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[mirror_ubuntu-focal-kernel.git] / kernel / locking / lockdep_proc.c
1 /*
2 * kernel/lockdep_proc.c
3 *
4 * Runtime locking correctness validator
5 *
6 * Started by Ingo Molnar:
7 *
8 * Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
9 * Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra
10 *
11 * Code for /proc/lockdep and /proc/lockdep_stats:
12 *
13 */
14 #include <linux/export.h>
15 #include <linux/proc_fs.h>
16 #include <linux/seq_file.h>
17 #include <linux/kallsyms.h>
18 #include <linux/debug_locks.h>
19 #include <linux/vmalloc.h>
20 #include <linux/sort.h>
21 #include <linux/uaccess.h>
22 #include <asm/div64.h>
23
24 #include "lockdep_internals.h"
25
26 static void *l_next(struct seq_file *m, void *v, loff_t *pos)
27 {
28 return seq_list_next(v, &all_lock_classes, pos);
29 }
30
31 static void *l_start(struct seq_file *m, loff_t *pos)
32 {
33 return seq_list_start_head(&all_lock_classes, *pos);
34 }
35
36 static void l_stop(struct seq_file *m, void *v)
37 {
38 }
39
40 static void print_name(struct seq_file *m, struct lock_class *class)
41 {
42 char str[KSYM_NAME_LEN];
43 const char *name = class->name;
44
45 if (!name) {
46 name = __get_key_name(class->key, str);
47 seq_printf(m, "%s", name);
48 } else{
49 seq_printf(m, "%s", name);
50 if (class->name_version > 1)
51 seq_printf(m, "#%d", class->name_version);
52 if (class->subclass)
53 seq_printf(m, "/%d", class->subclass);
54 }
55 }
56
57 static int l_show(struct seq_file *m, void *v)
58 {
59 struct lock_class *class = list_entry(v, struct lock_class, lock_entry);
60 struct lock_list *entry;
61 char usage[LOCK_USAGE_CHARS];
62
63 if (v == &all_lock_classes) {
64 seq_printf(m, "all lock classes:\n");
65 return 0;
66 }
67
68 seq_printf(m, "%p", class->key);
69 #ifdef CONFIG_DEBUG_LOCKDEP
70 seq_printf(m, " OPS:%8ld", class->ops);
71 #endif
72 #ifdef CONFIG_PROVE_LOCKING
73 seq_printf(m, " FD:%5ld", lockdep_count_forward_deps(class));
74 seq_printf(m, " BD:%5ld", lockdep_count_backward_deps(class));
75 #endif
76
77 get_usage_chars(class, usage);
78 seq_printf(m, " %s", usage);
79
80 seq_printf(m, ": ");
81 print_name(m, class);
82 seq_puts(m, "\n");
83
84 list_for_each_entry(entry, &class->locks_after, entry) {
85 if (entry->distance == 1) {
86 seq_printf(m, " -> [%p] ", entry->class->key);
87 print_name(m, entry->class);
88 seq_puts(m, "\n");
89 }
90 }
91 seq_puts(m, "\n");
92
93 return 0;
94 }
95
96 static const struct seq_operations lockdep_ops = {
97 .start = l_start,
98 .next = l_next,
99 .stop = l_stop,
100 .show = l_show,
101 };
102
103 static int lockdep_open(struct inode *inode, struct file *file)
104 {
105 return seq_open(file, &lockdep_ops);
106 }
107
108 static const struct file_operations proc_lockdep_operations = {
109 .open = lockdep_open,
110 .read = seq_read,
111 .llseek = seq_lseek,
112 .release = seq_release,
113 };
114
115 #ifdef CONFIG_PROVE_LOCKING
116 static void *lc_start(struct seq_file *m, loff_t *pos)
117 {
118 if (*pos == 0)
119 return SEQ_START_TOKEN;
120
121 if (*pos - 1 < nr_lock_chains)
122 return lock_chains + (*pos - 1);
123
124 return NULL;
125 }
126
127 static void *lc_next(struct seq_file *m, void *v, loff_t *pos)
128 {
129 (*pos)++;
