Just a happy path test.

Signed-off-by: Dorjoy Chowdhury <dorjoychy111@gmail.com>
---
 .../testing/selftests/openat2/openat2_test.c  | 46 ++++++++++++++++++-
 1 file changed, 45 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/openat2/openat2_test.c b/tools/testing/selftests/openat2/openat2_test.c
index 0e161ef9e9e4..238de9cff291 100644
--- a/tools/testing/selftests/openat2/openat2_test.c
+++ b/tools/testing/selftests/openat2/openat2_test.c
@@ -320,8 +320,51 @@ void test_openat2_flags(void)
 	}
 }
 
+#ifndef OPENAT2_REGULAR
+#define OPENAT2_REGULAR 040000000
+#endif
+
+#ifndef EFTYPE
+#define EFTYPE 134
+#endif
+
+void test_openat2_regular_flag(void)
+{
+	if (!openat2_supported) {
+		ksft_test_result_skip("Skipping %s as openat2 is not supported\n", __func__);
+		return;
+	}
+
+	struct open_how how = {
+		.flags = OPENAT2_REGULAR | O_RDONLY
+	};
+
+	int fd = sys_openat2(AT_FDCWD, "/dev/null", &how);
+
+	if (fd == -ENOENT) {
+		ksft_test_result_skip("Skipping %s as there is no /dev/null\n", __func__);
+		return;
+	}
+
+	if (fd != -EFTYPE) {
+		ksft_test_result_fail("openat2 should return EFTYPE\n");
+		return;
+	}
+
+	how.flags = OPENAT2_REGULAR | O_DIRECTORY | O_RDONLY;
+
+	fd = sys_openat2(AT_FDCWD, "/dev", &how);
+
+	if (fd < 0) {
+		ksft_test_result_fail("openat2 should open directory with both O_DIRECTORY and OPENAT2_REGULAR\n");
+		return;
+	}
+
+	ksft_test_result_pass("%s succeeded\n", __func__);
+}
+
 #define NUM_TESTS (NUM_OPENAT2_STRUCT_VARIATIONS * NUM_OPENAT2_STRUCT_TESTS + \
-		   NUM_OPENAT2_FLAG_TESTS)
+		   NUM_OPENAT2_FLAG_TESTS + 1)
 
 int main(int argc, char **argv)
 {
@@ -330,6 +373,7 @@ int main(int argc, char **argv)
 
 	test_openat2_struct();
 	test_openat2_flags();
+	test_openat2_regular_flag();
 
 	if (ksft_get_fail_cnt() + ksft_get_error_cnt() > 0)
 		ksft_exit_fail();
-- 
2.53.0