On Wed, 2015-07-22 at 15:30 -0700, Andrew Morton wrote:

selftests is a pretty scrappy place.  It's partly a dumping ground for
things so useful test code doesn't just get lost and bitrotted.  Partly
a framework so people who add features can easily test them. Partly to
provide tools to architecture maintainers when they wire up new
syscalls and the like.

Yeah, ipc, for instance, also sucks _badly_ in selftests.