[PATCH] sibling map initializing rework

Make sibling map init per-cpu.  Hotplug CPU may change the map at runtime.

Signed-off-by: Li <Shaohua&lt;shaohua.li@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>