From: Leo Weppelman <leo@wau.mis.ah.nl>
   Date: Wed, 17 Apr 1996 09:52:17 +0200 (MET DST)

   I have seen a couple of kernel panics lately that all originated from
   pmap_remove. The trouble is the check if the segment table of the
   current process is changed. It turns out that in a considerable number
   of cases, curproc == NULL. As page-zero is a valid page on the atari
   (and as far as I know this is true on most m68k-ports), the pointer

On Amiga it is not.