Use CPU_DOWN_FAILED notifier in the sched-domains hotplug code.  This goes
with 4/8 "integrate cpu hotplug and sched domains"
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>