1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Base unit test (KUnit) API. 4 * 5 * Copyright (C) 2019, Google LLC. 6 * Author: Brendan Higgins <brendanhiggins@google.com> 7 */ 8 9 #include <kunit/resource.h> 10 #include <kunit/test.h> 11 #include <kunit/test-bug.h> 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/moduleparam.h> 15 #include <linux/panic.h> 16 #include <linux/sched/debug.h> 17 #include <linux/sched.h> 18 19 #include "debugfs.h" 20 #include "string-stream.h" 21 #include "try-catch-impl.h" 22 23 DEFINE_STATIC_KEY_FALSE(kunit_running); 24 25 #if IS_BUILTIN(CONFIG_KUNIT) 26 /* 27 * Fail the current test and print an error message to the log. 28 */ 29 void __kunit_fail_current_test(const char *file, int line, const char *fmt, ...) 30 { 31 va_list args; 32 int len; 33 char *buffer; 34 35 if (!current->kunit_test) 36 return; 37 38 kunit_set_failure(current->kunit_test); 39 40 /* kunit_err() only accepts literals, so evaluate the args first. */ 41 va_start(args, fmt); 42 len = vsnprintf(NULL, 0, fmt, args) + 1; 43 va_end(args); 44 45 buffer = kunit_kmalloc(current->kunit_test, len, GFP_KERNEL); 46 if (!buffer) 47 return; 48 49 va_start(args, fmt); 50 vsnprintf(buffer, len, fmt, args); 51 va_end(args); 52 53 kunit_err(current->kunit_test, "%s:%d: %s", file, line, buffer); 54 kunit_kfree(current->kunit_test, buffer); 55 } 56 EXPORT_SYMBOL_GPL(__kunit_fail_current_test); 57 #endif 58 59 /* 60 * Enable KUnit tests to run. 61 */ 62 #ifdef CONFIG_KUNIT_DEFAULT_ENABLED 63 static bool enable_param = true; 64 #else 65 static bool enable_param; 66 #endif 67 module_param_named(enable, enable_param, bool, 0); 68 MODULE_PARM_DESC(enable, "Enable KUnit tests"); 69 70 /* 71 * KUnit statistic mode: 72 * 0 - disabled 73 * 1 - only when there is more than one subtest 74 * 2 - enabled 75 */ 76 static int kunit_stats_enabled = 1; 77 module_param_named(stats_enabled, kunit_stats_enabled, int, 0644); 78 MODULE_PARM_DESC(stats_enabled, 79 "Print test stats: never (0), only for multiple subtests (1), or always (2)"); 80 81 struct kunit_result_stats { 82 unsigned long passed; 83 unsigned long skipped; 84 unsigned long failed; 85 unsigned long total; 86 }; 87 88 static bool kunit_should_print_stats(struct kunit_result_stats stats) 89 { 90 if (kunit_stats_enabled == 0) 91 return false; 92 93 if (kunit_stats_enabled == 2) 94 return true; 95 96 return (stats.total > 1); 97 } 98 99 static void kunit_print_test_stats(struct kunit *test, 100 struct kunit_result_stats stats) 101 { 102 if (!kunit_should_print_stats(stats)) 103 return; 104 105 kunit_log(KERN_INFO, test, 106 KUNIT_SUBTEST_INDENT 107 "# %s: pass:%lu fail:%lu skip:%lu total:%lu", 108 test->name, 109 stats.passed, 110 stats.failed, 111 stats.skipped, 112 stats.total); 113 } 114 115 /* 116 * Append formatted message to log, size of which is limited to 117 * KUNIT_LOG_SIZE bytes (including null terminating byte). 118 */ 119 void kunit_log_append(char *log, const char *fmt, ...) 120 { 121 char line[KUNIT_LOG_SIZE]; 122 va_list args; 123 int len_left; 124 125 if (!log) 126 return; 127 128 len_left = KUNIT_LOG_SIZE - strlen(log) - 1; 129 if (len_left <= 0) 130 return; 131 132 va_start(args, fmt); 133 vsnprintf(line, sizeof(line), fmt, args); 134 va_end(args); 135 136 strncat(log, line, len_left); 137 } 138 EXPORT_SYMBOL_GPL(kunit_log_append); 139 140 size_t kunit_suite_num_test_cases(struct kunit_suite *suite) 141 { 142 struct kunit_case *test_case; 143 size_t len = 0; 144 145 kunit_suite_for_each_test_case(suite, test_case) 146 len++; 147 148 return len; 149 } 150 EXPORT_SYMBOL_GPL(kunit_suite_num_test_cases); 151 152 static void kunit_print_suite_start(struct kunit_suite *suite) 153 { 154 kunit_log(KERN_INFO, suite, KUNIT_SUBTEST_INDENT "# Subtest: %s", 155 suite->name); 156 kunit_log(KERN_INFO, suite, KUNIT_SUBTEST_INDENT "1..