?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 4.9.199
[linux/fpc-iii.git] / kernel / locking / lockdep_proc.c
blob75d80809c48c902e7b6010f73dbb389782d663d1
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 <asm/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, " find-mask forwards checks: %11llu\n",
205 debug_atomic_read(nr_find_usage_forwards_checks));
206 seq_printf(m, " find-mask backwards checks: %11llu\n",
207 debug_atomic_read(nr_find_usage_backwards_checks));
208
209 seq_printf(m, " hardirq on events: %11llu\n", hi1);
210 seq_printf(m, " hardirq off events: %11llu\n", hi2);
211 seq_printf(m, " redundant hardirq ons: %11llu\n", hr1);
212 seq_printf(m, " redundant hardirq offs: %11llu\n", hr2);
213 seq_printf(m, " softirq on events: %11llu\n", si1);
214 seq_printf(m, " softirq off events: %11llu\n", si2);
215 seq_printf(m, " redundant softirq ons: %11llu\n", sr1);
216 seq_printf(m, " redundant softirq offs: %11llu\n", sr2);
217 #endif
218 }
219
220 static int lockdep_stats_show(struct seq_file *m, void *v)
221 {
222 unsigned long nr_unused = 0, nr_uncategorized = 0,
223 nr_irq_safe = 0, nr_irq_unsafe = 0,
224 nr_softirq_safe = 0, nr_softirq_unsafe = 0,
225 nr_hardirq_safe = 0, nr_hardirq_unsafe = 0,
226 nr_irq_read_safe = 0, nr_irq_read_unsafe = 0,
227 nr_softirq_read_safe = 0, nr_softirq_read_unsafe = 0,
228 nr_hardirq_read_safe = 0, nr_hardirq_read_unsafe = 0,
229 sum_forward_deps = 0;
230
231 #ifdef CONFIG_PROVE_LOCKING
232 struct lock_class *class;
233
234 list_for_each_entry(class, &all_lock_classes, lock_entry) {
235
236 if (class->usage_mask == 0)
237 nr_unused++;
238 if (class->usage_mask == LOCKF_USED)
239 nr_uncategorized++;
240 if (class->usage_mask & LOCKF_USED_IN_IRQ)
241 nr_irq_safe++;
242 if (class->usage_mask & LOCKF_ENABLED_IRQ)
243 nr_irq_unsafe++;
244 if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ)
245 nr_softirq_safe++;
246 if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ)
247 nr_softirq_unsafe++;
248 if (class->usage_mask & LOCKF_USED_IN_HARDIRQ)
249 nr_hardirq_safe++;
250 if (class->usage_mask & LOCKF_ENABLED_HARDIRQ)
251 nr_hardirq_unsafe++;
252 if (class->usage_mask & LOCKF_USED_IN_IRQ_READ)
253 nr_irq_read_safe++;
254 if (class->usage_mask & LOCKF_ENABLED_IRQ_READ)
255 nr_irq_read_unsafe++;
256 if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ)
257 nr_softirq_read_safe++;
258 if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ_READ)
259 nr_softirq_read_unsafe++;
260 if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ)
261 nr_hardirq_read_safe++;
262 if (class->usage_mask & LOCKF_ENABLED_HARDIRQ_READ)
263 nr_hardirq_read_unsafe++;
264
265 sum_forward_deps += lockdep_count_forward_deps(class);
266 }
267 #ifdef CONFIG_DEBUG_LOCKDEP
268 DEBUG_LOCKS_WARN_ON(debug_atomic_read(nr_unused_locks) != nr_unused);
269 #endif
270
271 #endif
272 seq_printf(m, " lock-classes: %11lu [max: %lu]\n",
273 nr_lock_classes, MAX_LOCKDEP_KEYS);
274 seq_printf(m, " direct dependencies: %11lu [max: %lu]\n",
275 nr_list_entries, MAX_LOCKDEP_ENTRIES);
276 seq_printf(m, " indirect dependencies: %11lu\n",
277 sum_forward_deps);
278
279 /*
280 * Total number of dependencies:
281 *
282 * All irq-safe locks may nest inside irq-unsafe locks,
283 * plus all the other known dependencies:
284 */
285 seq_printf(m, " all direct dependencies: %11lu\n",
286 nr_irq_unsafe * nr_irq_safe +
287 nr_hardirq_unsafe * nr_hardirq_safe +
288 nr_list_entries);
289
290 #ifdef CONFIG_PROVE_LOCKING
291 seq_printf(m, " dependency chains: %11lu [max: %lu]\n",
