// SPDX-License-Identifier: GPL-2.0
/*
* Base unit test (KUnit) API.
*
* Copyright (C) 2019, Google LLC.
* Author: Brendan Higgins <[email protected]>
*/
#include <kunit/resource.h>
#include <kunit/test.h>
#include <kunit/test-bug.h>
#include <kunit/attributes.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/mutex.h>
#include <linux/panic.h>
#include <linux/sched/debug.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include "debugfs.h"
#include "device-impl.h"
#include "hooks-impl.h"
#include "string-stream.h"
#include "try-catch-impl.h"
static DEFINE_MUTEX(kunit_run_lock);
/*
* Hook to fail the current test and print an error message to the log.
*/
void __printf(3, 4) __kunit_fail_current_test_impl(const char *file, int line, const char *fmt, ...)
{
va_list args;
int len;
char *buffer;
if (!current->kunit_test)
return;
kunit_set_failure(current->kunit_test);
/* kunit_err() only accepts literals, so evaluate the args first. */
va_start(args, fmt);
len = vsnprintf(NULL, 0, fmt, args) + 1;
va_end(args);
buffer = kunit_kmalloc(current->kunit_test, len, GFP_KERNEL);
if (!buffer)
return;
va_start(args, fmt);
vsnprintf(buffer, len, fmt, args);
va_end(args);
kunit_err(current->kunit_test, "%s:%d: %s", file, line, buffer);
kunit_kfree(current->kunit_test, buffer);
}
/*
* Enable KUnit tests to run.
*/
#ifdef CONFIG_KUNIT_DEFAULT_ENABLED
static bool enable_param = true;
#else
static bool enable_param;
#endif
module_param_named(enable, enable_param, bool, 0);
MODULE_PARM_DESC(enable, "Enable KUnit tests");
/*
* KUnit statistic mode:
* 0 - disabled
* 1 - only when there is more than one subtest
* 2 - enabled
*/
static int kunit_stats_enabled = 1;
module_param_named(stats_enabled, kunit_stats_enabled, int, 0644);
MODULE_PARM_DESC(stats_enabled,
"Print test stats: never (0), only for multiple subtests (1), or always (2)");
struct kunit_result_stats {
unsigned long passed;
unsigned long skipped;
unsigned long failed;
unsigned long total;
};
static bool kunit_should_print_stats(struct kunit_result_stats stats)
{
if (kunit_stats_enabled == 0)
return false;
if (kunit_stats_enabled == 2)
return true;
return (stats.total > 1);
}
static void kunit_print_test_stats(struct kunit *test,
struct kunit_result_stats stats)
{
if (!kunit_should_print_stats(stats))
return;
kunit_log(KERN_INFO, test,
KUNIT_SUBTEST_INDENT
"# %s: pass:%lu fail:%lu skip:%lu total:%lu",
test->name,
stats.passed,
stats.failed,
stats.skipped,
stats.total);
}
/* Append formatted message to log. */
void kunit_log_append(struct string_stream *log, const char *fmt, ...)
{
va_list args;
if (!log)
return;
va_start(args, fmt);
string_stream_vadd(log, fmt, args);
va_end(args);
}
EXPORT_SYMBOL_GPL(kunit_log_append);
size_t kunit_suite_num_test_cases(struct kunit_suite *suite)
{
struct kunit_case *test_case;
size_t len = 0;
kunit_suite_for_each_test_case(suite, test_case)
len++;
return len;
}
EXPORT_SYMBOL_GPL(kunit_suite_num_test_cases);
/* Currently supported test levels */
enum {
KUNIT_LEVEL_SUITE = 0,
KUNIT_LEVEL_CASE,
KUNIT_LEVEL_CASE_PARAM,
};
static void kunit_print_suite_start(struct kunit_suite *suite)
{
/*
* We do not log the test suite header as doing so would
* mean debugfs display would consist of the test suite
* header prior to individual test results.
