Re: [PATCH V7 1/8] ntp: add ADJ_SETOFFSET mode bit

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On Sat, Dec 18, 2010 at 05:16:52AM +0900, Kuwahara,T. wrote:
> On 12/17/10, Richard Cochran <richardcochran@xxxxxxxxx> 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.)

Can you please elaborate?

I don't see any way to use timex.constant with ADJ_OFFSET in order to
correct a time offset. The 'time_constant' in kernel/time/ntp.c is
restricted to the interval [0..MAXTC], and MAXTC is 10 in timex.h.

Richard
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