From: Uwe Kleine-König Date: Mon, 28 Apr 2025 10:06:51 +0000 (+0200) Subject: rtc: test: Test date conversion for dates starting in 1900 X-Git-Tag: v6.16-rc1~41^2~1 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ccb2dba3c19f04d2203a4b630180bf50fe710d22;p=thirdparty%2Fkernel%2Flinux.git rtc: test: Test date conversion for dates starting in 1900 While the RTC framework intends to only handle dates after 1970 for consumers, time conversion must also work for earlier dates to cover e.g. storing dates beyond an RTC's range_max. This is most relevant for the rtc-mt6397 driver that has range_min = RTC_TIMESTAMP_BEGIN_1900; range_max = mktime64(2027, 12, 31, 23, 59, 59); and so needs working support for timestamps in 1900 starting in less than three years. So shift the tested interval of timestamps to also cover years 1900 to 1970. Signed-off-by: Uwe Kleine-König Signed-off-by: Alexandre Mergnat Link: https://lore.kernel.org/r/20250428-enable-rtc-v4-5-2b2f7e3f9349@baylibre.com Signed-off-by: Alexandre Belloni --- diff --git a/drivers/rtc/lib_test.c b/drivers/rtc/lib_test.c index b1ac0701d42e5..0eebad1fe2a09 100644 --- a/drivers/rtc/lib_test.c +++ b/drivers/rtc/lib_test.c @@ -41,15 +41,15 @@ static void rtc_time64_to_tm_test_date_range(struct kunit *test, int years) */ time64_t total_secs = ((time64_t)years) / 400 * 146097 * 86400; - int year = 1970; + int year = 1900; int month = 1; int mday = 1; int yday = 1; - int wday = 4; /* Jan 1st 1970 was a Thursday */ + int wday = 1; /* Jan 1st 1900 was a Monday */ struct rtc_time result; time64_t secs; - const time64_t sec_offset = ((1 * 60) + 2) * 60 + 3; + const time64_t sec_offset = RTC_TIMESTAMP_BEGIN_1900 + ((1 * 60) + 2) * 60 + 3; for (secs = 0; secs <= total_secs; secs += 86400) { @@ -72,7 +72,7 @@ static void rtc_time64_to_tm_test_date_range(struct kunit *test, int years) } /* - * Checks every day in a 160000 years interval starting on 1970-01-01 + * Checks every day in a 160000 years interval starting on 1900-01-01 * against the expected result. */ static void rtc_time64_to_tm_test_date_range_160000(struct kunit *test) @@ -81,7 +81,7 @@ static void rtc_time64_to_tm_test_date_range_160000(struct kunit *test) } /* - * Checks every day in a 1000 years interval starting on 1970-01-01 + * Checks every day in a 1000 years interval starting on 1900-01-01 * against the expected result. */ static void rtc_time64_to_tm_test_date_range_1000(struct kunit *test)