* Hence directly printk the suite status, and we will
* separately seq_printf() the suite header for the debugfs
* representation.
*/
pr_info(KUNIT_SUBTEST_INDENT "KTAP version 1\n");
pr_info(KUNIT_SUBTEST_INDENT "# Subtest: %s\n",
suite->name);
kunit_print_attr((void *)suite, false, KUNIT_LEVEL_CASE);
pr_info(KUNIT_SUBTEST_INDENT "1..%zd\n",
kunit_suite_num_test_cases(suite));
}
static void kunit_print_ok_not_ok(struct kunit *test,
unsigned int test_level,
enum kunit_status status,
size_t test_number,
const char *description,
const char *directive)
{
const char *directive_header = (status == KUNIT_SKIPPED) ? " # SKIP " : "";
const char *directive_body = (status == KUNIT_SKIPPED) ? directive : "";
/*
* When test is NULL assume that results are from the suite
* and today suite results are expected at level 0 only.
*/
WARN(!test && test_level, "suite test level can't be %u!\n", test_level);
/*
* We do not log the test suite results as doing so would
* mean debugfs display would consist of an incorrect test
* number. Hence directly printk the suite result, and we will
* separately seq_printf() the suite results for the debugfs
* representation.
*/
if (!test)
pr_info("%s %zd %s%s%s\n",
kunit_status_to_ok_not_ok(status),
test_number, description, directive_header,
directive_body);
else
kunit_log(KERN_INFO, test,
"%*s%s %zd %s%s%s",
KUNIT_INDENT_LEN * test_level, "",
kunit_status_to_ok_not_ok(status),
test_number, description, directive_header,
directive_body);
}
enum kunit_status kunit_suite_has_succeeded(struct kunit_suite *suite)
{
const struct kunit_case *test_case;
enum kunit_status status = KUNIT_SKIPPED;
if (suite->suite_init_err)
return KUNIT_FAILURE;
kunit_suite_for_each_test_case(suite, test_case) {
if (test_case->status == KUNIT_FAILURE)
return KUNIT_FAILURE;
else if (test_case->status == KUNIT_SUCCESS)
status = KUNIT_SUCCESS;
}
return status;
}
EXPORT_SYMBOL_GPL(kunit_suite_has_succeeded);
static size_t kunit_suite_counter = 1;
static void kunit_print_suite_end(struct kunit_suite *suite)
{
kunit_print_ok_not_ok(NULL, KUNIT_LEVEL_SUITE,
kunit_suite_has_succeeded(suite),
kunit_suite_counter++,
suite->name,
suite->status_comment);
}
unsigned int kunit_test_case_num(struct kunit_suite *suite,
struct kunit_case *test_case)
{
struct kunit_case *tc;
unsigned int i = 1;
kunit_suite_for_each_test_case(suite, tc) {
if (tc == test_case)
return i;
i++;
}
return 0;
}
EXPORT_SYMBOL_GPL(kunit_test_case_num);
static void kunit_print_string_stream(struct kunit *test,
struct string_stream *stream)
{
struct string_stream_fragment *fragment;
char *buf;
if (string_stream_is_empty(stream))
return;
buf = string_stream_get_string(stream);
if (!buf) {
kunit_err(test,
"Could not allocate buffer, dumping stream:\n");
list_for_each_entry(fragment, &stream->fragments, node) {
kunit_err(test, "%s", fragment->fragment);
}
kunit_err(test, "\n");
} else {
kunit_err(test, "%s", buf);
kfree(buf);
}
}
static void kunit_fail(struct kunit *test, const struct kunit_loc *loc,
enum kunit_assert_type type, const struct kunit_assert *assert,
assert_format_t assert_format, const struct va_format *message)
{
struct string_stream *stream;
kunit_set_failure(test);
stream = kunit_alloc_string_stream(test, GFP_KERNEL);
if (IS_ERR(stream)) {
WARN(true,
"Could not allocate stream to print failed assertion in %s:%d\n",
loc->file,
loc->line);
return;
}
kunit_assert_prologue(loc, type, stream);
assert_format(assert, message, stream);
kunit_print_string_stream(test, stream);
kunit_free_string_stream(test, stream);
}
void __noreturn __kunit_abort(struct kunit *test)
{
kunit_try_catch_throw(&test->try_catch); /* Does not return. */
/*
* Throw could not abort from test.
