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TOMOYO Linux Cross Reference
Linux/kernel/locking/lockdep_proc.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * kernel/lockdep_proc.c
  4  *
  5  * Runtime locking correctness validator
  6  *
  7  * Started by Ingo Molnar:
  8  *
  9  *  Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
 10  *  Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra
 11  *
 12  * Code for /proc/lockdep and /proc/lockdep_stats:
 13  *
 14  */
 15 #include <linux/export.h>
 16 #include <linux/proc_fs.h>
 17 #include <linux/seq_file.h>
 18 #include <linux/kallsyms.h>
 19 #include <linux/debug_locks.h>
 20 #include <linux/vmalloc.h>
 21 #include <linux/sort.h>
 22 #include <linux/uaccess.h>
 23 #include <asm/div64.h>
 24 
 25 #include "lockdep_internals.h"
 26 
 27 static void *l_next(struct seq_file *m, void *v, loff_t *pos)
 28 {
 29         return seq_list_next(v, &all_lock_classes, pos);
 30 }
 31 
 32 static void *l_start(struct seq_file *m, loff_t *pos)
 33 {
 34         return seq_list_start_head(&all_lock_classes, *pos);
 35 }
 36 
 37 static void l_stop(struct seq_file *m, void *v)
 38 {
 39 }
 40 
 41 static void print_name(struct seq_file *m, struct lock_class *class)
 42 {
 43         char str[KSYM_NAME_LEN];
 44         const char *name = class->name;
 45 
 46         if (!name) {
 47                 name = __get_key_name(class->key, str);
 48                 seq_printf(m, "%s", name);
 49         } else{
 50                 seq_printf(m, "%s", name);
 51                 if (class->name_version > 1)
 52                         seq_printf(m, "#%d", class->name_version);
 53                 if (class->subclass)
 54                         seq_printf(m, "/%d", class->subclass);
 55         }
 56 }
 57 
 58 static int l_show(struct seq_file *m, void *v)
 59 {
 60         struct lock_class *class = list_entry(v, struct lock_class, lock_entry);
 61         struct lock_list *entry;
 62         char usage[LOCK_USAGE_CHARS];
 63 
 64         if (v == &all_lock_classes) {
 65                 seq_printf(m, "all lock classes:\n");
 66                 return 0;
 67         }
 68 
 69         seq_printf(m, "%p", class->key);
 70 #ifdef CONFIG_DEBUG_LOCKDEP
 71         seq_printf(m, " OPS:%8ld", debug_class_ops_read(class));
 72 #endif
 73 #ifdef CONFIG_PROVE_LOCKING
 74         seq_printf(m, " FD:%5ld", lockdep_count_forward_deps(class));
 75         seq_printf(m, " BD:%5ld", lockdep_count_backward_deps(class));
 76 #endif
 77 
 78         get_usage_chars(class, usage);
 79         seq_printf(m, " %s", usage);
 80 
 81         seq_printf(m, ": ");
 82         print_name(m, class);
 83         seq_puts(m, "\n");
 84 
 85         list_for_each_entry(entry, &class->locks_after, entry) {
 86                 if (entry->distance == 1) {
 87                         seq_printf(m, " -> [%p] ", entry->class->key);
 88                         print_name(m, entry->class);
 89                         seq_puts(m, "\n");
 90                 }
 91         }
 92         seq_puts(m, "\n");
 93 
 94         return 0;
 95 }
 96 
 97 static const struct seq_operations lockdep_ops = {
 98         .start  = l_start,
 99         .next   = l_next,
100         .stop   = l_stop,
101         .show   = l_show,
102 };
103 
104 #ifdef CONFIG_PROVE_LOCKING
105 static void *lc_start(struct seq_file *m, loff_t *pos)
106 {
107         if (*pos < 0)
108                 return NULL;
109 
110         if (*pos == 0)
111                 return SEQ_START_TOKEN;
112 
113         return lock_chains + (*pos - 1);
114 }
115 
116 static void *lc_next(struct seq_file *m, void *v, loff_t *pos)
117 {
118         *pos = lockdep_next_lockchain(*pos - 1) + 1;
119         return lc_start(m, pos);
120 }
121 
122 static void lc_stop(struct seq_file *m, void *v)
123 {
124 }
125 
126 static int lc_show(struct seq_file *m, void *v)
127 {
128         struct lock_chain *chain = v;
129         struct lock_class *class;
130         int i;
131 
132         if (v == SEQ_START_TOKEN) {
133                 if (nr_chain_hlocks > MAX_LOCKDEP_CHAIN_HLOCKS)
134                         seq_printf(m, "(buggered) ");
