Subject: Re: [RFC][patch 00/12] clocksource / timekeeping rework V2
From: Daniel Walker <dwalker@fifo99.com>
To: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
       Thomas Gleixner <tglx@linutronix.de>, john stultz <johnstul@us.ibm.com>
In-Reply-To: <20090730150456.6c87b997@skybase>
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	 <20090730125351.6f16e9ec@skybase> <1248958173.6046.32.camel@desktop>
	 <20090730150456.6c87b997@skybase>
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Date: Thu, 30 Jul 2009 06:49:10 -0700
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On Thu, 2009-07-30 at 15:04 +0200, Martin Schwidefsky wrote:
> On Thu, 30 Jul 2009 05:49:33 -0700
> Daniel Walker <dwalker@fifo99.com> wrote:
> 
> > On Thu, 2009-07-30 at 12:53 +0200, Martin Schwidefsky wrote:
> > 
> > > > I'm not sure allowing that type of override a good idea tho .. I don't
> > > > think it's considered a usable clock when the rating goes to zero.
> > > 
> > > Override as the root user -> your foot, no? The whole override stuff is
> > > there for the case that the clocksource selection picked a broken clock
> > > and you want to force the system into a semi-working state. Ideally the
> > > whole override would go away, but that is probably wishful thinking..
> > 
> > I would agree if the system doesn't crash as a result, if it just starts
> > to operate funny then that's maybe acceptable. If you keep the change
> > rating function, you could potentially remove the unregister path..
> 
> Why shouldn't it be possible to have a clocksource as a module? I think
> that the unregister path should stay. To really make it work we'd need
> a function to force the system out of the one-shot mode though.

Because I don't think there is a sane reason to allow it. It should be
more like if someone has a need for it, then let them add back the
unregister path and explain why they need it.

Daniel

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