Re: [RFC][PATCH 12/13] stop_machine: Remove lglock

[Peter Zijlstra]

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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