130 return lc_start(m, pos);
131 }
132
133 static void lc_stop(struct seq_file *m, void *v)
134 {
135 }
136
137 static int lc_show(struct seq_file *m, void *v)
138 {
139 struct lock_chain *chain = v;
140 struct lock_class *class;
141 int i;
142
143 if (v == SEQ_START_TOKEN) {
144 if (nr_chain_hlocks > MAX_LOCKDEP_CHAIN_HLOCKS)
145 seq_printf(m, "(buggered) ");
146 seq_printf(m, "all lock chains:\n");
147 return 0;
148 }
149
150 seq_printf(m, "irq_context: %d\n", chain->irq_context);
151
152 for (i = 0; i < chain->depth; i++) {
153 class = lock_chain_get_class(chain, i);
154 if (!class->key)
155 continue;
156
157 seq_printf(m, "[%p] ", class->key);
158 print_name(m, class);
159 seq_puts(m, "\n");
160 }
161 seq_puts(m, "\n");
162
163 return 0;
164 }
165
166 static const struct seq_operations lockdep_chains_ops = {
167 .start = lc_start,
168 .next = lc_next,
169 .stop = lc_stop,
170 .show = lc_show,
171 };
172
173 static int lockdep_chains_open(struct inode *inode, struct file *file)
174 {
175 return seq_open(file, &lockdep_chains_ops);
176 }
177
178 static const struct file_operations proc_lockdep_chains_operations = {
179 .open = lockdep_chains_open,
180 .read = seq_read,
181 .llseek = seq_lseek,
182 .release = seq_release,
183 };
184 #endif /* CONFIG_PROVE_LOCKING */
185
186 static void lockdep_stats_debug_show(struct seq_file *m)
187 {
188 #ifdef CONFIG_DEBUG_LOCKDEP
189 unsigned long long hi1 = debug_atomic_read(hardirqs_on_events),
190 hi2 = debug_atomic_read(hardirqs_off_events),
191 hr1 = debug_atomic_read(redundant_hardirqs_on),
192 hr2 = debug_atomic_read(redundant_hardirqs_off),
193 si1 = debug_atomic_read(softirqs_on_events),
194 si2 = debug_atomic_read(softirqs_off_events),
195 sr1 = debug_atomic_read(redundant_softirqs_on),
196 sr2 = debug_atomic_read(redundant_softirqs_off);
197
198 seq_printf(m, " chain lookup misses: %11llu\n",
199 debug_atomic_read(chain_lookup_misses));
200 seq_printf(m, " chain lookup hits: %11llu\n",
201 debug_atomic_read(chain_lookup_hits));
202 seq_printf(m, " cyclic checks: %11llu\n",
203 debug_atomic_read(nr_cyclic_checks));
204 seq_printf(m, " redundant checks: %11llu\n",
205 debug_atomic_read(nr_redundant_checks));
206 seq_printf(m, " redundant links: %11llu\n",
207 debug_atomic_read(nr_redundant));
208 seq_printf(m, " find-mask forwards checks: %11llu\n",
209 debug_atomic_read(nr_find_usage_forwards_checks));
210 seq_printf(m, " find-mask backwards checks: %11llu\n",
211 debug_atomic_read(nr_find_usage_backwards_checks));
212
213 seq_printf(m, " hardirq on events: %11llu\n", hi1);
214 seq_printf(m, " hardirq off events: %11llu\n", hi2);
215 seq_printf(m, " redundant hardirq ons: %11llu\n", hr1);
216 seq_printf(m, " redundant hardirq offs: %11llu\n", hr2);
217 seq_printf(m, " softirq on events: %11llu\n", si1);
218 seq_printf(m, " softirq off events: %11llu\n", si2);
219 seq_printf(m, " redundant softirq ons: %11llu\n", sr1);
220 seq_printf(m, " redundant softirq offs: %11llu\n", sr2);
221 #endif
222 }
223
224 static int lockdep_stats_show(struct seq_file *m, void *v)
225 {
226 struct lock_class *class;
227 unsigned long nr_unused = 0, nr_uncategorized = 0,
228 nr_irq_safe = 0, nr_irq_unsafe = 0,
229 nr_softirq_safe = 0, nr_softirq_unsafe = 0,