%zd", 157 kunit_suite_num_test_cases(suite)); 158 } 159 160 static void kunit_print_ok_not_ok(void *test_or_suite, 161 bool is_test, 162 enum kunit_status status, 163 size_t test_number, 164 const char *description, 165 const char *directive) 166 { 167 struct kunit_suite *suite = is_test ? NULL : test_or_suite; 168 struct kunit *test = is_test ? test_or_suite : NULL; 169 const char *directive_header = (status == KUNIT_SKIPPED) ? " # SKIP " : ""; 170 171 /* 172 * We do not log the test suite results as doing so would 173 * mean debugfs display would consist of the test suite 174 * description and status prior to individual test results. 175 * Hence directly printk the suite status, and we will 176 * separately seq_printf() the suite status for the debugfs 177 * representation. 178 */ 179 if (suite) 180 pr_info("%s %zd - %s%s%s\n", 181 kunit_status_to_ok_not_ok(status), 182 test_number, description, directive_header, 183 (status == KUNIT_SKIPPED) ? directive : ""); 184 else 185 kunit_log(KERN_INFO, test, 186 KUNIT_SUBTEST_INDENT "%s %zd - %s%s%s", 187 kunit_status_to_ok_not_ok(status), 188 test_number, description, directive_header, 189 (status == KUNIT_SKIPPED) ? directive : ""); 190 } 191 192 enum kunit_status kunit_suite_has_succeeded(struct kunit_suite *suite) 193 { 194 const struct kunit_case *test_case; 195 enum kunit_status status = KUNIT_SKIPPED; 196 197 if (suite->suite_init_err) 198 return KUNIT_FAILURE; 199 200 kunit_suite_for_each_test_case(suite, test_case) { 201 if (test_case->status == KUNIT_FAILURE) 202 return KUNIT_FAILURE; 203 else if (test_case->status == KUNIT_SUCCESS) 204 status = KUNIT_SUCCESS; 205 } 206 207 return status; 208 } 209 EXPORT_SYMBOL_GPL(kunit_suite_has_succeeded); 210 211 static size_t kunit_suite_counter = 1; 212 213 static void kunit_print_suite_end(struct kunit_suite *suite) 214 { 215 kunit_print_ok_not_ok((void *)suite, false, 216 kunit_suite_has_succeeded(suite), 217 kunit_suite_counter++, 218 suite->name, 219 suite->status_comment); 220 } 221 222 unsigned int kunit_test_case_num(struct kunit_suite *suite, 223 struct kunit_case *test_case) 224 { 225 struct kunit_case *tc; 226 unsigned int i = 1; 227 228 kunit_suite_for_each_test_case(suite, tc) { 229 if (tc == test_case) 230 return i; 231 i++; 232 } 233 234 return 0; 235 } 236 EXPORT_SYMBOL_GPL(kunit_test_case_num); 237 238 static void kunit_print_string_stream(struct kunit *test, 239 struct string_stream *stream) 240 { 241 struct string_stream_fragment *fragment; 242 char *buf; 243 244 if (string_stream_is_empty(stream)) 245 return; 246 247 buf = string_stream_get_string(stream); 248 if (!buf) { 249 kunit_err(test, 250 "Could not allocate buffer, dumping stream:\n"); 251 list_for_each_entry(fragment, &stream->fragments, node) { 252 kunit_err(test, "%s", fragment->fragment); 253 } 254 kunit_err(test, "\n"); 255 } else { 256 kunit_err(test, "%s", buf); 257 kunit_kfree(test, buf); 258 } 259 } 260 261 static void kunit_fail(struct kunit *test, const struct kunit_loc *loc, 262 enum kunit_assert_type type, const struct kunit_assert *assert, 263 assert_format_t assert_format, const struct va_format *message) 264 { 265 struct string_stream *stream; 266 267 kunit_set_failure(test); 