alarmtimer: Implement try_to_cancel 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/20170530211657.670026824@linutronix.de

diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 02ddc40f19fe9ef59c839ed84214c6de6364be85..374bd855a48874ca697ef0b0463c5140b90da30b 100644 (file)
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -572,6 +572,15 @@ static ktime_t alarm_timer_remaining(struct k_itimer *timr, ktime_t now)
        return ktime_sub(now, alarm->node.expires);
 }
 
+/**
+ * alarm_timer_try_to_cancel - Posix timer callback to cancel a timer
+ * @timr:      Pointer to the posixtimer data struct
+ */
+static int alarm_timer_try_to_cancel(struct k_itimer *timr)
+{
+       return alarm_try_to_cancel(&timr->it.alarm.alarmtimer);
+}
+
 /**
  * alarm_clock_getres - posix getres interface
  * @which_clock: clockid
@@ -902,6 +911,7 @@ const struct k_clock alarm_clock = {
        .timer_rearm            = alarm_timer_rearm,
        .timer_forward          = alarm_timer_forward,
        .timer_remaining        = alarm_timer_remaining,
+       .timer_try_to_cancel    = alarm_timer_try_to_cancel,
        .nsleep                 = alarm_timer_nsleep,
 };
 #endif /* CONFIG_POSIX_TIMERS */