From: Richard Cochran 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. Signed-off-by: Richard Cochran Cc: John Stultz LKML-Reference: <2f7ed6bce83c23e4b7e4530794f0aa175df31a39.1296124770.git.richard.cochran@omicron.at> Signed-off-by: Thomas Gleixner --- include/linux/timex.h | 3 ++- kernel/time/ntp.c | 11 +++++++++++ 2 files changed, 13 insertions(+), 1 deletion(-) Index: linux-2.6-tip/include/linux/timex.h =================================================================== --- linux-2.6-tip.orig/include/linux/timex.h +++ linux-2.6-tip/include/linux/timex.h @@ -73,7 +73,7 @@ struct timex { long tolerance; /* clock frequency tolerance (ppm) * (read only) */ - struct timeval time; /* (read only) */ + struct timeval time; /* (read only, except for ADJ_SETOFFSET) */ long tick; /* (modified) usecs between clock ticks */ long ppsfreq; /* pps frequency (scaled ppm) (ro) */ @@ -102,6 +102,7 @@ struct timex { #define ADJ_STATUS 0x0010 /* clock status */ #define ADJ_TIMECONST 0x0020 /* pll time constant */ #define ADJ_TAI 0x0080 /* set TAI offset */ +#define ADJ_SETOFFSET 0x0100 /* add 'time' to current time */ #define ADJ_MICRO 0x1000 /* select microsecond resolution */ #define ADJ_NANO 0x2000 /* select nanosecond resolution */ #define ADJ_TICK 0x4000 /* tick value */ Index: linux-2.6-tip/kernel/time/ntp.c =================================================================== --- linux-2.6-tip.orig/kernel/time/ntp.c +++ linux-2.6-tip/kernel/time/ntp.c @@ -648,6 +648,17 @@ int do_adjtimex(struct timex *txc) hrtimer_cancel(&leap_timer); } + if (txc->modes & ADJ_SETOFFSET) { + struct timespec delta; + if ((unsigned long)txc->time.tv_usec >= NSEC_PER_SEC) + return -EINVAL; + delta.tv_sec = txc->time.tv_sec; + delta.tv_nsec = txc->time.tv_usec; + if (!(txc->modes & ADJ_NANO)) + delta.tv_nsec *= 1000; + timekeeping_inject_offset(&delta); + } + getnstimeofday(&ts); write_seqlock_irq(&xtime_lock); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/