linux/kernel/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/module.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
  26static 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
  31static void *l_start(struct seq_file *m, loff_t *pos)
  32{
  33        return seq_list_start_head(&all_lock_classes, *pos);
  34}
  35
  36static void l_stop(struct seq_file *m, void *v)
  37{
  38}
  39
  40static void print_name(struct seq_file *m, struct lock_class *class)
  41{
  42        char str[128];
  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
  57static 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
  96static const struct seq_operations lockdep_ops = {
  97        .start  = l_start,
  98        .next   = l_next,
  99        .stop   = l_stop,
 100        .show   = l_show,
 101};
 102
 103static int lockdep_open(struct inode *inode, struct file *file)
 104{
 105        return seq_open(file, &lockdep_ops);
 106}
 107
 108static 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
 116static 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
 127static void *lc_next(struct seq_file *m, void *v, loff_t *pos)
 128{
 129        (*pos)++;
 130        return lc_start(m, pos);
 131}
 132
 133static void lc_stop(struct seq_file *m, void *v)
 134{
 135}
 136
 137static 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
 164static 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
 171static int lockdep_chains_open(struct inode *inode, struct file *file)
 172{
 173        return seq_open(file, &lockdep_chains_ops);
 174}
 175
 176static 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
 184static 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
 218static 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, factor = 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        /*
 287         * Estimated factor between direct and indirect
 288         * dependencies:
 289         */
 290        if (nr_list_entries)
 291                factor = sum_forward_deps / nr_list_entries;
 292
 293#ifdef CONFIG_PROVE_LOCKING
 294        seq_printf(m, " dependency chains:             %11lu [max: %lu]\n",
 295                        nr_lock_chains, MAX_LOCKDEP_CHAINS);
 296        seq_printf(m, " dependency chain hlocks:       %11d [max: %lu]\n",
 297                        nr_chain_hlocks, MAX_LOCKDEP_CHAIN_HLOCKS);
 298#endif
 299
 300#ifdef CONFIG_TRACE_IRQFLAGS
 301        seq_printf(m, " in-hardirq chains:             %11u\n",
 302                        nr_hardirq_chains);
 303        seq_printf(m, " in-softirq chains:             %11u\n",
 304                        nr_softirq_chains);
 305#endif
 306        seq_printf(m, " in-process chains:             %11u\n",
 307                        nr_process_chains);
 308        seq_printf(m, " stack-trace entries:           %11lu [max: %lu]\n",
 309                        nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES);
 310        seq_printf(m, " combined max dependencies:     %11u\n",
 311                        (nr_hardirq_chains + 1) *
 312                        (nr_softirq_chains + 1) *
 313                        (nr_process_chains + 1)
 314        );
 315        seq_printf(m, " hardirq-safe locks:            %11lu\n",
 316                        nr_hardirq_safe);
 317        seq_printf(m, " hardirq-unsafe locks:          %11lu\n",
 318                        nr_hardirq_unsafe);
 319        seq_printf(m, " softirq-safe locks:            %11lu\n",
 320                        nr_softirq_safe);
 321        seq_printf(m, " softirq-unsafe locks:          %11lu\n",
 322                        nr_softirq_unsafe);
 323        seq_printf(m, " irq-safe locks:                %11lu\n",
 324                        nr_irq_safe);
 325        seq_printf(m, " irq-unsafe locks:              %11lu\n",
 326                        nr_irq_unsafe);
 327
 328        seq_printf(m, " hardirq-read-safe locks:       %11lu\n",
 329                        nr_hardirq_read_safe);
 330        seq_printf(m, " hardirq-read-unsafe locks:     %11lu\n",
 331                        nr_hardirq_read_unsafe);
 332        seq_printf(m, " softirq-read-safe locks:       %11lu\n",
 333                        nr_softirq_read_safe);
 334        seq_printf(m, " softirq-read-unsafe locks:     %11lu\n",
 335                        nr_softirq_read_unsafe);
 336        seq_printf(m, " irq-read-safe locks:           %11lu\n",
 337                        nr_irq_read_safe);
 338        seq_printf(m, " irq-read-unsafe locks:         %11lu\n",
 339                        nr_irq_read_unsafe);
 340
 341        seq_printf(m, " uncategorized locks:           %11lu\n",
 342                        nr_uncategorized);
 343        seq_printf(m, " unused locks:                  %11lu\n",
 344                        nr_unused);
 345        seq_printf(m, " max locking depth:             %11u\n",
 346                        max_lockdep_depth);
 347#ifdef CONFIG_PROVE_LOCKING
 348        seq_printf(m, " max bfs queue depth:           %11u\n",
 349                        max_bfs_queue_depth);
 350#endif
 351        lockdep_stats_debug_show(m);
 352        seq_printf(m, " debug_locks:                   %11u\n",
 353                        debug_locks);
 354
 355        return 0;
 356}
 357
 358static int lockdep_stats_open(struct inode *inode, struct file *file)
 359{
 360        return single_open(file, lockdep_stats_show, NULL);
