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    SubjectRe: [RFC PATCH 5/6] implement per-cpu&per-domain state machine call_srcu()
    From
    >
    >> +               }
    >> +       }
    >> +       spin_unlock_irq(&sp->gp_lock);
    >> +
    >> +       flush_workqueue(srcu_callback_wq);
    >
    > Since you already waited for the completions one by one, what's the
    > purpose of this?

    srcu callbacks are preemptible/sleepable here, so they may not
    complete in order,
    some may not finish here. so srcu_barrier() needs to wait them.


    >
    >> +}
    >> +EXPORT_SYMBOL_GPL(srcu_barrier);
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