This patch fixes 3 problems with the nommu.c support code:

1. export mem_map and vmtruncate (to make them the same as MMU version)

2. update the total_vm usage in mmap routines
   Without this the OOM killer has no "badness" points to rate
   processes on...

   This patch was originally submitted by Giovanni Casoli
   <giovanni.casoli@atengineering.it> for a 2.4.26 kernel.
   I applied it to the 2.6.9 code.

3. provide stub for arch_get_unmapped_area
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>