 361}
 362
 363static const struct file_operations proc_lockdep_stats_operations = {
 364        .open           = lockdep_stats_open,
 365        .read           = seq_read,
 366        .llseek         = seq_lseek,
 367        .release        = single_release,
 368};
 369
 370#ifdef CONFIG_LOCK_STAT
 371
 372struct lock_stat_data {
 373        struct lock_class *class;
 374        struct lock_class_stats stats;
 375};
 376
 377struct lock_stat_seq {
 378        struct lock_stat_data *iter_end;
 379        struct lock_stat_data stats[MAX_LOCKDEP_KEYS];
 380};
 381
 382/*
 383 * sort on absolute number of contentions
 384 */
 385static int lock_stat_cmp(const void *l, const void *r)
 386{
 387        const struct lock_stat_data *dl = l, *dr = r;
 388        unsigned long nl, nr;
 389
 390        nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr;
 391        nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr;
 392
 393        return nr - nl;
 394}
 395
 396static void seq_line(struct seq_file *m, char c, int offset, int length)
 397{
 398        int i;
 399
 400        for (i = 0; i < offset; i++)
 401                seq_puts(m, " ");
 402        for (i = 0; i < length; i++)
 403                seq_printf(m, "%c", c);
 404        seq_puts(m, "\n");
 405}
 406
 407static void snprint_time(char *buf, size_t bufsiz, s64 nr)
 408{
 409        s64 div;
 410        s32 rem;
 411
 412        nr += 5; /* for display rounding */
 413        div = div_s64_rem(nr, 1000, &rem);
 414        snprintf(buf, bufsiz, "%lld.%02d", (long long)div, (int)rem/10);
 415}
 416
 417static void seq_time(struct seq_file *m, s64 time)
 418{
 419        char num[15];
 420
 421        snprint_time(num, sizeof(num), time);
 422        seq_printf(m, " %14s", num);
 423}
 424
 425static void seq_lock_time(struct seq_file *m, struct lock_time *lt)
 426{
 427        seq_printf(m, "%14lu", lt->nr);
 428        seq_time(m, lt->min);
 429        seq_time(m, lt->max);
 430        seq_time(m, lt->total);
 431}
 432
 433static void seq_stats(struct seq_file *m, struct lock_stat_data *data)
 434{
 435        char name[39];
 436        struct lock_class *class;
 437        struct lock_class_stats *stats;
 438        int i, namelen;
 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        if (!class->name) {
 450                char str[KSYM_NAME_LEN];
 451                const char *key_name;
 452
 453                key_name = __get_key_name(class->key, str);
 454                snprintf(name, namelen, "%s", key_name);
 455        } else {
 456                snprintf(name, namelen, "%s", class->name);
 457        }
 458        namelen = strlen(name);
 459        if (class->name_version > 1) {
 460                snprintf(name+namelen, 3, "#%d", class->name_version);
 461                namelen += 2;
 462        }
 463        if (class->subclass) {
 464                snprintf(name+namelen, 3, "/%d", class->subclass);
 465                namelen += 2;
 466        }
 467
 468        if (stats->write_holdtime.nr) {
 469                if (stats->read_holdtime.nr)
 470                        seq_printf(m, "%38s-W:", name);
 471                else
 472                        seq_printf(m, "%40s:", name);
 473
 474                seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]);
 475                seq_lock_time(m, &stats->write_waittime);
 476                seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]);
 477                seq_lock_time(m, &stats->write_holdtime);
 478                seq_puts(m, "\n");
 479        }
 480
 481        if (stats->read_holdtime.nr) {
 482                seq_printf(m, "%38s-R:", name);
 483                seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]);
 484                seq_lock_time(m, &stats->read_waittime);
 485                seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]);
 486                seq_lock_time(m, &stats->read_holdtime);
 487                seq_puts(m, "\n");
 488        }
 489
 490        if (stats->read_waittime.nr + stats->write_waittime.nr == 0)
 491                return;
 492
 493        if (stats->read_holdtime.nr)
 494                namelen += 2;
 495
 496        for (i = 0; i < LOCKSTAT_POINTS; i++) {
 497                char sym[KSYM_SYMBOL_LEN];
 498                char ip[32];
 499
 500                if (class->contention_point[i] == 0)
 501                        break;
 502
 503                if (!i)
 504                        seq_line(m, '-', 40-namelen, namelen);
 505
 506                sprint_symbol(sym, class->contention_point[i]);
 507                snprintf(ip, sizeof(ip), "[<%p>]",
 508                                (void *)class->contention_point[i]);
 509                seq_printf(m, "%40s %14lu %29s %s\n", name,
 510                                stats->contention_point[i],
 511                                ip, sym);
 512        }
 513        for (i = 0; i < LOCKSTAT_POINTS; i++) {
 514                char sym[KSYM_SYMBOL_LEN];
 515                char ip[32];
 516
 517                if (class->contending_point[i] == 0)
 518                        break;
 519
 520                if (!i)
 521                        seq_line(m, '-', 40-namelen, namelen);
 522
 523                sprint_symbol(sym, class->contending_point[i]);
 524                snprintf(ip, sizeof(ip), "[<%p>]",
