rcu-tasks: Make RCU tasks trace also wait for idle tasks

This commit scans the CPUs, adding each CPU's idle task to the list of
tasks that need quiescent states.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2020-03-22 13:18:54 -07:00
commit 9796e1ae73