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selftests: timers: nsleep-lat: Check all calls to clock_nanosleep() and clock_gettime()

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Both these functions can fail.

The first calls to those functions are already checked and result in
KSFT_SKIP.

If they start failing afterwards unexpectedly, report a hard error.

Signed-off-by: Thomas Weißschuh (Schneider Electric) <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Acked-by: John Stultz <jstultz@google.com>
Link: https://patch.msgid.link/20260803-auxclock-nanosleep-prep-v2-17-910cbd485390@linutronix.de
This commit is contained in:
Thomas Weißschuh (Schneider Electric)
2026-08-03 12:04:48 +02:00
committed by Thomas Gleixner
parent 0f474ee80c
commit 4fa377c19e
1 changed files with 16 additions and 7 deletions
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23
tools/testing/selftests/timers/nsleep-lat.c
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@@ -65,10 +65,16 @@ int nanosleep_lat_test(int clockid, long long ns)
count = 10;
/* First check relative latency */
clock_gettime(clockid, &start);
for (i = 0; i < count; i++)
clock_nanosleep(clockid, 0, &target, NULL);
clock_gettime(clockid, &end);
if (clock_gettime(clockid, &start))
return KSFT_FAIL;
for (i = 0; i < count; i++) {
if (clock_nanosleep(clockid, 0, &target, NULL))
return KSFT_FAIL;
}
if (clock_gettime(clockid, &end))
return KSFT_FAIL;
if (((timespec_sub(start, end)/count)-ns) > UNRESONABLE_LATENCY) {
ksft_print_msg("Large rel latency: %lld ns :", (timespec_sub(start, end)/count)-ns);
@@ -77,10 +83,13 @@ int nanosleep_lat_test(int clockid, long long ns)
/* Next check absolute latency */
for (i = 0; i < count; i++) {
clock_gettime(clockid, &start);
if (clock_gettime(clockid, &start))
return KSFT_FAIL;
target = timespec_add(start, ns);
clock_nanosleep(clockid, TIMER_ABSTIME, &target, NULL);
clock_gettime(clockid, &end);
if (clock_nanosleep(clockid, TIMER_ABSTIME, &target, NULL))
return KSFT_FAIL;
if (clock_gettime(clockid, &end))
return KSFT_FAIL;
latency += timespec_sub(target, end);
}