From: David Hildenbrand on
gitlab.com
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/1023#note_5508...
Oh, there seems to be a mark_tech_preview() -- thanks for the hint. I
guess we should directly use that when activating regions.
I added the warn for cma_release() just to make troubleshooting easier
-- if cma_release() is never called we can exclude the freeing part.