linux-kernel - Re: [ANNOUNCE] 3.4.41-rt55-feat1

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Message-ID: <1366893787.10248.4.camel@gandalf.local.home>
Date:	Thu, 25 Apr 2013 08:43:07 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mike Galbraith <bitbucket@...ine.de>
Cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Tim Sander <tim.sander@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Carsten Emde <C.Emde@...dl.org>, John Kacur <jkacur@...hat.com>
Subject: Re: [ANNOUNCE] 3.4.41-rt55-feat1

On Thu, 2013-04-25 at 14:36 +0200, Mike Galbraith wrote:
> On Thu, 2013-04-25 at 14:32 +0200, Sebastian Andrzej Siewior wrote: 
> > On 04/25/2013 01:14 PM, Tim Sander wrote:
> > > Hi 
> > > 
> > > I just wanted to test this release but it fails to compile with the the 
> > > following error:
> > > 
> > > kernel/hrtimer.c: In function '__hrtimer_start_range_ns':
> > > kernel/hrtimer.c:1045:7: error: implicit declaration of function 
> > > 'hrtimer_rt_defer'
> > > kernel/hrtimer.c: At top level:
> > > kernel/hrtimer.c:1416:12: error: static declaration of 'hrtimer_rt_defer' 
> > > follows non-static declaration
> > > kernel/hrtimer.c:1045:10: note: previous implicit declaration of 
> > > 'hrtimer_rt_defer' was here
> > > 
> > > The kernelconfig is attached.
> > 
> > You do not have CONFIG_HIGH_RES_TIMERS defined. Is this on purpose?
> 
> git@...ge:~/linux-2.6> ls -1 arch/arm/configs|wc -l
> 122
> git@...ge:~/linux-2.6> grep -IR CONFIG_HIGH_RES_TIMERS arch/arm/configs|wc -l
> 31
> 
> Oh.  Sniff, poor little things.
> 
> hrtimer: fix hrtimer free zone build bug

Perhaps the better solution is to select HIGH_RES_TIMERS when
PREEMPT_RT_FULL is selected?

-- Steve

> 
> Signed-off-by: Mike Galbraith <bitbucket@...ine.de>
> 
> diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
> index 2328c04..31d57a2 100644
> --- a/kernel/hrtimer.c
> +++ b/kernel/hrtimer.c
> @@ -1036,7 +1036,7 @@ int __hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
>  		&& hrtimer_enqueue_reprogram(timer, new_base)) {
>  
>  		if (wakeup
> -#ifdef CONFIG_PREEMPT_RT_BASE
> +#if defined(CONFIG_PREEMPT_RT_BASE) && defined(CONFIG_HIGH_RES_TIMERS)
>  		    /*
>  		     * Move softirq based timers away from the rbtree in
>  		     * case it expired already. Otherwise we would have a
> 


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