netdev - Re: [PATCH V8 02/13] ntp: add ADJ

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Message-ID: <AANLkTikYuYwb4BLsU3BF_=d9fAdcfb0AC2itDBeyFsNq@mail.gmail.com>
Date:	Thu, 13 Jan 2011 05:39:04 +0900
From:	"Kuwahara,T." <6vvetjsrt26xsrzlh1z0zn4d2grdah@...il.com>
To:	john stultz <johnstul@...ibm.com>
Cc:	Richard Cochran <richardcochran@...il.com>,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	netdev@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Christoph Lameter <cl@...ux.com>,
	David Miller <davem@...emloft.net>,
	Krzysztof Halasa <khc@...waw.pl>,
	Peter Zijlstra <peterz@...radead.org>,
	Rodolfo Giometti <giometti@...ux.it>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH V8 02/13] ntp: add ADJ_SETOFFSET mode bit

On Wed, Jan 12, 2011 at 5:55 AM, john stultz <johnstul@...ibm.com> wrote:
> So the kernel handles leap second insertion via a timer. Thus at the end
> of 23:59:59, it will inject a leapsecond by setting the time back by one
> second (back to 23:59:59) and setting the TIME_OOP flag.
>
> This timer is an absolute timer, so if someone moves the clock forward
> across the 23:59:59 boundary, the adjustment will still be made.
>
> The patch is not broken, nor useless.

It takes into account only one upcoming leap second, but ignores all
the others.  That's not sufficient for arbitrary adjustments.
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