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/test.h> 10 #include <kunit/test-bug.h> 11 #include <linux/kernel.h> 12 #include <linux/kref.h> 13 #include <linux/moduleparam.h> 14 #include <linux/sched/debug.h> 15 #include <linux/sched.h> 16 17 #include "debugfs.h" 18 #include "string-stream.h" 19 #include "try-catch-impl.h" 20 21 #if IS_BUILTIN(CONFIG_KUNIT) 22 /* 23 * Fail the current test and print an error message to the log. 24 */ 25 void __kunit_fail_current_test(const char *file, int line, const char *fmt, ...) 26 { 27 va_list args; 28 int len; 29 char *buffer; 30 31 if (!current->kunit_test) 32 return; 33 34 kunit_set_failure(current->kunit_test); 35 36 /* kunit_err() only accepts literals, so evaluate the args first. */ 37 va_start(args, fmt); 38 len = vsnprintf(NULL, 0, fmt, args) + 1; 39 va_end(args); 40 41 buffer = kunit_kmalloc(current->kunit_test, len, GFP_KERNEL); 42 if (!buffer) 43 return; 44 45 va_start(args, fmt); 46 vsnprintf(buffer, len, fmt, args); 47 va_end(args); 48 49 kunit_err(current->kunit_test, "%s:%d: %s", file, line, buffer); 50 kunit_kfree(current->kunit_test, buffer); 51 } 52 EXPORT_SYMBOL_GPL(__kunit_fail_current_test); 53 #endif 54 55 /* 56 * KUnit statistic mode: 57 * 0 - disabled 58 * 1 - only when there is more than one subtest 59 * 2 - enabled 60 */ 61 static int kunit_stats_enabled = 1; 62 module_param_named(stats_enabled, kunit_stats_enabled, int, 0644); 63 MODULE_PARM_DESC(stats_enabled, 64 "Print test stats: never (0), only for multiple subtests (1), or always (2)"); 65 66 struct kunit_result_stats { 67 unsigned long passed; 68 unsigned long skipped; 69 unsigned long failed; 70 unsigned long total; 71 }; 72 73 static bool kunit_should_print_stats(struct kunit_result_stats stats) 74 { 75 if (kunit_stats_enabled == 0) 76 return false; 77 78 if (kunit_stats_enabled == 2) 79 return true; 80 81 return (stats.total > 1); 82 } 83 84 static void kunit_print_test_stats(struct kunit *test, 85 struct kunit_result_stats stats) 86 { 87 if (!kunit_should_print_stats(stats)) 88 return; 89 90 kunit_log(KERN_INFO, test, 91 KUNIT_SUBTEST_INDENT 92 "# %s: pass:%lu fail:%lu skip:%lu total:%lu", 93 test->name, 94 stats.passed, 95 stats.failed, 96 stats.skipped, 97 stats.total); 98 } 99 100 /* 101 * Append formatted message to log, size of which is limited to 102 * KUNIT_LOG_SIZE bytes (including null terminating byte). 103 */ 104 void kunit_log_append(char *log, const char *fmt, ...) 105 { 106 char line[KUNIT_LOG_SIZE]; 107 va_list args; 108 int len_left; 109 110 if (!log) 111 return; 112 113 len_left = KUNIT_LOG_SIZE - strlen(log) - 1; 114 if (len_left <= 0) 115 return; 116 117 va_start(args, fmt); 118 vsnprintf(line, sizeof(line), fmt, args); 119 va_end(args); 120 121 strncat(log, line, len_left); 122 } 123 EXPORT_SYMBOL_GPL(kunit_log_append); 124 125 size_t kunit_suite_num_test_cases(struct kunit_suite *suite) 126 { 127 struct kunit_case *test_case; 128 size_t len = 0; 129 130 kunit_suite_for_each_test_case(suite, test_case) 131 len++; 132 133 return len; 134 } 135 EXPORT_SYMBOL_GPL(kunit_suite_num_test_cases); 136 137 static void kunit_print_subtest_start(struct kunit_suite *suite) 138 { 139 kunit_log(KERN_INFO, suite, KUNIT_SUBTEST_INDENT "# Subtest: %s", 140 suite->name); 141 kunit_log(KERN_INFO, suite, KUNIT_SUBTEST_INDENT "1..