lib/locking-selftest.c

   1 /*
   2  * lib/locking-selftest.c
   3  *
   4  * Testsuite for various locking APIs: spinlocks, rwlocks,
   5  * mutexes and rw-semaphores.
   6  *
   7  * It is checking both false positives and false negatives.
   8  *
   9  * Started by Ingo Molnar:
  10  *
  11  *  Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
  12  */
  13 #include <linux/rwsem.h>
  14 #include <linux/mutex.h>
  15 #include <linux/sched.h>
  16 #include <linux/delay.h>
  17 #include <linux/lockdep.h>
  18 #include <linux/spinlock.h>
  19 #include <linux/kallsyms.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/debug_locks.h>
  22 #include <linux/irqflags.h>
  23
  24 /*
  25  * Change this to 1 if you want to see the failure printouts:
  26  */
  27 static unsigned int debug_locks_verbose;
  28
  29 static int __init setup_debug_locks_verbose(char *str)
  30 {
  31         get_option(&str, &debug_locks_verbose);
  32
  33         return 1;
  34 }
  35
  36 __setup("debug_locks_verbose=", setup_debug_locks_verbose);
  37
  38 #define FAILURE         0
  39 #define SUCCESS         1
  40
  41 #define LOCKTYPE_SPIN   0x1
  42 #define LOCKTYPE_RWLOCK 0x2
  43 #define LOCKTYPE_MUTEX  0x4
  44 #define LOCKTYPE_RWSEM  0x8
  45
  46 /*
  47  * Normal standalone locks, for the circular and irq-context
  48  * dependency tests:
  49  */
  50 static DEFINE_SPINLOCK(lock_A);
  51 static DEFINE_SPINLOCK(lock_B);
  52 static DEFINE_SPINLOCK(lock_C);
  53 static DEFINE_SPINLOCK(lock_D);
  54
  55 static DEFINE_RWLOCK(rwlock_A);
  56 static DEFINE_RWLOCK(rwlock_B);
  57 static DEFINE_RWLOCK(rwlock_C);
  58 static DEFINE_RWLOCK(rwlock_D);
  59
  60 static DEFINE_MUTEX(mutex_A);
  61 static DEFINE_MUTEX(mutex_B);
  62 static DEFINE_MUTEX(mutex_C);
  63 static DEFINE_MUTEX(mutex_D);
  64
  65 static DECLARE_RWSEM(rwsem_A);
  66 static DECLARE_RWSEM(rwsem_B);
  67 static DECLARE_RWSEM(rwsem_C);
  68 static DECLARE_RWSEM(rwsem_D);
  69
  70 /*
  71  * Locks that we initialize dynamically as well so that
  72  * e.g. X1 and X2 becomes two instances of the same class,
  73  * but X* and Y* are different classes. We do this so that
  74  * we do not trigger a real lockup:
  75  */
  76 static DEFINE_SPINLOCK(lock_X1);
  77 static DEFINE_SPINLOCK(lock_X2);
  78 static DEFINE_SPINLOCK(lock_Y1);
  79 static DEFINE_SPINLOCK(lock_Y2);
  80 static DEFINE_SPINLOCK(lock_Z1);
  81 static DEFINE_SPINLOCK(lock_Z2);
  82
  83 static DEFINE_RWLOCK(rwlock_X1);
  84 static DEFINE_RWLOCK(rwlock_X2);
  85 static DEFINE_RWLOCK(rwlock_Y1);
  86 static DEFINE_RWLOCK(rwlock_Y2);
  87 static DEFINE_RWLOCK(rwlock_Z1);
  88 static DEFINE_RWLOCK(rwlock_Z2);
  89
  90 static DEFINE_MUTEX(mutex_X1);
  91 static DEFINE_MUTEX(mutex_X2);
  92 static DEFINE_MUTEX(mutex_Y1);
  93 static DEFINE_MUTEX(mutex_Y2);
  94 static DEFINE_MUTEX(mutex_Z1);
  95 static DEFINE_MUTEX(mutex_Z2);
  96
  97 static DECLARE_RWSEM(rwsem_X1);
  98 static DECLARE_RWSEM(rwsem_X2);
  99 static DECLARE_RWSEM(rwsem_Y1);
 100 static DECLARE_RWSEM(rwsem_Y2);
 101 static DECLARE_RWSEM(rwsem_Z1);
 102 static DECLARE_RWSEM(rwsem_Z2);
 103
 104 /*
 105  * non-inlined runtime initializers, to let separate locks share
 106  * the same lock-class:
 107  */
 108 #define INIT_CLASS_FUNC(class)                          \
 109 static noinline void                                    \
 110 init_class_##class(spinlock_t *lock, rwlock_t *rwlock, struct mutex *mutex, \
 111                  struct rw_semaphore *rwsem)            \
 112 {                                                       \
 113         spin_lock_init(lock);                           \
 114         rwlock_init(rwlock);                            \
 115         mutex_init(mutex);                              \
 116         init_rwsem(rwsem);                              \
 117 }
 118
 119 INIT_CLASS_FUNC(X)
 120 INIT_CLASS_FUNC(Y)
 121 INIT_CLASS_FUNC(Z)
 122
 123 static void init_shared_classes(void)
 124 {
 125         init_class_X(&lock_X1, &rwlock_X1, &mutex_X1, &rwsem_X1);
 126         init_class_X(&lock_X2, &rwlock_X2, &mutex_X2, &rwsem_X2);
 127
 128         init_class_Y(&lock_Y1, &rwlock_Y1, &mutex_Y1, &rwsem_Y1);
 129         init_class_Y(&lock_Y2, &rwlock_Y2, &mutex_Y2, &rwsem_Y2);
 130
 131         init_class_Z(&lock_Z1, &rwlock_Z1, &mutex_Z1, &rwsem_Z1);
 132         init_class_Z(&lock_Z2, &rwlock_Z2, &mutex_Z2, &rwsem_Z2);
 133 }
 134
 135 /*
 136  * For spinlocks and rwlocks we also do hardirq-safe / softirq-safe tests.
