rcu/nocb: Create kthreads on all CPUs if "rcu_nocbs=" or "nohz_full=" are passed

In order to be able to (de-)offload any CPU using cpusets in the future,
create the NOCB data structures for all possible CPUs.  For now this is
done only as long as the "rcu_nocbs=" or "nohz_full=" kernel parameters
are passed to avoid the unnecessary overhead for most users.

Note that the rcuog and rcuoc kthreads are not created until at least
one of the corresponding CPUs comes online.  This approach avoids the
creation of excess kthreads when firmware lies about the number of CPUs
present on the system.

Reviewed-by: Neeraj Upadhyay <[email protected]>
Signed-off-by: Frederic Weisbecker <[email protected]>
Cc: Boqun Feng <[email protected]>
Cc: Uladzislau Rezki <[email protected]>
Cc: Josh Triplett <[email protected]>
Cc: Joel Fernandes <[email protected]>
Tested-by: Juri Lelli <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>

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