19: All new userspace interfaces are documented in Documentation/ABI/.
See Documentation/ABI/README for more information.
+
+20: Check that it all passes `make headers_check'.
+
+21: Has been checked with injection of at least slab and page-allocation
+ fauilures. See Documentation/fault-injection/.
+
+ If the new code is substantial, addition of subsystem-specific fault
+ injection might be appropriate.