What's the policy about using arithmetic on void * in the kernel?
It's not ANSI (as far as I know), but works with gcc.
I try to avoid it, and it seems others do too, but there are
a dozen uses of it in the kernel.  If they shouldn't be there
I can take care of them.
Furthermore, if they shouldn't be there we should add -Wpointer-arith
to the compiler flags.

   -- Lennart