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

diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index be85e3cbfe1b02b79dcc00789f7e171c83329958..6082cf1af876ada09329ad8bf16adb4c34b640f0 100644 (file)
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -548,6 +548,18 @@ static void alarm_timer_rearm(struct k_itimer *timr)
        alarm_start(alarm, alarm->node.expires);
 }
 
+/**
+ * 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
@@ -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 */