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ntp: Add ADJ_SETOFFSET mode bit

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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>
This commit is contained in:
Richard Cochran 2011-02-01 13:52:20 +00:00 • committed by Thomas Gleixner
commit 094aa1881f
2 changed files with 13 additions and 1 deletions
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3
include/linux/timex.h
View file

@ -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 */

11
kernel/time/ntp.c
View file

@ -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);