 137  * The following functions use a lock from a simulated hardirq/softirq
 138  * context, causing the locks to be marked as hardirq-safe/softirq-safe:
 139  */
 140
 141 #define HARDIRQ_DISABLE         local_irq_disable
 142 #define HARDIRQ_ENABLE          local_irq_enable
 143
 144 #define HARDIRQ_ENTER()                         \
 145         local_irq_disable();                    \
 146         __irq_enter();                          \
 147         WARN_ON(!in_irq());
 148
 149 #define HARDIRQ_EXIT()                          \
 150         __irq_exit();                           \
 151         local_irq_enable();
 152
 153 #define SOFTIRQ_DISABLE         local_bh_disable
 154 #define SOFTIRQ_ENABLE          local_bh_enable
 155
 156 #define SOFTIRQ_ENTER()                         \
 157                 local_bh_disable();             \
 158                 local_irq_disable();            \
 159                 lockdep_softirq_enter();        \
 160                 WARN_ON(!in_softirq());
 161
 162 #define SOFTIRQ_EXIT()                          \
 163                 lockdep_softirq_exit();         \
 164                 local_irq_enable();             \
 165                 local_bh_enable();
 166
 167 /*
 168  * Shortcuts for lock/unlock API variants, to keep
 169  * the testcases compact:
 170  */
 171 #define L(x)                    spin_lock(&lock_##x)
 172 #define U(x)                    spin_unlock(&lock_##x)
 173 #define LU(x)                   L(x); U(x)
 174 #define SI(x)                   spin_lock_init(&lock_##x)
 175
 176 #define WL(x)                   write_lock(&rwlock_##x)
 177 #define WU(x)                   write_unlock(&rwlock_##x)
 178 #define WLU(x)                  WL(x); WU(x)
 179
 180 #define RL(x)                   read_lock(&rwlock_##x)
 181 #define RU(x)                   read_unlock(&rwlock_##x)
 182 #define RLU(x)                  RL(x); RU(x)
 183 #define RWI(x)                  rwlock_init(&rwlock_##x)
 184
 185 #define ML(x)                   mutex_lock(&mutex_##x)
 186 #define MU(x)                   mutex_unlock(&mutex_##x)
 187 #define MI(x)                   mutex_init(&mutex_##x)
 188
 189 #define WSL(x)                  down_write(&rwsem_##x)
 190 #define WSU(x)                  up_write(&rwsem_##x)
 191
 192 #define RSL(x)                  down_read(&rwsem_##x)
 193 #define RSU(x)                  up_read(&rwsem_##x)
 194 #define RWSI(x)                 init_rwsem(&rwsem_##x)
 195
 196 #define LOCK_UNLOCK_2(x,y)      LOCK(x); LOCK(y); UNLOCK(y); UNLOCK(x)
 197
 198 /*
 199  * Generate different permutations of the same testcase, using
 200  * the same basic lock-dependency/state events:
 201  */
 202
 203 #define GENERATE_TESTCASE(name)                 \
 204                                                 \
 205 static void name(void) { E(); }
 206
 207 #define GENERATE_PERMUTATIONS_2_EVENTS(name)    \
 208                                                 \
 209 static void name##_12(void) { E1(); E2(); }     \
 210 static void name##_21(void) { E2(); E1(); }
 211
 212 #define GENERATE_PERMUTATIONS_3_EVENTS(name)            \
 213                                                         \
 214 static void name##_123(void) { E1(); E2(); E3(); }      \
 215 static void name##_132(void) { E1(); E3(); E2(); }      \
 216 static void name##_213(void) { E2(); E1(); E3(); }      \
 217 static void name##_231(void) { E2(); E3(); E1(); }      \
 218 static void name##_312(void) { E3(); E1(); E2(); }      \
 219 static void name##_321(void) { E3(); E2(); E1(); }
 220
 221 /*
 222  * AA deadlock:
 223  */
 224
 225 #define E()                                     \
 226                                                 \
 227         LOCK(X1);                               \
 228         LOCK(X2); /* this one should fail */
 229
 230 /*
 231  * 6 testcases:
 232  */
 233 #include "locking-selftest-spin.h"
 234 GENERATE_TESTCASE(AA_spin)
 235 #include "locking-selftest-wlock.h"
 236 GENERATE_TESTCASE(AA_wlock)
 237 #include "locking-selftest-rlock.h"
 238 GENERATE_TESTCASE(AA_rlock)
 239 #include "locking-selftest-mutex.h"
 240 GENERATE_TESTCASE(AA_mutex)
 241 #include "locking-selftest-wsem.h"
 242 GENERATE_TESTCASE(AA_wsem)
 243 #include "locking-selftest-rsem.h"
 244 GENERATE_TESTCASE(AA_rsem)
 245
 246 #undef E
 247
 248 /*
 249  * Special-case for read-locking, they are
 250  * allowed to recurse on the same lock class:
 251  */
 252 static void rlock_AA1(void)
 253 {
 254         RL(X1);
 255         RL(X1); // this one should NOT fail
 256 }
 257
 258 static void rlock_AA1B(void)
 259 {
 260         RL(X1);
 261         RL(X2); // this one should NOT fail
 262 }
 263
 264 static void rsem_AA1(void)
 265 {
 266         RSL(X1);
 267         RSL(X1); // this one should fail
 268 }
 269
 270 static void rsem_AA1B(void)
 271 {
 272         RSL(X1);
 273         RSL(X2); // this one should fail
 274 }
 275 /*
 276  * The mixing of read and write locks is not allowed:
 277  */
 278 static void rlock_AA2(void)
 279 {
 280         RL(X1);
 281         WL(X2); // this one should fail
 282 }
 283
 284 static void rsem_AA2(void)