268 269 stream = alloc_string_stream(test, GFP_KERNEL); 270 if (!stream) { 271 WARN(true, 272 "Could not allocate stream to print failed assertion in %s:%d\n", 273 loc->file, 274 loc->line); 275 return; 276 } 277 278 kunit_assert_prologue(loc, type, stream); 279 assert_format(assert, message, stream); 280 281 kunit_print_string_stream(test, stream); 282 283 string_stream_destroy(stream); 284 } 285 286 static void __noreturn kunit_abort(struct kunit *test) 287 { 288 kunit_try_catch_throw(&test->try_catch); /* Does not return. */ 289 290 /* 291 * Throw could not abort from test. 292 * 293 * XXX: we should never reach this line! As kunit_try_catch_throw is 294 * marked __noreturn. 295 */ 296 WARN_ONCE(true, "Throw could not abort from test!\n"); 297 } 298 299 void kunit_do_failed_assertion(struct kunit *test, 300 const struct kunit_loc *loc, 301 enum kunit_assert_type type, 302 const struct kunit_assert *assert, 303 assert_format_t assert_format, 304 const char *fmt, ...) 305 { 306 va_list args; 307 struct va_format message; 308 va_start(args, fmt); 309 310 message.fmt = fmt; 311 message.va = &args; 312 313 kunit_fail(test, loc, type, assert, assert_format, &message); 314 315 va_end(args); 316 317 if (type == KUNIT_ASSERTION) 318 kunit_abort(test); 319 } 320 EXPORT_SYMBOL_GPL(kunit_do_failed_assertion); 321 322 void kunit_init_test(struct kunit *test, const char *name, char *log) 323 { 324 spin_lock_init(&test->lock); 325 INIT_LIST_HEAD(&test->resources); 326 test->name = name; 327 test->log = log; 328 if (test->log) 329 test->log[0] = '\0'; 330 test->status = KUNIT_SUCCESS; 331 test->status_comment[0] = '\0'; 332 } 333 EXPORT_SYMBOL_GPL(kunit_init_test); 334 335 /* 336 * Initializes and runs test case. Does not clean up or do post validations. 337 */ 338 static void kunit_run_case_internal(struct kunit *test, 339 struct kunit_suite *suite, 340 struct kunit_case *test_case) 341 { 342 if (suite->init) { 343 int ret; 344 345 ret = suite->init(test); 346 if (ret) { 347 kunit_err(test, "failed to initialize: %d\n", ret); 348 kunit_set_failure(test); 349 return; 350 } 351 } 352 353 test_case->run_case(test); 354 } 355 356 static void kunit_case_internal_cleanup(struct kunit *test) 357 { 358 kunit_cleanup(test); 359 } 360 361 /* 362 * Performs post validations and cleanup after a test case was run. 363 * XXX: Should ONLY BE CALLED AFTER kunit_run_case_internal! 364 */ 365 static void kunit_run_case_cleanup(struct kunit *test, 366 struct kunit_suite *suite) 367 { 368 if (suite->exit) 369 suite->exit(test); 370 371 kunit_case_internal_cleanup(test); 372 } 373 374 struct kunit_try_catch_context { 375 struct kunit *test; 376 struct kunit_suite *suite; 377 struct kunit_case *test_case; 378 }; 379 380 static void kunit_try_run_case(void *data) 381 { 382 struct kunit_try_catch_context *ctx = data; 383 struct kunit *test = ctx->test; 384 struct kunit_suite *suite = ctx->suite; 385 struct kunit_case *test_case = ctx->test_case; 386 387 current->kunit_test = test; 388 389 /* 390 * kunit_run_case_internal may encounter a fatal error; if it does, 391 * abort will be called, this thread will exit, and finally the parent 392 * thread will resume control and handle any necessary clean up. 393 */ 394 kunit_run_case_internal(test, suite, test_case); 395 /* This line may never be reached. */ 396 kunit_run_case_cleanup(test, suite); 397 } 398 399 static void kunit_catch_run_case(void *data) 400 { 401 struct kunit_try_catch_context *ctx = data; 402 struct kunit *test = ctx->test; 403 struct