 525                                (void *)class->contending_point[i]);
 526                seq_printf(m, "%40s %14lu %29s %s\n", name,
 527                                stats->contending_point[i],
 528                                ip, sym);
 529        }
 530        if (i) {
 531                seq_puts(m, "\n");
 532                seq_line(m, '.', 0, 40 + 1 + 10 * (14 + 1));
 533                seq_puts(m, "\n");
 534        }
 535}
 536
 537static void seq_header(struct seq_file *m)
 538{
 539        seq_printf(m, "lock_stat version 0.3\n");
 540
 541        if (unlikely(!debug_locks))
 542                seq_printf(m, "*WARNING* lock debugging disabled!! - possibly due to a lockdep warning\n");
 543
 544        seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1));
 545        seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s "
 546                        "%14s %14s\n",
 547                        "class name",
 548                        "con-bounces",
 549                        "contentions",
 550                        "waittime-min",
 551                        "waittime-max",
 552                        "waittime-total",
 553                        "acq-bounces",
 554                        "acquisitions",
 555                        "holdtime-min",
 556                        "holdtime-max",
 557                        "holdtime-total");
 558        seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1));
 559        seq_printf(m, "\n");
 560}
 561
 562static void *ls_start(struct seq_file *m, loff_t *pos)
 563{
 564        struct lock_stat_seq *data = m->private;
 565        struct lock_stat_data *iter;
 566
 567        if (*pos == 0)
 568                return SEQ_START_TOKEN;
 569
 570        iter = data->stats + (*pos - 1);
 571        if (iter >= data->iter_end)
 572                iter = NULL;
 573
 574        return iter;
 575}
 576
 577static void *ls_next(struct seq_file *m, void *v, loff_t *pos)
 578{
 579        (*pos)++;
 580        return ls_start(m, pos);
 581}
 582
 583static void ls_stop(struct seq_file *m, void *v)
 584{
 585}
 586
 587static int ls_show(struct seq_file *m, void *v)
 588{
 589        if (v == SEQ_START_TOKEN)
 590                seq_header(m);
 591        else
 592                seq_stats(m, v);
 593
 594        return 0;
 595}
 596
 597static const struct seq_operations lockstat_ops = {
 598        .start  = ls_start,
 599        .next   = ls_next,
 600        .stop   = ls_stop,
 601        .show   = ls_show,
 602};
 603
 604static int lock_stat_open(struct inode *inode, struct file *file)
 605{
 606        int res;
 607        struct lock_class *class;
 608        struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq));
 609
 610        if (!data)
 611                return -ENOMEM;
 612
 613        res = seq_open(file, &lockstat_ops);
 614        if (!res) {
 615                struct lock_stat_data *iter = data->stats;
 616                struct seq_file *m = file->private_data;
 617
 618                list_for_each_entry(class, &all_lock_classes, lock_entry) {
 619                        iter->class = class;
 620                        iter->stats = lock_stats(class);
 621                        iter++;
 622                }
 623                data->iter_end = iter;
 624
 625                sort(data->stats, data->iter_end - data->stats,
 626                                sizeof(struct lock_stat_data),
 627                                lock_stat_cmp, NULL);
 628
 629                m->private = data;
 630        } else
 631                vfree(data);
 632
 633        return res;
 634}
 635
 636static ssize_t lock_stat_write(struct file *file, const char __user *buf,
 637                               size_t count, loff_t *ppos)
 638{
 639        struct lock_class *class;
 640        char c;
 641
 642        if (count) {
 643                if (get_user(c, buf))
 644                        return -EFAULT;
 645
 646                if (c != '0')
 647                        return count;
 648
 649                list_for_each_entry(class, &all_lock_classes, lock_entry)
 650                        clear_lock_stats(class);
 651        }
 652        return count;
 653}
 654
 655static int lock_stat_release(struct inode *inode, struct file *file)
 656{
 657        struct seq_file *seq = file->private_data;
 658
 659        vfree(seq->private);
 660        return seq_release(inode, file);
 661}
 662
 663static const struct file_operations proc_lock_stat_operations = {
 664        .open           = lock_stat_open,
 665        .write          = lock_stat_write,
 666        .read           = seq_read,
 667        .llseek         = seq_lseek,
 668        .release        = lock_stat_release,
 669};
 670#endif /* CONFIG_LOCK_STAT */
 671
 672static int __init lockdep_proc_init(void)
 673{
 674        proc_create("lockdep", S_IRUSR, NULL, &proc_lockdep_operations);
 675#ifdef CONFIG_PROVE_LOCKING
 676        proc_create("lockdep_chains", S_IRUSR, NULL,
 677                    &proc_lockdep_chains_operations);
 678#endif
 679        proc_create("lockdep_stats", S_IRUSR, NULL,
 680                    &proc_lockdep_stats_operations);
 681
 682#ifdef CONFIG_LOCK_STAT
 683        proc_create("lock_stat", S_IRUSR | S_IWUSR, NULL,
 684                    &proc_lock_stat_operations);
 685#endif
 686
 687        return 0;
 688}
 689
 690__initcall(lockdep_proc_init);
 691
 692