linux-kernel - Re: [PATCH 2/4] watchdog/softlockup: Replace "watchdog/%u" threads with cpu_stop

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Date:   Thu, 7 Jun 2018 16:24:05 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     mingo@...nel.org, oleg@...hat.com, gkohli@...eaurora.org
Cc:     tglx@...utronix.de, mpe@...erman.id.au, bigeasy@...utronix.de,
        linux-kernel@...r.kernel.org, will.deacon@....com
Subject: Re: [PATCH 2/4] watchdog/softlockup: Replace "watchdog/%u" threads
 with cpu_stop_work

On Thu, Jun 07, 2018 at 02:33:12PM +0200, Peter Zijlstra wrote:

> +static int softlockup_stop_fn(void *data)
>  {
> +	watchdog_disable(smp_processor_id());
> +	return 0;
>  }
>  
> +static void softlockup_stop_all(void)
>  {
> +	int cpu;
> +
> +	for_each_cpu(cpu, &watchdog_allowed_mask)
> +		stop_one_cpu(cpu, softlockup_stop_fn, NULL);
> +
> +	cpumask_clear(&watchdog_allowed_mask);
>  }

Bugger, that one doesn't quite work.. watchdog_disable() ends up calling
a sleeping function. I forgot to enable all the debug cruft when
testing..

Let me try and fix that..