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/module.h>
  18 #include <linux/lockdep.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/kallsyms.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/debug_locks.h>
  23 #include <linux/irqflags.h>
  24
  25 /*
  26  * Change this to 1 if you want to see the failure printouts:
  27  */
  28 static unsigned int debug_locks_verbose;
  29
  30 static int __init setup_debug_locks_verbose(char *str)
  31 {
  32         get_option(&str, &debug_locks_verbose);
  33
  34         return 1;
  35 }
  36
  37 __setup("debug_locks_verbose=", setup_debug_locks_verbose);
  38
  39 #define FAILURE         0
  40 #define SUCCESS         1
  41
  42 #define LOCKTYPE_SPIN   0x1
  43 #define LOCKTYPE_RWLOCK 0x2
  44 #define LOCKTYPE_MUTEX  0x4
  45 #define LOCKTYPE_RWSEM  0x8
  46
  47 /*
  48  * Normal standalone locks, for the circular and irq-context
  49  * dependency tests:
  50  */
  51 static DEFINE_SPINLOCK(lock_A);
  52 static DEFINE_SPINLOCK(lock_B);
  53 static DEFINE_SPINLOCK(lock_C);
  54 static DEFINE_SPINLOCK(lock_D);
  55
  56 static DEFINE_RWLOCK(rwlock_A);
  57 static DEFINE_RWLOCK(rwlock_B);
  58 static DEFINE_RWLOCK(rwlock_C);
  59 static DEFINE_RWLOCK(rwlock_D);
  60
  61 static DEFINE_MUTEX(mutex_A);
  62 static DEFINE_MUTEX(mutex_B);
  63 static DEFINE_MUTEX(mutex_C);
  64 static DEFINE_MUTEX(mutex_D);
  65
  66 static DECLARE_RWSEM(rwsem_A);
  67 static DECLARE_RWSEM(rwsem_B);
  68 static DECLARE_RWSEM(rwsem_C);
  69 static DECLARE_RWSEM(rwsem_D);
  70
  71 /*
  72  * Locks that we initialize dynamically as well so that
  73  * e.g. X1 and X2 becomes two instances of the same class,
  74  * but X* and Y* are different classes. We do this so that
  75  * we do not trigger a real lockup:
  76  */
  77 static DEFINE_SPINLOCK(lock_X1);
  78 static DEFINE_SPINLOCK(lock_X2);
  79 static DEFINE_SPINLOCK(lock_Y1);
  80 static DEFINE_SPINLOCK(lock_Y2);
  81 static DEFINE_SPINLOCK(lock_Z1);
  82 static DEFINE_SPINLOCK(lock_Z2);
  83
  84 static DEFINE_RWLOCK(rwlock_X1);
  85 static DEFINE_RWLOCK(rwlock_X2);
  86 static DEFINE_RWLOCK(rwlock_Y1);
  87 static DEFINE_RWLOCK(rwlock_Y2);
  88 static DEFINE_RWLOCK(rwlock_Z1);
  89 static DEFINE_RWLOCK(rwlock_Z2);
  90
  91 static DEFINE_MUTEX(mutex_X1);
  92 static DEFINE_MUTEX(mutex_X2);
  93 static DEFINE_MUTEX(mutex_Y1);
  94 static DEFINE_MUTEX(mutex_Y2);
  95 static DEFINE_MUTEX(mutex_Z1);
  96 static DEFINE_MUTEX(mutex_Z2);
  97
  98 static DECLARE_RWSEM(rwsem_X1);
  99 static DECLARE_RWSEM(rwsem_X2);
 100 static DECLARE_RWSEM(rwsem_Y1);
 101 static DECLARE_RWSEM(rwsem_Y2);
 102 static DECLARE_RWSEM(rwsem_Z1);
 103 static DECLARE_RWSEM(rwsem_Z2);
 104
 105 /*
 106  * non-inlined runtime initializers, to let separate locks share
 107  * the same lock-class:
 108  */
 109 #define INIT_CLASS_FUNC(class)                          \
 110 static noinline void                                    \
 111 init_class_##class(spinlock_t *lock, rwlock_t *rwlock, struct mutex *mutex, \
 112                  struct rw_semaphore *rwsem)            \
 113 {                                                       \
 114         spin_lock_init(lock);                           \
 115         rwlock_init(rwlock);                            \
 116         mutex_init(mutex);                              \
 117         init_rwsem(rwsem);                              \
 118 }
 119
 120 INIT_CLASS_FUNC(X)
 121 INIT_CLASS_FUNC(Y)
 122 INIT_CLASS_FUNC(Z)
 123
 124 static void init_shared_classes(void)
 125 {
 126         init_class_X(&lock_X1, &rwlock_X1, &mutex_X1, &rwsem_X1);
 127         init_class_X(&lock_X2, &rwlock_X2, &mutex_X2, &rwsem_X2);
 128
 129         init_class_Y(&lock_Y1, &rwlock_Y1, &mutex_Y1, &rwsem_Y1);
 130         init_class_Y(&lock_Y2, &rwlock_Y2, &mutex_Y2, &rwsem_Y2);
 131
 132         init_class_Z(&lock_Z1, &rwlock_Z1, &mutex_Z1, &rwsem_Z1);
 133         init_class_Z(&lock_Z2, &rwlock_Z2, &mutex_Z2, &rwsem_Z2);
 134 }
 135
 136 /*
 137  * For spinlocks and rwlocks we also do hardirq-safe / softirq-safe tests.
