It turns out there are more issues with our VPA code:

1. vpa_init doesnt report errors when it fails.  This was masking a bug
   where the VPA spanned 2 pages and phyp failed to register it.

2. We call idle_setup before we initialise the boot cpus vpa.  This
   means we never select the shared processor idle loop.

3. We dont call vpa_init on UP kernels.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>