1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/timekeeper_internal.h b/include/linux/timekeeper_internal.h
index 7acb953298a7..84ff2844df2a 100644
--- a/include/linux/timekeeper_internal.h
+++ b/include/linux/timekeeper_internal.h
@@ -57,6 +57,7 @@ struct tk_read_base {
  * @cs_was_changed_seq: The sequence number of clocksource change events
  * @next_leap_ktime:    CLOCK_MONOTONIC time value of a pending leap-second
  * @raw_sec:            CLOCK_MONOTONIC_RAW  time in seconds
+ * @monotonic_to_boot:  CLOCK_MONOTONIC to CLOCK_BOOTTIME offset
  * @cycle_interval:     Number of clock cycles in one NTP interval
  * @xtime_interval:     Number of clock shifted nano seconds in one NTP
  *                      interval.
@@ -84,6 +85,9 @@ struct tk_read_base {
  *
  * wall_to_monotonic is no longer the boot time, getboottime must be
  * used instead.
+ *
+ * @monotonic_to_boottime is a timespec64 representation of @offs_boot to
+ * accelerate the VDSO update for CLOCK_BOOTTIME.
  */
 struct timekeeper {
         struct tk_read_base     tkr_mono;
@@ -99,6 +103,7 @@ struct timekeeper {
         u8                      cs_was_changed_seq;
         ktime_t                 next_leap_ktime;
         u64                     raw_sec;
+        struct timespec64       monotonic_to_boot;
 
         /* The following members are for timekeeping internal use */
         u64                     cycle_interval;