 285 {
 286         RSL(X1);
 287         WSL(X2); // this one should fail
 288 }
 289
 290 static void rlock_AA3(void)
 291 {
 292         WL(X1);
 293         RL(X2); // this one should fail
 294 }
 295
 296 static void rsem_AA3(void)
 297 {
 298         WSL(X1);
 299         RSL(X2); // this one should fail
 300 }
 301
 302 /*
 303  * ABBA deadlock:
 304  */
 305
 306 #define E()                                     \
 307                                                 \
 308         LOCK_UNLOCK_2(A, B);                    \
 309         LOCK_UNLOCK_2(B, A); /* fail */
 310
 311 /*
 312  * 6 testcases:
 313  */
 314 #include "locking-selftest-spin.h"
 315 GENERATE_TESTCASE(ABBA_spin)
 316 #include "locking-selftest-wlock.h"
 317 GENERATE_TESTCASE(ABBA_wlock)
 318 #include "locking-selftest-rlock.h"
 319 GENERATE_TESTCASE(ABBA_rlock)
 320 #include "locking-selftest-mutex.h"
 321 GENERATE_TESTCASE(ABBA_mutex)
 322 #include "locking-selftest-wsem.h"
 323 GENERATE_TESTCASE(ABBA_wsem)
 324 #include "locking-selftest-rsem.h"
 325 GENERATE_TESTCASE(ABBA_rsem)
 326
 327 #undef E
 328
 329 /*
 330  * AB BC CA deadlock:
 331  */
 332
 333 #define E()                                     \
 334                                                 \
 335         LOCK_UNLOCK_2(A, B);                    \
 336         LOCK_UNLOCK_2(B, C);                    \
 337         LOCK_UNLOCK_2(C, A); /* fail */
 338
 339 /*
 340  * 6 testcases:
 341  */
 342 #include "locking-selftest-spin.h"
 343 GENERATE_TESTCASE(ABBCCA_spin)
 344 #include "locking-selftest-wlock.h"
 345 GENERATE_TESTCASE(ABBCCA_wlock)
 346 #include "locking-selftest-rlock.h"
 347 GENERATE_TESTCASE(ABBCCA_rlock)
 348 #include "locking-selftest-mutex.h"
 349 GENERATE_TESTCASE(ABBCCA_mutex)
 350 #include "locking-selftest-wsem.h"
 351 GENERATE_TESTCASE(ABBCCA_wsem)
 352 #include "locking-selftest-rsem.h"
 353 GENERATE_TESTCASE(ABBCCA_rsem)
 354
 355 #undef E
 356
 357 /*
 358  * AB CA BC deadlock:
 359  */
 360
 361 #define E()                                     \
 362                                                 \
 363         LOCK_UNLOCK_2(A, B);                    \
 364         LOCK_UNLOCK_2(C, A);                    \
 365         LOCK_UNLOCK_2(B, C); /* fail */
 366
 367 /*
 368  * 6 testcases:
 369  */
 370 #include "locking-selftest-spin.h"
 371 GENERATE_TESTCASE(ABCABC_spin)
 372 #include "locking-selftest-wlock.h"
 373 GENERATE_TESTCASE(ABCABC_wlock)
 374 #include "locking-selftest-rlock.h"
 375 GENERATE_TESTCASE(ABCABC_rlock)
 376 #include "locking-selftest-mutex.h"
 377 GENERATE_TESTCASE(ABCABC_mutex)
 378 #include "locking-selftest-wsem.h"
 379 GENERATE_TESTCASE(ABCABC_wsem)
 380 #include "locking-selftest-rsem.h"
 381 GENERATE_TESTCASE(ABCABC_rsem)
 382
 383 #undef E
 384
 385 /*
 386  * AB BC CD DA deadlock:
 387  */
 388
 389 #define E()                                     \
 390                                                 \
 391         LOCK_UNLOCK_2(A, B);                    \
 392         LOCK_UNLOCK_2(B, C);                    \
 393         LOCK_UNLOCK_2(C, D);                    \
 394         LOCK_UNLOCK_2(D, A); /* fail */
 395
 396 /*
 397  * 6 testcases:
 398  */
 399 #include "locking-selftest-spin.h"
 400 GENERATE_TESTCASE(ABBCCDDA_spin)
 401 #include "locking-selftest-wlock.h"
 402 GENERATE_TESTCASE(ABBCCDDA_wlock)
 403 #include "locking-selftest-rlock.h"
 404 GENERATE_TESTCASE(ABBCCDDA_rlock)
 405 #include "locking-selftest-mutex.h"
 406 GENERATE_TESTCASE(ABBCCDDA_mutex)
 407 #include "locking-selftest-wsem.h"
 408 GENERATE_TESTCASE(ABBCCDDA_wsem)
 409 #include "locking-selftest-rsem.h"
 410 GENERATE_TESTCASE(ABBCCDDA_rsem)
 411
 412 #undef E
 413
 414 /*
 415  * AB CD BD DA deadlock:
 416  */
 417 #define E()                                     \
 418                                                 \
 419         LOCK_UNLOCK_2(A, B);                    \
 420         LOCK_UNLOCK_2(C, D);                    \
 421         LOCK_UNLOCK_2(B, D);                    \
 422         LOCK_UNLOCK_2(D, A); /* fail */
 423
 424 /*
 425  * 6 testcases:
 426  */
 427 #include "locking-selftest-spin.h"
 428 GENERATE_TESTCASE(ABCDBDDA_spin)
 429 #include "locking-selftest-wlock.h"
 430 GENERATE_TESTCASE(ABCDBDDA_wlock)
 431 #include "locking-selftest-rlock.h"
 432 GENERATE_TESTCASE(ABCDBDDA_rlock)
 433 #include "locking-selftest-mutex.h"
 434 GENERATE_TESTCASE(ABCDBDDA_mutex)
 435 #include "locking-selftest-wsem.h"
 436 GENERATE_TESTCASE(ABCDBDDA_wsem)
 437 #include "locking-selftest-rsem.h"
 438 GENERATE_TESTCASE(ABCDBDDA_rsem)
 439
 440 #undef E
 441
 442 /*
 443  * AB CD BC DA deadlock:
 444  */
 445 #define E()                                     \
 446                                                 \
 447         LOCK_UNLOCK_2(A, B);                    \
 448         LOCK_UNLOCK_2(C, D);                    \
 449         LOCK_UNLOCK_2(B, C);                    \
 450         LOCK_UNLOCK_2(D, A); /* fail */
 451
 452 /*
 453  * 6 testcases:
 454  */
 455 #include "locking-selftest-spin.h"
 456 GENERATE_TESTCASE(ABCDBCDA_spin)
 457 #include "locking-selftest-wlock.h"
