Greg Kroah-Hartman [off-list ref] wrote:

Hm, good point, but there should be some way to test this to verify it
works.  Maybe for the other types of events?

Keyrings is the simplest.  keyutils's testsuite will handle that.  I'm trying
to work out if I can simply make every macro in there that does a modification
perform a watch automatically to make sure the appropriate events happen.

David