From: Mark Salter on
gitlab.com
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/2450#note_1375...
There was also an earlier commit 23baf831a32c which changed the meaning of
MAX_ORDER. The old MAX_ORDER meant the max alloc order was MAX_ORDER-1, but
after 23baf831a32c, the max alloc order is MAX_ORDER. So we also need to
change our configs to keep things as they were.