 458 GENERATE_TESTCASE(ABCDBCDA_wlock)
 459 #include "locking-selftest-rlock.h"
 460 GENERATE_TESTCASE(ABCDBCDA_rlock)
 461 #include "locking-selftest-mutex.h"
 462 GENERATE_TESTCASE(ABCDBCDA_mutex)
 463 #include "locking-selftest-wsem.h"
 464 GENERATE_TESTCASE(ABCDBCDA_wsem)
 465 #include "locking-selftest-rsem.h"
 466 GENERATE_TESTCASE(ABCDBCDA_rsem)
 467
 468 #undef E
 469
 470 /*
 471  * Double unlock:
 472  */
 473 #define E()                                     \
 474                                                 \
 475         LOCK(A);                                \
 476         UNLOCK(A);                              \
 477         UNLOCK(A); /* fail */
 478
 479 /*
 480  * 6 testcases:
 481  */
 482 #include "locking-selftest-spin.h"
 483 GENERATE_TESTCASE(double_unlock_spin)
 484 #include "locking-selftest-wlock.h"
 485 GENERATE_TESTCASE(double_unlock_wlock)
 486 #include "locking-selftest-rlock.h"
 487 GENERATE_TESTCASE(double_unlock_rlock)
 488 #include "locking-selftest-mutex.h"
 489 GENERATE_TESTCASE(double_unlock_mutex)
 490 #include "locking-selftest-wsem.h"
 491 GENERATE_TESTCASE(double_unlock_wsem)
 492 #include "locking-selftest-rsem.h"
 493 GENERATE_TESTCASE(double_unlock_rsem)
 494
 495 #undef E
 496
 497 /*
 498  * Bad unlock ordering:
 499  */
 500 #define E()                                     \
 501                                                 \
 502         LOCK(A);                                \
 503         LOCK(B);                                \
 504         UNLOCK(A); /* fail */                   \
 505         UNLOCK(B);
 506
 507 /*
 508  * 6 testcases:
 509  */
 510 #include "locking-selftest-spin.h"
 511 GENERATE_TESTCASE(bad_unlock_order_spin)
 512 #include "locking-selftest-wlock.h"
 513 GENERATE_TESTCASE(bad_unlock_order_wlock)
 514 #include "locking-selftest-rlock.h"
 515 GENERATE_TESTCASE(bad_unlock_order_rlock)
 516 #include "locking-selftest-mutex.h"
 517 GENERATE_TESTCASE(bad_unlock_order_mutex)
 518 #include "locking-selftest-wsem.h"
 519 GENERATE_TESTCASE(bad_unlock_order_wsem)
 520 #include "locking-selftest-rsem.h"
 521 GENERATE_TESTCASE(bad_unlock_order_rsem)
 522
 523 #undef E
 524
 525 /*
 526  * initializing a held lock:
 527  */
 528 #define E()                                     \
 529                                                 \
 530         LOCK(A);                                \
 531         INIT(A); /* fail */
 532
 533 /*
 534  * 6 testcases:
 535  */
 536 #include "locking-selftest-spin.h"
 537 GENERATE_TESTCASE(init_held_spin)
 538 #include "locking-selftest-wlock.h"
 539 GENERATE_TESTCASE(init_held_wlock)
 540 #include "locking-selftest-rlock.h"
 541 GENERATE_TESTCASE(init_held_rlock)
 542 #include "locking-selftest-mutex.h"
 543 GENERATE_TESTCASE(init_held_mutex)
 544 #include "locking-selftest-wsem.h"
 545 GENERATE_TESTCASE(init_held_wsem)
 546 #include "locking-selftest-rsem.h"
 547 GENERATE_TESTCASE(init_held_rsem)
 548
 549 #undef E
 550
 551 /*
 552  * locking an irq-safe lock with irqs enabled:
 553  */
 554 #define E1()                            \
 555                                         \
 556         IRQ_ENTER();                    \
 557         LOCK(A);                        \
 558         UNLOCK(A);                      \
 559         IRQ_EXIT();
 560
 561 #define E2()                            \
 562                                         \
 563         LOCK(A);                        \
 564         UNLOCK(A);
 565
 566 /*
 567  * Generate 24 testcases:
 568  */
 569 #include "locking-selftest-spin-hardirq.h"
 570 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin)
 571
 572 #include "locking-selftest-rlock-hardirq.h"
 573 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock)
 574
 575 #include "locking-selftest-wlock-hardirq.h"
 576 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_wlock)
 577
 578 #include "locking-selftest-spin-softirq.h"
 579 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_spin)
 580
 581 #include "locking-selftest-rlock-softirq.h"
 582 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_rlock)
 583
 584 #include "locking-selftest-wlock-softirq.h"
 585 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_wlock)
 586
 587 #undef E1
 588 #undef E2
 589
 590 /*
 591  * Enabling hardirqs with a softirq-safe lock held:
 592  */
 593 #define E1()                            \
 594                                         \
 595         SOFTIRQ_ENTER();                \
 596         LOCK(A);                        \
 597         UNLOCK(A);                      \
 598         SOFTIRQ_EXIT();
 599
 600 #define E2()                            \
 601                                         \
 602         HARDIRQ_DISABLE();              \
 603         LOCK(A);                        \
 604         HARDIRQ_ENABLE();               \
 605         UNLOCK(A);
 606
 607 /*
 608  * Generate 12 testcases:
 609  */
 610 #include "locking-selftest-spin.h"
 611 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_spin)
 612
 613 #include "locking-selftest-wlock.h"
 614 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_wlock)
 615
