Re: [PATCH v2] perf: Synchronously cleanup child events

[Peter Zijlstra]

On Tue, Jan 19, 2016 at 05:12:34PM +0200, Alexander Shishkin wrote:
> +static bool put_event_last(struct perf_event *event)
>  {
> +	if (atomic_long_cmpxchg(&event->refcount, 1, 0)) {

	if (atomic_long_cmpxchg(&event->refcount, 1, 0) == 1) {

> +		__put_event(event);
> +		return true;
> +	}
> +
> +	return false;
>  }