Another compile problem with 2.6.15.5 on AMD64

[Steffen Weber <email@steffenweber.net>]

I´m getting a compile error with 2.6.15.5 on x86_64 using GCC 3.4.4 
(does not seem to be related to the NFS one):

   CC      mm/mempolicy.o
mm/mempolicy.c: In function `get_nodes':
mm/mempolicy.c:527: error: `BITS_PER_BYTE' undeclared (first use in
this function)
mm/mempolicy.c:527: error: (Each undeclared identifier is reported only
once
mm/mempolicy.c:527: error: for each function it appears in.)

It works fine on x86 machines.

Steffen Weber