135                 seq_printf(m, "all lock chains:\n");
136                 return 0;
137         }
138 
139         seq_printf(m, "irq_context: %d\n", chain->irq_context);
140 
141         for (i = 0; i < chain->depth; i++) {
142                 class = lock_chain_get_class(chain, i);
143                 if (!class->key)
144                         continue;
145 
146                 seq_printf(m, "[%p] ", class->key);
147                 print_name(m, class);
148                 seq_puts(m, "\n");
149         }
150         seq_puts(m, "\n");
151 
152         return 0;
153 }
154 
155 static const struct seq_operations lockdep_chains_ops = {
156         .start  = lc_start,
157         .next   = lc_next,
158         .stop   = lc_stop,
159         .show   = lc_show,
160 };
161 #endif /* CONFIG_PROVE_LOCKING */
162 
163 static void lockdep_stats_debug_show(struct seq_file *m)
164 {
165 #ifdef CONFIG_DEBUG_LOCKDEP
166         unsigned long long hi1 = debug_atomic_read(hardirqs_on_events),
167                            hi2 = debug_atomic_read(hardirqs_off_events),
168                            hr1 = debug_atomic_read(redundant_hardirqs_on),
169                            hr2 = debug_atomic_read(redundant_hardirqs_off),
170                            si1 = debug_atomic_read(softirqs_on_events),
171                            si2 = debug_atomic_read(softirqs_off_events),
172                            sr1 = debug_atomic_read(redundant_softirqs_on),
173                            sr2 = debug_atomic_read(redundant_softirqs_off);
174 
175         seq_printf(m, " chain lookup misses:           %11llu\n",
176                 debug_atomic_read(chain_lookup_misses));
177         seq_printf(m, " chain lookup hits:             %11llu\n",
178                 debug_atomic_read(chain_lookup_hits));
179         seq_printf(m, " cyclic checks:                 %11llu\n",
180                 debug_atomic_read(nr_cyclic_checks));
181         seq_printf(m, " redundant checks:              %11llu\n",
182                 debug_atomic_read(nr_redundant_checks));
183         seq_printf(m, " redundant links:               %11llu\n",
184                 debug_atomic_read(nr_redundant));
185         seq_printf(m, " find-mask forwards checks:     %11llu\n",
186                 debug_atomic_read(nr_find_usage_forwards_checks));
187         seq_printf(m, " find-mask backwards checks:    %11llu\n",
188                 debug_atomic_read(nr_find_usage_backwards_checks));
189 
190         seq_printf(m, " hardirq on events:             %11llu\n", hi1);
191         seq_printf(m, " hardirq off events:            %11llu\n", hi2);
192         seq_printf(m, " redundant hardirq ons:         %11llu\n", hr1);
193         seq_printf(m, " redundant hardirq offs:        %11llu\n", hr2);
194         seq_printf(m, " softirq on events:             %11llu\n", si1);
195         seq_printf(m, " softirq off events:            %11llu\n", si2);
196         seq_printf(m, " redundant softirq ons:         %11llu\n", sr1);
197         seq_printf(m, " redundant softirq offs:        %11llu\n", sr2);
198 #endif
199 }
200 
201 static int lockdep_stats_show(struct seq_file *m, void *v)
202 {
203         unsigned long nr_unused = 0, nr_uncategorized = 0,
204                       nr_irq_safe = 0, nr_irq_unsafe = 0,
205                       nr_softirq_safe = 0, nr_softirq_unsafe = 0,
206                       nr_hardirq_safe = 0, nr_hardirq_unsafe = 0,
207                       nr_irq_read_safe = 0, nr_irq_read_unsafe = 0,
208                       nr_softirq_read_safe = 0, nr_softirq_read_unsafe = 0,
209                       nr_hardirq_read_safe = 0, nr_hardirq_read_unsafe = 0,
210                       sum_forward_deps = 0;
211 
212 #ifdef CONFIG_PROVE_LOCKING
213         struct lock_class *class;
214 
215         list_for_each_entry(class, &all_lock_classes, lock_entry) {
216 
217                 if (class->usage_mask == 0)
218                         nr_unused++;
219                 if (class->usage_mask == LOCKF_USED)
220                         nr_uncategorized++;
221                 if (class->usage_mask & LOCKF_USED_IN_IRQ)
222                         nr_irq_safe++;
223                 if (class->usage_mask & LOCKF_ENABLED_IRQ)
