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From: "Kuwahara,T." <6vvetjsrt26xsrzlh1z0zn4d2grdah@gmail.com>
Date: Thu, 13 Jan 2011 05:39:04 +0900
Message-ID: <AANLkTikYuYwb4BLsU3BF_=d9fAdcfb0AC2itDBeyFsNq@mail.gmail.com>
Subject: Re: [PATCH V8 02/13] ntp: add ADJ_SETOFFSET mode bit
To: john stultz <johnstul@us.ibm.com>
Cc: Richard Cochran <richardcochran@gmail.com>, linux-kernel@vger.kernel.org,
        linux-api@vger.kernel.org, netdev@vger.kernel.org,
        Alan Cox <alan@lxorguk.ukuu.org.uk>, Arnd Bergmann <arnd@arndb.de>,
        Christoph Lameter <cl@linux.com>, David Miller <davem@davemloft.net>,
        Krzysztof Halasa <khc@pm.waw.pl>,
        Peter Zijlstra <peterz@infradead.org>,
        Rodolfo Giometti <giometti@linux.it>,
        Thomas Gleixner <tglx@linutronix.de>
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On Wed, Jan 12, 2011 at 5:55 AM, john stultz <johnstul@us.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.