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Subject[PATCH tip/core/rcu 0/2] rcu: further grace-period processing cleanups
This patch set provides a couple of additional grace-period-processing

1. Propagate ->completed through the rcu_node hierarchy
when RCU goes idle to prevent an additional needless
grace period from being started.

2. Make force_quiescent_state() take a snapshot of ->gpnum-1
rather than ->completed for consistency with rcu_sched_qs()
and friends.

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