 616 #include "locking-selftest-rlock.h"
 617 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_rlock)
 618
 619 #undef E1
 620 #undef E2
 621
 622 /*
 623  * Enabling irqs with an irq-safe lock held:
 624  */
 625 #define E1()                            \
 626                                         \
 627         IRQ_ENTER();                    \
 628         LOCK(A);                        \
 629         UNLOCK(A);                      \
 630         IRQ_EXIT();
 631
 632 #define E2()                            \
 633                                         \
 634         IRQ_DISABLE();                  \
 635         LOCK(A);                        \
 636         IRQ_ENABLE();                   \
 637         UNLOCK(A);
 638
 639 /*
 640  * Generate 24 testcases:
 641  */
 642 #include "locking-selftest-spin-hardirq.h"
 643 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_spin)
 644
 645 #include "locking-selftest-rlock-hardirq.h"
 646 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_rlock)
 647
 648 #include "locking-selftest-wlock-hardirq.h"
 649 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_wlock)
 650
 651 #include "locking-selftest-spin-softirq.h"
 652 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_spin)
 653
 654 #include "locking-selftest-rlock-softirq.h"
 655 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_rlock)
 656
 657 #include "locking-selftest-wlock-softirq.h"
 658 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock)
 659
 660 #undef E1
 661 #undef E2
 662
 663 /*
 664  * Acquiring a irq-unsafe lock while holding an irq-safe-lock:
 665  */
 666 #define E1()                            \
 667                                         \
 668         LOCK(A);                        \
 669         LOCK(B);                        \
 670         UNLOCK(B);                      \
 671         UNLOCK(A);                      \
 672
 673 #define E2()                            \
 674                                         \
 675         LOCK(B);                        \
 676         UNLOCK(B);
 677
 678 #define E3()                            \
 679                                         \
 680         IRQ_ENTER();                    \
 681         LOCK(A);                        \
 682         UNLOCK(A);                      \
 683         IRQ_EXIT();
 684
 685 /*
 686  * Generate 36 testcases:
 687  */
 688 #include "locking-selftest-spin-hardirq.h"
 689 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_spin)
 690
 691 #include "locking-selftest-rlock-hardirq.h"
 692 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_rlock)
 693
 694 #include "locking-selftest-wlock-hardirq.h"
 695 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_wlock)
 696
 697 #include "locking-selftest-spin-softirq.h"
 698 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_spin)
 699
 700 #include "locking-selftest-rlock-softirq.h"
 701 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_rlock)
 702
 703 #include "locking-selftest-wlock-softirq.h"
 704 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock)
 705
 706 #undef E1
 707 #undef E2
 708 #undef E3
 709
 710 /*
 711  * If a lock turns into softirq-safe, but earlier it took
 712  * a softirq-unsafe lock:
 713  */
 714
 715 #define E1()                            \
 716         IRQ_DISABLE();                  \
 717         LOCK(A);                        \
 718         LOCK(B);                        \
 719         UNLOCK(B);                      \
 720         UNLOCK(A);                      \
 721         IRQ_ENABLE();
 722
 723 #define E2()                            \
 724         LOCK(B);                        \
 725         UNLOCK(B);
 726
 727 #define E3()                            \
 728         IRQ_ENTER();                    \
 729         LOCK(A);                        \
 730         UNLOCK(A);                      \
 731         IRQ_EXIT();
 732
 733 /*
 734  * Generate 36 testcases:
 735  */
 736 #include "locking-selftest-spin-hardirq.h"
 737 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_spin)
 738
 739 #include "locking-selftest-rlock-hardirq.h"
 740 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_rlock)
 741
 742 #include "locking-selftest-wlock-hardirq.h"
 743 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_wlock)
 744
 745 #include "locking-selftest-spin-softirq.h"
 746 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_spin)
 747
 748 #include "locking-selftest-rlock-softirq.h"
 749 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_rlock)
 750
 751 #include "locking-selftest-wlock-softirq.h"
 752 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_wlock)
 753
 754 #undef E1
 755 #undef E2
 756 #undef E3
 757
 758 /*
 759  * read-lock / write-lock irq inversion.
 760  *
 761  * Deadlock scenario:
 762  *
 763  * CPU#1 is at #1, i.e. it has write-locked A, but has not
 764  * taken B yet.
 765  *
 766  * CPU#2 is at #2, i.e. it has locked B.
 767  *
 768  * Hardirq hits CPU#2 at point #2 and is trying to read-lock A.
 769  *
 770  * The deadlock occurs because CPU#1 will spin on B, and CPU#2
 771  * will spin on A.