224                         nr_irq_unsafe++;
225                 if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ)
226                         nr_softirq_safe++;
227                 if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ)
228                         nr_softirq_unsafe++;
229                 if (class->usage_mask & LOCKF_USED_IN_HARDIRQ)
230                         nr_hardirq_safe++;
231                 if (class->usage_mask & LOCKF_ENABLED_HARDIRQ)
232                         nr_hardirq_unsafe++;
233                 if (class->usage_mask & LOCKF_USED_IN_IRQ_READ)
234                         nr_irq_read_safe++;
235                 if (class->usage_mask & LOCKF_ENABLED_IRQ_READ)
236                         nr_irq_read_unsafe++;
237                 if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ)
238                         nr_softirq_read_safe++;
239                 if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ_READ)
240                         nr_softirq_read_unsafe++;
241                 if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ)
242                         nr_hardirq_read_safe++;
243                 if (class->usage_mask & LOCKF_ENABLED_HARDIRQ_READ)
244                         nr_hardirq_read_unsafe++;
245 
246                 sum_forward_deps += lockdep_count_forward_deps(class);
247         }
248 #ifdef CONFIG_DEBUG_LOCKDEP
249         DEBUG_LOCKS_WARN_ON(debug_atomic_read(nr_unused_locks) != nr_unused);
250 #endif
251 
252 #endif
253         seq_printf(m, " lock-classes:                  %11lu [max: %lu]\n",
254                         nr_lock_classes, MAX_LOCKDEP_KEYS);
255         seq_printf(m, " direct dependencies:           %11lu [max: %lu]\n",
256                         nr_list_entries, MAX_LOCKDEP_ENTRIES);
257         seq_printf(m, " indirect dependencies:         %11lu\n",
258                         sum_forward_deps);
259 
260         /*
261          * Total number of dependencies:
262          *
263          * All irq-safe locks may nest inside irq-unsafe locks,
264          * plus all the other known dependencies:
265          */
266         seq_printf(m, " all direct dependencies:       %11lu\n",
267                         nr_irq_unsafe * nr_irq_safe +
268                         nr_hardirq_unsafe * nr_hardirq_safe +
269                         nr_list_entries);
270 
271 #ifdef CONFIG_PROVE_LOCKING
272         seq_printf(m, " dependency chains:             %11lu [max: %lu]\n",
273                         lock_chain_count(), MAX_LOCKDEP_CHAINS);
274         seq_printf(m, " dependency chain hlocks:       %11d [max: %lu]\n",
275                         nr_chain_hlocks, MAX_LOCKDEP_CHAIN_HLOCKS);
276 #endif
277 
278 #ifdef CONFIG_TRACE_IRQFLAGS
279         seq_printf(m, " in-hardirq chains:             %11u\n",
280                         nr_hardirq_chains);
281         seq_printf(m, " in-softirq chains:             %11u\n",
282                         nr_softirq_chains);
283 #endif
284         seq_printf(m, " in-process chains:             %11u\n",
285                         nr_process_chains);
286         seq_printf(m, " stack-trace entries:           %11lu [max: %lu]\n",
287                         nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES);
288         seq_printf(m, " combined max dependencies:     %11u\n",
289                         (nr_hardirq_chains + 1) *
290                         (nr_softirq_chains + 1) *
291                         (nr_process_chains + 1)
292         );
293         seq_printf(m, " hardirq-safe locks:            %11lu\n",
294                         nr_hardirq_safe);
295         seq_printf(m, " hardirq-unsafe locks:          %11lu\n",
296                         nr_hardirq_unsafe);
297         seq_printf(m, " softirq-safe locks:            %11lu\n",
298                         nr_softirq_safe);
299         seq_printf(m, " softirq-unsafe locks:          %11lu\n",
300                         nr_softirq_unsafe);
301         seq_printf(m, " irq-safe locks:                %11lu\n",
302                         nr_irq_safe);
303         seq_printf(m, " irq-unsafe locks:              %11lu\n",