%zd", 142 kunit_suite_num_test_cases(suite)); 143 } 144 145 static void kunit_print_ok_not_ok(void *test_or_suite, 146 bool is_test, 147 enum kunit_status status, 148 size_t test_number, 149 const char *description, 150 const char *directive) 151 { 152 struct kunit_suite *suite = is_test ? NULL : test_or_suite; 153 struct kunit *test = is_test ? test_or_suite : NULL; 154 const char *directive_header = (status == KUNIT_SKIPPED) ? " # SKIP " : ""; 155 156 /* 157 * We do not log the test suite results as doing so would 158 * mean debugfs display would consist of the test suite 159 * description and status prior to individual test results. 160 * Hence directly printk the suite status, and we will 161 * separately seq_printf() the suite status for the debugfs 162 * representation. 163 */ 164 if (suite) 165 pr_info("%s %zd - %s%s%s\n", 166 kunit_status_to_ok_not_ok(status), 167 test_number, description, directive_header, 168 (status == KUNIT_SKIPPED) ? directive : ""); 169 else 170 kunit_log(KERN_INFO, test, 171 KUNIT_SUBTEST_INDENT "%s %zd - %s%s%s", 172 kunit_status_to_ok_not_ok(status), 173 test_number, description, directive_header, 174 (status == KUNIT_SKIPPED) ? directive : ""); 175 } 176 177 enum kunit_status kunit_suite_has_succeeded(struct kunit_suite *suite) 178 { 179 const struct kunit_case *test_case; 180 enum kunit_status status = KUNIT_SKIPPED; 181 182 kunit_suite_for_each_test_case(suite, test_case) { 183 if (test_case->status == KUNIT_FAILURE) 184 return KUNIT_FAILURE; 185 else if (test_case->status == KUNIT_SUCCESS) 186 status = KUNIT_SUCCESS; 187 } 188 189 return status; 190 } 191 EXPORT_SYMBOL_GPL(kunit_suite_has_succeeded); 192 193 static size_t kunit_suite_counter = 1; 194 195 static void kunit_print_subtest_end(struct kunit_suite *suite) 196 { 197 kunit_print_ok_not_ok((void *)suite, false, 198 kunit_suite_has_succeeded(suite), 199 kunit_suite_counter++, 200 suite->name, 201 suite->status_comment); 202 } 203 204 unsigned int kunit_test_case_num(struct kunit_suite *suite, 205 struct kunit_case *test_case) 206 { 207 struct kunit_case *tc; 208 unsigned int i = 1; 209 210 kunit_suite_for_each_test_case(suite, tc) { 211 if (tc == test_case) 212 return i; 213 i++; 214 } 215 216 return 0; 217 } 218 EXPORT_SYMBOL_GPL(kunit_test_case_num); 219 220 static void kunit_print_string_stream(struct kunit *test, 221 struct string_stream *stream) 222 { 223 struct string_stream_fragment *fragment; 224 char *buf; 225 226 if (string_stream_is_empty(stream)) 227 return; 228 229 buf = string_stream_get_string(stream); 230 if (!buf) { 231 kunit_err(test, 232 "Could not allocate buffer, dumping stream:\n"); 233 list_for_each_entry(fragment, &stream->fragments, node) { 234 kunit_err(test, "%s", fragment->fragment); 235 } 236 kunit_err(test, "\n"); 237 } else { 238 kunit_err(test, "%s", buf); 239 kunit_kfree(test, buf); 240 } 241 } 242 243 static void kunit_fail(struct kunit *test, struct kunit_assert *assert) 244 { 245 struct string_stream *stream; 246 247 kunit_set_failure(test); 248 249 stream = alloc_string_stream(test, GFP_KERNEL); 250 if (!stream) { 251 WARN(true, 252 "Could not allocate stream to print failed assertion in %s:%d\n", 253 assert->file, 254 assert->line); 255 return; 256 } 257 258 assert->format(assert, stream); 259 260 kunit_print_string_stream(test, stream); 261 262 WARN_ON(string_stream_destroy(stream)); 263 } 264 265 static void __noreturn kunit_abort(struct kunit *test) 266 { 267 kunit_try_catch_throw(&test->try_catch); /* Does not return. */ 268 269 /* 270 * Throw could not abort from test. 271 * 272 * XXX: we should never reach this line! As kunit_try_catch_throw is 273 * marked __noreturn. 274 */ 275 WARN_ONCE(true, "Throw could not abort from test!