linux-kernel - Re: [uClinux-dev] [PATCH] m68k: restore lost coldfire CLOCK_TICK

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Message-ID: <20090624211144.GA13167@frolo.macqel>
Date:	Wed, 24 Jun 2009 23:11:44 +0200
From:	Philippe De Muyter <phdm@...qel.be>
To:	uClinux development list <uclinux-dev@...inux.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [uClinux-dev] [PATCH] m68k: restore lost coldfire
	CLOCK_TICK_RATE

Hi Greg,

On Mon, Jun 22, 2009 at 01:18:55PM +1000, Greg Ungerer wrote:
> HI Philippe,
>
> Philippe De Muyter wrote:
>> Hello list,
>> The good definition of CLOCK_TICK_RATE for coldfires has been lost in the
>> merge of m68k and m68knommu include files.  Restore it.  Culprit :
>> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=ebafc17468d58bd903c886175ca84a4edc69ae1d;hp=34055b806a6334624e7e8af6eefc3aee42372a85
>> Signed-off-by: Philippe De Muyter <phdm@...qel.be>
>
> Is it needed?
> What is broken with the existing value?

I am no ntp expert, but IIRC kernel/time/ntp.c needs to know the remainder
of CLOCK_TICK_RATE / HZ to obtain a good stability of the time.  That's
probably only needed when you have ntpd running.

Philippe
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