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

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

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