||
238 | call++; | |
239 | next = call; | |
240 | } | |
b77e38aa SR |
241 | |
242 | m->private = ++next; | |
243 | ||
244 | return call; | |
245 | } | |
246 | ||
247 | static void *t_start(struct seq_file *m, loff_t *pos) | |
248 | { | |
249 | return t_next(m, NULL, pos); | |
250 | } | |
251 | ||
252 | static void * | |
253 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
254 | { | |
255 | struct ftrace_event_call *call = m->private; | |
256 | struct ftrace_event_call *next; | |
257 | ||
258 | (*pos)++; | |
259 | ||
260 | retry: | |
261 | if ((unsigned long)call >= (unsigned long)__stop_ftrace_events) | |
262 | return NULL; | |
263 | ||
264 | if (!call->enabled) { | |
265 | call++; | |
266 | goto retry; | |
267 | } | |
268 | ||
269 | next = call; | |
270 | m->private = ++next; | |
271 | ||
272 | return call; | |
273 | } | |
274 | ||
275 | static void *s_start(struct seq_file *m, loff_t *pos) | |
276 | { | |
277 | return s_next(m, NULL, pos); | |
278 | } | |
279 | ||
280 | static int t_show(struct seq_file *m, void *v) | |
281 | { | |
282 | struct ftrace_event_call *call = v; | |
283 | ||
b628b3e6 SR |
284 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
285 | seq_printf(m, "%s:", call->system); | |
b77e38aa SR |
286 | seq_printf(m, "%s\n", call->name); |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
291 | static void t_stop(struct seq_file *m, void *p) | |
292 | { | |
293 | } | |
294 | ||
295 | static int | |
296 | ftrace_event_seq_open(struct inode *inode, struct file *file) | |
297 | { | |
298 | int ret; | |
299 | const struct seq_operations *seq_ops; | |
300 | ||
301 | if ((file->f_mode & FMODE_WRITE) && | |
302 | !(file->f_flags & O_APPEND)) | |
303 | ftrace_clear_events(); | |
304 | ||
305 | seq_ops = inode->i_private; | |
306 | ret = seq_open(file, seq_ops); | |
307 | if (!ret) { | |
308 | struct seq_file *m = file->private_data; | |
309 | ||
310 | m->private = __start_ftrace_events; | |
311 | } | |
312 | return ret; | |
313 | } | |
314 | ||
1473e441 SR |
315 | static ssize_t |
316 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
317 | loff_t *ppos) | |
318 | { | |
319 | struct ftrace_event_call *call = filp->private_data; | |
320 | char *buf; | |
321 | ||
da4d0302 | 322 | if (call->enabled) |
1473e441 SR |
323 | buf = "1\n"; |
324 | else | |
325 | buf = "0\n"; | |
326 | ||
327 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
328 | } | |
329 | ||
330 | static ssize_t | |
331 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
332 | loff_t *ppos) | |
333 | { | |
334 | struct ftrace_event_call *call = filp->private_data; | |
335 | char buf[64]; | |
336 | unsigned long val; | |
337 | int ret; | |
338 | ||
339 | if (cnt >= sizeof(buf)) | |
340 | return -EINVAL; | |
341 | ||
342 | if (copy_from_user(&buf, ubuf, cnt)) | |
343 | return -EFAULT; | |
344 | ||
345 | buf[cnt] = 0; | |
346 | ||
347 | ret = strict_strtoul(buf, 10, &val); | |
348 | if (ret < 0) | |
349 | return ret; | |
350 | ||
1852fcce SR |
351 | ret = tracing_update_buffers(); |
352 | if (ret < 0) | |
353 | return ret; | |
354 | ||
1473e441 SR |
355 | switch (val) { |
356 | case 0: | |
1473e441 | 357 | case 1: |
11a241a3 | 358 | mutex_lock(&event_mutex); |
fd994989 | 359 | ftrace_event_enable_disable(call, val); |
11a241a3 | 360 | mutex_unlock(&event_mutex); |
