timekeeping: Move TAI managment into timekeeping core from ntp

Currently NTP manages the TAI offset. Since there's plans for a
CLOCK_TAI clockid, push the TAI management into the timekeeping
core.

CC: Thomas Gleixner <tglx@linutronix.de>
CC: Eric Dumazet <eric.dumazet@gmail.com>
CC: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>

2 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/time.h b/include/linux/time.h
index d4835dfdf25e..47210a175e78 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -181,6 +181,8 @@ extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
 extern int timekeeping_valid_for_hres(void);
 extern u64 timekeeping_max_deferment(void);
 extern int timekeeping_inject_offset(struct timespec *ts);
+extern s32 timekeeping_get_tai_offset(void);
+extern void timekeeping_set_tai_offset(s32 tai_offset);
 
 struct tms;
 extern void do_sys_times(struct tms *);
diff --git a/include/linux/timekeeper_internal.h b/include/linux/timekeeper_internal.h
index e1d558e237ec..ff94f436f8b7 100644
--- a/include/linux/timekeeper_internal.h
+++ b/include/linux/timekeeper_internal.h
@@ -62,6 +62,9 @@ struct timekeeper {
         ktime_t                 offs_boot;
         /* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */
         struct timespec         raw_time;
+        /* The current UTC to TAI offset in seconds */
+        s32                     tai_offset;
+
         /* Seqlock for all timekeeper values */
         seqlock_t               lock;
 };