[PATCH tip/core/rcu 0/2] RCU force_quiescent_state() fix anddyntick cleanup

[Paul E. McKenney]

This patch series contains a cleanup and a fix:

o	Code cleanup from Lai Jiangshan that makes the calls to
	rcu_irq_enter() and rcu_irq_exit() more obviously correct.
	The previous code worked because rcu_irq_exit() is always
	an empty function if !NO_HZ.

o	Fix a low-probability race in the TREE_RCU infrastructure
	that can be triggered by extremely long grace periods.

						Thanx, Paul
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