Clean up our idle loop code:

- Remove a bunch of useless includes and make most functions static
- There were places where we werent disabling interrupts before checking
  need_resched then calling the hypervisor to sleep our thread. We might
  race with an IPI and end up missing a reschedule. Disable interrupts
  around these regions to make them safe.
- We forgot to turn off the polling flag when exiting the dedicated_idle
  idle loop. This could have resulted in all manner problems as other
  cpus would avoid sending IPIs to force reschedules.
- Add a missing check for cpu_is_offline in the shared cpu idle loop.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>