 138  * The following functions use a lock from a simulated hardirq/softirq
 139  * context, causing the locks to be marked as hardirq-safe/softirq-safe:
 140  */
 141
 142 #define HARDIRQ_DISABLE         local_irq_disable
 143 #define HARDIRQ_ENABLE          local_irq_enable
 144
 145 #define HARDIRQ_ENTER()                         \
 146         local_irq_disable();                    \
 147         irq_enter();                            \
 148         WARN_ON(!in_irq());
 149
 150 #define HARDIRQ_EXIT()                          \
 151         __irq_exit();                           \
 152         local_irq_enable();
 153
 154 #define SOFTIRQ_DISABLE         local_bh_disable
 155 #define SOFTIRQ_ENABLE          local_bh_enable
 156
 157 #define SOFTIRQ_ENTER()                         \
 158                 local_bh_disable();             \
 159                 local_irq_disable();            \
 160                 lockdep_softirq_enter();        \
 161                 WARN_ON(!in_softirq());
 162
 163 #define SOFTIRQ_EXIT()                          \
 164                 lockdep_softirq_exit();         \
 165                 local_irq_enable();             \
 166                 local_bh_enable();
 167
 168 /*
 169  * Shortcuts for lock/unlock API variants, to keep
 170  * the testcases compact:
 171  */
 172 #define L(x)                    spin_lock(&lock_##x)
 173 #define U(x)                    spin_unlock(&lock_##x)
 174 #define LU(x)                   L(x); U(x)
 175 #define SI(x)                   spin_lock_init(&lock_##x)
 176
 177 #define WL(x)                   write_lock(&rwlock_##x)
 178 #define WU(x)                   write_unlock(&rwlock_##x)
 179 #define WLU(x)                  WL(x); WU(x)
 180
 181 #define RL(x)                   read_lock(&rwlock_##x)
 182 #define RU(x)                   read_unlock(&rwlock_##x)
 183 #define RLU(x)                  RL(x); RU(x)
 184 #define RWI(x)                  rwlock_init(&rwlock_##x)
 185
 186 #define ML(x)                   mutex_lock(&mutex_##x)
 187 #define MU(x)                   mutex_unlock(&mutex_##x)
 188 #define MI(x)                   mutex_init(&mutex_##x)
 189
 190 #define WSL(x)                  down_write(&rwsem_##x)
 191 #define WSU(x)                  up_write(&rwsem_##x)
 192
 193 #define RSL(x)                  down_read(&rwsem_##x)
 194 #define RSU(x)                  up_read(&rwsem_##x)
 195 #define RWSI(x)                 init_rwsem(&rwsem_##x)
 196
 197 #define LOCK_UNLOCK_2(x,y)      LOCK(x); LOCK(y); UNLOCK(y); UNLOCK(x)
 198
 199 /*
 200  * Generate different permutations of the same testcase, using
 201  * the same basic lock-dependency/state events:
 202  */
 203
 204 #define GENERATE_TESTCASE(name)                 \
 205                                                 \
 206 static void name(void) { E(); }
 207
 208 #define GENERATE_PERMUTATIONS_2_EVENTS(name)    \
 209                                                 \
 210 static void name##_12(void) { E1(); E2(); }     \
 211 static void name##_21(void) { E2(); E1(); }
 212
 213 #define GENERATE_PERMUTATIONS_3_EVENTS(name)            \
 214                                                         \
 215 static void name##_123(void) { E1(); E2(); E3(); }      \
 216 static void name##_132(void) { E1(); E3(); E2(); }      \
 217 static void name##_213(void) { E2(); E1(); E3(); }      \
 218 static void name##_231(void) { E2(); E3(); E1(); }      \
 219 static void name##_312(void) { E3(); E1(); E2(); }      \
 220 static void name##_321(void) { E3(); E2(); E1(); }
 221
 222 /*
 223  * AA deadlock:
 224  */
 225
 226 #define E()                                     \
 227                                                 \
 228         LOCK(X1);                               \
 229         LOCK(X2); /* this one should fail */
 230
 231 /*
 232  * 6 testcases:
 233  */
 234 #include "locking-selftest-spin.h"
 235 GENERATE_TESTCASE(AA_spin)
 236 #include "locking-selftest-wlock.h"
 237 GENERATE_TESTCASE(AA_wlock)
 238 #include "locking-selftest-rlock.h"
 239 GENERATE_TESTCASE(AA_rlock)
 240 #include "locking-selftest-mutex.h"
 241 GENERATE_TESTCASE(AA_mutex)
 242 #include "locking-selftest-wsem.h"
 243 GENERATE_TESTCASE(AA_wsem)
 244 #include "locking-selftest-rsem.h"
 245 GENERATE_TESTCASE(AA_rsem)
 246
 247 #undef E
 248
 249 /*
 250  * Special-case for read-locking, they are
 251  * allowed to recurse on the same lock class:
 252  */
 253 static void rlock_AA1(void)
 254 {
 255         RL(X1);
 256         RL(X1); // this one should NOT fail
 257 }
 258
 259 static void rlock_AA1B(void)
 260 {
 261         RL(X1);
 262         RL(X2); // this one should NOT fail
 263 }
 264
 265 static void rsem_AA1(void)
 266 {
 267         RSL(X1);
 268         RSL(X1); // this one should fail
 269 }
 270
 271 static void rsem_AA1B(void)
 272 {
 273         RSL(X1);
 274         RSL(X2); // this one should fail
 275 }
 276 /*
 277  * The mixing of read and write locks is not allowed:
 278  */
 279 static void rlock_AA2(void)
 280 {
 281         RL(X1);
 282         WL(X2); // this one should fail
 283 }
 284
 285 static void rsem_AA2(void)
