Re: [ANNOUNCE] 3.4.41-rt55-feat1

From: Tim Sander
Date: Thu Apr 25 2013 - 10:23:38 EST

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

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