On Tue, Aug 10, 2021 at 03:12:27PM +0200, Peter Rajnoha wrote:

(I'm not counting the very corner use case of
'dmsetup --addnodeoncreate --verifyudev' which now ends up with a dev node
in /dev that logically returns -ENODEV when accessed instead of zero-sized
device as it was before.)

 
Yes.  That facility was provided to assist people having to work with
old or incorrect code or misconfigured systems and breaking it in this
way shouldn't be a concern.  (We could possibly still patch it up to
continue to do the best thing after the patchset goes in.)

Alasdair