Attached patch:

     whitespace: Use `define-globalized-minor-mode' for global mode

     * lisp/whitespace.el (global-whitespace-mode): Fix interoperability
     between `whitespace-mode' and `global-whitespace-mode' by using
     `define-globalized-minor-mode'.
     * test/lisp/whitespace-tests.el (whitespace-tests--global): Add a
     regression test.

It would be nice to install this on emacs-29, but I'm OK with this going 
on master.