selftests: sched: Add more core schedule prctl calls

The core sched kselftest makes prctl calls only with correct parameters. This patch will extend this test with more core schedule prctl calls with wrong parameters to increase code coverage.

---
V1 -> V2: Unnecessary printing removed - 'validate' will automatically print the message in case or error

 tools/testing/selftests/sched/cs_prctl_test.c | 6 ++++++
 1 file changed, 6 insertions(+)

index 25e0d95d3713..3e1619b6bf2d 100644
@@ -334,6 +334,12 @@ int main(int argc, char *argv[])
 	validate(get_cs_cookie(pid) != 0);
 	validate(get_cs_cookie(pid) == get_cs_cookie(procs[pidx].thr_tids[0]));
 
+	validate(_prctl(PR_SCHED_CORE, PR_SCHED_CORE_MAX, 0, PIDTYPE_PGID, 0) < 0
+		&& errno == EINVAL);
+
+	validate(_prctl(PR_SCHED_CORE, PR_SCHED_CORE_SHARE_TO, 0, PIDTYPE_PGID, 1) < 0
+		&& errno == EINVAL);
+
 	if (errors) {
 		printf("TESTS FAILED. errors: %d\n", errors);
 		res = 10;

2.34.1

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Thank you. Now applied to linux-kselftest next for Linux 6.4-rc1.

thanks,
-- Shuah

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