\n"); 276 } 277 278 void kunit_do_assertion(struct kunit *test, 279 struct kunit_assert *assert, 280 bool pass, 281 const char *fmt, ...) 282 { 283 va_list args; 284 285 if (pass) 286 return; 287 288 va_start(args, fmt); 289 290 assert->message.fmt = fmt; 291 assert->message.va = &args; 292 293 kunit_fail(test, assert); 294 295 va_end(args); 296 297 if (assert->type == KUNIT_ASSERTION) 298 kunit_abort(test); 299 } 300 EXPORT_SYMBOL_GPL(kunit_do_assertion); 301 302 void kunit_init_test(struct kunit *test, const char *name, char *log) 303 { 304 spin_lock_init(&test->lock); 305 INIT_LIST_HEAD(&test->resources); 306 test->name = name; 307 test->log = log; 308 if (test->log) 309 test->log[0] = '\0'; 310 test->status = KUNIT_SUCCESS; 311 test->status_comment[0] = '\0'; 312 } 313 EXPORT_SYMBOL_GPL(kunit_init_test); 314 315 /* 316 * Initializes and runs test case. Does not clean up or do post validations. 317 */ 318 static void kunit_run_case_internal(struct kunit *test, 319 struct kunit_suite *suite, 320 struct kunit_case *test_case) 321 { 322 if (suite->init) { 323 int ret; 324 325 ret = suite->init(test); 326 if (ret) { 327 kunit_err(test, "failed to initialize: %d\n", ret); 328 kunit_set_failure(test); 329 return; 330 } 331 } 332 333 test_case->run_case(test); 334 } 335 336 static void kunit_case_internal_cleanup(struct kunit *test) 337 { 338 kunit_cleanup(test); 339 } 340 341 /* 342 * Performs post validations and cleanup after a test case was run. 343 * XXX: Should ONLY BE CALLED AFTER kunit_run_case_internal! 344 */ 345 static void kunit_run_case_cleanup(struct kunit *test, 346 struct kunit_suite *suite) 347 { 348 if (suite->exit) 349 suite->exit(test); 350 351 kunit_case_internal_cleanup(test); 352 } 353 354 struct kunit_try_catch_context { 355 struct kunit *test; 356 struct kunit_suite *suite; 357 struct kunit_case *test_case; 358 }; 359 360 static void kunit_try_run_case(void *data) 361 { 362 struct kunit_try_catch_context *ctx = data; 363 struct kunit *test = ctx->test; 364 struct kunit_suite *suite = ctx->suite; 365 struct kunit_case *test_case = ctx->test_case; 366 367 current->kunit_test = test; 368 369 /* 370 * kunit_run_case_internal may encounter a fatal error; if it does, 371 * abort will be called, this thread will exit, and finally the parent 372 * thread will resume control and handle any necessary clean up. 373 */ 374 kunit_run_case_internal(test, suite, test_case); 375 /* This line may never be reached. */ 376 kunit_run_case_cleanup(test, suite); 377 } 378 379 static void kunit_catch_run_case(void *data) 380 { 381 struct kunit_try_catch_context *ctx = data; 382 struct kunit *test = ctx->test; 383 struct kunit_suite *suite = ctx->suite; 384 int try_exit_code = kunit_try_catch_get_result(&test->try_catch); 385 386 if (try_exit_code) { 387 kunit_set_failure(test); 388 /* 389 * Test case could not finish, we have no idea what state it is 390 * in, so don't do clean up. 391 */ 392 if (try_exit_code == -ETIMEDOUT) { 393 kunit_err(test, "test case timed out\n"); 394 /* 395 * Unknown internal error occurred preventing test case from 396 * running, so there is nothing to clean up. 397 */ 398 } else { 399 kunit_err(test, "internal error occurred preventing test case from running: %d\n", 400 try_exit_code); 401 } 402 return; 403 } 404 405 /* 406 * Test case was run, but aborted. It is the test case's business as to 407 * whether it failed or not, we just need to clean up. 408 */ 409 kunit_run_case_cleanup(test, suite); 410 } 411 412 /* 413 * Performs all logic to run a test case. It also catches most errors that 414 * occur in a test case and reports them as failures. 