kunit_suite *suite = ctx->suite; 404 int try_exit_code = kunit_try_catch_get_result(&test->try_catch); 405 406 if (try_exit_code) { 407 kunit_set_failure(test); 408 /* 409 * Test case could not finish, we have no idea what state it is 410 * in, so don't do clean up. 411 */ 412 if (try_exit_code == -ETIMEDOUT) { 413 kunit_err(test, "test case timed out\n"); 414 /* 415 * Unknown internal error occurred preventing test case from 416 * running, so there is nothing to clean up. 417 */ 418 } else { 419 kunit_err(test, "internal error occurred preventing test case from running: %d\n", 420 try_exit_code); 421 } 422 return; 423 } 424 425 /* 426 * Test case was run, but aborted. It is the test case's business as to 427 * whether it failed or not, we just need to clean up. 428 */ 429 kunit_run_case_cleanup(test, suite); 430 } 431 432 /* 433 * Performs all logic to run a test case. It also catches most errors that 434 * occur in a test case and reports them as failures. 435 */ 436 static void kunit_run_case_catch_errors(struct kunit_suite *suite, 437 struct kunit_case *test_case, 438 struct kunit *test) 439 { 440 struct kunit_try_catch_context context; 441 struct kunit_try_catch *try_catch; 442 443 kunit_init_test(test, test_case->name, test_case->log); 444 try_catch = &test->try_catch; 445 446 kunit_try_catch_init(try_catch, 447 test, 448 kunit_try_run_case, 449 kunit_catch_run_case); 450 context.test = test; 451 context.suite = suite; 452 context.test_case = test_case; 453 kunit_try_catch_run(try_catch, &context); 454 455 /* Propagate the parameter result to the test case. */ 456 if (test->status == KUNIT_FAILURE) 457 test_case->status = KUNIT_FAILURE; 458 else if (test_case->status != KUNIT_FAILURE && test->status == KUNIT_SUCCESS) 459 test_case->status = KUNIT_SUCCESS; 460 } 461 462 static void kunit_print_suite_stats(struct kunit_suite *suite, 463 struct kunit_result_stats suite_stats, 464 struct kunit_result_stats param_stats) 465 { 466 if (kunit_should_print_stats(suite_stats)) { 467 kunit_log(KERN_INFO, suite, 468 "# %s: pass:%lu fail:%lu skip:%lu total:%lu", 469 suite->name, 470 suite_stats.passed, 471 suite_stats.failed, 472 suite_stats.skipped, 473 suite_stats.total); 474 } 475 476 if (kunit_should_print_stats(param_stats)) { 477 kunit_log(KERN_INFO, suite, 478 "# Totals: pass:%lu fail:%lu skip:%lu total:%lu", 479 param_stats.passed, 480 param_stats.failed, 481 param_stats.skipped, 482 param_stats.total); 483 } 484 } 485 486 static void kunit_update_stats(struct kunit_result_stats *stats, 487 enum kunit_status status) 488 { 489 switch (status) { 490 case KUNIT_SUCCESS: 491 stats->passed++; 492 break; 493 case KUNIT_SKIPPED: 494 stats->skipped++; 495 break; 496 case KUNIT_FAILURE: 497 stats->failed++; 498 break; 499 } 500 501 stats->total++; 502 } 503 504 static void kunit_accumulate_stats(struct kunit_result_stats *total, 505 struct kunit_result_stats add) 506 { 507 total->passed += add.passed; 508 total->skipped += add.skipped; 509 total->failed += add.failed; 510 total->total += add.total; 511 } 512 513 int kunit_run_tests(struct kunit_suite *suite) 514 { 515 char param_desc[KUNIT_PARAM_DESC_SIZE]; 516 struct kunit_case *test_case; 517 struct kunit_result_stats suite_stats = { 0 }; 518 struct kunit_result_stats total_stats = { 0 }; 519 520 /* Taint the kernel so we know we've run tests. */ 521 add_taint(TAINT_TEST, LOCKDEP_STILL_OK); 522 523 if (suite->suite_init) { 524 suite->suite_init_err = suite->suite_init(suite); 525 if (suite->suite_init_err) { 526 