linux-kernel - Re: [ANNOUNCE] 3.0-rt6

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Date:	Mon, 08 Aug 2011 10:25:25 -0700
From:	Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [ANNOUNCE] 3.0-rt6

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?

If this was later part of rt8 then yes, Tracey was able to boot on 
fc15/x86_64 with no further problems (3.0.1 + rt8). I was also able to 
boot rt8 this morning in my fc15 test laptop with no bugs or oops so 
far... still testing but looks promising.

Thanks again!
-- Fernando


> ---
> 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;
>
> --
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