The paca currently contains an iseries only structure which is quite large
(~1kB).  The following patch removes this overhead on pseries and g5
kernels.

Since the paca is no longer required to be page aligned, remove it from the
page aligned section.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>