 286 {
 287         RSL(X1);
 288         WSL(X2); // this one should fail
 289 }
 290
 291 static void rlock_AA3(void)
 292 {
 293         WL(X1);
 294         RL(X2); // this one should fail
 295 }
 296
 297 static void rsem_AA3(void)
 298 {
 299         WSL(X1);
 300         RSL(X2); // this one should fail
 301 }
 302
 303 /*
 304  * ABBA deadlock:
 305  */
 306
 307 #define E()                                     \
 308                                                 \
 309         LOCK_UNLOCK_2(A, B);                    \
 310         LOCK_UNLOCK_2(B, A); /* fail */
 311
 312 /*
 313  * 6 testcases:
 314  */
 315 #include "locking-selftest-spin.h"
 316 GENERATE_TESTCASE(ABBA_spin)
 317 #include "locking-selftest-wlock.h"
 318 GENERATE_TESTCASE(ABBA_wlock)
 319 #include "locking-selftest-rlock.h"
 320 GENERATE_TESTCASE(ABBA_rlock)
 321 #include "locking-selftest-mutex.h"
 322 GENERATE_TESTCASE(ABBA_mutex)
 323 #include "locking-selftest-wsem.h"
 324 GENERATE_TESTCASE(ABBA_wsem)
 325 #include "locking-selftest-rsem.h"
 326 GENERATE_TESTCASE(ABBA_rsem)
 327
 328 #undef E
 329
 330 /*
 331  * AB BC CA deadlock:
 332  */
 333
 334 #define E()                                     \
 335                                                 \
 336         LOCK_UNLOCK_2(A, B);                    \
 337         LOCK_UNLOCK_2(B, C);                    \
 338         LOCK_UNLOCK_2(C, A); /* fail */
 339
 340 /*
 341  * 6 testcases:
 342  */
 343 #include "locking-selftest-spin.h"
 344 GENERATE_TESTCASE(ABBCCA_spin)
 345 #include "locking-selftest-wlock.h"
 346 GENERATE_TESTCASE(ABBCCA_wlock)
 347 #include "locking-selftest-rlock.h"
 348 GENERATE_TESTCASE(ABBCCA_rlock)
 349 #include "locking-selftest-mutex.h"
 350 GENERATE_TESTCASE(ABBCCA_mutex)
 351 #include "locking-selftest-wsem.h"
 352 GENERATE_TESTCASE(ABBCCA_wsem)
 353 #include "locking-selftest-rsem.h"
 354 GENERATE_TESTCASE(ABBCCA_rsem)
 355
 356 #undef E
 357
 358 /*
 359  * AB CA BC deadlock:
 360  */
 361
 362 #define E()                                     \
 363                                                 \
 364         LOCK_UNLOCK_2(A, B);                    \
 365         LOCK_UNLOCK_2(C, A);                    \
 366         LOCK_UNLOCK_2(B, C); /* fail */
 367
 368 /*
 369  * 6 testcases:
 370  */
 371 #include "locking-selftest-spin.h"
 372 GENERATE_TESTCASE(ABCABC_spin)
 373 #include "locking-selftest-wlock.h"
 374 GENERATE_TESTCASE(ABCABC_wlock)
 375 #include "locking-selftest-rlock.h"
 376 GENERATE_TESTCASE(ABCABC_rlock)
 377 #include "locking-selftest-mutex.h"
 378 GENERATE_TESTCASE(ABCABC_mutex)
 379 #include "locking-selftest-wsem.h"
 380 GENERATE_TESTCASE(ABCABC_wsem)
 381 #include "locking-selftest-rsem.h"
 382 GENERATE_TESTCASE(ABCABC_rsem)
 383
 384 #undef E
 385
 386 /*
 387  * AB BC CD DA deadlock:
 388  */
 389
 390 #define E()                                     \
 391                                                 \
 392         LOCK_UNLOCK_2(A, B);                    \
 393         LOCK_UNLOCK_2(B, C);                    \
 394         LOCK_UNLOCK_2(C, D);                    \
 395         LOCK_UNLOCK_2(D, A); /* fail */
 396
 397 /*
 398  * 6 testcases:
 399  */
 400 #include "locking-selftest-spin.h"
 401 GENERATE_TESTCASE(ABBCCDDA_spin)
 402 #include "locking-selftest-wlock.h"
 403 GENERATE_TESTCASE(ABBCCDDA_wlock)
 404 #include "locking-selftest-rlock.h"
 405 GENERATE_TESTCASE(ABBCCDDA_rlock)
 406 #include "locking-selftest-mutex.h"
 407 GENERATE_TESTCASE(ABBCCDDA_mutex)
 408 #include "locking-selftest-wsem.h"
 409 GENERATE_TESTCASE(ABBCCDDA_wsem)
 410 #include "locking-selftest-rsem.h"
 411 GENERATE_TESTCASE(ABBCCDDA_rsem)
 412
 413 #undef E
 414
 415 /*
 416  * AB CD BD DA deadlock:
 417  */
 418 #define E()                                     \
 419                                                 \
 420         LOCK_UNLOCK_2(A, B);                    \
 421         LOCK_UNLOCK_2(C, D);                    \
 422         LOCK_UNLOCK_2(B, D);                    \
 423         LOCK_UNLOCK_2(D, A); /* fail */
 424
 425 /*
 426  * 6 testcases:
 427  */
 428 #include "locking-selftest-spin.h"
 429 GENERATE_TESTCASE(ABCDBDDA_spin)
 430 #include "locking-selftest-wlock.h"
 431 GENERATE_TESTCASE(ABCDBDDA_wlock)
 432 #include "locking-selftest-rlock.h"
 433 GENERATE_TESTCASE(ABCDBDDA_rlock)
 434 #include "locking-selftest-mutex.h"
 435 GENERATE_TESTCASE(ABCDBDDA_mutex)
 436 #include "locking-selftest-wsem.h"
 437 GENERATE_TESTCASE(ABCDBDDA_wsem)
 438 #include "locking-selftest-rsem.h"
 439 GENERATE_TESTCASE(ABCDBDDA_rsem)
 440
 441 #undef E
 442
 443 /*
 444  * AB CD BC DA deadlock:
 445  */
 446 #define E()                                     \
 447                                                 \
 448         LOCK_UNLOCK_2(A, B);                    \
 449         LOCK_UNLOCK_2(C, D);                    \
 450         LOCK_UNLOCK_2(B, C);                    \
 451         LOCK_UNLOCK_2(D, A); /* fail */
 452
 453 /*
 454  * 6 testcases:
 455  */
 456 #include "locking-selftest-spin.h"
 457 GENERATE_TESTCASE(ABCDBCDA_spin)
 458 #include "locking-selftest-wlock.h"
