D.4.2.2.5 rcu_try_flip_flag
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D.4.2.2.5 `rcu_try_flip_flag`

The rcu_try_flip_flag per-CPU variable alerts the corresponding CPU that the grace-period counter has recently been incremented, and also records that CPU's acknowledgment. Once a given CPU has acknowledged the counter flip, all subsequent actions taken by rcu_read_lock() on that CPU must account for the new value of the grace-period counter, in particular, when incrementing rcu_flipctr in rcu_read_lock().