[PATCH] x86_64: set do_not_nx as cpuinitdata

'check_efer' uses 'do_not_nx'. Hotpluged CPU could wrongly disable NX.

Signed-off-by: Shaohua <Li&lt;shaohua.li@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>