 459 GENERATE_TESTCASE(ABCDBCDA_wlock)
 460 #include "locking-selftest-rlock.h"
 461 GENERATE_TESTCASE(ABCDBCDA_rlock)
 462 #include "locking-selftest-mutex.h"
 463 GENERATE_TESTCASE(ABCDBCDA_mutex)
 464 #include "locking-selftest-wsem.h"
 465 GENERATE_TESTCASE(ABCDBCDA_wsem)
 466 #include "locking-selftest-rsem.h"
 467 GENERATE_TESTCASE(ABCDBCDA_rsem)
 468
 469 #undef E
 470
 471 /*
 472  * Double unlock:
 473  */
 474 #define E()                                     \
 475                                                 \
 476         LOCK(A);                                \
 477         UNLOCK(A);                              \
 478         UNLOCK(A); /* fail */
 479
 480 /*
 481  * 6 testcases:
 482  */
 483 #include "locking-selftest-spin.h"
 484 GENERATE_TESTCASE(double_unlock_spin)
 485 #include "locking-selftest-wlock.h"
 486 GENERATE_TESTCASE(double_unlock_wlock)
 487 #include "locking-selftest-rlock.h"
 488 GENERATE_TESTCASE(double_unlock_rlock)
 489 #include "locking-selftest-mutex.h"
 490 GENERATE_TESTCASE(double_unlock_mutex)
 491 #include "locking-selftest-wsem.h"
 492 GENERATE_TESTCASE(double_unlock_wsem)
 493 #include "locking-selftest-rsem.h"
 494 GENERATE_TESTCASE(double_unlock_rsem)
 495
 496 #undef E
 497
 498 /*
 499  * Bad unlock ordering:
 500  */
 501 #define E()                                     \
 502                                                 \
 503         LOCK(A);                                \
 504         LOCK(B);                                \
 505         UNLOCK(A); /* fail */                   \
 506         UNLOCK(B);
 507
 508 /*
 509  * 6 testcases:
 510  */
 511 #include "locking-selftest-spin.h"
 512 GENERATE_TESTCASE(bad_unlock_order_spin)
 513 #include "locking-selftest-wlock.h"
 514 GENERATE_TESTCASE(bad_unlock_order_wlock)
 515 #include "locking-selftest-rlock.h"
 516 GENERATE_TESTCASE(bad_unlock_order_rlock)
 517 #include "locking-selftest-mutex.h"
 518 GENERATE_TESTCASE(bad_unlock_order_mutex)
 519 #include "locking-selftest-wsem.h"
 520 GENERATE_TESTCASE(bad_unlock_order_wsem)
 521 #include "locking-selftest-rsem.h"
 522 GENERATE_TESTCASE(bad_unlock_order_rsem)
 523
 524 #undef E
 525
 526 /*
 527  * initializing a held lock:
 528  */
 529 #define E()                                     \
 530                                                 \
 531         LOCK(A);                                \
 532         INIT(A); /* fail */
 533
 534 /*
 535  * 6 testcases:
 536  */
 537 #include "locking-selftest-spin.h"
 538 GENERATE_TESTCASE(init_held_spin)
 539 #include "locking-selftest-wlock.h"
 540 GENERATE_TESTCASE(init_held_wlock)
 541 #include "locking-selftest-rlock.h"
 542 GENERATE_TESTCASE(init_held_rlock)
 543 #include "locking-selftest-mutex.h"
 544 GENERATE_TESTCASE(init_held_mutex)
 545 #include "locking-selftest-wsem.h"
 546 GENERATE_TESTCASE(init_held_wsem)
 547 #include "locking-selftest-rsem.h"
 548 GENERATE_TESTCASE(init_held_rsem)
 549
 550 #undef E
 551
 552 /*
 553  * locking an irq-safe lock with irqs enabled:
 554  */
 555 #define E1()                            \
 556                                         \
 557         IRQ_ENTER();                    \
 558         LOCK(A);                        \
 559         UNLOCK(A);                      \
 560         IRQ_EXIT();
 561
 562 #define E2()                            \
 563                                         \
 564         LOCK(A);                        \
 565         UNLOCK(A);
 566
 567 /*
 568  * Generate 24 testcases:
 569  */
 570 #include "locking-selftest-spin-hardirq.h"
 571 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin)
 572
 573 #include "locking-selftest-rlock-hardirq.h"
 574 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock)
 575
 576 #include "locking-selftest-wlock-hardirq.h"
 577 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_wlock)
 578
 579 #include "locking-selftest-spin-softirq.h"
 580 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_spin)
 581
 582 #include "locking-selftest-rlock-softirq.h"
 583 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_rlock)
 584
 585 #include "locking-selftest-wlock-softirq.h"
 586 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_wlock)
 587
 588 #undef E1
 589 #undef E2
 590
 591 /*
 592  * Enabling hardirqs with a softirq-safe lock held:
 593  */
 594 #define E1()                            \
 595                                         \
 596         SOFTIRQ_ENTER();                \
 597         LOCK(A);                        \
 598         UNLOCK(A);                      \
 599         SOFTIRQ_EXIT();
 600
 601 #define E2()                            \
 602                                         \
 603         HARDIRQ_DISABLE();              \
 604         LOCK(A);                        \
 605         HARDIRQ_ENABLE();               \
 606         UNLOCK(A);
 607
 608 /*
 609  * Generate 12 testcases:
 610  */
 611 #include "locking-selftest-spin.h"
 612 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_spin)
 613
 614 #include "locking-selftest-wlock.h"
 615 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_wlock)
 616
