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 static const char * const irq_strs[] = { 132 [0] = "0", 133 [LOCK_CHAIN_HARDIRQ_CONTEXT] = "hardirq", 134 [LOCK_CHAIN_SOFTIRQ_CONTEXT] = "softirq", 135 [LOCK_CHAIN_SOFTIRQ_CONTEXT| 136 LOCK_CHAIN_HARDIRQ_CONTEXT] = "hardirq|softirq", 137 }; 138 139 if (v == SEQ_START_TOKEN) { 140 if (!nr_free_chain_hlocks) 141 seq_printf(m, "(buggered) "); 142 seq_printf(m, "all lock chains:\n"); 143 return 0; 144 } 145 146 seq_printf(m, "irq_context: %s\n", irq_strs[chain->irq_context]); 147 148 for (i = 0; i < chain->depth; i++) { 149 class = lock_chain_get_class(chain, i); 150 if (!class->key) 151 continue; 152 153 seq_printf(m, "[%p] ", class->key); 154 print_name(m, class); 155 seq_puts(m, "\n"); 156 } 157 seq_puts(m, "\n"); 158 159 return 0; 160 } 161 162 static const struct seq_operations lockdep_chains_ops = { 163 .start = lc_start, 164 .next = lc_next, 165 .stop = lc_stop, 166 .show = lc_show, 167 }; 168 #endif /* CONFIG_PROVE_LOCKING */ 169 170 static void lockdep_stats_debug_show(struct seq_file *m) 171 { 172 #ifdef CONFIG_DEBUG_LOCKDEP 173 unsigned long long hi1 = debug_atomic_read(hardirqs_on_events), 174 hi2 = debug_atomic_read(hardirqs_off_events), 175 hr1 = debug_atomic_read(redundant_hardirqs_on), 176 hr2 = debug_atomic_read(redundant_hardirqs_off), 177 si1 = debug_atomic_read(softirqs_on_events), 178 si2 = debug_atomic_read(softirqs_off_events), 179 sr1 = debug_atomic_read(redundant_softirqs_on), 180 sr2 = debug_atomic_read(redundant_softirqs_off); 181 182 seq_printf(m, " chain lookup misses: %11llu\n", 183 debug_atomic_read(chain_lookup_misses)); 184 seq_printf(m, " chain lookup hits: %11llu\n", 185 debug_atomic_read(chain_lookup_hits)); 186 seq_printf(m, " cyclic checks: %11llu\n", 187 debug_atomic_read(nr_cyclic_checks)); 188 seq_printf(m, " redundant checks: %11llu\n", 189 debug_atomic_read(nr_redundant_checks)); 190 seq_printf(m, " redundant links: %11llu\n", 191 debug_atomic_read(nr_redundant)); 192 seq_printf(m, " find-mask forwards checks: %11llu\n", 193 debug_atomic_read(nr_find_usage_forwards_checks)); 194 seq_printf(m, " find-mask backwards checks: %11llu\n", 195 debug_atomic_read(nr_find_usage_backwards_checks)); 196 197 seq_printf(m, " hardirq on events: %11llu\n", hi1); 198 seq_printf(m, " hardirq off events: %11llu\n", hi2); 199 seq_printf(m, " redundant hardirq ons: %11llu\n", hr1); 200 seq_printf(m, " redundant hardirq offs: %11llu\n", hr2); 201 seq_printf(m, " softirq on events: %11llu\n", si1); 202 seq_printf(m, " softirq off events: %11llu\n", si2); 203 seq_printf(m, " redundant softirq ons: %11llu\n", sr1); 204 seq_printf(m, " redundant softirq offs: %11llu\n", sr2); 205 #endif 206 } 207 208 static int lockdep_stats_show(struct seq_file *m, void *v) 209 { 210 unsigned long nr_unused = 0, nr_uncategorized = 0, 211 nr_irq_safe = 0, nr_irq_unsafe = 0, 212 nr_softirq_safe = 0, nr_softirq_unsafe = 0, 213 nr_hardirq_safe = 0, nr_hardirq_unsafe = 0, 214 nr_irq_read_safe = 0, nr_irq_read_unsafe = 0, 215 nr_softirq_read_safe = 0, nr_softirq_read_unsafe = 0, 216 nr_hardirq_read_safe = 0, nr_hardirq_read_unsafe = 0, 217 sum_forward_deps = 0; 218 219 #ifdef CONFIG_PROVE_LOCKING 220 struct lock_class *class; 221 222 list_for_each_entry(class, &all_lock_classes, lock_entry) { 223 224 if (class->usage_mask == 0) 225 nr_unused++; 226 if (class->usage_mask == LOCKF_USED) 227 nr_uncategorized++; 228 if (class->usage_mask & LOCKF_USED_IN_IRQ) 229 nr_irq_safe++; 230 if (class->usage_mask & LOCKF_ENABLED_IRQ) 231 nr_irq_unsafe++; 232 if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ) 233 nr_softirq_safe++; 234 if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ) 235 nr_softirq_unsafe++; 236 if (class->usage_mask & LOCKF_USED_IN_HARDIRQ) 237 nr_hardirq_safe++; 238 if (class->usage_mask & LOCKF_ENABLED_HARDIRQ) 239 nr_hardirq_unsafe++; 240 if (class->usage_mask & LOCKF_USED_IN_IRQ_READ) 241 nr_irq_read_safe++; 242 if (class->usage_mask & LOCKF_ENABLED_IRQ_READ) 243 nr_irq_read_unsafe++; 244 if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ) 245 nr_softirq_read_safe++; 246 if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ_READ) 247 nr_softirq_read_unsafe++; 248 if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ) 249 nr_hardirq_read_safe++; 250 if (class->usage_mask & LOCKF_ENABLED_HARDIRQ_READ) 251 nr_hardirq_read_unsafe++; 252 253 sum_forward_deps += lockdep_count_forward_deps(class); 254 } 255 #ifdef CONFIG_DEBUG_LOCKDEP 256 DEBUG_LOCKS_WARN_ON(debug_atomic_read(nr_unused_locks) != nr_unused); 257 #endif 258 259 #endif 260 seq_printf(m, " lock-classes: %11lu [max: %lu]\n", 261 nr_lock_classes, MAX_LOCKDEP_KEYS); 262 seq_printf(m, " direct dependencies: %11lu [max: %lu]\n", 263 nr_list_entries, MAX_LOCKDEP_ENTRIES); 264 seq_printf(m, " indirect dependencies: %11lu\n", 265 sum_forward_deps); 266 267 /* 268 * Total number of dependencies: 269 * 270 * All irq-safe locks may nest inside irq-unsafe locks, 271 * plus all the other known dependencies: 272 */ 273 seq_printf(m, " all direct dependencies: %11lu\n", 274 nr_irq_unsafe * nr_irq_safe + 275 nr_hardirq_unsafe * nr_hardirq_safe + 276 nr_list_entries); 277 278 #ifdef CONFIG_PROVE_LOCKING 279 seq_printf(m, " dependency chains: %11lu [max: %lu]\n", 280 lock_chain_count(), MAX_LOCKDEP_CHAINS); 281 seq_printf(m, " dependency chain hlocks used: %11lu [max: %lu]\n", 282 MAX_LOCKDEP_CHAIN_HLOCKS - 283 (nr_free_chain_hlocks + nr_lost_chain_hlocks), 284 MAX_LOCKDEP_CHAIN_HLOCKS); 285 seq_printf(m, " dependency chain hlocks lost: %11u\n", 286 nr_lost_chain_hlocks); 287 #endif 288 289 #ifdef CONFIG_TRACE_IRQFLAGS 290 seq_printf(m, " in-hardirq chains: %11u\n", 291 nr_hardirq_chains); 292 seq_printf(m, " in-softirq chains: %11u\n", 293 nr_softirq_chains); 294 #endif 295 seq_printf(m, " in-process chains: %11u\n", 296 nr_process_chains); 297 seq_printf(m, " stack-trace entries: %11lu [max: %lu]\n", 298 nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES); 299 #if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_PROVE_LOCKING) 300 seq_printf(m, " number of stack traces: %11llu\n", 301 lockdep_stack_trace_count()); 302 seq_printf(m, " number of stack hash chains: %11llu\n", 303 lockdep_stack_hash_count()); 304 #endif 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 /* 351 * Zappped classes and lockdep data buffers reuse statistics. 352 */ 353 seq_puts(m, "\n"); 354 seq_printf(m, " zapped classes: %11lu\n", 355 nr_zapped_classes); 356 #ifdef CONFIG_PROVE_LOCKING 357 seq_printf(m, " zapped lock chains: %11lu\n", 358 nr_zapped_lock_chains); 359 seq_printf(m, " large chain blocks: %11u\n", 360 nr_large_chain_blocks); 361 #endif 362 return 0; 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 const 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 != '0') 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 proc_ops lock_stat_proc_ops = { 670 .proc_open = lock_stat_open, 671 .proc_write = lock_stat_write, 672 .proc_read = seq_read, 673 .proc_lseek = seq_lseek, 674 .proc_release = lock_stat_release, 675 }; 676 #endif /* CONFIG_LOCK_STAT */ 677 678 static int __init lockdep_proc_init(void) 679 { 680 proc_create_seq("lockdep", S_IRUSR, NULL, &lockdep_ops); 681 #ifdef CONFIG_PROVE_LOCKING 682 proc_create_seq("lockdep_chains", S_IRUSR, NULL, &lockdep_chains_ops); 683 #endif 684 proc_create_single("lockdep_stats", S_IRUSR, NULL, lockdep_stats_show); 685 #ifdef CONFIG_LOCK_STAT 686 proc_create("lock_stat", S_IRUSR | S_IWUSR, NULL, &lock_stat_proc_ops); 687 #endif 688 689 return 0; 690 } 691 692 __initcall(lockdep_proc_init); 693 694