*
* XXX: we should never reach this line! As kunit_try_catch_throw is
* marked __noreturn.
*/
WARN_ONCE(true, "Throw could not abort from test!\n");
}
EXPORT_SYMBOL_GPL(__kunit_abort);
void __kunit_do_failed_assertion(struct kunit *test,
const struct kunit_loc *loc,
enum kunit_assert_type type,
const struct kunit_assert *assert,
assert_format_t assert_format,
const char *fmt, ...)
{
va_list args;
struct va_format message;
va_start(args, fmt);
message.fmt = fmt;
message.va = &args;
kunit_fail(test, loc, type, assert, assert_format, &message);
va_end(args);
}
EXPORT_SYMBOL_GPL(__kunit_do_failed_assertion);
void kunit_init_test(struct kunit *test, const char *name, struct string_stream *log)
{
spin_lock_init(&test->lock);
INIT_LIST_HEAD(&test->resources);
test->name = name;
test->log = log;
if (test->log)
string_stream_clear(log);
test->status = KUNIT_SUCCESS;
test->status_comment[0] = '\0';
}
EXPORT_SYMBOL_GPL(kunit_init_test);
/* Only warn when a test takes more than twice the threshold */
#define KUNIT_SPEED_WARNING_MULTIPLIER 2
/* Slow tests are defined as taking more than 1s */
#define KUNIT_SPEED_SLOW_THRESHOLD_S 1
#define KUNIT_SPEED_SLOW_WARNING_THRESHOLD_S \
(KUNIT_SPEED_WARNING_MULTIPLIER * KUNIT_SPEED_SLOW_THRESHOLD_S)
#define s_to_timespec64(s) ns_to_timespec64((s) * NSEC_PER_SEC)
static void kunit_run_case_check_speed(struct kunit *test,
struct kunit_case *test_case,
struct timespec64 duration)
{
struct timespec64 slow_thr =
s_to_timespec64(KUNIT_SPEED_SLOW_WARNING_THRESHOLD_S);
enum kunit_speed speed = test_case->attr.speed;
if (timespec64_compare(&duration, &slow_thr) < 0)
return;
if (speed == KUNIT_SPEED_VERY_SLOW || speed == KUNIT_SPEED_SLOW)
return;
kunit_warn(test,
"Test should be marked slow (runtime: %lld.%09lds)",
duration.tv_sec, duration.tv_nsec);
}
/*
* Initializes and runs test case. Does not clean up or do post validations.
*/
static void kunit_run_case_internal(struct kunit *test,
struct kunit_suite *suite,
struct kunit_case *test_case)
{
struct timespec64 start, end;
if (suite->init) {
int ret;
ret = suite->init(test);
if (ret) {
kunit_err(test, "failed to initialize: %d\n", ret);
kunit_set_failure(test);
return;
}
}
ktime_get_ts64(&start);
test_case->run_case(test);
ktime_get_ts64(&end);
kunit_run_case_check_speed(test, test_case, timespec64_sub(end, start));
}
static void kunit_case_internal_cleanup(struct kunit *test)
{
kunit_cleanup(test);
}
/*
* Performs post validations and cleanup after a test case was run.
* XXX: Should ONLY BE CALLED AFTER kunit_run_case_internal!
