alarmtimer: Update kerneldoc

Update kerneldoc comments to reflect the actual arguments and return values
of the documented functions.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210202013457.3482388-1-alexandre.belloni@bootlin.com

kernel/time/alarmtimer.c

@@ -527,8 +527,11 @@ static enum alarmtimer_type clock2alarm(clockid_t clockid)
 /**
  * alarm_handle_timer - Callback for posix timers
  * @alarm: alarm that fired
+ * @now: time at the timer expiration
  *
  * Posix timer callback for expired alarm timers.
+ *
+ * Return: whether the timer is to be restarted
  */
 static enum alarmtimer_restart alarm_handle_timer(struct alarm *alarm,
 							ktime_t now)
@@ -715,8 +718,11 @@ static int alarm_timer_create(struct k_itimer *new_timer)
 /**
  * alarmtimer_nsleep_wakeup - Wakeup function for alarm_timer_nsleep
  * @alarm: ptr to alarm that fired
+ * @now: time at the timer expiration
  *
  * Wakes up the task that set the alarmtimer
+ *
+ * Return: ALARMTIMER_NORESTART
  */
 static enum alarmtimer_restart alarmtimer_nsleep_wakeup(struct alarm *alarm,
 								ktime_t now)
@@ -733,6 +739,7 @@ static enum alarmtimer_restart alarmtimer_nsleep_wakeup(struct alarm *alarm,
  * alarmtimer_do_nsleep - Internal alarmtimer nsleep implementation
  * @alarm: ptr to alarmtimer
  * @absexp: absolute expiration time
+ * @type: alarm type (BOOTTIME/REALTIME).
  *
  * Sets the alarm timer and sleeps until it is fired or interrupted.
  */
@@ -806,7 +813,6 @@ static long __sched alarm_timer_nsleep_restart(struct restart_block *restart)
  * @which_clock: clockid
  * @flags: determins abstime or relative
  * @tsreq: requested sleep time (abs or rel)
- * @rmtp: remaining sleep time saved
  *
  * Handles clock_nanosleep calls against _ALARM clockids
  */