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time: Introduce timekeeping_inject_offset 

This adds a kernel-internal timekeeping interface to add or subtract
a fixed amount from CLOCK_REALTIME. This makes it so kernel users or
interfaces trying to do so do not have to read the time, then add an
offset and then call settimeofday(), which adds some extra error in
comparision to just simply adding the offset in the kernel timekeeping
core.

Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Richard Cochran <richard.cochran@omicron.at>
LKML-Reference: <20110201134419.584311693@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
John Stultz 2011-02-01 13:52:17 +00:00 committed by Thomas Gleixner
parent 0061748dd2
commit c528f7c6c2
2 changed files with 37 additions and 0 deletions
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1
include/linux/time.h
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@ -166,6 +166,7 @@ extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
extern int timekeeping_valid_for_hres(void);
extern u64 timekeeping_max_deferment(void);
extern void timekeeping_leap_insert(int leapsecond);
extern int timekeeping_inject_offset(struct timespec *ts);
struct tms;
extern void do_sys_times(struct tms *);

36
kernel/time/timekeeping.c
View File

@ -387,6 +387,42 @@ int do_settimeofday(const struct timespec *tv)
EXPORT_SYMBOL(do_settimeofday);
/**
* timekeeping_inject_offset - Adds or subtracts from the current time.
* @tv: pointer to the timespec variable containing the offset
*
* Adds or subtracts an offset value from the current time.
*/
int timekeeping_inject_offset(struct timespec *ts)
{
unsigned long flags;
if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
return -EINVAL;
write_seqlock_irqsave(&xtime_lock, flags);
timekeeping_forward_now();
xtime = timespec_add(xtime, *ts);
wall_to_monotonic = timespec_sub(wall_to_monotonic, *ts);
timekeeper.ntp_error = 0;
ntp_clear();
update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
timekeeper.mult);
write_sequnlock_irqrestore(&xtime_lock, flags);
/* signal hrtimers about time change */
clock_was_set();
return 0;
}
EXPORT_SYMBOL(timekeeping_inject_offset);
/**
* change_clocksource - Swaps clocksources if a new one is available
*