292 nr_lock_chains, MAX_LOCKDEP_CHAINS);
293 seq_printf(m, " dependency chain hlocks: %11d [max: %lu]\n",
294 nr_chain_hlocks, MAX_LOCKDEP_CHAIN_HLOCKS);
295 #endif
296
297 #ifdef CONFIG_TRACE_IRQFLAGS
298 seq_printf(m, " in-hardirq chains: %11u\n",
299 nr_hardirq_chains);
300 seq_printf(m, " in-softirq chains: %11u\n",
301 nr_softirq_chains);
302 #endif
303 seq_printf(m, " in-process chains: %11u\n",
304 nr_process_chains);
305 seq_printf(m, " stack-trace entries: %11lu [max: %lu]\n",
306 nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES);
307 seq_printf(m, " combined max dependencies: %11u\n",
308 (nr_hardirq_chains + 1) *
309 (nr_softirq_chains + 1) *
310 (nr_process_chains + 1)
311 );
312 seq_printf(m, " hardirq-safe locks: %11lu\n",
313 nr_hardirq_safe);
314 seq_printf(m, " hardirq-unsafe locks: %11lu\n",
315 nr_hardirq_unsafe);
316 seq_printf(m, " softirq-safe locks: %11lu\n",
317 nr_softirq_safe);
318 seq_printf(m, " softirq-unsafe locks: %11lu\n",
319 nr_softirq_unsafe);
320 seq_printf(m, " irq-safe locks: %11lu\n",
321 nr_irq_safe);
322 seq_printf(m, " irq-unsafe locks: %11lu\n",
323 nr_irq_unsafe);
324
325 seq_printf(m, " hardirq-read-safe locks: %11lu\n",
326 nr_hardirq_read_safe);
327 seq_printf(m, " hardirq-read-unsafe locks: %11lu\n",
328 nr_hardirq_read_unsafe);
329 seq_printf(m, " softirq-read-safe locks: %11lu\n",
330 nr_softirq_read_safe);
331 seq_printf(m, " softirq-read-unsafe locks: %11lu\n",
332 nr_softirq_read_unsafe);
333 seq_printf(m, " irq-read-safe locks: %11lu\n",
334 nr_irq_read_safe);
335 seq_printf(m, " irq-read-unsafe locks: %11lu\n",
336 nr_irq_read_unsafe);
337
338 seq_printf(m, " uncategorized locks: %11lu\n",
339 nr_uncategorized);
340 seq_printf(m, " unused locks: %11lu\n",
341 nr_unused);
342 seq_printf(m, " max locking depth: %11u\n",
343 max_lockdep_depth);
344 #ifdef CONFIG_PROVE_LOCKING
345 seq_printf(m, " max bfs queue depth: %11u\n",
346 max_bfs_queue_depth);
347 #endif
348 lockdep_stats_debug_show(m);
349 seq_printf(m, " debug_locks: %11u\n",
350 debug_locks);
351
352 return 0;
353 }
354
355 static int lockdep_stats_open(struct inode *inode, struct file *file)
356 {
357 return single_open(file, lockdep_stats_show, NULL);
358 }
359
360 static const struct file_operations proc_lockdep_stats_operations = {
361 .open = lockdep_stats_open,
362 .read = seq_read,
363 .llseek = seq_lseek,
364 .release = single_release,
365 };
366
367 #ifdef CONFIG_LOCK_STAT
368
369 struct lock_stat_data {
370 struct lock_class *class;
371 struct lock_class_stats stats;
372 };
373
374 struct lock_stat_seq {
375 struct lock_stat_data *iter_end;
376 struct lock_stat_data stats[MAX_LOCKDEP_KEYS];
377 };
378
379 /*
380 * sort on absolute number of contentions
381 */
382 static int lock_stat_cmp(const void *l, const void *r)
383 {
384 const struct lock_stat_data *dl = l, *dr = r;
385 unsigned long nl, nr;
386
387 nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr;
388 nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr;
389
390 return nr - nl;
391 }
392
393 static void seq_line(struct seq_file *m, char c, int offset, int length)
394 {
395 int i;
396
397 for (i = 0; i < offset; i++)
398 seq_puts(m, " ");
399 for (i = 0; i < length; i++)
400 seq_printf(m, "%c", c);
401 seq_puts(m, "\n");
402 }
403
404 static void snprint_time(char *buf, size_t bufsiz, s64 nr)
405 {
406 s64 div;
407 s32 rem;
408
409 nr += 5; /* for display rounding */
410 div = div_s64_rem(nr, 1000, &rem);
411 snprintf(buf, bufsiz, "%lld.%02d", (long long)div, (int)rem/10);
412 }
413