*/
static void kunit_run_case_cleanup(struct kunit *test,
struct kunit_suite *suite)
{
if (suite->exit)
suite->exit(test);
kunit_case_internal_cleanup(test);
}
struct kunit_try_catch_context {
struct kunit *test;
struct kunit_suite *suite;
struct kunit_case *test_case;
};
static void kunit_try_run_case(void *data)
{
struct kunit_try_catch_context *ctx = data;
struct kunit *test = ctx->test;
struct kunit_suite *suite = ctx->suite;
struct kunit_case *test_case = ctx->test_case;
current->kunit_test = test;
/*
* kunit_run_case_internal may encounter a fatal error; if it does,
* abort will be called, this thread will exit, and finally the parent
* thread will resume control and handle any necessary clean up.
*/
kunit_run_case_internal(test, suite, test_case);
}
static void kunit_try_run_case_cleanup(void *data)
{
struct kunit_try_catch_context *ctx = data;
struct kunit *test = ctx->test;
struct kunit_suite *suite = ctx->suite;
current->kunit_test = test;
kunit_run_case_cleanup(test, suite);
}
static void kunit_catch_run_case_cleanup(void *data)
{
struct kunit_try_catch_context *ctx = data;
struct kunit *test = ctx->test;
int try_exit_code = kunit_try_catch_get_result(&test->try_catch);
/* It is always a failure if cleanup aborts. */
kunit_set_failure(test);
if (try_exit_code) {
/*
* Test case could not finish, we have no idea what state it is
* in, so don't do clean up.
*/
if (try_exit_code == -ETIMEDOUT) {
kunit_err(test, "test case cleanup timed out\n");
/*
* Unknown internal error occurred preventing test case from
* running, so there is nothing to clean up.
*/
} else {
kunit_err(test, "internal error occurred during test case cleanup: %d\n",
try_exit_code);
}
return;
}
kunit_err(test, "test aborted during cleanup. continuing without cleaning up\n");
}
static void kunit_catch_run_case(void *data)
{
struct kunit_try_catch_context *ctx = data;
struct kunit *test = ctx->test;
int try_exit_code = kunit_try_catch_get_result(&test->try_catch);
if (try_exit_code) {
kunit_set_failure(test);
/*
* Test case could not finish, we have no idea what state it is
* in, so don't do clean up.
*/
if (try_exit_code == -ETIMEDOUT) {
kunit_err(test, "test case timed out\n");
/*
* Unknown internal error occurred preventing test case from
* running, so there is nothing to clean up.
*/
} else {
kunit_err(test, "internal error occurred preventing test case from running: %d\n",
try_exit_code);
}
return;
}
}
/*
* Performs all logic to run a test case. It also catches most errors that
* occur in a test case and reports them as failures.
*/
static void kunit_run_case_catch_errors(struct kunit_suite *suite,
struct kunit_case *test_case,
struct kunit *test)
{
struct kunit_try_catch_context context;
struct kunit_try_catch *try_catch;
try_catch = &test->try_catch;
kunit_try_catch_init(try_catch,
test,
kunit_try_run_case,
kunit_catch_run_case);
context.test = test;
context.suite = suite;
context.test_case = test_case;
kunit_try_catch_run(try_catch, &context);
/* Now run the cleanup */
kunit_try_catch_init(try_catch,
test,
kunit_try_run_case_cleanup,
kunit_catch_run_case_cleanup);
kunit_try_catch_run(try_catch, &context);
/* Propagate the parameter result to the test case. */
if (test->status == KUNIT_FAILURE)
test_case->status = KUNIT_FAILURE;
