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

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