 617 #include "locking-selftest-rlock.h"
 618 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_rlock)
 619
 620 #undef E1
 621 #undef E2
 622
 623 /*
 624  * Enabling irqs with an irq-safe lock held:
 625  */
 626 #define E1()                            \
 627                                         \
 628         IRQ_ENTER();                    \
 629         LOCK(A);                        \
 630         UNLOCK(A);                      \
 631         IRQ_EXIT();
 632
 633 #define E2()                            \
 634                                         \
 635         IRQ_DISABLE();                  \
 636         LOCK(A);                        \
 637         IRQ_ENABLE();                   \
 638         UNLOCK(A);
 639
 640 /*
 641  * Generate 24 testcases:
 642  */
 643 #include "locking-selftest-spin-hardirq.h"
 644 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_spin)
 645
 646 #include "locking-selftest-rlock-hardirq.h"
 647 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_rlock)
 648
 649 #include "locking-selftest-wlock-hardirq.h"
 650 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_wlock)
 651
 652 #include "locking-selftest-spin-softirq.h"
 653 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_spin)
 654
 655 #include "locking-selftest-rlock-softirq.h"
 656 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_rlock)
 657
 658 #include "locking-selftest-wlock-softirq.h"
 659 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock)
 660
 661 #undef E1
 662 #undef E2
 663
 664 /*
 665  * Acquiring a irq-unsafe lock while holding an irq-safe-lock:
 666  */
 667 #define E1()                            \
 668                                         \
 669         LOCK(A);                        \
 670         LOCK(B);                        \
 671         UNLOCK(B);                      \
 672         UNLOCK(A);                      \
 673
 674 #define E2()                            \
 675                                         \
 676         LOCK(B);                        \
 677         UNLOCK(B);
 678
 679 #define E3()                            \
 680                                         \
 681         IRQ_ENTER();                    \
 682         LOCK(A);                        \
 683         UNLOCK(A);                      \
 684         IRQ_EXIT();
 685
 686 /*
 687  * Generate 36 testcases:
 688  */
 689 #include "locking-selftest-spin-hardirq.h"
 690 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_spin)
 691
 692 #include "locking-selftest-rlock-hardirq.h"
 693 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_rlock)
 694
 695 #include "locking-selftest-wlock-hardirq.h"
 696 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_wlock)
 697
 698 #include "locking-selftest-spin-softirq.h"
 699 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_spin)
 700
 701 #include "locking-selftest-rlock-softirq.h"
 702 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_rlock)
 703
 704 #include "locking-selftest-wlock-softirq.h"
 705 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock)
 706
 707 #undef E1
 708 #undef E2
 709 #undef E3
 710
 711 /*
 712  * If a lock turns into softirq-safe, but earlier it took
 713  * a softirq-unsafe lock:
 714  */
 715
 716 #define E1()                            \
 717         IRQ_DISABLE();                  \
 718         LOCK(A);                        \
 719         LOCK(B);                        \
 720         UNLOCK(B);                      \
 721         UNLOCK(A);                      \
 722         IRQ_ENABLE();
 723
 724 #define E2()                            \
 725         LOCK(B);                        \
 726         UNLOCK(B);
 727
 728 #define E3()                            \
 729         IRQ_ENTER();                    \
 730         LOCK(A);                        \
 731         UNLOCK(A);                      \
 732         IRQ_EXIT();
 733
 734 /*
 735  * Generate 36 testcases:
 736  */
 737 #include "locking-selftest-spin-hardirq.h"
 738 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_spin)
 739
 740 #include "locking-selftest-rlock-hardirq.h"
 741 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_rlock)
 742
 743 #include "locking-selftest-wlock-hardirq.h"
 744 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_wlock)
 745
 746 #include "locking-selftest-spin-softirq.h"
 747 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_spin)
 748
 749 #include "locking-selftest-rlock-softirq.h"
 750 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_rlock)
 751
 752 #include "locking-selftest-wlock-softirq.h"
 753 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_wlock)
 754
 755 #undef E1
 756 #undef E2
 757 #undef E3
 758
 759 /*
 760  * read-lock / write-lock irq inversion.
 761  *
 762  * Deadlock scenario:
 763  *
 764  * CPU#1 is at #1, i.e. it has write-locked A, but has not
 765  * taken B yet.
 766  *
 767  * CPU#2 is at #2, i.e. it has locked B.
 768  *
 769  * Hardirq hits CPU#2 at point #2 and is trying to read-lock A.
 770  *
 771  * The deadlock occurs because CPU#1 will spin on B, and CPU#2
 772  * will spin on A.