230 nr_hardirq_safe = 0, nr_hardirq_unsafe = 0,
231 nr_irq_read_safe = 0, nr_irq_read_unsafe = 0,
232 nr_softirq_read_safe = 0, nr_softirq_read_unsafe = 0,
233 nr_hardirq_read_safe = 0, nr_hardirq_read_unsafe = 0,
234 sum_forward_deps = 0;
235
236 list_for_each_entry(class, &all_lock_classes, lock_entry) {
237
238 if (class->usage_mask == 0)
239 nr_unused++;
240 if (class->usage_mask == LOCKF_USED)
241 nr_uncategorized++;
242 if (class->usage_mask & LOCKF_USED_IN_IRQ)
243 nr_irq_safe++;
244 if (class->usage_mask & LOCKF_ENABLED_IRQ)
245 nr_irq_unsafe++;
246 if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ)
247 nr_softirq_safe++;
248 if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ)
249 nr_softirq_unsafe++;
250 if (class->usage_mask & LOCKF_USED_IN_HARDIRQ)
251 nr_hardirq_safe++;
252 if (class->usage_mask & LOCKF_ENABLED_HARDIRQ)
253 nr_hardirq_unsafe++;
254 if (class->usage_mask & LOCKF_USED_IN_IRQ_READ)
255 nr_irq_read_safe++;
256 if (class->usage_mask & LOCKF_ENABLED_IRQ_READ)
257 nr_irq_read_unsafe++;
258 if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ)
259 nr_softirq_read_safe++;
260 if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ_READ)
261 nr_softirq_read_unsafe++;
262 if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ)
263 nr_hardirq_read_safe++;
264 if (class->usage_mask & LOCKF_ENABLED_HARDIRQ_READ)
265 nr_hardirq_read_unsafe++;
266
267 #ifdef CONFIG_PROVE_LOCKING
268 sum_forward_deps += lockdep_count_forward_deps(class);
269 #endif
270 }
271 #ifdef CONFIG_DEBUG_LOCKDEP
272 DEBUG_LOCKS_WARN_ON(debug_atomic_read(nr_unused_locks) != nr_unused);
273 #endif
274 seq_printf(m, " lock-classes: %11lu [max: %lu]\n",
275 nr_lock_classes, MAX_LOCKDEP_KEYS);
276 seq_printf(m, " direct dependencies: %11lu [max: %lu]\n",
277 nr_list_entries, MAX_LOCKDEP_ENTRIES);
278 seq_printf(m, " indirect dependencies: %11lu\n",
279 sum_forward_deps);
280
281 /*
282 * Total number of dependencies:
283 *
284 * All irq-safe locks may nest inside irq-unsafe locks,
285 * plus all the other known dependencies:
286 */
287 seq_printf(m, " all direct dependencies: %11lu\n",
288 nr_irq_unsafe * nr_irq_safe +
289 nr_hardirq_unsafe * nr_hardirq_safe +
290 nr_list_entries);
291
292 #ifdef CONFIG_PROVE_LOCKING
293 seq_printf(m, " dependency chains: %11lu [max: %lu]\n",
294 nr_lock_chains, MAX_LOCKDEP_CHAINS);
295 seq_printf(m, " dependency chain hlocks: %11d [max: %lu]\n",
296 nr_chain_hlocks, MAX_LOCKDEP_CHAIN_HLOCKS);
297 #endif
298
299 #ifdef CONFIG_TRACE_IRQFLAGS
300 seq_printf(m, " in-hardirq chains: %11u\n",
301 nr_hardirq_chains);
302 seq_printf(m, " in-softirq chains: %11u\n",
303 nr_softirq_chains);
304 #endif
305 seq_printf(m, " in-process chains: %11u\n",
306 nr_process_chains);
307 seq_printf(m, " stack-trace entries: %11lu [max: %lu]\n",
308 nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES);
309 seq_printf(m, " combined max dependencies: %11u\n",
310 (nr_hardirq_chains + 1) *
311 (nr_softirq_chains + 1) *
312 (nr_process_chains + 1)
313 );
314 seq_printf(m, " hardirq-safe locks: %11lu\n",
315 nr_hardirq_safe);
316 seq_printf(m, " hardirq-unsafe locks: %11lu\n",
317 nr_hardirq_unsafe);
318 seq_printf(m, " softirq-safe locks: %11lu\n",
319 nr_softirq_safe);
