netdev - Re: [PATCH V7 1/8] ntp: add ADJ

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Message-ID: <AANLkTi=yGoFwYt4p_LeHtAQyYgmURspO-p57UdL0sUEZ@mail.gmail.com>
Date:	Sat, 18 Dec 2010 05:16:52 +0900
From:	"Kuwahara,T." <6vvetjsrt26xsrzlh1z0zn4d2grdah@...il.com>
To:	Richard Cochran <richardcochran@...il.com>
Cc:	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>,
	John Stultz <johnstul@...ibm.com>,
	Krzysztof Halasa <khc@...waw.pl>,
	Peter Zijlstra <peterz@...radead.org>,
	Rodolfo Giometti <giometti@...ux.it>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH V7 1/8] ntp: add ADJ_SETOFFSET mode bit

On 12/17/10, Richard Cochran <richardcochran@...il.com> wrote:
> This patch adds a new mode bit into the timex structure. When set, the bit
> instructs the kernel to add the given time value to the current time.
>

The proposed new control mode, ADJ_SETOFFSET, is logically the same as
ADJ_OFFSET with timex.constant == -INFINITY.  So it is possible to do
the same thing without risking forward compatibility.  (I mean by "risking
forward compatibility" that the mode bit 0x0040 may be defined differently
by the upstream maintainer anytime in the future.)
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