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From: "Kuwahara,T." <6vvetjsrt26xsrzlh1z0zn4d2grdah@gmail.com>
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>
Subject: Re: [PATCH V8 02/13] ntp: add ADJ_SETOFFSET mode bit
Date: Thu, 13 Jan 2011 05:39:04 +0900	[thread overview]
Message-ID: <AANLkTikYuYwb4BLsU3BF_=d9fAdcfb0AC2itDBeyFsNq@mail.gmail.com> (raw)
In-Reply-To: <1294779309.3441.66.camel@work-vm>

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.

  reply	other threads:[~2011-01-12 20:39 UTC|newest]

Thread overview: 76+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-12-31 19:11 [PATCH V8 00/13] ptp: IEEE 1588 hardware clock support Richard Cochran
2010-12-31 19:11 ` Richard Cochran
2010-12-31 19:12 ` [PATCH V8 01/13] time: Introduce timekeeping_inject_offset John Stultz
2010-12-31 19:12   ` John Stultz
2011-01-06 22:00   ` Arnd Bergmann
2011-01-06 22:00     ` Arnd Bergmann
2011-01-06 22:00     ` Arnd Bergmann
2010-12-31 19:12 ` [PATCH V8 02/13] ntp: add ADJ_SETOFFSET mode bit Richard Cochran
2010-12-31 19:12   ` Richard Cochran
2011-01-01 20:38   ` Kuwahara,T.
2011-01-01 20:38     ` Kuwahara,T.
2011-01-08 17:50     ` Richard Cochran
2011-01-08 17:50       ` Richard Cochran
2011-01-09 21:07       ` Kuwahara,T.
2011-01-09 21:07         ` Kuwahara,T.
2011-01-10  7:17         ` Richard Cochran
2011-01-10  7:17           ` Richard Cochran
2011-01-10 20:47           ` Kuwahara,T.
2011-01-10 20:47             ` Kuwahara,T.
2011-01-10 21:11             ` john stultz
2011-01-11 11:09             ` Richard Cochran
2011-01-10  7:22         ` Richard Cochran
2011-01-10 16:49         ` john stultz
2011-01-10 16:49           ` john stultz
2011-01-10 20:45           ` Kuwahara,T.
2011-01-10 20:45             ` Kuwahara,T.
2011-01-10 21:06             ` john stultz
2011-01-10 21:06               ` john stultz
2011-01-11 20:32               ` Kuwahara,T.
2011-01-11 20:32                 ` Kuwahara,T.
2011-01-11 20:55                 ` john stultz
2011-01-11 20:55                   ` john stultz
2011-01-12 20:39                   ` Kuwahara,T. [this message]
2011-01-12 20:55                     ` john stultz
2011-01-12 20:55                       ` john stultz
2010-12-31 19:13 ` [PATCH V8 03/13] posix clocks: introduce a syscall for clock tuning Richard Cochran
2010-12-31 19:13 ` [PATCH V8 04/13] posix_clocks: add clock_adjtime for arm Richard Cochran
2010-12-31 19:13   ` Richard Cochran
2010-12-31 19:14 ` [PATCH V8 05/13] posix_clocks: add clock_adjtime for blackfin Richard Cochran
2010-12-31 19:14 ` [PATCH V8 06/13] posix_clocks: add clock_adjtime for powerpc Richard Cochran
2010-12-31 19:14 ` [PATCH V8 07/13] posix_clocks: add clock_adjtime for x86 Richard Cochran
2010-12-31 19:15 ` [PATCH V8 08/13] posix clocks: cleanup the CLOCK_DISPTACH macro Richard Cochran
2010-12-31 19:15   ` Richard Cochran
2011-01-03  9:29   ` Peter Zijlstra
2011-01-03 11:51     ` Richard Cochran
2011-01-03 11:51       ` Richard Cochran
2011-01-11 12:57   ` Thomas Gleixner
2011-01-11 12:57     ` Thomas Gleixner
2011-01-12  7:37     ` Richard Cochran
2011-01-12  7:37       ` Richard Cochran
2011-01-12 11:16       ` Thomas Gleixner
2011-01-12 11:16         ` Thomas Gleixner
2011-01-12 12:17         ` Richard Cochran
2011-01-13  4:30     ` Richard Cochran
2011-01-13  4:30       ` Richard Cochran
2011-01-13 11:25       ` Thomas Gleixner
2011-01-13 11:25         ` Thomas Gleixner
2010-12-31 19:15 ` [PATCH V8 09/13] posix clocks: introduce dynamic clocks Richard Cochran
2010-12-31 19:15   ` Richard Cochran
2011-01-06 19:56   ` Arnd Bergmann
2011-01-06 19:56     ` Arnd Bergmann
2011-01-07 16:41     ` Richard Cochran
2010-12-31 19:16 ` [PATCH V8 10/13] ptp: Added a brand new class driver for ptp clocks Richard Cochran
2010-12-31 19:16 ` [PATCH V8 11/13] ptp: Added a clock that uses the eTSEC found on the MPC85xx Richard Cochran
2010-12-31 19:16   ` Richard Cochran
2010-12-31 19:17 ` [PATCH V8 12/13] ptp: Added a clock driver for the IXP46x Richard Cochran
2010-12-31 19:17   ` Richard Cochran
2011-01-06 21:01   ` Krzysztof Halasa
2011-01-07 17:07     ` Richard Cochran
2011-01-07 17:07       ` Richard Cochran
2011-01-08 16:25       ` Krzysztof Halasa
2011-01-08 16:25         ` Krzysztof Halasa
2011-01-10 20:24       ` Krzysztof Halasa
2011-01-10 20:24         ` Krzysztof Halasa
2010-12-31 19:17 ` [PATCH V8 13/13] ptp: Added a clock driver for the National Semiconductor PHYTER Richard Cochran
2010-12-31 19:17   ` Richard Cochran

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