304                         nr_irq_unsafe);
305 
306         seq_printf(m, " hardirq-read-safe locks:       %11lu\n",
307                         nr_hardirq_read_safe);
308         seq_printf(m, " hardirq-read-unsafe locks:     %11lu\n",
309                         nr_hardirq_read_unsafe);
310         seq_printf(m, " softirq-read-safe locks:       %11lu\n",
311                         nr_softirq_read_safe);
312         seq_printf(m, " softirq-read-unsafe locks:     %11lu\n",
313                         nr_softirq_read_unsafe);
314         seq_printf(m, " irq-read-safe locks:           %11lu\n",
315                         nr_irq_read_safe);
316         seq_printf(m, " irq-read-unsafe locks:         %11lu\n",
317                         nr_irq_read_unsafe);
318 
319         seq_printf(m, " uncategorized locks:           %11lu\n",
320                         nr_uncategorized);
321         seq_printf(m, " unused locks:                  %11lu\n",
322                         nr_unused);
323         seq_printf(m, " max locking depth:             %11u\n",
324                         max_lockdep_depth);
325 #ifdef CONFIG_PROVE_LOCKING
326         seq_printf(m, " max bfs queue depth:           %11u\n",
327                         max_bfs_queue_depth);
328 #endif
329         lockdep_stats_debug_show(m);
330         seq_printf(m, " debug_locks:                   %11u\n",
331                         debug_locks);
332 
333         return 0;
334 }
335 
336 #ifdef CONFIG_LOCK_STAT
337 
338 struct lock_stat_data {
339         struct lock_class *class;
340         struct lock_class_stats stats;
341 };
342 
343 struct lock_stat_seq {
344         struct lock_stat_data *iter_end;
345         struct lock_stat_data stats[MAX_LOCKDEP_KEYS];
346 };
347 
348 /*
349  * sort on absolute number of contentions
350  */
351 static int lock_stat_cmp(const void *l, const void *r)
352 {
353         const struct lock_stat_data *dl = l, *dr = r;
354         unsigned long nl, nr;
355 
356         nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr;
357         nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr;
358 
359         return nr - nl;
360 }
361 
362 static void seq_line(struct seq_file *m, char c, int offset, int length)
363 {
364         int i;
365 
366         for (i = 0; i < offset; i++)
367                 seq_puts(m, " ");
368         for (i = 0; i < length; i++)
369                 seq_printf(m, "%c", c);
370         seq_puts(m, "\n");
371 }
372 
373 static void snprint_time(char *buf, size_t bufsiz, s64 nr)
374 {
375         s64 div;
376         s32 rem;
377 
378         nr += 5; /* for display rounding */
379         div = div_s64_rem(nr, 1000, &rem);
380         snprintf(buf, bufsiz, "%lld.%02d", (long long)div, (int)rem/10);
381 }
382 
383 static void seq_time(struct seq_file *m, s64 time)
384 {
385         char num[15];
386 
387         snprint_time(num, sizeof(num), time);
388         seq_printf(m, " %14s", num);
389 }
390 
391 static void seq_lock_time(struct seq_file *m, struct lock_time *lt)
392 {
393         seq_printf(m, "%14lu", lt->nr);
394         seq_time(m, lt->min);
395         seq_time(m, lt->max);
396         seq_time(m, lt->total);
397         seq_time(m, lt->nr ? div_s64(lt->total, lt->nr) : 0);
398 }
399 
400 static void seq_stats(struct seq_file *m, struct lock_stat_data *data)
401 {
402         struct lockdep_subclass_key *ckey;
403         struct lock_class_stats *stats;
404         struct lock_class *class;
405         const char *cname;
406         int i, namelen;
407         char name[39];
408 
409         class = data->class;
410         stats = &data->stats;
411 
412         namelen = 38;
413         if (class->name_version > 1)
414                 namelen -= 2; /* XXX truncates versions > 9 */
415         if (class->subclass)
416                 namelen -= 2;
417 
418         rcu_read_lock_sched();
419         cname = rcu_dereference_sched(class->name);
420         ckey  = rcu_dereference_sched(class->key);
421 
422         if (!cname && !ckey) {
423                 rcu_read_unlock_sched();
424                 return;
425 
426         } else if (!cname) {
427                 char str[KSYM_NAME_LEN];
