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().



Paul E. McKenney 2011-12-16