The only place that was using the paca pointer that was in the naca was some
assembler that used it to find a parameter to pass to some C code.  That C
code did not even declare that parameter!

Remove the paca pointer.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>