Re: [PATCH 3/3] nohz: Use IPI implicit full barrier against rq->nr_running r/w

[Peter Zijlstra]

On Wed, May 14, 2014 at 12:25:56AM +0200, Frederic Weisbecker wrote:
> @@ -670,10 +670,11 @@ bool sched_can_stop_tick(void)
>  
>         rq = this_rq();
>  
> -       /* Make sure rq->nr_running update is visible after the IPI */
> -       smp_rmb();
> -
> -       /* More than one running task need preemption */
> +       /*
> +     * More than one running task need preemption.
> +     * nr_running update is assumed to be visible
> +     * after IPI is sent from wakers.
> +     */
>         if (rq->nr_running > 1)
>                 return false;

Looks like whitespace damage on that comment's indenting.

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