else if (test_case->status != KUNIT_FAILURE && test->status == KUNIT_SUCCESS)
test_case->status = KUNIT_SUCCESS;
}
static void kunit_print_suite_stats(struct kunit_suite *suite,
struct kunit_result_stats suite_stats,
struct kunit_result_stats param_stats)
{
if (kunit_should_print_stats(suite_stats)) {
kunit_log(KERN_INFO, suite,
"# %s: pass:%lu fail:%lu skip:%lu total:%lu",
suite->name,
suite_stats.passed,
suite_stats.failed,
suite_stats.skipped,
suite_stats.total);
}
if (kunit_should_print_stats(param_stats)) {
kunit_log(KERN_INFO, suite,
"# Totals: pass:%lu fail:%lu skip:%lu total:%lu",
param_stats.passed,
param_stats.failed,
param_stats.skipped,
param_stats.total);
}
}
static void kunit_update_stats(struct kunit_result_stats *stats,
enum kunit_status status)
{
switch (status) {
case KUNIT_SUCCESS:
stats->passed++;
break;
case KUNIT_SKIPPED:
stats->skipped++;
break;
case KUNIT_FAILURE:
stats->failed++;
break;
}
stats->total++;
}
static void kunit_accumulate_stats(struct kunit_result_stats *total,
struct kunit_result_stats add)
{
total->passed += add.passed;
total->skipped += add.skipped;
total->failed += add.failed;
total->total += add.total;
}
int kunit_run_tests(struct kunit_suite *suite)
{
char param_desc[KUNIT_PARAM_DESC_SIZE];
struct kunit_case *test_case;
struct kunit_result_stats suite_stats = { 0 };
struct kunit_result_stats total_stats = { 0 };
/* Taint the kernel so we know we've run tests. */
add_taint(TAINT_TEST, LOCKDEP_STILL_OK);
if (suite->suite_init) {
suite->suite_init_err = suite->suite_init(suite);
if (suite->suite_init_err) {
kunit_err(suite, KUNIT_SUBTEST_INDENT
"# failed to initialize (%d)", suite->suite_init_err);
goto suite_end;
}
}
kunit_print_suite_start(suite);
kunit_suite_for_each_test_case(suite, test_case) {
struct kunit test = { .param_value = NULL, .param_index = 0 };
struct kunit_result_stats param_stats = { 0 };
kunit_init_test(&test, test_case->name, test_case->log);
if (test_case->status == KUNIT_SKIPPED) {
/* Test marked as skip */
test.status = KUNIT_SKIPPED;
kunit_update_stats(¶m_stats, test.status);
} else if (!test_case->generate_params) {
/* Non-parameterised test. */
test_case->status = KUNIT_SKIPPED;
kunit_run_case_catch_errors(suite, test_case, &test);
kunit_update_stats(¶m_stats, test.status);
} else {
/* Get initial param. */
param_desc[0] = '\0';
test.param_value = test_case->generate_params(NULL, param_desc);
test_case->status = KUNIT_SKIPPED;
kunit_log(KERN_INFO, &test, KUNIT_SUBTEST_INDENT KUNIT_SUBTEST_INDENT
"KTAP version 1\n");
kunit_log(KERN_INFO, &test, KUNIT_SUBTEST_INDENT KUNIT_SUBTEST_INDENT
"# Subtest: %s", test_case->name);
while (test.param_value) {
kunit_run_case_catch_errors(suite, test_case, &test);
if (param_desc[0] == '\0') {
snprintf(param_desc, sizeof(param_desc),
"param-%d", test.param_index);
}
kunit_print_ok_not_ok(&test, KUNIT_LEVEL_CASE_PARAM,
test.status,
test.param_index + 1,
param_desc,
test.status_comment);
kunit_update_stats(¶m_stats, test.status);
/* Get next param. */
param_desc[0] = '\0';
test.param_value = test_case->generate_params(test.param_value, param_desc);
test.param_index++;
test.status = KUNIT_SUCCESS;
test.status_comment[0] = '\0';
test.priv = NULL;
}
}
kunit_print_attr((void *)test_case, true, KUNIT_LEVEL_CASE);
