timekeeping: Store cycle_last value in timekeeper struct as well

For implementing a shadow timekeeper and a split calculation/update
region we need to store the cycle_last value in the timekeeper and
update the value in the clocksource struct only in the update region.

Add the extra storage to the timekeeper.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/timekeeper_internal.h b/include/linux/timekeeper_internal.h
index a151bd70e52b..c1825eb436ed 100644
--- a/include/linux/timekeeper_internal.h
+++ b/include/linux/timekeeper_internal.h
@@ -20,6 +20,8 @@ struct timekeeper {
         u32                     shift;
         /* Number of clock cycles in one NTP interval. */
         cycle_t                 cycle_interval;
+        /* Last cycle value (also stored in clock->cycle_last) */
+        cycle_t                 cycle_last;
         /* Number of clock shifted nano seconds in one NTP interval. */
         u64                     xtime_interval;
         /* shifted nano seconds left over when rounding cycle_interval */