[PATCH RFC 2/4] selftests: harness: Set global current_test_metadata for each test run

[Ackerley Tng <ackerleytng@google.com>]

Set global current_test_metadata for each test run so other test frameworks
can choose to access fields for the current test.

This avoids having to pass _metadata down through functions so that
code defined other functions can still use fields in _metadata.

Test functions t->fn() are executed in series, so during the runtime of the
test function, the function can count on current_test_metadata accurately
being the metadata for the running test.

Signed-off-by: Ackerley Tng <ackerleytng@google.com>
---
 tools/testing/selftests/kselftest_harness.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h
index 68cde1556ac41..85d9b4527fca6 100644
--- a/tools/testing/selftests/kselftest_harness.h
+++ b/tools/testing/selftests/kselftest_harness.h
@@ -1151,6 +1151,8 @@ static bool test_enabled(int argc, char **argv,
 	return !has_positive;
 }
 
+struct __test_metadata *current_test_metadata;
+
 static void __run_test(struct __fixture_metadata *f,
 		       struct __fixture_variant_metadata *variant,
 		       struct __test_metadata *t)
@@ -1182,7 +1184,9 @@ static void __run_test(struct __fixture_metadata *f,
 		t->exit_code = KSFT_FAIL;
 	} else if (child == 0) {
 		setpgrp();
+		current_test_metadata = t;
 		t->fn(t, variant);
+		current_test_metadata = NULL;
 		_exit(t->exit_code);
 	} else {
 		t->pid = child;

-- 
2.54.0.rc0.605.g598a273b03-goog