kunit_print_test_stats(&test, param_stats);
kunit_print_ok_not_ok(&test, KUNIT_LEVEL_CASE, test_case->status,
kunit_test_case_num(suite, test_case),
test_case->name,
test.status_comment);
kunit_update_stats(&suite_stats, test_case->status);
kunit_accumulate_stats(&total_stats, param_stats);
}
if (suite->suite_exit)
suite->suite_exit(suite);
kunit_print_suite_stats(suite, suite_stats, total_stats);
suite_end:
kunit_print_suite_end(suite);
return 0;
}
EXPORT_SYMBOL_GPL(kunit_run_tests);
static void kunit_init_suite(struct kunit_suite *suite)
{
kunit_debugfs_create_suite(suite);
suite->status_comment[0] = '\0';
suite->suite_init_err = 0;
if (suite->log)
string_stream_clear(suite->log);
}
bool kunit_enabled(void)
{
return enable_param;
}
int __kunit_test_suites_init(struct kunit_suite * const * const suites, int num_suites)
{
unsigned int i;
if (num_suites == 0)
return 0;
if (!kunit_enabled() && num_suites > 0) {
pr_info("kunit: disabled\n");
return 0;
}
kunit_suite_counter = 1;
/* Use mutex lock to guard against running tests concurrently. */
if (mutex_lock_interruptible(&kunit_run_lock)) {
pr_err("kunit: test interrupted\n");
return -EINTR;
}
static_branch_inc(&kunit_running);
for (i = 0; i < num_suites; i++) {
kunit_init_suite(suites[i]);
kunit_run_tests(suites[i]);
}
static_branch_dec(&kunit_running);
mutex_unlock(&kunit_run_lock);
return 0;
}
EXPORT_SYMBOL_GPL(__kunit_test_suites_init);
static void kunit_exit_suite(struct kunit_suite *suite)
{
kunit_debugfs_destroy_suite(suite);
}
void __kunit_test_suites_exit(struct kunit_suite **suites, int num_suites)
{
unsigned int i;
if (!kunit_enabled())
return;
for (i = 0; i < num_suites; i++)
kunit_exit_suite(suites[i]);
}
EXPORT_SYMBOL_GPL(__kunit_test_suites_exit);
#ifdef CONFIG_MODULES
static void kunit_module_init(struct module *mod)
{
struct kunit_suite_set suite_set, filtered_set;
struct kunit_suite_set normal_suite_set = {
mod->kunit_suites, mod->kunit_suites + mod->num_kunit_suites,
};
struct kunit_suite_set init_suite_set = {
mod->kunit_init_suites, mod->kunit_init_suites + mod->num_kunit_init_suites,
};
const char *action = kunit_action();
int err = 0;
if (mod->num_kunit_init_suites > 0)
suite_set = kunit_merge_suite_sets(init_suite_set, normal_suite_set);
else
suite_set = normal_suite_set;
filtered_set = kunit_filter_suites(&suite_set,
kunit_filter_glob() ?: "*.*",
kunit_filter(), kunit_filter_action(),
&err);
if (err)
pr_err("kunit module: error filtering suites: %d\n", err);
mod->kunit_suites = (struct kunit_suite **)filtered_set.start;
mod->num_kunit_suites = filtered_set.end - filtered_set.start;
if (mod->num_kunit_init_suites > 0)
kfree(suite_set.start);
if (!action)
kunit_exec_run_tests(&filtered_set, false);
else if (!strcmp(action, "list"))
kunit_exec_list_tests(&filtered_set, false);
else if (!strcmp(action, "list_attr"))
kunit_exec_list_tests(&filtered_set, true);
else
pr_err("kunit: unknown action '%s'\n", action);
}
static void kunit_module_exit(struct module *mod)
{
struct kunit_suite_set suite_set = {
mod->kunit_suites, mod->kunit_suites + mod->num_kunit_suites,
};
const char *action = kunit_action();
/*
* Check if the start address is a valid virtual address to detect
* if the module load sequence has failed and the suite set has not
* been initialized and filtered.