415 */ 416 static void kunit_run_case_catch_errors(struct kunit_suite *suite, 417 struct kunit_case *test_case, 418 struct kunit *test) 419 { 420 struct kunit_try_catch_context context; 421 struct kunit_try_catch *try_catch; 422 423 kunit_init_test(test, test_case->name, test_case->log); 424 try_catch = &test->try_catch; 425 426 kunit_try_catch_init(try_catch, 427 test, 428 kunit_try_run_case, 429 kunit_catch_run_case); 430 context.test = test; 431 context.suite = suite; 432 context.test_case = test_case; 433 kunit_try_catch_run(try_catch, &context); 434 435 /* Propagate the parameter result to the test case. */ 436 if (test->status == KUNIT_FAILURE) 437 test_case->status = KUNIT_FAILURE; 438 else if (test_case->status != KUNIT_FAILURE && test->status == KUNIT_SUCCESS) 439 test_case->status = KUNIT_SUCCESS; 440 } 441 442 static void kunit_print_suite_stats(struct kunit_suite *suite, 443 struct kunit_result_stats suite_stats, 444 struct kunit_result_stats param_stats) 445 { 446 if (kunit_should_print_stats(suite_stats)) { 447 kunit_log(KERN_INFO, suite, 448 "# %s: pass:%lu fail:%lu skip:%lu total:%lu", 449 suite->name, 450 suite_stats.passed, 451 suite_stats.failed, 452 suite_stats.skipped, 453 suite_stats.total); 454 } 455 456 if (kunit_should_print_stats(param_stats)) { 457 kunit_log(KERN_INFO, suite, 458 "# Totals: pass:%lu fail:%lu skip:%lu total:%lu", 459 param_stats.passed, 460 param_stats.failed, 461 param_stats.skipped, 462 param_stats.total); 463 } 464 } 465 466 static void kunit_update_stats(struct kunit_result_stats *stats, 467 enum kunit_status status) 468 { 469 switch (status) { 470 case KUNIT_SUCCESS: 471 stats->passed++; 472 break; 473 case KUNIT_SKIPPED: 474 stats->skipped++; 475 break; 476 case KUNIT_FAILURE: 477 stats->failed++; 478 break; 479 } 480 481 stats->total++; 482 } 483 484 static void kunit_accumulate_stats(struct kunit_result_stats *total, 485 struct kunit_result_stats add) 486 { 487 total->passed += add.passed; 488 total->skipped += add.skipped; 489 total->failed += add.failed; 490 total->total += add.total; 491 } 492 493 int kunit_run_tests(struct kunit_suite *suite) 494 { 495 char param_desc[KUNIT_PARAM_DESC_SIZE]; 496 struct kunit_case *test_case; 497 struct kunit_result_stats suite_stats = { 0 }; 498 struct kunit_result_stats total_stats = { 0 }; 499 500 kunit_print_subtest_start(suite); 501 502 kunit_suite_for_each_test_case(suite, test_case) { 503 struct kunit test = { .param_value = NULL, .param_index = 0 }; 504 struct kunit_result_stats param_stats = { 0 }; 505 test_case->status = KUNIT_SKIPPED; 506 507 if (!test_case->generate_params) { 508 /* Non-parameterised test. */ 509 kunit_run_case_catch_errors(suite, test_case, &test); 510 kunit_update_stats(¶m_stats, test.status); 511 } else { 512 /* Get initial param. */ 513 param_desc[0] = '\0'; 514 test.param_value = test_case->generate_params(NULL, param_desc); 515 kunit_log(KERN_INFO, &test, KUNIT_SUBTEST_INDENT KUNIT_SUBTEST_INDENT 516 "# Subtest: %s", test_case->name); 517 518 while (test.param_value) { 519 kunit_run_case_catch_errors(suite, test_case, &test); 520 521 if (param_desc[0] == '\0') { 522 snprintf(param_desc, sizeof(param_desc), 523 "param-%d", test.param_index); 524 } 525 526 kunit_log(KERN_INFO, &test, 527 KUNIT_SUBTEST_INDENT KUNIT_SUBTEST_INDENT 528 "%s %d - %s", 529 kunit_status_to_ok_not_ok(test.status), 530 test.param_index + 1, param_desc); 531 532 /* Get next param. */ 533 param_desc[0] = '\0'; 534 test.param_value = test_case->generate_params(test.param_value, param_desc); 535 test.param_index++; 536 537 kunit_update_stats(¶m_stats, test.status); 538 } 539 } 540 541 542 kunit_print_test_stats(&test, param_stats); 543 544 kunit_print_ok_not_ok(&test, true, test_case->status, 545 kunit_test_case_num(suite, test_case), 546 test_case->name, 547 test.status_comment); 548 549 kunit_update_stats(&suite_stats, test_case->status); 550 kunit_accumulate_stats(&total_stats, param_stats); 551 } 552 553 kunit_print_suite_stats(suite, suite_stats, total_stats); 554 kunit_print_subtest_end(suite); 555 556 return 0; 557 } 558 EXPORT_SYMBOL_GPL(kunit_run_tests); 559 560 static void kunit_init_suite(struct kunit_suite *suite) 561 { 562 kunit_debugfs_create_suite(suite); 563 suite->status_comment[0] = '\0'; 564 } 565 566 int __kunit_test_suites_init(struct kunit_suite * const * const suites) 567 { 568 unsigned int i; 569 570 for (i = 0; suites[i] != NULL; i++) { 571 kunit_init_suite(suites[i]); 572 kunit_run_tests(suites[i]); 573 } 574 return 0; 575 } 576 EXPORT_SYMBOL_GPL(__kunit_test_suites_init); 577 578 static void kunit_exit_suite(struct kunit_suite *suite) 579 { 580 kunit_debugfs_destroy_suite(suite); 581 } 582 583 void __kunit_test_suites_exit(struct kunit_suite **suites) 584 { 585 unsigned int i; 586 587 for (i = 0; suites[i] != NULL; i++) 588 kunit_exit_suite(suites[i]); 589 590 kunit_suite_counter = 1; 591 } 592 EXPORT_SYMBOL_GPL(__kunit_test_suites_exit); 593 594 /* 595 * Used for static resources and when a kunit_resource * has been created by 596 * kunit_alloc_resource(). When an init function is supplied, @data is passed 597 * into the init function; otherwise, we simply set the resource data field to 598 * the data value passed in. 599 */ 600 int kunit_add_resource(struct kunit *test, 601 kunit_resource_init_t init, 602 kunit_resource_free_t free, 603 struct kunit_resource *res, 604 void *data) 605 { 606 int ret = 0; 607 unsigned long flags; 608 609 res->free = free; 610 kref_init(&res->refcount); 611 612 if (init) { 613 ret = init(res, data); 614 if (ret) 615 return ret; 616 } else { 617 res->data = data; 618 } 619 620 spin_lock_irqsave(&test->lock, flags); 621 list_add_tail(&res->node, &test->resources); 622 /* refcount for list is established by kref_init() */ 623 spin_unlock_irqrestore(&test->lock, flags); 624 625 return ret; 626 } 627 EXPORT_SYMBOL_GPL(kunit_add_resource); 628 629 int kunit_add_named_resource(struct kunit *test, 630 kunit_resource_init_t init, 631 kunit_resource_free_t free, 632 struct kunit_resource *res, 633 const char *name, 634 void *data) 635 { 636 struct kunit_resource *existing; 637 638 if (!name) 639 return -EINVAL; 640 641 existing = kunit_find_named_resource(test, name); 642 if (existing) { 643 kunit_put_resource(existing); 644 return -EEXIST; 645 } 646 647 res->name = name; 648 649 return kunit_add_resource(test, init, free, res, data); 650 } 651 EXPORT_SYMBOL_GPL(kunit_add_named_resource); 652 653 struct kunit_resource *kunit_alloc_and_get_resource(struct kunit *test, 654 kunit_resource_init_t init, 655 kunit_resource_free_t free, 656 gfp_t internal_gfp, 657 void *data) 658 { 659 struct kunit_resource *res; 660 int ret; 661 662 res = kzalloc(sizeof(*res), internal_gfp); 663 if (!res) 664 return NULL; 665 666 ret = kunit_add_resource(test, init, free, res, data); 667 if (!ret) { 668 /* 669 * bump refcount for get; kunit_resource_put() should be called 670 * when done. 671 */ 672 kunit_get_resource(res); 673 return res; 674 } 675 return NULL; 676 } 677 