foo.diff

diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h
index b634969cbb6f..da4c91793cdc 100644
--- a/tools/testing/selftests/kselftest_harness.h
+++ b/tools/testing/selftests/kselftest_harness.h
@@ -450,14 +450,18 @@ static inline pid_t clone3_vfork(void)
                                _metadata->exit_code = KSFT_FAIL; \
                        } \
                } \
+               _Bool expected = false; \
+               _Bool desired = true; \
+               _Bool weak = false; \
+               int memorder = __ATOMIC_SEQ_CST; \
                if (child == 0) { \
                        if (_metadata->setup_completed && !fixture_name##_teardown_parent && \
-                                       __sync_bool_compare_and_swap(teardown, false, true)) \
+                                       __atomic_compare_exchange(teardown, &expected, &desired, weak, memorder, memorder)) \
                                fixture_name##_teardown(_metadata, self, variant->data); \
                        _exit(0); \
                } \
                if (_metadata->setup_completed && fixture_name##_teardown_parent && \
-                               __sync_bool_compare_and_swap(teardown, false, true)) \
+                               __atomic_compare_exchange(teardown, &expected, &desired, weak, memorder, memorder)) \
                        fixture_name##_teardown(_metadata, self, variant->data); \
                munmap(teardown, sizeof(*teardown)); \
                if (self && fixture_name##_teardown_parent) \