On Wed, May 26, 2021 at 11:21:36AM +0300, Evgeny Novikov wrote: > Now I see that we need to restrict in specifications those values that > can be passed to the install callback of tty_operations according to > a first actual argument of tty_alloc_driver(). Thank you for pointing > this out. I do not understand what you mean here at all, sorry. What "specifications"? confused, greg k-h