 773  */
 774
 775 #define E1()                            \
 776                                         \
 777         IRQ_DISABLE();                  \
 778         WL(A);                          \
 779         LOCK(B);                        \
 780         UNLOCK(B);                      \
 781         WU(A);                          \
 782         IRQ_ENABLE();
 783
 784 #define E2()                            \
 785                                         \
 786         LOCK(B);                        \
 787         UNLOCK(B);
 788
 789 #define E3()                            \
 790                                         \
 791         IRQ_ENTER();                    \
 792         RL(A);                          \
 793         RU(A);                          \
 794         IRQ_EXIT();
 795
 796 /*
 797  * Generate 36 testcases:
 798  */
 799 #include "locking-selftest-spin-hardirq.h"
 800 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_spin)
 801
 802 #include "locking-selftest-rlock-hardirq.h"
 803 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_rlock)
 804
 805 #include "locking-selftest-wlock-hardirq.h"
 806 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_wlock)
 807
 808 #include "locking-selftest-spin-softirq.h"
 809 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_spin)
 810
 811 #include "locking-selftest-rlock-softirq.h"
 812 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_rlock)
 813
 814 #include "locking-selftest-wlock-softirq.h"
 815 GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_wlock)
 816
 817 #undef E1
 818 #undef E2
 819 #undef E3
 820
 821 /*
 822  * read-lock / write-lock recursion that is actually safe.
 823  */
 824
 825 #define E1()                            \
 826                                         \
 827         IRQ_DISABLE();                  \
 828         WL(A);                          \
 829         WU(A);                          \
 830         IRQ_ENABLE();
 831
 832 #define E2()                            \
 833                                         \
 834         RL(A);                          \
 835         RU(A);                          \
 836
 837 #define E3()                            \
 838                                         \
 839         IRQ_ENTER();                    \
 840         RL(A);                          \
 841         L(B);                           \
 842         U(B);                           \
 843         RU(A);                          \
 844         IRQ_EXIT();
 845
 846 /*
 847  * Generate 12 testcases:
 848  */
 849 #include "locking-selftest-hardirq.h"
 850 GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard)
 851
 852 #include "locking-selftest-softirq.h"
 853 GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft)
 854
 855 #undef E1
 856 #undef E2
 857 #undef E3
 858
 859 /*
 860  * read-lock / write-lock recursion that is unsafe.
 861  */
 862
 863 #define E1()                            \
 864                                         \
 865         IRQ_DISABLE();                  \
 866         L(B);                           \
 867         WL(A);                          \
 868         WU(A);                          \
 869         U(B);                           \
 870         IRQ_ENABLE();
 871
 872 #define E2()                            \
 873                                         \
 874         RL(A);                          \
 875         RU(A);                          \
 876
 877 #define E3()                            \
 878                                         \
 879         IRQ_ENTER();                    \
 880         L(B);                           \
 881         U(B);                           \
 882         IRQ_EXIT();
 883
 884 /*
 885  * Generate 12 testcases:
 886  */
 887 #include "locking-selftest-hardirq.h"
 888 // GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard)
 889
 890 #include "locking-selftest-softirq.h"
 891 // GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft)
 892
 893 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 894 # define I_SPINLOCK(x)  lockdep_reset_lock(&lock_##x.dep_map)
 895 # define I_RWLOCK(x)    lockdep_reset_lock(&rwlock_##x.dep_map)
 896 # define I_MUTEX(x)     lockdep_reset_lock(&mutex_##x.dep_map)
 897 # define I_RWSEM(x)     lockdep_reset_lock(&rwsem_##x.dep_map)
 898 #else
 899 # define I_SPINLOCK(x)
 900 # define I_RWLOCK(x)
 901 # define I_MUTEX(x)
 902 # define I_RWSEM(x)
 903 #endif
 904
 905 #define I1(x)                                   \
 906         do {                                    \
 907                 I_SPINLOCK(x);                  \
 908                 I_RWLOCK(x);                    \
 909                 I_MUTEX(x);                     \
 910                 I_RWSEM(x);                     \
 911         } while (0)
 912
 913 #define I2(x)                                   \
 914         do {                                    \
 915                 spin_lock_init(&lock_##x);      \
 916                 rwlock_init(&rwlock_##x);       \
 917                 mutex_init(&mutex_##x);         \
 918                 init_rwsem(&rwsem_##x);         \
 919         } while (0)
 920
 921 static void reset_locks(void)
 922 {
 923         local_irq_disable();
 924         I1(A); I1(B); I1(C); I1(D);
 925         I1(X1); I1(X2); I1(Y1); I1(Y2); I1(Z1); I1(Z2);
 926         lockdep_reset();
 927         I2(A); I2(B); I2(C); I2(D);
 928         init_shared_classes();
 929         local_irq_enable();
 930 }
 931
 932 #undef I
 933
 934 static int testcase_total;
 935 static int testcase_successes;
 936 static int expected_testcase_failures;
 937 static int unexpected_testcase_failures;
 938
 939 static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask)
 940 {
 941         unsigned long saved_preempt_count = preempt_count();
 942         int expected_failure = 0;
 943
 944         WARN_ON(irqs_disabled());
 945
 946         testcase_fn();
 947         /*
 948          * Filter out expected failures:
 949          */
 950 #ifndef CONFIG_PROVE_LOCKING
 951         if ((lockclass_mask & LOCKTYPE_SPIN) && debug_locks != expected)
 952                 expected_failure = 1;
 953         if ((lockclass_mask & LOCKTYPE_RWLOCK) && debug_locks != expected)
 954                 expected_failure = 1;
 955         if ((lockclass_mask & LOCKTYPE_MUTEX) && debug_locks != expected)
 956                 expected_failure = 1;
 957         if ((lockclass_mask & LOCKTYPE_RWSEM) && debug_locks != expected)
 958                 expected_failure = 1;
 959 #endif
 960         if (debug_locks != expected) {
 961                 if (expected_failure) {
 962                         expected_testcase_failures++;
 963                         printk("failed|");
 964                 } else {
 965                         unexpected_testcase_failures++;
 966
 967                         printk("FAILED|");
 968                         dump_stack();
 969                 }
 970         } else {
 971                 testcase_successes++;
 972                 printk("  ok  |");
 973         }
 974         testcase_total++;
 975
 976         if (debug_locks_verbose)