EXPORT_SYMBOL_GPL(kunit_alloc_and_get_resource); 678 679 void kunit_remove_resource(struct kunit *test, struct kunit_resource *res) 680 { 681 unsigned long flags; 682 683 spin_lock_irqsave(&test->lock, flags); 684 list_del(&res->node); 685 spin_unlock_irqrestore(&test->lock, flags); 686 kunit_put_resource(res); 687 } 688 EXPORT_SYMBOL_GPL(kunit_remove_resource); 689 690 int kunit_destroy_resource(struct kunit *test, kunit_resource_match_t match, 691 void *match_data) 692 { 693 struct kunit_resource *res = kunit_find_resource(test, match, 694 match_data); 695 696 if (!res) 697 return -ENOENT; 698 699 kunit_remove_resource(test, res); 700 701 /* We have a reference also via _find(); drop it. */ 702 kunit_put_resource(res); 703 704 return 0; 705 } 706 EXPORT_SYMBOL_GPL(kunit_destroy_resource); 707 708 struct kunit_kmalloc_array_params { 709 size_t n; 710 size_t size; 711 gfp_t gfp; 712 }; 713 714 static int kunit_kmalloc_array_init(struct kunit_resource *res, void *context) 715 { 716 struct kunit_kmalloc_array_params *params = context; 717 718 res->data = kmalloc_array(params->n, params->size, params->gfp); 719 if (!res->data) 720 return -ENOMEM; 721 722 return 0; 723 } 724 725 static void kunit_kmalloc_array_free(struct kunit_resource *res) 726 { 727 kfree(res->data); 728 } 729 730 void *kunit_kmalloc_array(struct kunit *test, size_t n, size_t size, gfp_t gfp) 731 { 732 struct kunit_kmalloc_array_params params = { 733 .size = size, 734 .n = n, 735 .gfp = gfp 736 }; 737 738 return kunit_alloc_resource(test, 739 kunit_kmalloc_array_init, 740 kunit_kmalloc_array_free, 741 gfp, 742 ¶ms); 743 } 744 EXPORT_SYMBOL_GPL(kunit_kmalloc_array); 745 746 void kunit_kfree(struct kunit *test, const void *ptr) 747 { 748 struct kunit_resource *res; 749 750 res = kunit_find_resource(test, kunit_resource_instance_match, 751 (void *)ptr); 752 753 /* 754 * Removing the resource from the list of resources drops the 755 * reference count to 1; the final put will trigger the free. 756 */ 757 kunit_remove_resource(test, res); 758 759 kunit_put_resource(res); 760 761 } 762 EXPORT_SYMBOL_GPL(kunit_kfree); 763 764 void kunit_cleanup(struct kunit *test) 765 { 766 struct kunit_resource *res; 767 unsigned long flags; 768 769 /* 770 * test->resources is a stack - each allocation must be freed in the 771 * reverse order from which it was added since one resource may depend 772 * on another for its entire lifetime. 773 * Also, we cannot use the normal list_for_each constructs, even the 774 * safe ones because *arbitrary* nodes may be deleted when 775 * kunit_resource_free is called; the list_for_each_safe variants only 776 * protect against the current node being deleted, not the next. 777 */ 778 while (true) { 779 spin_lock_irqsave(&test->lock, flags); 780 if (list_empty(&test->resources)) { 781 spin_unlock_irqrestore(&test->lock, flags); 782 break; 783 } 784 res = list_last_entry(&test->resources, 785 struct kunit_resource, 786 node); 787 /* 788 * Need to unlock here as a resource may remove another 789 * resource, and this can't happen if the test->lock 790 * is held. 791 */ 792 spin_unlock_irqrestore(&test->lock, flags); 793 kunit_remove_resource(test, res); 794 } 795 current->kunit_test = NULL; 796 } 797 EXPORT_SYMBOL_GPL(kunit_cleanup); 798 799 static int __init kunit_init(void) 800 { 801 kunit_debugfs_init(); 802 803 return 0; 804 } 805 late_initcall(kunit_init); 806 807 static void __exit kunit_exit(void) 808 { 809 kunit_debugfs_cleanup(); 810 } 811 module_exit(kunit_exit); 812 813 MODULE_LICENSE("GPL v2"); 814