Re: [PATCH v3] watchdog: add watchdog_cpumask sysctl to assist nohz

[Peter Zijlstra]

On Thu, Apr 02, 2015 at 01:39:28PM -0400, cmetcalf@xxxxxxxxxx wrote:
> @@ -431,6 +434,10 @@ static void watchdog_enable(unsigned int cpu)
>  	hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
>  	hrtimer->function = watchdog_timer_fn;
>  
> +	/* Exit if the cpu is not allowed for watchdog. */
> +	if (!cpumask_test_cpu(cpu, watchdog_mask))
> +		do_exit(0);
> +

Ick, that doesn't look right for smpboot threads.
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