Re: [PATCH 1/3] idle: add support for tasks that inject idle

[Peter Zijlstra]

On Wed, Nov 09, 2016 at 11:05:10AM -0800, Jacob Pan wrote:
> +void play_idle()
> +{
> +	/*
> +	 * Only FIFO tasks can disable the tick since they don't need the forced
> +	 * preemption.
> +	 */
> +	WARN_ON_ONCE(current->policy != SCHED_FIFO);
> +	WARN_ON_ONCE(current->nr_cpus_allowed != 1);
> +	WARN_ON_ONCE(!(current->flags & PF_KTHREAD));
> +	WARN_ON_ONCE(!(current->flags & PF_NO_SETAFFINITY));
> +	rcu_sleep_check();
> +
> +	preempt_disable();
> +	current->flags |= PF_IDLE;
> +	do_idle();
> +	current->flags &= ~PF_IDLE;
> +
> +	preempt_fold_need_resched();
> +	preempt_enable();
> +}
> +EXPORT_SYMBOL_GPL(play_idle);

Hurm.. didn't this initially also include the setup of the timer and
take an timeout argument?