320 seq_printf(m, " softirq-unsafe locks: %11lu\n",
321 nr_softirq_unsafe);
322 seq_printf(m, " irq-safe locks: %11lu\n",
323 nr_irq_safe);
324 seq_printf(m, " irq-unsafe locks: %11lu\n",
325 nr_irq_unsafe);
326
327 seq_printf(m, " hardirq-read-safe locks: %11lu\n",
328 nr_hardirq_read_safe);
329 seq_printf(m, " hardirq-read-unsafe locks: %11lu\n",
330 nr_hardirq_read_unsafe);
331 seq_printf(m, " softirq-read-safe locks: %11lu\n",
332 nr_softirq_read_safe);
333 seq_printf(m, " softirq-read-unsafe locks: %11lu\n",
334 nr_softirq_read_unsafe);
335 seq_printf(m, " irq-read-safe locks: %11lu\n",
336 nr_irq_read_safe);
337 seq_printf(m, " irq-read-unsafe locks: %11lu\n",
338 nr_irq_read_unsafe);
339
340 seq_printf(m, " uncategorized locks: %11lu\n",
341 nr_uncategorized);
342 seq_printf(m, " unused locks: %11lu\n",
343 nr_unused);
344 seq_printf(m, " max locking depth: %11u\n",
345 max_lockdep_depth);
346 #ifdef CONFIG_PROVE_LOCKING
347 seq_printf(m, " max bfs queue depth: %11u\n",
348 max_bfs_queue_depth);
349 #endif
350 lockdep_stats_debug_show(m);
351 seq_printf(m, " debug_locks: %11u\n",
352 debug_locks);
353
354 return 0;
355 }
356
357 static int lockdep_stats_open(struct inode *inode, struct file *file)
358 {
359 return single_open(file, lockdep_stats_show, NULL);
360 }
361
362 static const struct file_operations proc_lockdep_stats_operations = {
363 .open = lockdep_stats_open,
364 .read = seq_read,
365 .llseek = seq_lseek,
366 .release = single_release,
367 };
368
369 #ifdef CONFIG_LOCK_STAT
370
371 struct lock_stat_data {
372 struct lock_class *class;
373 struct lock_class_stats stats;
374 };
375
376 struct lock_stat_seq {
377 struct lock_stat_data *iter_end;
378 struct lock_stat_data stats[MAX_LOCKDEP_KEYS];
379 };
380
381 /*
382 * sort on absolute number of contentions
383 */
384 static int lock_stat_cmp(const void *l, const void *r)
385 {
386 const struct lock_stat_data *dl = l, *dr = r;
387 unsigned long nl, nr;
388
389 nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr;
390 nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr;
391
392 return nr - nl;
393 }
394
395 static void seq_line(struct seq_file *m, char c, int offset, int length)
396 {
397 int i;
398
399 for (i = 0; i < offset; i++)
400 seq_puts(m, " ");
401 for (i = 0; i < length; i++)
402 seq_printf(m, "%c", c);
403 seq_puts(m, "\n");
404 }
405
406 static void snprint_time(char *buf, size_t bufsiz, s64 nr)
407 {
408 s64 div;
409 s32 rem;
410
411 nr += 5; /* for display rounding */
412 div = div_s64_rem(nr, 1000, &rem);
413 snprintf(buf, bufsiz, "%lld.%02d", (long long)div, (int)rem/10);
414 }
415
416 static void seq_time(struct seq_file *m, s64 time)
417 {
418 char num[15];
419
420 snprint_time(num, sizeof(num), time);
421 seq_printf(m, " %14s", num);
422 }
423
424 static void seq_lock_time(struct seq_file *m, struct lock_time *lt)
425 {
426 seq_printf(m, "%14lu", lt->nr);
427 seq_time(m, lt->min);
428 seq_time(m, lt->max);
429 seq_time(m, lt->total);
430 seq_time(m, lt->nr ? div_s64(lt->total, lt->nr) : 0);
431 }
432
433 static void seq_stats(struct seq_file *m, struct lock_stat_data *data)
434 {
435 struct lockdep_subclass_key *ckey;
436 struct lock_class_stats *stats;
437 struct lock_class *class;
438 const char *cname;
