linux-kernel - Re: [PATCH 0/3] Cleanup ADJ

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Message-ID: <20101228133631.GA27825@riccoc20.at.omicron.at>
Date:	Tue, 28 Dec 2010 14:36:31 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	John Stultz <john.stultz@...aro.org>
Cc:	linux-kernel@...r.kernel.org,
	Richard Cochran <richard.cochran@...cron.at>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 0/3] Cleanup ADJ_SETOFFSET patch

On Tue, Dec 28, 2010 at 01:53:32PM +0100, Richard Cochran wrote:
> {sec, nsec}        sum
> -------------------------
> {-2, +600000000}  -1.4
> {-2, +700000000}  -1.3
> {-2, +800000000}  -1.2
> {-2, +900000000}  -1.1
> {-1,  000000000}  -1.0
> {-1, +100000000}  -0.9
> {-1, +200000000}  -0.8
> {-1, +300000000}  -0.7
> 
> If we say that the time value or interval in a timespec is always the
> sum of the fields, still it would seem that the ktime code is broken
> according to that assumption.

Okay, now I think I get it.

The value of a timespec is the sum of its fields. The tv_nsec field
should always be non-negative.

So, if a user space program wants to jump the clock back by one-tenth
second, it must pass a timespec with value {-1,900000000}.

Right?

Thanks,
Richard
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