Linus Torvalds wrote:
> Because the types aren't at all compatible any more, the macros that are
> used for user-level "dev_t" are no longer working for a kdev_t. So we have
> 
>         dev_t                   kdev_t
> 
>         MKDEV(major,minor)      mk_kdev(major, minor)
>         MAJOR(dev)              major(dev)
>         MINOR(dev)              minor(dev)
>         dev == dev2             kdev_same(dev, dev2)
>         !dev                    kdev_none(dev)

And, assignments "kdev_t foo = 0" become "kdev_t foo = NODEV".

At least I hope so ;-)  The below patch fixes up rd.c and loop.c.

-- 
Jeff Garzik      | Only so many songs can be sung
Building 1024    | with two lips, two lungs, and one tongue.
MandrakeSoft     |         - nomeansno