1473e441 SR |
361 | break; |
362 | ||
363 | default: | |
364 | return -EINVAL; | |
365 | } | |
366 | ||
367 | *ppos += cnt; | |
368 | ||
369 | return cnt; | |
370 | } | |
371 | ||
91729ef9 | 372 | #undef FIELD |
156b5f17 | 373 | #define FIELD(type, name) \ |
cf027f64 TZ |
374 | #type, "common_" #name, offsetof(typeof(field), name), \ |
375 | sizeof(field.name) | |
91729ef9 SR |
376 | |
377 | static int trace_write_header(struct trace_seq *s) | |
378 | { | |
379 | struct trace_entry field; | |
380 | ||
381 | /* struct trace_entry */ | |
382 | return trace_seq_printf(s, | |
ce8eb2bf SR |
383 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" |
384 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
385 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
386 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
387 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
91729ef9 SR |
388 | "\n", |
389 | FIELD(unsigned char, type), | |
390 | FIELD(unsigned char, flags), | |
391 | FIELD(unsigned char, preempt_count), | |
392 | FIELD(int, pid), | |
393 | FIELD(int, tgid)); | |
394 | } | |
da4d0302 | 395 | |
981d081e SR |
396 | static ssize_t |
397 | event_format_read(struct file *filp, char __user *ubuf, size_t cnt, | |
398 | loff_t *ppos) | |
399 | { | |
400 | struct ftrace_event_call *call = filp->private_data; | |
401 | struct trace_seq *s; | |
402 | char *buf; | |
403 | int r; | |
404 | ||
c269fc8c TZ |
405 | if (*ppos) |
406 | return 0; | |
407 | ||
981d081e SR |
408 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
409 | if (!s) | |
410 | return -ENOMEM; | |
411 | ||
412 | trace_seq_init(s); | |
413 | ||
c5e4e192 SR |
414 | /* If any of the first writes fail, so will the show_format. */ |
415 | ||
416 | trace_seq_printf(s, "name: %s\n", call->name); | |
417 | trace_seq_printf(s, "ID: %d\n", call->id); | |
418 | trace_seq_printf(s, "format:\n"); | |
91729ef9 SR |
419 | trace_write_header(s); |
420 | ||
981d081e SR |
421 | r = call->show_format(s); |
422 | if (!r) { | |
423 | /* | |
424 | * ug! The format output is bigger than a PAGE!! | |
425 | */ | |
426 | buf = "FORMAT TOO BIG\n"; | |
427 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
428 | buf, strlen(buf)); | |
429 | goto out; | |
430 | } | |
431 | ||
432 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
433 | s->buffer, s->len); | |
434 | out: | |
435 | kfree(s); | |
436 | return r; | |
437 | } | |
438 | ||
23725aee PZ |
439 | static ssize_t |
440 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
441 | { | |
442 | struct ftrace_event_call *call = filp->private_data; | |
443 | struct trace_seq *s; | |
444 | int r; | |
445 | ||
446 | if (*ppos) | |
447 | return 0; | |
448 | ||
449 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
450 | if (!s) | |
451 | return -ENOMEM; | |
452 | ||
453 | trace_seq_init(s); | |
454 | trace_seq_printf(s, "%d\n", call->id); | |
455 | ||
456 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
457 | s->buffer, s->len); | |
458 | kfree(s); | |
459 | return r; | |
460 | } | |
461 | ||
b77e38aa SR |
462 | static const struct seq_operations show_event_seq_ops = { |
463 | .start = t_start, | |
464 | .next = t_next, | |
465 | .show = t_show, | |
466 | .stop = t_stop, | |
467 | }; | |
468 | ||
469 | static const struct seq_operations show_set_event_seq_ops = { | |
