add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/tools/testing/selftests/membarrier/.gitignore
..
..
@@ -1 +1,3 @@
1
-membarrier_test
1
+# SPDX-License-Identifier: GPL-2.0-only
2
+membarrier_test_multi_thread
3
+membarrier_test_single_thread