439 int i, namelen;
440 char name[39];
441
442 class = data->class;
443 stats = &data->stats;
444
445 namelen = 38;
446 if (class->name_version > 1)
447 namelen -= 2; /* XXX truncates versions > 9 */
448 if (class->subclass)
449 namelen -= 2;
450
451 rcu_read_lock_sched();
452 cname = rcu_dereference_sched(class->name);
453 ckey = rcu_dereference_sched(class->key);
454
455 if (!cname && !ckey) {
456 rcu_read_unlock_sched();
457 return;
458
459 } else if (!cname) {
460 char str[KSYM_NAME_LEN];
461 const char *key_name;
462
463 key_name = __get_key_name(ckey, str);
464 snprintf(name, namelen, "%s", key_name);
465 } else {
466 snprintf(name, namelen, "%s", cname);
467 }
468 rcu_read_unlock_sched();
469
470 namelen = strlen(name);
471 if (class->name_version > 1) {
472 snprintf(name+namelen, 3, "#%d", class->name_version);
473 namelen += 2;
474 }
475 if (class->subclass) {
476 snprintf(name+namelen, 3, "/%d", class->subclass);
477 namelen += 2;
478 }
479
480 if (stats->write_holdtime.nr) {
481 if (stats->read_holdtime.nr)
482 seq_printf(m, "%38s-W:", name);
483 else
484 seq_printf(m, "%40s:", name);
485
486 seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]);
487 seq_lock_time(m, &stats->write_waittime);
488 seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]);
489 seq_lock_time(m, &stats->write_holdtime);
490 seq_puts(m, "\n");
491 }
492
493 if (stats->read_holdtime.nr) {
494 seq_printf(m, "%38s-R:", name);
495 seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]);
496 seq_lock_time(m, &stats->read_waittime);
497 seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]);
498 seq_lock_time(m, &stats->read_holdtime);
499 seq_puts(m, "\n");
500 }
501
502 if (stats->read_waittime.nr + stats->write_waittime.nr == 0)
503 return;
504
505 if (stats->read_holdtime.nr)
506 namelen += 2;
507
508 for (i = 0; i < LOCKSTAT_POINTS; i++) {
509 char ip[32];
510
511 if (class->contention_point[i] == 0)
512 break;
513
514 if (!i)
515 seq_line(m, '-', 40-namelen, namelen);
516
517 snprintf(ip, sizeof(ip), "[<%p>]",
518 (void *)class->contention_point[i]);
519 seq_printf(m, "%40s %14lu %29s %pS\n",
520 name, stats->contention_point[i],
521 ip, (void *)class->contention_point[i]);
522 }
523 for (i = 0; i < LOCKSTAT_POINTS; i++) {
524 char ip[32];
525
526 if (class->contending_point[i] == 0)
527 break;
528
529 if (!i)
530 seq_line(m, '-', 40-namelen, namelen);
531
532 snprintf(ip, sizeof(ip), "[<%p>]",
533 (void *)class->contending_point[i]);
534 seq_printf(m, "%40s %14lu %29s %pS\n",
535 name, stats->contending_point[i],
536 ip, (void *)class->contending_point[i]);
537 }
538 if (i) {
539 seq_puts(m, "\n");
540 seq_line(m, '.', 0, 40 + 1 + 12 * (14 + 1));
541 seq_puts(m, "\n");
542 }
543 }
544
545 static void seq_header(struct seq_file *m)
546 {
547 seq_puts(m, "lock_stat version 0.4\n");
548
549 if (unlikely(!debug_locks))
550 seq_printf(m, "*WARNING* lock debugging disabled!! - possibly due to a lockdep warning\n");
551
552 seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1));
553 seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s %14s %14s "
554 "%14s %14s\n",
555 "class name",
556 "con-bounces",
557 "contentions",
558 "waittime-min",
559 "waittime-max",
560 "waittime-total",
561 "waittime-avg",
