alarmtimer: Implement forward callback

Preparatory change to utilize the common posix timer mechanisms.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/20170530211657.513694229@linutronix.de

1 files changed, 13 insertions, 0 deletions

diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index be85e3cbfe1b..6082cf1af876 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -549,6 +549,18 @@ static void alarm_timer_rearm(struct k_itimer *timr)
 }
 
 /**
+ * alarm_timer_forward - Posix timer callback for forwarding timer
+ * @timr:       Pointer to the posixtimer data struct
+ * @now:        Current time to forward the timer against
+ */
+static int alarm_timer_forward(struct k_itimer *timr, ktime_t now)
+{
+        struct alarm *alarm = &timr->it.alarm.alarmtimer;
+
+        return (int) alarm_forward(alarm, timr->it_interval, now);
+}
+
+/**
  * alarm_clock_getres - posix getres interface
  * @which_clock: clockid
  * @tp: timespec to fill
@@ -876,6 +888,7 @@ const struct k_clock alarm_clock = {
         .timer_del      = alarm_timer_del,
         .timer_get      = alarm_timer_get,
         .timer_rearm    = alarm_timer_rearm,
+        .timer_forward  = alarm_timer_forward,
         .nsleep         = alarm_timer_nsleep,
 };
 #endif /* CONFIG_POSIX_TIMERS */