On Wed, Jun 24, 2015 at 07:28:18PM +0200, Peter Zijlstra wrote:
> +unlock:
> + /* MCS style queue 'unlock' */
> + next = READ_ONCE(entry.next);
> + if (!next) {
> + if (cmpxchg(&rsp->expedited_queue, &entry, NULL) == &entry)
> + goto done;
> + while (!(next = READ_ONCE(entry.next)))
> + cpu_relax();
> + }
> + smp_store_release(&next->done, 1);
Do you suppose:
wake_up_process(next->task);
would help? :-)
>
> +done:
> put_online_cpus();
> }
> EXPORT_SYMBOL_GPL(synchronize_sched_expedited);
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