470 | .start = s_start, | |
471 | .next = s_next, | |
472 | .show = t_show, | |
473 | .stop = t_stop, | |
474 | }; | |
475 | ||
2314c4ae SR |
476 | static const struct file_operations ftrace_avail_fops = { |
477 | .open = ftrace_event_seq_open, | |
478 | .read = seq_read, | |
479 | .llseek = seq_lseek, | |
480 | .release = seq_release, | |
481 | }; | |
482 | ||
b77e38aa SR |
483 | static const struct file_operations ftrace_set_event_fops = { |
484 | .open = ftrace_event_seq_open, | |
485 | .read = seq_read, | |
486 | .write = ftrace_event_write, | |
487 | .llseek = seq_lseek, | |
488 | .release = seq_release, | |
489 | }; | |
490 | ||
1473e441 SR |
491 | static const struct file_operations ftrace_enable_fops = { |
492 | .open = tracing_open_generic, | |
493 | .read = event_enable_read, | |
494 | .write = event_enable_write, | |
495 | }; | |
496 | ||
981d081e SR |
497 | static const struct file_operations ftrace_event_format_fops = { |
498 | .open = tracing_open_generic, | |
499 | .read = event_format_read, | |
500 | }; | |
501 | ||
23725aee PZ |
502 | static const struct file_operations ftrace_event_id_fops = { |
503 | .open = tracing_open_generic, | |
504 | .read = event_id_read, | |
505 | }; | |
506 | ||
1473e441 SR |
507 | static struct dentry *event_trace_events_dir(void) |
508 | { | |
509 | static struct dentry *d_tracer; | |
510 | static struct dentry *d_events; | |
511 | ||
512 | if (d_events) | |
513 | return d_events; | |
514 | ||
515 | d_tracer = tracing_init_dentry(); | |
516 | if (!d_tracer) | |
517 | return NULL; | |
518 | ||
519 | d_events = debugfs_create_dir("events", d_tracer); | |
520 | if (!d_events) | |
521 | pr_warning("Could not create debugfs " | |
522 | "'events' directory\n"); | |
523 | ||
524 | return d_events; | |
525 | } | |
526 | ||
6ecc2d1c SR |
527 | struct event_subsystem { |
528 | struct list_head list; | |
529 | const char *name; | |
530 | struct dentry *entry; | |
531 | }; | |
532 | ||
533 | static LIST_HEAD(event_subsystems); | |
534 | ||
535 | static struct dentry * | |
536 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
537 | { | |
538 | struct event_subsystem *system; | |
539 | ||
540 | /* First see if we did not already create this dir */ | |
541 | list_for_each_entry(system, &event_subsystems, list) { | |
542 | if (strcmp(system->name, name) == 0) | |
543 | return system->entry; | |
544 | } | |
545 | ||
546 | /* need to create new entry */ | |
547 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
548 | if (!system) { | |
549 | pr_warning("No memory to create event subsystem %s\n", | |
550 | name); | |
551 | return d_events; | |
552 | } | |
553 | ||
554 | system->entry = debugfs_create_dir(name, d_events); | |
555 | if (!system->entry) { | |
556 | pr_warning("Could not create event subsystem %s\n", | |
557 | name); | |
558 | kfree(system); | |
559 | return d_events; | |
560 | } | |
561 | ||
562 | system->name = name; | |
563 | list_add(&system->list, &event_subsystems); | |
564 | ||
565 | return system->entry; | |
566 | } | |
567 | ||
1473e441 SR |
568 | static int |
569 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events) | |
570 | { | |
571 | struct dentry *entry; | |
fd994989 | 572 | int ret; |
1473e441 | 573 | |
6ecc2d1c SR |
574 | /* |
575 | * If the trace point header did not define TRACE_SYSTEM | |
