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    SubjectRe: [PATCH V7 1/8] ntp: add ADJ_SETOFFSET mode bit
    On Sat, 2010-12-18 at 05:16 +0900, Kuwahara,T. wrote:
    > On 12/17/10, Richard Cochran <> 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.

    I'm not sure if this is correct. Its more like settimeofday, only giving
    a relative offset to jump the clock, rather then an absolute time. It
    does not slew the clock over time like ADJ_OFFSET does.

    > 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.)

    adjtimex is a linux specific interface, which is compatible but not
    identical to the ntp specified interfaces. The ntp client code already
    has Linux specific modifications, so I don't think we have to worry
    about 0x40 specifically being reserved by the NTP client.


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