5.0 deleted three io schedulers and more importantly CONFIG_DEFAULT_IOSCHED option:
commit f382fb0bcef4c37dc049e9f6963e3baf204d815c
block: remove legacy IO schedulers
After figuring out that I silently became "noop" customer enabling just
BFQ didn't work: "noop" is still being selected by default.
There is an "elevator=" command line option but it does nothing.
Are users supposed to add stuff to init scripts now?
