asm-ppc/reg.h defines pollutes namespace like there's no tomorrow;
among other things there are
	LR
	SR0...SR15
	DEC
etc.

That breaks quite a few drivers that should otherwise work on ppc.  SR...
and LR were never used by ppc code; commented out in reg.h (note that
they are just aliases for SPRN_SR... and SPRN_LR).  RPA commented out and
its instances in ppc code (all four of them) replaced with SPRN_RPA.  Ditto
for DEC.  The rest of the offenders (DAR and PVR) are left alone for now and
#undef'ed in drivers in question.

We probably want to rip all these guys out of reg.h and convert ppc users
to SPRN_... forms - file ends up included in alot of places and namespace
pollution like that is a Bad Thing(tm).
Signed-off-by: Linus Torvalds <torvalds@osdl.org>