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Date: Thu, 04 Aug 2011 12:05:12 -0700
From: Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU>
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To: Peter Zijlstra <peterz@infradead.org>
CC: Thomas Gleixner <tglx@linutronix.de>, LKML <linux-kernel@vger.kernel.org>,
        linux-rt-users <linux-rt-users@vger.kernel.org>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU>
Subject: Re: [ANNOUNCE] 3.0-rt6
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Was going to try this but it appears it is in rt7, trying to build rt7 
fails with:

ERROR: "of_find_property" [drivers/tty/serial/of_serial.ko] undefined!
ERROR: "of_find_property" [drivers/hwmon/ltc4245.ko] undefined!

-- Fernando

On 08/04/2011 02:42 AM, Peter Zijlstra wrote:
> On Wed, 2011-08-03 at 23:34 -0700, Fernando Lopez-Lezcano wrote:
>> [  117.026009]  [<ffffffff814ef322>] _raw_spin_lock+0x45/0x79
>> [  117.026009]  [<ffffffff8107b6f1>] ? __run_posix_cpu_timers+0x8f/0x353
>> [  117.026009]  [<ffffffff8107b6f1>] __run_posix_cpu_timers+0x8f/0x353
>
> I think its this one, could you confirm?
>
> ---
> Index: linux-2.6/kernel/posix-cpu-timers.c
> ===================================================================
> --- linux-2.6.orig/kernel/posix-cpu-timers.c
> +++ linux-2.6/kernel/posix-cpu-timers.c
> @@ -1288,10 +1288,11 @@ static inline int fastpath_timer_check(s
>   	sig = tsk->signal;
>   	if (sig->cputimer.running) {
>   		struct task_cputime group_sample;
> +		unsigned long flags;
>
> -		raw_spin_lock(&sig->cputimer.lock);
> +		raw_spin_lock_irqsave(&sig->cputimer.lock, flags);
>   		group_sample = sig->cputimer.cputime;
> -		raw_spin_unlock(&sig->cputimer.lock);
> +		raw_spin_unlock_irqrestore(&sig->cputimer.lock, flags);
>
>   		if (task_cputime_expired(&group_sample,&sig->cputime_expires))
>   			return 1;
>