 977                 printk(" lockclass mask: %x, debug_locks: %d, expected: %d\n",
 978                         lockclass_mask, debug_locks, expected);
 979         /*
 980          * Some tests (e.g. double-unlock) might corrupt the preemption
 981          * count, so restore it:
 982          */
 983         preempt_count() = saved_preempt_count;
 984 #ifdef CONFIG_TRACE_IRQFLAGS
 985         if (softirq_count())
 986                 current->softirqs_enabled = 0;
 987         else
 988                 current->softirqs_enabled = 1;
 989 #endif
 990
 991         reset_locks();
 992 }
 993
 994 static inline void print_testname(const char *testname)
 995 {
 996         printk("%33s:", testname);
 997 }
 998
 999 #define DO_TESTCASE_1(desc, name, nr)                           \
1000         print_testname(desc"/"#nr);                             \
1001         dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK);          \
1002         printk("\n");
1003
1004 #define DO_TESTCASE_1B(desc, name, nr)                          \
1005         print_testname(desc"/"#nr);                             \
1006         dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK);          \
1007         printk("\n");
1008
1009 #define DO_TESTCASE_3(desc, name, nr)                           \
1010         print_testname(desc"/"#nr);                             \
1011         dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN);       \
1012         dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK);    \
1013         dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK);    \
1014         printk("\n");
1015
1016 #define DO_TESTCASE_3RW(desc, name, nr)                         \
1017         print_testname(desc"/"#nr);                             \
1018         dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN|LOCKTYPE_RWLOCK);\
1019         dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK);    \
1020         dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK);    \
1021         printk("\n");
1022
1023 #define DO_TESTCASE_6(desc, name)                               \
1024         print_testname(desc);                                   \
1025         dotest(name##_spin, FAILURE, LOCKTYPE_SPIN);            \
1026         dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK);         \
1027         dotest(name##_rlock, FAILURE, LOCKTYPE_RWLOCK);         \
1028         dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX);          \
1029         dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM);           \
1030         dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM);           \
1031         printk("\n");
1032
1033 #define DO_TESTCASE_6_SUCCESS(desc, name)                       \
1034         print_testname(desc);                                   \
1035         dotest(name##_spin, SUCCESS, LOCKTYPE_SPIN);            \
1036         dotest(name##_wlock, SUCCESS, LOCKTYPE_RWLOCK);         \
1037         dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK);         \
1038         dotest(name##_mutex, SUCCESS, LOCKTYPE_MUTEX);          \
1039         dotest(name##_wsem, SUCCESS, LOCKTYPE_RWSEM);           \
1040         dotest(name##_rsem, SUCCESS, LOCKTYPE_RWSEM);           \
1041         printk("\n");
1042
1043 /*
1044  * 'read' variant: rlocks must not trigger.
1045  */
1046 #define DO_TESTCASE_6R(desc, name)                              \
1047         print_testname(desc);                                   \
1048         dotest(name##_spin, FAILURE, LOCKTYPE_SPIN);            \
1049         dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK);         \
1050         dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK);         \
1051         dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX);          \
1052         dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM);           \
1053         dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM);           \
1054         printk("\n");
1055
1056 #define DO_TESTCASE_2I(desc, name, nr)                          \
1057         DO_TESTCASE_1("hard-"desc, name##_hard, nr);            \
1058         DO_TESTCASE_1("soft-"desc, name##_soft, nr);
1059
1060 #define DO_TESTCASE_2IB(desc, name, nr)                         \
1061         DO_TESTCASE_1B("hard-"desc, name##_hard, nr);           \
1062         DO_TESTCASE_1B("soft-"desc, name##_soft, nr);
1063
1064 #define DO_TESTCASE_6I(desc, name, nr)                          \
1065         DO_TESTCASE_3("hard-"desc, name##_hard, nr);            \
1066         DO_TESTCASE_3("soft-"desc, name##_soft, nr);
1067
1068 #define DO_TESTCASE_6IRW(desc, name, nr)                        \
1069         DO_TESTCASE_3RW("hard-"desc, name##_hard, nr);          \
1070         DO_TESTCASE_3RW("soft-"desc, name##_soft, nr);
1071
1072 #define DO_TESTCASE_2x3(desc, name)                             \
1073         DO_TESTCASE_3(desc, name, 12);                          \
1074         DO_TESTCASE_3(desc, name, 21);
1075
1076 #define DO_TESTCASE_2x6(desc, name)                             \
1077         DO_TESTCASE_6I(desc, name, 12);                         \
1078         DO_TESTCASE_6I(desc, name, 21);
1079
1080 #define DO_TESTCASE_6x2(desc, name)                             \
1081         DO_TESTCASE_2I(desc, name, 123);                        \
1082         DO_TESTCASE_2I(desc, name, 132);                        \
1083         DO_TESTCASE_2I(desc, name, 213);                        \
1084         DO_TESTCASE_2I(desc, name, 231);                        \
1085         DO_TESTCASE_2I(desc, name, 312);                        \
1086         DO_TESTCASE_2I(desc, name, 321);
1087
1088 #define DO_TESTCASE_6x2B(desc, name)                            \
1089         DO_TESTCASE_2IB(desc, name, 123);                       \
1090         DO_TESTCASE_2IB(desc, name, 132);                       \
1091         DO_TESTCASE_2IB(desc, name, 213);                       \
1092         DO_TESTCASE_2IB(desc, name, 231);                       \
1093         DO_TESTCASE_2IB(desc, name, 312);                       \
1094         DO_TESTCASE_2IB(desc, name, 321);
1095
1096 #define DO_TESTCASE_6x6(desc, name)                             \
1097         DO_TESTCASE_6I(desc, name, 123);                        \
1098         DO_TESTCASE_6I(desc, name, 132);                        \
1099         DO_TESTCASE_6I(desc, name, 213);                        \
1100         DO_TESTCASE_6I(desc, name, 231);                        \
1101         DO_TESTCASE_6I(desc, name, 312);                        \
1102         DO_TESTCASE_6I(desc, name, 321);
1103
1104 #define DO_TESTCASE_6x6RW(desc, name)                           \
1105         DO_TESTCASE_6IRW(desc, name, 123);                      \
1106         DO_TESTCASE_6IRW(desc, name, 132);                      \
1107         DO_TESTCASE_6IRW(desc, name, 213);                      \
1108         DO_TESTCASE_6IRW(desc, name, 231);                      \
1109         DO_TESTCASE_6IRW(desc, name, 312);                      \
1110         DO_TESTCASE_6IRW(desc, name, 321);
1111
1112
1113 void locking_selftest(void)
1114 {
1115         /*
1116          * Got a locking failure before the selftest ran?
