task would be to clean up interfaces like moving functions around between
files to better group them and improving the interfaces like dropping return
values for functions that never fail. Then write kerneldoc for all exported
-functions and an overview section and integrate it all into the drm DocBook.
+functions and an overview section and integrate it all into the drm book.
See https://dri.freedesktop.org/docs/drm/ for what's there already.