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Subject[PATCH tip/core/rcu 0/2] RCU force_quiescent_state() fix and dyntick cleanup
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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