linux-kernel - Re: [NTP 5/9] add time

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Message-ID: <Pine.LNX.4.64.0608201914310.6761@scrub.home>
Date:	Sun, 20 Aug 2006 19:25:14 +0200 (CEST)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Atsushi Nemoto <anemo@....ocn.ne.jp>
cc:	akpm@...l.org, linux-kernel@...r.kernel.org, johnstul@...ibm.com
Subject: Re: [NTP 5/9] add time_adjust to tick length

Hi,

On Mon, 21 Aug 2006, Atsushi Nemoto wrote:

> On Thu, 10 Aug 2006 02:01:51 +0200, zippel@...ux-m68k.org wrote:
> > This folds update_ntp_one_tick() into second_overflow() and adds
> > time_adjust to the tick length, this makes time_next_adjust unnecessary.
> > This slightly changes the adjtime() behaviour, instead of applying it to
> > the next tick, it's applied to the next second.
> ...
> > -/* Don't completely fail for HZ > 500.  */
> > -int tickadj = 500/HZ ? : 1;		/* microsecs */
> 
> The tickadj is used by cris, frv, m32r, m68k, mips and sparc.  This
> patch would break build on those platforms.
> 
> I have not looked at this patch closely yet.  Just a report.

Oops, I indeed missed that. I searched for if anyone would change that 
value, but later forgot about the other users.
A simple solution would be to move this (constant) value to a header and 
another rather simple solution would be to remove it completely, as it's 
rather bogus anyway. These users check time_adjust, which is unused in a 
NTP controlled system. The correct value to check would be the tick 
length, but I'm sure it's really worth the trouble.

bye, Roman
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