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.
+
+22: Newly-added code has been compiled with `gcc -W'. This will generate
+ lots of noise, but is good for finding bugs like "warning: comparison
+ between signed and unsigned".