rcu: add tracing for RCU's kthread run states.
Add tracing to help debugging situations when RCU's kthreads are not running but are supposed to be. Signed-off-by: NPaul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: NJosh Triplett <josh@joshtriplett.org>
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