linux-kernel - Re: [PATCH 2/3] ntp: add ADJ

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Message-ID: <20110104083733.GA4563@riccoc20.at.omicron.at>
Date:	Tue, 4 Jan 2011 09:37:33 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	John Stultz <john.stultz@...aro.org>
Cc:	"Kuwahara,T." <6vvetjsrt26xsrzlh1z0zn4d2grdah@...il.com>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Richard Cochran <richard.cochran@...cron.at>
Subject: Re: [PATCH 2/3] ntp: add ADJ_SETOFFSET mode bit

On Mon, Jan 03, 2011 at 12:44:26PM -0800, John Stultz wrote:
> On Wed, 2010-12-29 at 05:47 +0900, Kuwahara,T. wrote:
> > I came up with this simple solution: "Just use ADJ_OFFSET as usual,
> > but don't forget to disable the kernel PLL."
> 
> Again, this seems to be trying to add new functionality into a corner
> case of a existing mode.
> 
> I don't like this because it makes testing and validating that the code
> is correct for its uses difficult. Especially given that a number of
> combinations of modes might be set at once. What happens to freq
> adjustments done at the same time as an ADJ_OFFSET - STA_PLL?

Where are the mode bits and their combinations documented, anyhow?

There are lot of papers on NTP, and I have not read them all, but I
don't recall having seen a precise and succinct decription of the
ntp_adjtime interface anywhere.

Thanks,
Richard
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