kunit_err(suite, KUNIT_SUBTEST_INDENT 527 "# failed to initialize (%d)", suite->suite_init_err); 528 goto suite_end; 529 } 530 } 531 532 kunit_print_suite_start(suite); 533 534 kunit_suite_for_each_test_case(suite, test_case) { 535 struct kunit test = { .param_value = NULL, .param_index = 0 }; 536 struct kunit_result_stats param_stats = { 0 }; 537 test_case->status = KUNIT_SKIPPED; 538 539 if (!test_case->generate_params) { 540 /* Non-parameterised test. */ 541 kunit_run_case_catch_errors(suite, test_case, &test); 542 kunit_update_stats(¶m_stats, test.status); 543 } else { 544 /* Get initial param. */ 545 param_desc[0] = '\0'; 546 test.param_value = test_case->generate_params(NULL, param_desc); 547 kunit_log(KERN_INFO, &test, KUNIT_SUBTEST_INDENT KUNIT_SUBTEST_INDENT 548 "# Subtest: %s", test_case->name); 549 550 while (test.param_value) { 551 kunit_run_case_catch_errors(suite, test_case, &test); 552 553 if (param_desc[0] == '\0') { 554 snprintf(param_desc, sizeof(param_desc), 555 "param-%d", test.param_index); 556 } 557 558 kunit_log(KERN_INFO, &test, 559 KUNIT_SUBTEST_INDENT KUNIT_SUBTEST_INDENT 560 "%s %d - %s", 561 kunit_status_to_ok_not_ok(test.status), 562 test.param_index + 1, param_desc); 563 564 /* Get next param. */ 565 param_desc[0] = '\0'; 566 test.param_value = test_case->generate_params(test.param_value, param_desc); 567 test.param_index++; 568 569 kunit_update_stats(¶m_stats, test.status); 570 } 571 } 572 573 574 kunit_print_test_stats(&test, param_stats); 575 576 kunit_print_ok_not_ok(&test, true, test_case->status, 577 kunit_test_case_num(suite, test_case), 578 test_case->name, 579 test.status_comment); 580 581 kunit_update_stats(&suite_stats, test_case->status); 582 kunit_accumulate_stats(&total_stats, param_stats); 583 } 584 585 if (suite->suite_exit) 586 suite->suite_exit(suite); 587 588 kunit_print_suite_stats(suite, suite_stats, total_stats); 589 suite_end: 590 kunit_print_suite_end(suite); 591 592 return 0; 593 } 594 EXPORT_SYMBOL_GPL(kunit_run_tests); 595 596 static void kunit_init_suite(struct kunit_suite *suite) 597 { 598 kunit_debugfs_create_suite(suite); 599 suite->status_comment[0] = '\0'; 600 suite->suite_init_err = 0; 601 } 602 603 bool kunit_enabled(void) 604 { 605 return enable_param; 606 } 607 608 int __kunit_test_suites_init(struct kunit_suite * const * const suites, int num_suites) 609 { 610 unsigned int i; 611 612 if (!kunit_enabled() && num_suites > 0) { 613 pr_info("kunit: disabled\n"); 614 return 0; 615 } 616 617 static_branch_inc(&kunit_running); 618 619 for (i = 0; i < num_suites; i++) { 620 kunit_init_suite(suites[i]); 621 kunit_run_tests(suites[i]); 622 } 623 624 static_branch_dec(&kunit_running); 625 return 0; 626 } 627 EXPORT_SYMBOL_GPL(__kunit_test_suites_init); 628 629 static void kunit_exit_suite(struct kunit_suite *suite) 630 { 631 kunit_debugfs_destroy_suite(suite); 632 } 633 634 void __kunit_test_suites_exit(struct kunit_suite **suites, int num_suites) 635 { 636 unsigned int i; 637 638 if (!kunit_enabled()) 639 return; 640 641 for (i = 0; i < num_suites; i++) 642 kunit_exit_suite(suites[i]); 643 644 kunit_suite_counter = 1; 645 } 646 EXPORT_SYMBOL_GPL(__kunit_test_suites_exit); 647 648 #ifdef CONFIG_MODULES 649 static void kunit_module_init(struct module *mod) 650 { 651 __kunit_test_suites_init(mod->kunit_suites, mod->num_kunit_suites); 652 } 653 654 static void kunit_module_exit(struct module *mod) 655 { 656 __kunit_test_suites_exit(mod->kunit_suites, mod->num_kunit_suites); 657 } 658 659 static int kunit_module_notify(struct