Subject: Re: 2.6.23-rc7-mm1
From: Thomas Gleixner <tglx@linutronix.de>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Torsten Kaiser <just.for.lkml@googlemail.com>,
       linux-kernel@vger.kernel.org, Len Brown <lenb@kernel.org>
In-Reply-To: <20070924123450.f9e54d3d.akpm@linux-foundation.org>
References: <20070924021716.9bfe7dfb.akpm@linux-foundation.org>
	 <64bb37e0709241207q1c188b35ua485a06776ed4bf2@mail.gmail.com>
	 <20070924123450.f9e54d3d.akpm@linux-foundation.org>
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Date: Mon, 24 Sep 2007 22:25:12 +0200
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On Mon, 2007-09-24 at 12:34 -0700, Andrew Morton wrote:
> > It prints twice 'System halted' and blinks the keyboard leds, but does
> > not switch off. On all other kernel version I only see one keyboard
> > blink before the power goes out.
> 
> ok...
> 
> > I compared its dmesg to vanilla-rc7 and -rc4-mm1, but expect that rc-4
> > assigns different IRQs I can't see any differences except the normal
> > variation in BogoMips etc.

Can your check whether 2.6.23-rc7 +
http://tglx.de/projects/hrtimers/2.6.23-rc7/patch-2.6.23-rc7-hrt1.patch

works for you ?

> hm, dunno.  The only substantial patch which touches
> arch/x86_64/kernel/process.c (which is where cpu_idle lives) is
> x86_64-prep-idle-loop-for-dynticks.patch.
> 
> The problem is, 2.6.23-rc6-mm1's git-acpi patch had all the new cpuidle
> code in it.  Len dropped all that code over the weekend (which is when I
> picked this copy of his tree), so 2.6.23-rc7-mm1 doesn't have the cpuidle
> code.  Len will be reapplying the cpuidle patches today(ish) so next -mm
> _will_ have the cpuidle code.
> 
> So what we have in rc7-mm1 is this transient no-cpuidle state.  It could be
> that the x86_64 dynticks code (which was developed previously tested in
> conjunction with the cpuidle patches) has some dependency on cpuidle.

It should not. cpuidle makes use of dynticks not the other way round.

	tglx


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