alarmtimer: Implement arm 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/20170530211657.747567162@linutronix.de

diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 374bd855a48874ca697ef0b0463c5140b90da30b..c618a44bb0547bb5b19027d51d94ac57a56f0653 100644 (file)
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -581,6 +581,27 @@ static int alarm_timer_try_to_cancel(struct k_itimer *timr)
        return alarm_try_to_cancel(&timr->it.alarm.alarmtimer);
 }
 
+/**
+ * alarm_timer_arm - Posix timer callback to arm a timer
+ * @timr:      Pointer to the posixtimer data struct
+ * @expires:   The new expiry time
+ * @absolute:  Expiry value is absolute time
+ * @sigev_none:        Posix timer does not deliver signals
+ */
+static void alarm_timer_arm(struct k_itimer *timr, ktime_t expires,
+                           bool absolute, bool sigev_none)
+{
+       struct alarm *alarm = &timr->it.alarm.alarmtimer;
+       struct alarm_base *base = &alarm_bases[alarm->type];
+
+       if (!absolute)
+               expires = ktime_add_safe(expires, base->gettime());
+       if (sigev_none)
+               alarm->node.expires = expires;
+       else
+               alarm_start(&timr->it.alarm.alarmtimer, expires);
+}
+
 /**
  * alarm_clock_getres - posix getres interface
  * @which_clock: clockid
@@ -908,6 +929,7 @@ const struct k_clock alarm_clock = {
        .timer_set              = alarm_timer_set,
        .timer_del              = alarm_timer_del,
        .timer_get              = alarm_timer_get,
+       .timer_arm              = alarm_timer_arm,
        .timer_rearm            = alarm_timer_rearm,
        .timer_forward          = alarm_timer_forward,
        .timer_remaining        = alarm_timer_remaining,