linux-kernel - Re: 3.10-rc3: WARNING: at kernel/time/tick-broadcast.c:578

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Date:	Mon, 27 May 2013 20:06:07 +0300 (EEST)
From:	Meelis Roos <mroos@...ux.ee>
To:	Thomas Gleixner <tglx@...utronix.de>
cc:	Borislav Petkov <bp@...en8.de>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Len Brown <lenb@...nel.org>, "Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: 3.10-rc3: WARNING: at kernel/time/tick-broadcast.c:578

> Found another possibility how we end up with the stale flag.

This cures it, thank you!

> diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
> index 24938d5..0c73942 100644
> --- a/kernel/time/tick-broadcast.c
> +++ b/kernel/time/tick-broadcast.c
> @@ -511,6 +511,12 @@ again:
>  		}
>  	}
>  
> +	/*
> +	 * Remove the current cpu from the pending mask. The event is
> +	 * delivered immediately in tick_do_broadcast() !
> +	 */
> +	cpumask_clear_cpu(smp_processor_id(), tick_broadcast_pending_mask);
> +
>  	/* Take care of enforced broadcast requests */
>  	cpumask_or(tmpmask, tmpmask, tick_broadcast_force_mask);
>  	cpumask_clear(tick_broadcast_force_mask);
> @@ -575,8 +581,8 @@ void tick_broadcast_oneshot_control(unsigned long reason)
>  
>  	raw_spin_lock_irqsave(&tick_broadcast_lock, flags);
>  	if (reason == CLOCK_EVT_NOTIFY_BROADCAST_ENTER) {
> -		WARN_ON_ONCE(cpumask_test_cpu(cpu, tick_broadcast_pending_mask));
>  		if (!cpumask_test_and_set_cpu(cpu, tick_broadcast_oneshot_mask)) {
> +			WARN_ON_ONCE(cpumask_test_cpu(cpu, tick_broadcast_pending_mask));
>  			clockevents_set_mode(dev, CLOCK_EVT_MODE_SHUTDOWN);
>  			/*
>  			 * We only reprogram the broadcast timer if we
> 

-- 
Meelis Roos (mroos@...ux.ee)
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