tree ee7c5c73455fedcec11f9e5f0b218a40324a80c9
parent 08e8ea1b45c2f62aadc6dff73ade2942a28030bb
author Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1405103424 -0700
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1405338510 -0700

rcu: Create rcuo kthreads only for onlined CPUs

RCU currently uses for_each_possible_cpu() to spawn rcuo kthreads,
which can result in more rcuo kthreads than one would expect, for
example, derRichard reported 64 CPUs worth of rcuo kthreads on an
8-CPU image.  This commit therefore creates rcuo kthreads only for
those CPUs that actually come online.

This was reported by derRichard on the OFTC IRC network.

Reported-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>