 772  */
 773
 774 #define E1()                            \
 775                                         \
 776         IRQ_DISABLE();                  \
 777         WL(A);                          \
 778         LOCK(B);                        \
 779         UNLOCK(B);                      \
 780         WU(A);                          \
 781         IRQ_ENABLE();
 782
 783 #define E2()                            \
 784                                         \
 785         LOCK(B);                        \
 786         UNLOCK(B);
 787
 788 #define E3()                            \
 789                                         \
 790         IRQ_ENTER();                    \
 791         RL(A);                          \
 792         RU(A);                          \
 793         IRQ_EXIT();
 794
 795 /*
 796  * Generate 36 testcases:
 797  */
 798 #include "locking-selftest-spin-hardirq.h"
 799 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_spin)
 800
 801 #include "locking-selftest-rlock-hardirq.h"
 802 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_rlock)
 803
 804 #include "locking-selftest-wlock-hardirq.h"
 805 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_wlock)
 806
 807 #include "locking-selftest-spin-softirq.h"
 808 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_spin)
 809
 810 #include "locking-selftest-rlock-softirq.h"
 811 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_rlock)
 812
 813 #include "locking-selftest-wlock-softirq.h"
 814 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_wlock)
 815
 816 #undef E1
 817 #undef E2
 818 #undef E3
 819
 820 /*
 821  * read-lock / write-lock recursion that is actually safe.
 822  */
 823
 824 #define E1()                            \
 825                                         \
 826         IRQ_DISABLE();                  \
 827         WL(A);                          \
 828         WU(A);                          \
 829         IRQ_ENABLE();
 830
 831 #define E2()                            \
 832                                         \
 833         RL(A);                          \
 834         RU(A);                          \
 835
 836 #define E3()                            \
 837                                         \
 838         IRQ_ENTER();                    \
 839         RL(A);                          \
 840         L(B);                           \
 841         U(B);                           \
 842         RU(A);                          \
 843         IRQ_EXIT();
 844
 845 /*
 846  * Generate 12 testcases:
 847  */
 848 #include "locking-selftest-hardirq.h"
 849 GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard)
 850
 851 #include "locking-selftest-softirq.h"
 852 GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft)
 853
 854 #undef E1
 855 #undef E2
 856 #undef E3
 857
 858 /*
 859  * read-lock / write-lock recursion that is unsafe.
 860  */
 861
 862 #define E1()                            \
 863                                         \
 864         IRQ_DISABLE();                  \
 865         L(B);                           \
 866         WL(A);                          \
 867         WU(A);                          \
 868         U(B);                           \
 869         IRQ_ENABLE();
 870
 871 #define E2()                            \
 872                                         \
 873         RL(A);                          \
 874         RU(A);                          \
 875
 876 #define E3()                            \
 877                                         \
 878         IRQ_ENTER();                    \
 879         L(B);                           \
 880         U(B);                           \
 881         IRQ_EXIT();
 882
 883 /*
 884  * Generate 12 testcases:
 885  */
 886 #include "locking-selftest-hardirq.h"
 887 // GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard)
 888
 889 #include "locking-selftest-softirq.h"
 890 // GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft)
 891
 892 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 893 # define I_SPINLOCK(x)  lockdep_reset_lock(&lock_##x.dep_map)
 894 # define I_RWLOCK(x)    lockdep_reset_lock(&rwlock_##x.dep_map)
 895 # define I_MUTEX(x)     lockdep_reset_lock(&mutex_##x.dep_map)
 896 # define I_RWSEM(x)     lockdep_reset_lock(&rwsem_##x.dep_map)
 897 #else
 898 # define I_SPINLOCK(x)
 899 # define I_RWLOCK(x)
 900 # define I_MUTEX(x)
 901 # define I_RWSEM(x)
 902 #endif
 903
 904 #define I1(x)                                   \
 905         do {                                    \
 906                 I_SPINLOCK(x);                  \
 907                 I_RWLOCK(x);                    \
 908                 I_MUTEX(x);                     \
 909                 I_RWSEM(x);                     \
 910         } while (0)
 911
 912 #define I2(x)                                   \
 913         do {                                    \
 914                 spin_lock_init(&lock_##x);      \
 915                 rwlock_init(&rwlock_##x);       \
 916                 mutex_init(&mutex_##x);         \
 917                 init_rwsem(&rwsem_##x);         \
 918         } while (0)
 919
 920 static void reset_locks(void)
 921 {
 922         local_irq_disable();
 923         I1(A); I1(B); I1(C); I1(D);
 924         I1(X1); I1(X2); I1(Y1); I1(Y2); I1(Z1); I1(Z2);
 925         lockdep_reset();
 926         I2(A); I2(B); I2(C); I2(D);
 927         init_shared_classes();
 928         local_irq_enable();
 929 }
 930
 931 #undef I
 932
 933 static int testcase_total;
 934 static int testcase_successes;
 935 static int expected_testcase_failures;
 936 static int unexpected_testcase_failures;
 937
 938 static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask)
 939 {
 940         unsigned long saved_preempt_count = preempt_count();
 941         int expected_failure = 0;
 942
 943         WARN_ON(irqs_disabled());
 944
 945         testcase_fn();
 946         /*
 947          * Filter out expected failures:
 948          */
 949 #ifndef CONFIG_PROVE_LOCKING
 950         if ((lockclass_mask & LOCKTYPE_SPIN) && debug_locks != expected)
 951                 expected_failure = 1;
 952         if ((lockclass_mask & LOCKTYPE_RWLOCK) && debug_locks != expected)
 953                 expected_failure = 1;
 954         if ((lockclass_mask & LOCKTYPE_MUTEX) && debug_locks != expected)
 955                 expected_failure = 1;
 956         if ((lockclass_mask & LOCKTYPE_RWSEM) && debug_locks != expected)
 957                 expected_failure = 1;
 958 #endif
 959         if (debug_locks != expected) {
 960                 if (expected_failure) {
 961                         expected_testcase_failures++;
 962                         printk("failed|");
 963                 } else {
 964                         unexpected_testcase_failures++;
 965
 966                         printk("FAILED|");
 967                         dump_stack();
 968                 }
 969         } else {
 970                 testcase_successes++;
 971                 printk("  ok  |");
 972         }
 973         testcase_total++;
 974
 975         if (debug_locks_verbose)
