rcu: Grace-period-kthread related sleeps to idle priority
This commit converts the long-standing schedule_timeout_interruptible()
and schedule_timeout_uninterruptible() calls used by RCU's grace-period
kthread to schedule_timeout_idle(). This conversion avoids polluting
the load-average with RCU-related sleeping.
Signed-off-by:
Paul E. McKenney <paulmck@kernel.org>
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