linux-kernel - [PATCH 3/3] selftests: timers: Convert nsleep-lat test to generate KTAP output

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Date:   Wed, 27 Sep 2023 12:18:59 +0200
From:   Mark Brown <broonie@...nel.org>
To:     Shuah Khan <shuah@...nel.org>, John Stultz <jstultz@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 3/3] selftests: timers: Convert nsleep-lat test to generate
 KTAP output

Currently the nsleep-lat test does not produce KTAP output but rather a
custom format. This means that we only get a pass/fail for the suite, not
for each individual test that the suite does. Convert to using the standard
kselftest output functions which result in KTAP output being generated.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
 tools/testing/selftests/timers/nsleep-lat.c | 26 ++++++++++++--------------
 1 file changed, 12 insertions(+), 14 deletions(-)

diff --git a/tools/testing/selftests/timers/nsleep-lat.c b/tools/testing/selftests/timers/nsleep-lat.c
index eb3e79ed7b4a..edb5acacf214 100644
--- a/tools/testing/selftests/timers/nsleep-lat.c
+++ b/tools/testing/selftests/timers/nsleep-lat.c
@@ -118,7 +118,7 @@ int nanosleep_lat_test(int clockid, long long ns)
 	clock_gettime(clockid, &end);
 
 	if (((timespec_sub(start, end)/count)-ns) > UNRESONABLE_LATENCY) {
-		printf("Large rel latency: %lld ns :", (timespec_sub(start, end)/count)-ns);
+		ksft_print_msg("Large rel latency: %lld ns :", (timespec_sub(start, end)/count)-ns);
 		return -1;
 	}
 
@@ -132,20 +132,23 @@ int nanosleep_lat_test(int clockid, long long ns)
 	}
 
 	if (latency/count > UNRESONABLE_LATENCY) {
-		printf("Large abs latency: %lld ns :", latency/count);
+		ksft_print_msg("Large abs latency: %lld ns :", latency/count);
 		return -1;
 	}
 
 	return 0;
 }
 
-
+#define SKIPPED_CLOCK_COUNT 3
 
 int main(int argc, char **argv)
 {
 	long long length;
 	int clockid, ret;
 
+	ksft_print_header();
+	ksft_set_plan(NR_CLOCKIDS - CLOCK_REALTIME - SKIPPED_CLOCK_COUNT);
+
 	for (clockid = CLOCK_REALTIME; clockid < NR_CLOCKIDS; clockid++) {
 
 		/* Skip cputime clockids since nanosleep won't increment cputime */
@@ -154,9 +157,6 @@ int main(int argc, char **argv)
 				clockid == CLOCK_HWSPECIFIC)
 			continue;
 
-		printf("nsleep latency %-26s ", clockstring(clockid));
-		fflush(stdout);
-
 		length = 10;
 		while (length <= (NSEC_PER_SEC * 10)) {
 			ret = nanosleep_lat_test(clockid, length);
@@ -167,14 +167,12 @@ int main(int argc, char **argv)
 		}
 
 		if (ret == UNSUPPORTED) {
-			printf("[UNSUPPORTED]\n");
-			continue;
-		}
-		if (ret < 0) {
-			printf("[FAILED]\n");
-			return ksft_exit_fail();
+			ksft_test_result_skip("%s\n", clockstring(clockid));
+		} else {
+			ksft_test_result(ret >= 0, "%s\n",
+					 clockstring(clockid));
 		}
-		printf("[OK]\n");
 	}
-	return ksft_exit_pass();
+
+	ksft_finished();
 }

-- 
2.39.2