Allow idle_balance to search an incresingly larger span of cpus to find a
cpu.  Minor change, NODE_SD_INIT gets SD_BALANCE_NEWIDLE flag.  This is
critical for x86_64, where there is only one cpu oer node.  In the current
code, idle_balance for Opteron -never- works.

Signed-off-by: <habanero@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>