*/
if (!suite_set.start || !virt_addr_valid(suite_set.start))
return;
if (!action)
__kunit_test_suites_exit(mod->kunit_suites,
mod->num_kunit_suites);
kunit_free_suite_set(suite_set);
}
static int kunit_module_notify(struct notifier_block *nb, unsigned long val,
void *data)
{
struct module *mod = data;
switch (val) {
case MODULE_STATE_LIVE:
kunit_module_init(mod);
break;
case MODULE_STATE_GOING:
kunit_module_exit(mod);
break;
case MODULE_STATE_COMING:
break;
case MODULE_STATE_UNFORMED:
break;
}
return 0;
}
static struct notifier_block kunit_mod_nb = {
.notifier_call = kunit_module_notify,
.priority = 0,
};
#endif
KUNIT_DEFINE_ACTION_WRAPPER(kfree_action_wrapper, kfree, const void *)
void *kunit_kmalloc_array(struct kunit *test, size_t n, size_t size, gfp_t gfp)
{
void *data;
data = kmalloc_array(n, size, gfp);
if (!data)
return NULL;
if (kunit_add_action_or_reset(test, kfree_action_wrapper, data) != 0)
return NULL;
return data;
}
EXPORT_SYMBOL_GPL(kunit_kmalloc_array);
void kunit_kfree(struct kunit *test, const void *ptr)
{
if (!ptr)
return;
kunit_release_action(test, kfree_action_wrapper, (void *)ptr);
}
EXPORT_SYMBOL_GPL(kunit_kfree);
void kunit_kfree_const(struct kunit *test, const void *x)
{
#if !IS_MODULE(CONFIG_KUNIT)
if (!is_kernel_rodata((unsigned long)x))
#endif
kunit_kfree(test, x);
}
EXPORT_SYMBOL_GPL(kunit_kfree_const);
const char *kunit_kstrdup_const(struct kunit *test, const char *str, gfp_t gfp)
{
#if !IS_MODULE(CONFIG_KUNIT)
if (is_kernel_rodata((unsigned long)str))
return str;
#endif
return kunit_kstrdup(test, str, gfp);
}
EXPORT_SYMBOL_GPL(kunit_kstrdup_const);
void kunit_cleanup(struct kunit *test)
{
struct kunit_resource *res;
unsigned long flags;
/*
* test->resources is a stack - each allocation must be freed in the
* reverse order from which it was added since one resource may depend
* on another for its entire lifetime.
* Also, we cannot use the normal list_for_each constructs, even the
* safe ones because *arbitrary* nodes may be deleted when
* kunit_resource_free is called; the list_for_each_safe variants only
* protect against the current node being deleted, not the next.
*/
while (true) {
spin_lock_irqsave(&test->lock, flags);
if (list_empty(&test->resources)) {
spin_unlock_irqrestore(&test->lock, flags);
break;
}
res = list_last_entry(&test->resources,
struct kunit_resource,
node);
/*
* Need to unlock here as a resource may remove another
* resource, and this can't happen if the test->lock
* is held.
*/
spin_unlock_irqrestore(&test->lock, flags);
kunit_remove_resource(test, res);
}
current->kunit_test = NULL;
}
EXPORT_SYMBOL_GPL(kunit_cleanup);
static int __init kunit_init(void)
{
/* Install the KUnit hook functions. */
kunit_install_hooks();
kunit_debugfs_init();
kunit_bus_init();
#ifdef CONFIG_MODULES
return register_module_notifier(&kunit_mod_nb);
#else
return 0;
#endif
}
late_initcall(kunit_init);
static void __exit kunit_exit(void)
{
memset(&kunit_hooks, 0, sizeof(kunit_hooks));
#ifdef CONFIG_MODULES
unregister_module_notifier(&kunit_mod_nb);
#endif
kunit_bus_shutdown();
kunit_debugfs_cleanup();
}
module_exit(kunit_exit);
MODULE_DESCRIPTION("Base unit test (KUnit) API");
MODULE_LICENSE("GPL v2");