Clean up init_idle to not use wake_up_forked_process, then undo all the stuff
that call does.  Instead, do everything in init_idle.

Make double_rq_lock depend on CONFIG_SMP because it is no longer used on UP.
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>