 976                 printk(" lockclass mask: %x, debug_locks: %d, expected: %d\n",
 977                         lockclass_mask, debug_locks, expected);
 978         /*
 979          * Some tests (e.g. double-unlock) might corrupt the preemption
 980          * count, so restore it:
 981          */
 982         preempt_count() = saved_preempt_count;
 983 #ifdef CONFIG_TRACE_IRQFLAGS
 984         if (softirq_count())
 985                 current->softirqs_enabled = 0;
 986         else
 987                 current->softirqs_enabled = 1;
 988 #endif
 989
 990         reset_locks();
 991 }
 992
 993 static inline void print_testname(const char *testname)
 994 {
 995         printk("%33s:", testname);
 996 }
 997
 998 #define DO_TESTCASE_1(desc, name, nr)                           \
 999         print_testname(desc"/"#nr);                             \
1000         dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK);          \
1001         printk("\n");
1002
1003 #define DO_TESTCASE_1B(desc, name, nr)                          \
1004         print_testname(desc"/"#nr);                             \
1005         dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK);          \
1006         printk("\n");
1007
1008 #define DO_TESTCASE_3(desc, name, nr)                           \
1009         print_testname(desc"/"#nr);                             \
1010         dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN);       \
1011         dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK);    \
1012         dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK);    \
1013         printk("\n");
1014
1015 #define DO_TESTCASE_3RW(desc, name, nr)                         \
1016         print_testname(desc"/"#nr);                             \
1017         dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN|LOCKTYPE_RWLOCK);\
1018         dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK);    \
1019         dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK);    \
1020         printk("\n");
1021
1022 #define DO_TESTCASE_6(desc, name)                               \
1023         print_testname(desc);                                   \
1024         dotest(name##_spin, FAILURE, LOCKTYPE_SPIN);            \
1025         dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK);         \
1026         dotest(name##_rlock, FAILURE, LOCKTYPE_RWLOCK);         \
1027         dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX);          \
1028         dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM);           \
1029         dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM);           \
1030         printk("\n");
1031
1032 #define DO_TESTCASE_6_SUCCESS(desc, name)                       \
1033         print_testname(desc);                                   \
1034         dotest(name##_spin, SUCCESS, LOCKTYPE_SPIN);            \
1035         dotest(name##_wlock, SUCCESS, LOCKTYPE_RWLOCK);         \
1036         dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK);         \
1037         dotest(name##_mutex, SUCCESS, LOCKTYPE_MUTEX);          \
1038         dotest(name##_wsem, SUCCESS, LOCKTYPE_RWSEM);           \
1039         dotest(name##_rsem, SUCCESS, LOCKTYPE_RWSEM);           \
1040         printk("\n");
1041
1042 /*
1043  * 'read' variant: rlocks must not trigger.
1044  */
1045 #define DO_TESTCASE_6R(desc, name)                              \
1046         print_testname(desc);                                   \
1047         dotest(name##_spin, FAILURE, LOCKTYPE_SPIN);            \
1048         dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK);         \
1049         dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK);         \
1050         dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX);          \
1051         dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM);           \
1052         dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM);           \
1053         printk("\n");
1054
1055 #define DO_TESTCASE_2I(desc, name, nr)                          \
1056         DO_TESTCASE_1("hard-"desc, name##_hard, nr);            \
1057         DO_TESTCASE_1("soft-"desc, name##_soft, nr);
1058
1059 #define DO_TESTCASE_2IB(desc, name, nr)                         \
1060         DO_TESTCASE_1B("hard-"desc, name##_hard, nr);           \
1061         DO_TESTCASE_1B("soft-"desc, name##_soft, nr);
1062
1063 #define DO_TESTCASE_6I(desc, name, nr)                          \
1064         DO_TESTCASE_3("hard-"desc, name##_hard, nr);            \
1065         DO_TESTCASE_3("soft-"desc, name##_soft, nr);
1066
1067 #define DO_TESTCASE_6IRW(desc, name, nr)                        \
1068         DO_TESTCASE_3RW("hard-"desc, name##_hard, nr);          \
1069         DO_TESTCASE_3RW("soft-"desc, name##_soft, nr);
1070
1071 #define DO_TESTCASE_2x3(desc, name)                             \
1072         DO_TESTCASE_3(desc, name, 12);                          \
1073         DO_TESTCASE_3(desc, name, 21);
1074
1075 #define DO_TESTCASE_2x6(desc, name)                             \
1076         DO_TESTCASE_6I(desc, name, 12);                         \
1077         DO_TESTCASE_6I(desc, name, 21);
1078
1079 #define DO_TESTCASE_6x2(desc, name)                             \
1080         DO_TESTCASE_2I(desc, name, 123);                        \
1081         DO_TESTCASE_2I(desc, name, 132);                        \
1082         DO_TESTCASE_2I(desc, name, 213);                        \
1083         DO_TESTCASE_2I(desc, name, 231);                        \
1084         DO_TESTCASE_2I(desc, name, 312);                        \
1085         DO_TESTCASE_2I(desc, name, 321);
1086
1087 #define DO_TESTCASE_6x2B(desc, name)                            \
1088         DO_TESTCASE_2IB(desc, name, 123);                       \
1089         DO_TESTCASE_2IB(desc, name, 132);                       \
1090         DO_TESTCASE_2IB(desc, name, 213);                       \
1091         DO_TESTCASE_2IB(desc, name, 231);                       \
1092         DO_TESTCASE_2IB(desc, name, 312);                       \
1093         DO_TESTCASE_2IB(desc, name, 321);
1094
1095 #define DO_TESTCASE_6x6(desc, name)                             \
1096         DO_TESTCASE_6I(desc, name, 123);                        \
1097         DO_TESTCASE_6I(desc, name, 132);                        \
1098         DO_TESTCASE_6I(desc, name, 213);                        \
1099         DO_TESTCASE_6I(desc, name, 231);                        \
1100         DO_TESTCASE_6I(desc, name, 312);                        \
1101         DO_TESTCASE_6I(desc, name, 321);
1102
1103 #define DO_TESTCASE_6x6RW(desc, name)                           \
1104         DO_TESTCASE_6IRW(desc, name, 123);                      \
1105         DO_TESTCASE_6IRW(desc, name, 132);                      \
1106         DO_TESTCASE_6IRW(desc, name, 213);                      \
1107         DO_TESTCASE_6IRW(desc, name, 231);                      \
1108         DO_TESTCASE_6IRW(desc, name, 312);                      \
1109         DO_TESTCASE_6IRW(desc, name, 321);
1110
1111
1112 void locking_selftest(void)
1113 {
1114         /*
1115          * Got a locking failure before the selftest ran?