414 static void seq_time(struct seq_file *m, s64 time)
415 {
416 char num[15];
417
418 snprint_time(num, sizeof(num), time);
419 seq_printf(m, " %14s", num);
420 }
421
422 static void seq_lock_time(struct seq_file *m, struct lock_time *lt)
423 {
424 seq_printf(m, "%14lu", lt->nr);
425 seq_time(m, lt->min);
426 seq_time(m, lt->max);
427 seq_time(m, lt->total);
428 seq_time(m, lt->nr ? div_s64(lt->total, lt->nr) : 0);
429 }
430
431 static void seq_stats(struct seq_file *m, struct lock_stat_data *data)
432 {
433 struct lockdep_subclass_key *ckey;
434 struct lock_class_stats *stats;
435 struct lock_class *class;
436 const char *cname;
437 int i, namelen;
438 char name[39];
439
440 class = data->class;
441 stats = &data->stats;
442
443 namelen = 38;
444 if (class->name_version > 1)
445 namelen -= 2; /* XXX truncates versions > 9 */
446 if (class->subclass)
447 namelen -= 2;
448
449 rcu_read_lock_sched();
450 cname = rcu_dereference_sched(class->name);
451 ckey = rcu_dereference_sched(class->key);
452
453 if (!cname && !ckey) {
454 rcu_read_unlock_sched();
455 return;
456
457 } else if (!cname) {
458 char str[KSYM_NAME_LEN];
459 const char *key_name;
460
461 key_name = __get_key_name(ckey, str);
462 snprintf(name, namelen, "%s", key_name);
463 } else {
464 snprintf(name, namelen, "%s", cname);
465 }
466 rcu_read_unlock_sched();
467
468 namelen = strlen(name);
469 if (class->name_version > 1) {
470 snprintf(name+namelen, 3, "#%d", class->name_version);
471 namelen += 2;
472 }
473 if (class->subclass) {
474 snprintf(name+namelen, 3, "/%d", class->subclass);
475 namelen += 2;
476 }
477
478 if (stats->write_holdtime.nr) {
479 if (stats->read_holdtime.nr)
480 seq_printf(m, "%38s-W:", name);
481 else
482 seq_printf(m, "%40s:", name);
483
484 seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]);
485 seq_lock_time(m, &stats->write_waittime);
486 seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]);
487 seq_lock_time(m, &stats->write_holdtime);
488 seq_puts(m, "\n");
489 }
490
491 if (stats->read_holdtime.nr) {
492 seq_printf(m, "%38s-R:", name);
493 seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]);
494 seq_lock_time(m, &stats->read_waittime);
495 seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]);
496 seq_lock_time(m, &stats->read_holdtime);
497 seq_puts(m, "\n");
498 }
499
500 if (stats->read_waittime.nr + stats->write_waittime.nr == 0)
501 return;
502
503 if (stats->read_holdtime.nr)
504 namelen += 2;
505
506 for (i = 0; i < LOCKSTAT_POINTS; i++) {
507 char ip[32];
508
509 if (class->contention_point[i] == 0)
510 break;
511
512 if (!i)
513 seq_line(m, '-', 40-namelen, namelen);
514
515 snprintf(ip, sizeof(ip), "[<%p>]",
516 (void *)class->contention_point[i]);
517 seq_printf(m, "%40s %14lu %29s %pS\n",
518 name, stats->contention_point[i],
519 ip, (void *)class->contention_point[i]);
520 }
521 for (i = 0; i < LOCKSTAT_POINTS; i++) {
522 char ip[32];
523
524 if (class->contending_point[i] == 0)
525 break;
526
527 if (!i)
528 seq_line(m, '-', 40-namelen, namelen);
529
530 snprintf(ip, sizeof(ip), "[<%p>]",
531 (void *)class->contending_point[i]);
532 seq_printf(m, "%40s %14lu %29s %pS\n",
533 name, stats->contending_point[i],
534 ip, (void *)class->contending_point[i]);
535 }
536 if (i) {
537 seq_puts(m, "\n");
538 seq_line(m, '.', 0, 40 + 1 + 12 * (14 + 1));
539 seq_puts(m, "\n");
540 }
541 }
542
543 static void seq_header(struct seq_file *m)
544 {
545 seq_puts(m, "lock_stat version 0.4\n");
546
547 if (unlikely(!debug_locks))
548 seq_printf(m, "*WARNING* lock debugging disabled!! - possibly due to a lockdep warning\n");
