Messages in this thread Patch in this message | | | From | Richard Cochran <> | Subject | [PATCH net-next 02/11] timecounter: provide a helper function to shift the time. | Date | Sun, 21 Dec 2014 19:46:57 +0100 |
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Some PTP Hardware Clock drivers use a struct timecounter to represent their clock. To adjust the time by a given offset, these drivers all perform a two step read/write of their timecounter. However, it is better and simpler just to adjust the offset in one step. This patch introduces a little routine to help drivers implement the adjtime method.
Suggested-by: Janusz Użycki <j.uzycki@elproma.com.pl> Signed-off-by: Richard Cochran <richardcochran@gmail.com> --- include/linux/timecounter.h | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/include/linux/timecounter.h b/include/linux/timecounter.h index 146f07a..af3dfa4 100644 --- a/include/linux/timecounter.h +++ b/include/linux/timecounter.h @@ -79,6 +79,15 @@ static inline u64 cyclecounter_cyc2ns(const struct cyclecounter *cc, } /** + * timecounter_adjtime - Shifts the time of the clock. + * @delta: Desired change in nanoseconds. + */ +static inline void timecounter_adjtime(struct timecounter *tc, s64 delta) +{ + tc->nsec += delta; +} + +/** * timecounter_init - initialize a time counter * @tc: Pointer to time counter which is to be initialized/reset * @cc: A cycle counter, ready to be used. -- 1.7.10.4
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