1116          */
1117         if (!debug_locks) {
1118                 printk("----------------------------------\n");
1119                 printk("| Locking API testsuite disabled |\n");
1120                 printk("----------------------------------\n");
1121                 return;
1122         }
1123
1124         /*
1125          * Run the testsuite:
1126          */
1127         printk("------------------------\n");
1128         printk("| Locking API testsuite:\n");
1129         printk("----------------------------------------------------------------------------\n");
1130         printk("                                 | spin |wlock |rlock |mutex | wsem | rsem |\n");
1131         printk("  --------------------------------------------------------------------------\n");
1132
1133         init_shared_classes();
1134         debug_locks_silent = !debug_locks_verbose;
1135
1136         DO_TESTCASE_6R("A-A deadlock", AA);
1137         DO_TESTCASE_6R("A-B-B-A deadlock", ABBA);
1138         DO_TESTCASE_6R("A-B-B-C-C-A deadlock", ABBCCA);
1139         DO_TESTCASE_6R("A-B-C-A-B-C deadlock", ABCABC);
1140         DO_TESTCASE_6R("A-B-B-C-C-D-D-A deadlock", ABBCCDDA);
1141         DO_TESTCASE_6R("A-B-C-D-B-D-D-A deadlock", ABCDBDDA);
1142         DO_TESTCASE_6R("A-B-C-D-B-C-D-A deadlock", ABCDBCDA);
1143         DO_TESTCASE_6("double unlock", double_unlock);
1144         DO_TESTCASE_6("initialize held", init_held);
1145         DO_TESTCASE_6_SUCCESS("bad unlock order", bad_unlock_order);
1146
1147         printk("  --------------------------------------------------------------------------\n");
1148         print_testname("recursive read-lock");
1149         printk("             |");
1150         dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK);
1151         printk("             |");
1152         dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM);
1153         printk("\n");
1154
1155         print_testname("recursive read-lock #2");
1156         printk("             |");
1157         dotest(rlock_AA1B, SUCCESS, LOCKTYPE_RWLOCK);
1158         printk("             |");
1159         dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM);
1160         printk("\n");
1161
1162         print_testname("mixed read-write-lock");
1163         printk("             |");
1164         dotest(rlock_AA2, FAILURE, LOCKTYPE_RWLOCK);
1165         printk("             |");
1166         dotest(rsem_AA2, FAILURE, LOCKTYPE_RWSEM);
1167         printk("\n");
1168
1169         print_testname("mixed write-read-lock");
1170         printk("             |");
1171         dotest(rlock_AA3, FAILURE, LOCKTYPE_RWLOCK);
1172         printk("             |");
1173         dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM);
1174         printk("\n");
1175
1176         printk("  --------------------------------------------------------------------------\n");
1177
1178         /*
1179          * irq-context testcases:
1180          */
1181         DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1);
1182         DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A);
1183         DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B);
1184         DO_TESTCASE_6x6("safe-A + unsafe-B #1", irqsafe3);
1185         DO_TESTCASE_6x6("safe-A + unsafe-B #2", irqsafe4);
1186         DO_TESTCASE_6x6RW("irq lock-inversion", irq_inversion);
1187
1188         DO_TESTCASE_6x2("irq read-recursion", irq_read_recursion);
1189 //      DO_TESTCASE_6x2B("irq read-recursion #2", irq_read_recursion2);
1190
1191         if (unexpected_testcase_failures) {
1192                 printk("-----------------------------------------------------------------\n");
1193                 debug_locks = 0;
1194                 printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n",
1195                         unexpected_testcase_failures, testcase_total);
1196                 printk("-----------------------------------------------------------------\n");
1197         } else if (expected_testcase_failures && testcase_successes) {
1198                 printk("--------------------------------------------------------\n");
1199                 printk("%3d out of %3d testcases failed, as expected. |\n",
1200                         expected_testcase_failures, testcase_total);
1201                 printk("----------------------------------------------------\n");
1202                 debug_locks = 1;
1203         } else if (expected_testcase_failures && !testcase_successes) {
1204                 printk("--------------------------------------------------------\n");
1205                 printk("All %3d testcases failed, as expected. |\n",
1206                         expected_testcase_failures);
1207                 printk("----------------------------------------\n");
1208                 debug_locks = 1;
1209         } else {
1210                 printk("-------------------------------------------------------\n");
1211                 printk("Good, all %3d testcases passed! |\n",
1212                         testcase_successes);
1213                 printk("---------------------------------\n");
1214                 debug_locks = 1;
1215         }
1216         debug_locks_silent = 0;
1217 }