1117          */
1118         if (!debug_locks) {
1119                 printk("----------------------------------\n");
1120                 printk("| Locking API testsuite disabled |\n");
1121                 printk("----------------------------------\n");
1122                 return;
1123         }
1124
1125         /*
1126          * Run the testsuite:
1127          */
1128         printk("------------------------\n");
1129         printk("| Locking API testsuite:\n");
1130         printk("----------------------------------------------------------------------------\n");
1131         printk("                                 | spin |wlock |rlock |mutex | wsem | rsem |\n");
1132         printk("  --------------------------------------------------------------------------\n");
1133
1134         init_shared_classes();
1135         debug_locks_silent = !debug_locks_verbose;
1136
1137         DO_TESTCASE_6R("A-A deadlock", AA);
1138         DO_TESTCASE_6R("A-B-B-A deadlock", ABBA);
1139         DO_TESTCASE_6R("A-B-B-C-C-A deadlock", ABBCCA);
1140         DO_TESTCASE_6R("A-B-C-A-B-C deadlock", ABCABC);
1141         DO_TESTCASE_6R("A-B-B-C-C-D-D-A deadlock", ABBCCDDA);
1142         DO_TESTCASE_6R("A-B-C-D-B-D-D-A deadlock", ABCDBDDA);
1143         DO_TESTCASE_6R("A-B-C-D-B-C-D-A deadlock", ABCDBCDA);
1144         DO_TESTCASE_6("double unlock", double_unlock);
1145         DO_TESTCASE_6("initialize held", init_held);
1146         DO_TESTCASE_6_SUCCESS("bad unlock order", bad_unlock_order);
1147
1148         printk("  --------------------------------------------------------------------------\n");
1149         print_testname("recursive read-lock");
1150         printk("             |");
1151         dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK);
1152         printk("             |");
1153         dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM);
1154         printk("\n");
1155
1156         print_testname("recursive read-lock #2");
1157         printk("             |");
1158         dotest(rlock_AA1B, SUCCESS, LOCKTYPE_RWLOCK);
1159         printk("             |");
1160         dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM);
1161         printk("\n");
1162
1163         print_testname("mixed read-write-lock");
1164         printk("             |");
1165         dotest(rlock_AA2, FAILURE, LOCKTYPE_RWLOCK);
1166         printk("             |");
1167         dotest(rsem_AA2, FAILURE, LOCKTYPE_RWSEM);
1168         printk("\n");
1169
1170         print_testname("mixed write-read-lock");
1171         printk("             |");
1172         dotest(rlock_AA3, FAILURE, LOCKTYPE_RWLOCK);
1173         printk("             |");
1174         dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM);
1175         printk("\n");
1176
1177         printk("  --------------------------------------------------------------------------\n");
1178
1179         /*
1180          * irq-context testcases:
1181          */
1182         DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1);
1183         DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A);
1184         DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B);
1185         DO_TESTCASE_6x6("safe-A + unsafe-B #1", irqsafe3);
1186         DO_TESTCASE_6x6("safe-A + unsafe-B #2", irqsafe4);
1187         DO_TESTCASE_6x6RW("irq lock-inversion", irq_inversion);
1188
1189         DO_TESTCASE_6x2("irq read-recursion", irq_read_recursion);
1190 //      DO_TESTCASE_6x2B("irq read-recursion #2", irq_read_recursion2);
1191
1192         if (unexpected_testcase_failures) {
1193                 printk("-----------------------------------------------------------------\n");
1194                 debug_locks = 0;
1195                 printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n",
1196                         unexpected_testcase_failures, testcase_total);
1197                 printk("-----------------------------------------------------------------\n");
1198         } else if (expected_testcase_failures && testcase_successes) {
1199                 printk("--------------------------------------------------------\n");
1200                 printk("%3d out of %3d testcases failed, as expected. |\n",
1201                         expected_testcase_failures, testcase_total);
1202                 printk("----------------------------------------------------\n");
1203                 debug_locks = 1;
1204         } else if (expected_testcase_failures && !testcase_successes) {
1205                 printk("--------------------------------------------------------\n");
1206                 printk("All %3d testcases failed, as expected. |\n",
1207                         expected_testcase_failures);
1208                 printk("----------------------------------------\n");
1209                 debug_locks = 1;
1210         } else {
1211                 printk("-------------------------------------------------------\n");
1212                 printk("Good, all %3d testcases passed! |\n",
1213                         testcase_successes);
1214                 printk("---------------------------------\n");
1215                 debug_locks = 1;
1216         }
1217         debug_locks_silent = 0;
1218 }