576 | * then the system would be called "TRACE_SYSTEM". | |
577 | */ | |
578 | if (strcmp(call->system, "TRACE_SYSTEM") != 0) | |
579 | d_events = event_subsystem_dir(call->system, d_events); | |
580 | ||
fd994989 SR |
581 | if (call->raw_init) { |
582 | ret = call->raw_init(); | |
583 | if (ret < 0) { | |
584 | pr_warning("Could not initialize trace point" | |
585 | " events/%s\n", call->name); | |
586 | return ret; | |
587 | } | |
588 | } | |
589 | ||
1473e441 SR |
590 | call->dir = debugfs_create_dir(call->name, d_events); |
591 | if (!call->dir) { | |
592 | pr_warning("Could not create debugfs " | |
593 | "'%s' directory\n", call->name); | |
594 | return -1; | |
595 | } | |
596 | ||
770cb243 SR |
597 | if (call->regfunc) { |
598 | entry = debugfs_create_file("enable", 0644, call->dir, call, | |
599 | &ftrace_enable_fops); | |
600 | if (!entry) | |
601 | pr_warning("Could not create debugfs " | |
602 | "'%s/enable' entry\n", call->name); | |
603 | } | |
1473e441 | 604 | |
23725aee PZ |
605 | if (call->id) { |
606 | entry = debugfs_create_file("id", 0444, call->dir, call, | |
607 | &ftrace_event_id_fops); | |
608 | if (!entry) | |
609 | pr_warning("Could not create debugfs '%s/id' entry\n", | |
610 | call->name); | |
611 | } | |
612 | ||
cf027f64 TZ |
613 | if (call->define_fields) { |
614 | ret = call->define_fields(); | |
615 | if (ret < 0) { | |
616 | pr_warning("Could not initialize trace point" | |
617 | " events/%s\n", call->name); | |
618 | return ret; | |
619 | } | |
620 | } | |
621 | ||
981d081e SR |
622 | /* A trace may not want to export its format */ |
623 | if (!call->show_format) | |
624 | return 0; | |
625 | ||
626 | entry = debugfs_create_file("format", 0444, call->dir, call, | |
627 | &ftrace_event_format_fops); | |
628 | if (!entry) | |
629 | pr_warning("Could not create debugfs " | |
630 | "'%s/format' entry\n", call->name); | |
fd994989 | 631 | |
1473e441 SR |
632 | return 0; |
633 | } | |
634 | ||
b77e38aa SR |
635 | static __init int event_trace_init(void) |
636 | { | |
1473e441 | 637 | struct ftrace_event_call *call = __start_ftrace_events; |
b77e38aa SR |
638 | struct dentry *d_tracer; |
639 | struct dentry *entry; | |
1473e441 | 640 | struct dentry *d_events; |
b77e38aa SR |
641 | |
642 | d_tracer = tracing_init_dentry(); | |
643 | if (!d_tracer) | |
644 | return 0; | |
645 | ||
2314c4ae SR |
646 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
647 | (void *)&show_event_seq_ops, | |
648 | &ftrace_avail_fops); | |
649 | if (!entry) | |
650 | pr_warning("Could not create debugfs " | |
651 | "'available_events' entry\n"); | |
652 | ||
b77e38aa SR |
653 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
654 | (void *)&show_set_event_seq_ops, | |
655 | &ftrace_set_event_fops); | |
656 | if (!entry) | |
657 | pr_warning("Could not create debugfs " | |
658 | "'set_event' entry\n"); | |
659 | ||
1473e441 SR |
660 | d_events = event_trace_events_dir(); |
661 | if (!d_events) | |
662 | return 0; | |
663 | ||
ac199db0 | 664 | for_each_event(call) { |
1473e441 SR |
665 | /* The linker may leave blanks */ |
666 | if (!call->name) | |
667 | continue; | |
668 | event_create_dir(call, d_events); | |
669 | } | |
670 | ||
b77e38aa SR |
671 | return 0; |
672 | } | |
673 | fs_initcall(event_trace_init); |