D.4.2.2.6 rcu_mb_flag
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D.4.2.2.6 `rcu_mb_flag`

The rcu_mb_flag per-CPU variable alerts the corresponding CPU that it must execute a memory barrier in order for the grace-period state machine to proceed, and also records that CPU's acknowledgment. Once a given CPU has executed its memory barrier, the memory operations of all prior RCU read-side critical will be visible to any code sequenced after the corresponding grace period.