549
550 seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1));
551 seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s %14s %14s "
552 "%14s %14s\n",
553 "class name",
554 "con-bounces",
555 "contentions",
556 "waittime-min",
557 "waittime-max",
558 "waittime-total",
559 "waittime-avg",
560 "acq-bounces",
561 "acquisitions",
562 "holdtime-min",
563 "holdtime-max",
564 "holdtime-total",
565 "holdtime-avg");
566 seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1));
567 seq_printf(m, "\n");
568 }
569
570 static void *ls_start(struct seq_file *m, loff_t *pos)
571 {
572 struct lock_stat_seq *data = m->private;
573 struct lock_stat_data *iter;
574
575 if (*pos == 0)
576 return SEQ_START_TOKEN;
577
578 iter = data->stats + (*pos - 1);
579 if (iter >= data->iter_end)
580 iter = NULL;
581
582 return iter;
583 }
584
585 static void *ls_next(struct seq_file *m, void *v, loff_t *pos)
586 {
587 (*pos)++;
588 return ls_start(m, pos);
589 }
590
591 static void ls_stop(struct seq_file *m, void *v)
592 {
593 }
594
595 static int ls_show(struct seq_file *m, void *v)
596 {
597 if (v == SEQ_START_TOKEN)
598 seq_header(m);
599 else
600 seq_stats(m, v);
601
602 return 0;
603 }
604
605 static const struct seq_operations lockstat_ops = {
606 .start = ls_start,
607 .next = ls_next,
608 .stop = ls_stop,
609 .show = ls_show,
610 };
611
612 static int lock_stat_open(struct inode *inode, struct file *file)
613 {
614 int res;
615 struct lock_class *class;
616 struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq));
617
618 if (!data)
619 return -ENOMEM;
620
621 res = seq_open(file, &lockstat_ops);
622 if (!res) {
623 struct lock_stat_data *iter = data->stats;
624 struct seq_file *m = file->private_data;
625
626 list_for_each_entry(class, &all_lock_classes, lock_entry) {
627 iter->class = class;
628 iter->stats = lock_stats(class);
629 iter++;
630 }
631 data->iter_end = iter;
632
633 sort(data->stats, data->iter_end - data->stats,
634 sizeof(struct lock_stat_data),
635 lock_stat_cmp, NULL);
636
637 m->private = data;
638 } else
639 vfree(data);
640
641 return res;
642 }
643
644 static ssize_t lock_stat_write(struct file *file, const char __user *buf,
645 size_t count, loff_t *ppos)
646 {
647 struct lock_class *class;
648 char c;
649
650 if (count) {
651 if (get_user(c, buf))
652 return -EFAULT;
653
654 if (c != '0')
655 return count;
656
657 list_for_each_entry(class, &all_lock_classes, lock_entry)
658 clear_lock_stats(class);
659 }
660 return count;
661 }
662
663 static int lock_stat_release(struct inode *inode, struct file *file)
664 {
665 struct seq_file *seq = file->private_data;
666
667 vfree(seq->private);
668 return seq_release(inode, file);
669 }
670
671 static const struct file_operations proc_lock_stat_operations = {
672 .open = lock_stat_open,
673 .write = lock_stat_write,
674 .read = seq_read,
675 .llseek = seq_lseek,
676 .release = lock_stat_release,
677 };
678 #endif /* CONFIG_LOCK_STAT */
679
680 static int __init lockdep_proc_init(void)
681 {
682 proc_create("lockdep", S_IRUSR, NULL, &proc_lockdep_operations);
683 #ifdef CONFIG_PROVE_LOCKING
684 proc_create("lockdep_chains", S_IRUSR, NULL,
685 &proc_lockdep_chains_operations);
686 #endif
687 proc_create("lockdep_stats", S_IRUSR, NULL,
688 &proc_lockdep_stats_operations);
689
690 #ifdef CONFIG_LOCK_STAT
691 proc_create("lock_stat", S_IRUSR | S_IWUSR, NULL,
692 &proc_lock_stat_operations);
693 #endif
694
695 return 0;
696 }
697
698 __initcall(lockdep_proc_init);
699
Linux with added FPC-III support