notifier_block *nb, unsigned long val, 660 void *data) 661 { 662 struct module *mod = data; 663 664 switch (val) { 665 case MODULE_STATE_LIVE: 666 kunit_module_init(mod); 667 break; 668 case MODULE_STATE_GOING: 669 kunit_module_exit(mod); 670 break; 671 case MODULE_STATE_COMING: 672 case MODULE_STATE_UNFORMED: 673 break; 674 } 675 676 return 0; 677 } 678 679 static struct notifier_block kunit_mod_nb = { 680 .notifier_call = kunit_module_notify, 681 .priority = 0, 682 }; 683 #endif 684 685 struct kunit_kmalloc_array_params { 686 size_t n; 687 size_t size; 688 gfp_t gfp; 689 }; 690 691 static int kunit_kmalloc_array_init(struct kunit_resource *res, void *context) 692 { 693 struct kunit_kmalloc_array_params *params = context; 694 695 res->data = kmalloc_array(params->n, params->size, params->gfp); 696 if (!res->data) 697 return -ENOMEM; 698 699 return 0; 700 } 701 702 static void kunit_kmalloc_array_free(struct kunit_resource *res) 703 { 704 kfree(res->data); 705 } 706 707 void *kunit_kmalloc_array(struct kunit *test, size_t n, size_t size, gfp_t gfp) 708 { 709 struct kunit_kmalloc_array_params params = { 710 .size = size, 711 .n = n, 712 .gfp = gfp 713 }; 714 715 return kunit_alloc_resource(test, 716 kunit_kmalloc_array_init, 717 kunit_kmalloc_array_free, 718 gfp, 719 ¶ms); 720 } 721 EXPORT_SYMBOL_GPL(kunit_kmalloc_array); 722 723 static inline bool kunit_kfree_match(struct kunit *test, 724 struct kunit_resource *res, void *match_data) 725 { 726 /* Only match resources allocated with kunit_kmalloc() and friends. */ 727 return res->free == kunit_kmalloc_array_free && res->data == match_data; 728 } 729 730 void kunit_kfree(struct kunit *test, const void *ptr) 731 { 732 if (!ptr) 733 return; 734 735 if (kunit_destroy_resource(test, kunit_kfree_match, (void *)ptr)) 736 KUNIT_FAIL(test, "kunit_kfree: %px already freed or not allocated by kunit", ptr); 737 } 738 EXPORT_SYMBOL_GPL(kunit_kfree); 739 740 void kunit_cleanup(struct kunit *test) 741 { 742 struct kunit_resource *res; 743 unsigned long flags; 744 745 /* 746 * test->resources is a stack - each allocation must be freed in the 747 * reverse order from which it was added since one resource may depend 748 * on another for its entire lifetime. 749 * Also, we cannot use the normal list_for_each constructs, even the 750 * safe ones because *arbitrary* nodes may be deleted when 751 * kunit_resource_free is called; the list_for_each_safe variants only 752 * protect against the current node being deleted, not the next. 753 */ 754 while (true) { 755 spin_lock_irqsave(&test->lock, flags); 756 if (list_empty(&test->resources)) { 757 spin_unlock_irqrestore(&test->lock, flags); 758 break; 759 } 760 res = list_last_entry(&test->resources, 761 struct kunit_resource, 762 node); 763 /* 764 * Need to unlock here as a resource may remove another 765 * resource, and this can't happen if the test->lock 766 * is held. 767 */ 768 spin_unlock_irqrestore(&test->lock, flags); 769 kunit_remove_resource(test, res); 770 } 771 current->kunit_test = NULL; 772 } 773 EXPORT_SYMBOL_GPL(kunit_cleanup); 774 775 static int __init kunit_init(void) 776 { 777 kunit_debugfs_init(); 778 #ifdef CONFIG_MODULES 779 return register_module_notifier(&kunit_mod_nb); 780 #else 781 return 0; 782 #endif 783 } 784 late_initcall(kunit_init); 785 786 static void __exit kunit_exit(void) 787 { 788 #ifdef CONFIG_MODULES 789 unregister_module_notifier(&kunit_mod_nb); 790 #endif 791 kunit_debugfs_cleanup(); 792 } 793 module_exit(kunit_exit); 794 795 MODULE_LICENSE("GPL v2"); 796