linux-kernel - Re: [PATCH] fix adjtimex() freq return error

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Message-ID: <Pine.LNX.4.64.0808201352190.2507@localhost.localdomain>
Date:	Wed, 20 Aug 2008 14:02:23 +0200 (CEST)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	john stultz <johnstul@...ibm.com>,
	Martin Ziegler <ziegler@...-freiburg.de>,
	lkml <linux-kernel@...r.kernel.org>, stable@...nel.org
Subject: Re: [PATCH] fix adjtimex() freq return error

Hi,

On Tue, 19 Aug 2008, Andrew Morton wrote:

> On Tue, 19 Aug 2008 19:29:06 -0700 john stultz <johnstul@...ibm.com> wrote:
> 
> > Martin Ziegler reported a bug in adjtimex(), where odd positive 
> > frequencies are reduced by 1 while negative values are correct.

To put this in perspective one should also know that 1 here means an error 
of 2^-16ppm or less than 0.02nsec.
When I wrote this code, I noticed that the rounding isn't perfect, but 
OTOH the error is so small that it can't have any practical relevance.
AFAIC the old code is fine as is.

bye, Roman
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