linux-kernel - Re: [ANNOUNCE] 3.12.6-rt9

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Message-ID: <20140122222701.4c44b08d@tor.valhalla.alchemy.lu>
Date:	Wed, 22 Jan 2014 22:27:01 +0100
From:	Joakim Hernberg <jbh@...hemy.lu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Mike Galbraith <bitbucket@...ine.de>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Kacur <jkacur@...hat.com>
Subject: Re: [ANNOUNCE] 3.12.6-rt9

On Mon, 20 Jan 2014 21:17:36 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> I happen to have a i7 box to test on, and sure enough, the latest
> 3.12-rt locks up on boot and reverting the
> timers-do-not-raise-softirq-unconditionally.patch, it boots fine.

> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> 
> diff --git a/kernel/timer.c b/kernel/timer.c
> index 46467be..8212c10 100644
> --- a/kernel/timer.c
> +++ b/kernel/timer.c
> @@ -1464,13 +1464,11 @@ void run_local_timers(void)
>  		raise_softirq(TIMER_SOFTIRQ);
>  		return;
>  	}
> -	if (!base->active_timers)
> -		goto out;
>  
>  	/* Check whether the next pending timer has expired */
>  	if (time_before_eq(base->next_timer, jiffies))
>  		raise_softirq(TIMER_SOFTIRQ);
> -out:
> +
>  	rt_spin_unlock_after_trylock_in_irq(&base->lock);
>  
>  }

This fixes the problem on my i7-2600k.

-- 

   Joakim
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