428                 const char *key_name;
429 
430                 key_name = __get_key_name(ckey, str);
431                 snprintf(name, namelen, "%s", key_name);
432         } else {
433                 snprintf(name, namelen, "%s", cname);
434         }
435         rcu_read_unlock_sched();
436 
437         namelen = strlen(name);
438         if (class->name_version > 1) {
439                 snprintf(name+namelen, 3, "#%d", class->name_version);
440                 namelen += 2;
441         }
442         if (class->subclass) {
443                 snprintf(name+namelen, 3, "/%d", class->subclass);
444                 namelen += 2;
445         }
446 
447         if (stats->write_holdtime.nr) {
448                 if (stats->read_holdtime.nr)
449                         seq_printf(m, "%38s-W:", name);
450                 else
451                         seq_printf(m, "%40s:", name);
452 
453                 seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]);
454                 seq_lock_time(m, &stats->write_waittime);
455                 seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]);
456                 seq_lock_time(m, &stats->write_holdtime);
457                 seq_puts(m, "\n");
458         }
459 
460         if (stats->read_holdtime.nr) {
461                 seq_printf(m, "%38s-R:", name);
462                 seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]);
463                 seq_lock_time(m, &stats->read_waittime);
464                 seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]);
465                 seq_lock_time(m, &stats->read_holdtime);
466                 seq_puts(m, "\n");
467         }
468 
469         if (stats->read_waittime.nr + stats->write_waittime.nr == 0)
470                 return;
471 
472         if (stats->read_holdtime.nr)
473                 namelen += 2;
474 
475         for (i = 0; i < LOCKSTAT_POINTS; i++) {
476                 char ip[32];
477 
478                 if (class->contention_point[i] == 0)
479                         break;
480 
481                 if (!i)
482                         seq_line(m, '-', 40-namelen, namelen);
483 
484                 snprintf(ip, sizeof(ip), "[<%p>]",
485                                 (void *)class->contention_point[i]);
486                 seq_printf(m, "%40s %14lu %29s %pS\n",
487                            name, stats->contention_point[i],
488                            ip, (void *)class->contention_point[i]);
489         }
490         for (i = 0; i < LOCKSTAT_POINTS; i++) {
491                 char ip[32];
492 
493                 if (class->contending_point[i] == 0)
494                         break;
495 
496                 if (!i)
497                         seq_line(m, '-', 40-namelen, namelen);
498 
499                 snprintf(ip, sizeof(ip), "[<%p>]",
500                                 (void *)class->contending_point[i]);
501                 seq_printf(m, "%40s %14lu %29s %pS\n",
502                            name, stats->contending_point[i],
503                            ip, (void *)class->contending_point[i]);
504         }
505         if (i) {
506                 seq_puts(m, "\n");
507                 seq_line(m, '.', 0, 40 + 1 + 12 * (14 + 1));
508                 seq_puts(m, "\n");
509         }
510 }
511 
512 static void seq_header(struct seq_file *m)
513 {
514         seq_puts(m, "lock_stat version 0.4\n");
515 
516         if (unlikely(!debug_locks))
517                 seq_printf(m, "*WARNING* lock debugging disabled!! - possibly due to a lockdep warning\n");
518 
519         seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1));
520         seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s %14s %14s "
521                         "%14s %14s\n",
522                         "class name",
523                         "con-bounces",
524                         "contentions",
525                         "waittime-min",
526                         "waittime-max",
527                         "waittime-total",
528                         "waittime-avg",
529                         "acq-bounces",
530                         "acquisitions",
