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| author | Richard Cochran <richardcochran@gmail.com> | 2011-02-01 13:52:20 +0000 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2011-02-02 15:28:18 +0100 |
| commit | 094aa1881fdc1b8889b442eb3511b31f3ec2b762 (patch) | |
| tree | 2eec808286e2f57eff45178741ba3ea048de7c37 | |
| parent | c528f7c6c208f1fae6b4025957173dec045e5f21 (diff) | |
| download | linux-094aa1881fdc1b8889b442eb3511b31f3ec2b762.tar.gz linux-094aa1881fdc1b8889b442eb3511b31f3ec2b762.tar.bz2 linux-094aa1881fdc1b8889b442eb3511b31f3ec2b762.zip | |
ntp: Add ADJ_SETOFFSET mode bit
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 <richard.cochran@omicron.at>
Acked-by: John Stultz <johnstul@us.ibm.com>
LKML-Reference: <20110201134320.688829863@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | include/linux/timex.h | 3 | ||||
| -rw-r--r-- | kernel/time/ntp.c | 11 |
2 files changed, 13 insertions, 1 deletions
diff --git a/include/linux/timex.h b/include/linux/timex.h index d23999f9499d..aa60fe7b6ed6 100644 --- a/include/linux/timex.h +++ b/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 */ diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c index ed8cfdf16983..5ac593267a26 100644 --- a/kernel/time/ntp.c +++ b/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); |