// SPDX-License-Identifier: LGPL-2.1+ #include <kunit/test.h>#include <linux/rtc.h> /* * Advance a date by one day. */static void advance_date(int *year, int *month, int *mday, int *yday){	if (*mday != rtc_month_days(*month - 1, *year)) {		++*mday;		++*yday;		return;	} 	*mday = 1;	if (*month != 12) {		++*month;		++*yday;		return;	} 	*month = 1;	*yday  = 1;	++*year;} /* * Check every day in specified number of years interval starting on 1970-01-01 * against the expected result. */static void rtc_time64_to_tm_test_date_range(struct kunit *test, int years){	/*	 * years	= (years / 400) * 400 years	 *		= (years / 400) * 146097 days	 *		= (years / 400) * 146097 * 86400 seconds	 */	time64_t total_secs = ((time64_t)years) / 400 * 146097 * 86400; 	int year	= 1970;	int month	= 1;	int mday	= 1;	int yday	= 1; 	struct rtc_time result;	time64_t secs;	s64 days; 	for (secs = 0; secs <= total_secs; secs += 86400) { 		rtc_time64_to_tm(secs, &result); 		days = div_s64(secs, 86400); 		#define FAIL_MSG "%d/%02d/%02d (%2d) : %lld", \			year, month, mday, yday, days 		KUNIT_ASSERT_EQ_MSG(test, year - 1900, result.tm_year, FAIL_MSG);		KUNIT_ASSERT_EQ_MSG(test, month - 1, result.tm_mon, FAIL_MSG);		KUNIT_ASSERT_EQ_MSG(test, mday, result.tm_mday, FAIL_MSG);		KUNIT_ASSERT_EQ_MSG(test, yday, result.tm_yday, FAIL_MSG); 		advance_date(&year, &month, &mday, &yday);	}} /* * Checks every day in a 160000 years interval starting on 1970-01-01 * against the expected result. */static void rtc_time64_to_tm_test_date_range_160000(struct kunit *test){	rtc_time64_to_tm_test_date_range(test, 160000);} /* * Checks every day in a 1000 years interval starting on 1970-01-01 * against the expected result. */static void rtc_time64_to_tm_test_date_range_1000(struct kunit *test){	rtc_time64_to_tm_test_date_range(test, 1000);} static struct kunit_case rtc_lib_test_cases[] = {	KUNIT_CASE(rtc_time64_to_tm_test_date_range_1000),	KUNIT_CASE_SLOW(rtc_time64_to_tm_test_date_range_160000),	{}}; static struct kunit_suite rtc_lib_test_suite = {	.name = "rtc_lib_test_cases",	.test_cases = rtc_lib_test_cases,}; kunit_test_suite(rtc_lib_test_suite); MODULE_DESCRIPTION("KUnit test for RTC lib functions");MODULE_LICENSE("GPL");