On Tue, 12 Apr 2022 13:29:42 -0700 Axel Rasmussen <axelrasmussen@xxxxxxxxxx> wrote: > Prefer this new interface, but if using it fails for any reason just > fall back to using userfaultfd(2) as before. This seems a poor idea - the old interface will henceforth be untested. Why not tweak the code to test both interfaces?