562 "acq-bounces",
563 "acquisitions",
564 "holdtime-min",
565 "holdtime-max",
566 "holdtime-total",
567 "holdtime-avg");
568 seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1));
569 seq_printf(m, "\n");
570 }
571
572 static void *ls_start(struct seq_file *m, loff_t *pos)
573 {
574 struct lock_stat_seq *data = m->private;
575 struct lock_stat_data *iter;
576
577 if (*pos == 0)
578 return SEQ_START_TOKEN;
579
580 iter = data->stats + (*pos - 1);
581 if (iter >= data->iter_end)
582 iter = NULL;
583
584 return iter;
585 }
586
587 static void *ls_next(struct seq_file *m, void *v, loff_t *pos)
588 {
589 (*pos)++;
590 return ls_start(m, pos);
591 }
592
593 static void ls_stop(struct seq_file *m, void *v)
594 {
595 }
596
597 static int ls_show(struct seq_file *m, void *v)
598 {
599 if (v == SEQ_START_TOKEN)
600 seq_header(m);
601 else
602 seq_stats(m, v);
603
604 return 0;
605 }
606
607 static const struct seq_operations lockstat_ops = {
608 .start = ls_start,
609 .next = ls_next,
610 .stop = ls_stop,
611 .show = ls_show,
612 };
613
614 static int lock_stat_open(struct inode *inode, struct file *file)
615 {
616 int res;
617 struct lock_class *class;
618 struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq));
619
620 if (!data)
621 return -ENOMEM;
622
623 res = seq_open(file, &lockstat_ops);
624 if (!res) {
625 struct lock_stat_data *iter = data->stats;
626 struct seq_file *m = file->private_data;
627
628 list_for_each_entry(class, &all_lock_classes, lock_entry) {
629 iter->class = class;
630 iter->stats = lock_stats(class);
631 iter++;
632 }
633 data->iter_end = iter;
634
635 sort(data->stats, data->iter_end - data->stats,
636 sizeof(struct lock_stat_data),
637 lock_stat_cmp, NULL);
638
639 m->private = data;
640 } else
641 vfree(data);
642
643 return res;
644 }
645
646 static ssize_t lock_stat_write(struct file *file, const char __user *buf,
647 size_t count, loff_t *ppos)
648 {
649 struct lock_class *class;
650 char c;
651
652 if (count) {
653 if (get_user(c, buf))
654 return -EFAULT;
655
656 if (c != '0')
657 return count;
658
659 list_for_each_entry(class, &all_lock_classes, lock_entry)
660 clear_lock_stats(class);
661 }
662 return count;
663 }
664
665 static int lock_stat_release(struct inode *inode, struct file *file)
666 {
667 struct seq_file *seq = file->private_data;
668
669 vfree(seq->private);
670 return seq_release(inode, file);
671 }
672
673 static const struct file_operations proc_lock_stat_operations = {
674 .open = lock_stat_open,
675 .write = lock_stat_write,
676 .read = seq_read,
677 .llseek = seq_lseek,
678 .release = lock_stat_release,
679 };
680 #endif /* CONFIG_LOCK_STAT */
681
682 static int __init lockdep_proc_init(void)
683 {
684 proc_create("lockdep", S_IRUSR, NULL, &proc_lockdep_operations);
685 #ifdef CONFIG_PROVE_LOCKING
686 proc_create("lockdep_chains", S_IRUSR, NULL,
687 &proc_lockdep_chains_operations);
688 #endif
689 proc_create("lockdep_stats", S_IRUSR, NULL,
690 &proc_lockdep_stats_operations);
691
692 #ifdef CONFIG_LOCK_STAT
693 proc_create("lock_stat", S_IRUSR | S_IWUSR, NULL,
694 &proc_lock_stat_operations);
695 #endif
696
697 return 0;
698 }
699
700 __initcall(lockdep_proc_init);
701
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