The more relaxed memory ordering od the __raw_{write,read}b broke things
on ppc in the recent rivafb cleanups.

[ Uglyness alert: only the 8-bit accesses are more strongly serialized. 
  The 16- and 32-bit ones have always been relaxed. Gaah. ]
Signed-off-by: Guido Guenther <agx@sigxcpu.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>