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

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Date:	Thu, 25 Apr 2013 16:22:26 +0200
From:	"Tim Sander" <tim.sander@....com>
To:	"Sebastian Andrzej Siewior" <bigeasy@...utronix.de>
Cc:	"Steven Rostedt" <rostedt@...dmis.org>,
	"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

Hi Sebastian
> > 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?
Yes, it's an tradeoff to get lower latencies for our VII (Very Important 
Interrupt :-). The idea is from Thomas Gleixner: We have an regular interrupt 
and define our own timer where which we call after we have finished our VII 
handler. But normally the HR_TIMER is set. So we switched it off on this very 
purpose. As we also have also PREEMPT_RT_FULL set the proposed solution to 
allow only PREEMPT_RT_FULL with PREEMPT_RT_FULL set is not an option for us.

Best regards
Tim

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