531                         "holdtime-min",
532                         "holdtime-max",
533                         "holdtime-total",
534                         "holdtime-avg");
535         seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1));
536         seq_printf(m, "\n");
537 }
538 
539 static void *ls_start(struct seq_file *m, loff_t *pos)
540 {
541         struct lock_stat_seq *data = m->private;
542         struct lock_stat_data *iter;
543 
544         if (*pos == 0)
545                 return SEQ_START_TOKEN;
546 
547         iter = data->stats + (*pos - 1);
548         if (iter >= data->iter_end)
549                 iter = NULL;
550 
551         return iter;
552 }
553 
554 static void *ls_next(struct seq_file *m, void *v, loff_t *pos)
555 {
556         (*pos)++;
557         return ls_start(m, pos);
558 }
559 
560 static void ls_stop(struct seq_file *m, void *v)
561 {
562 }
563 
564 static int ls_show(struct seq_file *m, void *v)
565 {
566         if (v == SEQ_START_TOKEN)
567                 seq_header(m);
568         else
569                 seq_stats(m, v);
570 
571         return 0;
572 }
573 
574 static const struct seq_operations lockstat_ops = {
575         .start  = ls_start,
576         .next   = ls_next,
577         .stop   = ls_stop,
578         .show   = ls_show,
579 };
580 
581 static int lock_stat_open(struct inode *inode, struct file *file)
582 {
583         int res;
584         struct lock_class *class;
585         struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq));
586 
587         if (!data)
588                 return -ENOMEM;
589 
590         res = seq_open(file, &lockstat_ops);
591         if (!res) {
592                 struct lock_stat_data *iter = data->stats;
593                 struct seq_file *m = file->private_data;
594 
595                 list_for_each_entry(class, &all_lock_classes, lock_entry) {
596                         iter->class = class;
597                         iter->stats = lock_stats(class);
598                         iter++;
599                 }
600                 data->iter_end = iter;
601 
602                 sort(data->stats, data->iter_end - data->stats,
603                                 sizeof(struct lock_stat_data),
604                                 lock_stat_cmp, NULL);
605 
606                 m->private = data;
607         } else
608                 vfree(data);
609 
610         return res;
611 }
612 
613 static ssize_t lock_stat_write(struct file *file, const char __user *buf,
614                                size_t count, loff_t *ppos)
615 {
616         struct lock_class *class;
617         char c;
618 
619         if (count) {
620                 if (get_user(c, buf))
621                         return -EFAULT;
622 
623                 if (c != '')
624                         return count;
625 
626                 list_for_each_entry(class, &all_lock_classes, lock_entry)
627                         clear_lock_stats(class);
628         }
629         return count;
630 }
631 
632 static int lock_stat_release(struct inode *inode, struct file *file)
633 {
634         struct seq_file *seq = file->private_data;
635 
636         vfree(seq->private);
637         return seq_release(inode, file);
638 }
639 
640 static const struct file_operations proc_lock_stat_operations = {
641         .open           = lock_stat_open,
642         .write          = lock_stat_write,
643         .read           = seq_read,
644         .llseek         = seq_lseek,
645         .release        = lock_stat_release,
646 };
647 #endif /* CONFIG_LOCK_STAT */
648 
649 static int __init lockdep_proc_init(void)
650 {
651         proc_create_seq("lockdep", S_IRUSR, NULL, &lockdep_ops);
652 #ifdef CONFIG_PROVE_LOCKING
653         proc_create_seq("lockdep_chains", S_IRUSR, NULL, &lockdep_chains_ops);
654 #endif
655         proc_create_single("lockdep_stats", S_IRUSR, NULL, lockdep_stats_show);
656 #ifdef CONFIG_LOCK_STAT
657         proc_create("lock_stat", S_IRUSR | S_IWUSR, NULL,
658                     &proc_lock_stat_operations);
659 #endif
660 
661         return 0;
662 }
663 
664 __initcall(lockdep_proc_init);
665 
666 

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