alarmtimers: Remove return value from alarm functions

Now that the SIG_IGN problem is solved in the core code, the alarmtimer
callbacks do not require a return value anymore.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/all/20241105064214.318837272@linutronix.de

Author: KAGA-KOKO

drivers/power/supply/charger-manager.c

@@ -1412,10 +1412,9 @@ static inline struct charger_desc *cm_get_drv_data(struct platform_device *pdev)
 	return dev_get_platdata(&pdev->dev);
 }
 
-static enum alarmtimer_restart cm_timer_func(struct alarm *alarm, ktime_t now)
+static void cm_timer_func(struct alarm *alarm, ktime_t now)
 {
 	cm_timer_set = false;
-	return ALARMTIMER_NORESTART;
 }
 
 static int charger_manager_probe(struct platform_device *pdev)

fs/timerfd.c

@@ -79,13 +79,11 @@ static enum hrtimer_restart timerfd_tmrproc(struct hrtimer *htmr)
 	return HRTIMER_NORESTART;
 }
 
-static enum alarmtimer_restart timerfd_alarmproc(struct alarm *alarm,
-	ktime_t now)
+static void timerfd_alarmproc(struct alarm *alarm, ktime_t now)
 {
 	struct timerfd_ctx *ctx = container_of(alarm, struct timerfd_ctx,
 					       t.alarm);
 	timerfd_triggered(ctx);
-	return ALARMTIMER_NORESTART;
 }
 
 /*

include/linux/alarmtimer.h

@@ -20,12 +20,6 @@ enum alarmtimer_type {
 	ALARM_BOOTTIME_FREEZER,
 };
 
-enum alarmtimer_restart {
-	ALARMTIMER_NORESTART,
-	ALARMTIMER_RESTART,
-};
-
-
 #define ALARMTIMER_STATE_INACTIVE	0x00
 #define ALARMTIMER_STATE_ENQUEUED	0x01
 
@@ -42,14 +36,14 @@ enum alarmtimer_restart {
 struct alarm {
 	struct timerqueue_node	node;
 	struct hrtimer		timer;
-	enum alarmtimer_restart	(*function)(struct alarm *, ktime_t now);
+	void			(*function)(struct alarm *, ktime_t now);
 	enum alarmtimer_type	type;
 	int			state;
 	void			*data;
 };
 
 void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
-		enum alarmtimer_restart (*function)(struct alarm *, ktime_t));
+		void (*function)(struct alarm *, ktime_t));
 void alarm_start(struct alarm *alarm, ktime_t start);
 void alarm_start_relative(struct alarm *alarm, ktime_t start);
 void alarm_restart(struct alarm *alarm);

kernel/time/alarmtimer.c

@@ -321,7 +321,7 @@ static int alarmtimer_resume(struct device *dev)
 
 static void
 __alarm_init(struct alarm *alarm, enum alarmtimer_type type,
-	     enum alarmtimer_restart (*function)(struct alarm *, ktime_t))
+	     void (*function)(struct alarm *, ktime_t))
 {
 	timerqueue_init(&alarm->node);
 	alarm->timer.function = alarmtimer_fired;
@@ -337,7 +337,7 @@ __alarm_init(struct alarm *alarm, enum alarmtimer_type type,
  * @function: callback that is run when the alarm fires
  */
 void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
-		enum alarmtimer_restart (*function)(struct alarm *, ktime_t))
+		void (*function)(struct alarm *, ktime_t))
 {
 	hrtimer_init(&alarm->timer, alarm_bases[type].base_clockid,
 		     HRTIMER_MODE_ABS);
@@ -530,14 +530,12 @@ static enum alarmtimer_type clock2alarm(clockid_t clockid)
  *
  * Return: whether the timer is to be restarted
  */
-static enum alarmtimer_restart alarm_handle_timer(struct alarm *alarm, ktime_t now)
+static void alarm_handle_timer(struct alarm *alarm, ktime_t now)
 {
 	struct k_itimer *ptr = container_of(alarm, struct k_itimer, it.alarm.alarmtimer);
 
 	guard(spinlock_irqsave)(&ptr->it_lock);
 	posix_timer_queue_signal(ptr);
-
-	return ALARMTIMER_NORESTART;
 }
 
 /**
@@ -698,18 +696,14 @@ static int alarm_timer_create(struct k_itimer *new_timer)
  * @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)
+static void alarmtimer_nsleep_wakeup(struct alarm *alarm, ktime_t now)
 {
 	struct task_struct *task = alarm->data;
 
 	alarm->data = NULL;
 	if (task)
 		wake_up_process(task);
-	return ALARMTIMER_NORESTART;
 }
 
 /**
@@ -761,7 +755,7 @@ static int alarmtimer_do_nsleep(struct alarm *alarm, ktime_t absexp,
 
 static void
 alarm_init_on_stack(struct alarm *alarm, enum alarmtimer_type type,
-		    enum alarmtimer_restart (*function)(struct alarm *, ktime_t))
+		    void (*function)(struct alarm *, ktime_t))
 {
 	hrtimer_init_on_stack(&alarm->timer, alarm_bases[type].base_clockid,
 			      HRTIMER_MODE_ABS);

net/netfilter/xt_IDLETIMER.c

@@ -107,14 +107,12 @@ static void idletimer_tg_expired(struct timer_list *t)
 	schedule_work(&timer->work);
 }
 
-static enum alarmtimer_restart idletimer_tg_alarmproc(struct alarm *alarm,
-							  ktime_t now)
+static void idletimer_tg_alarmproc(struct alarm *alarm, ktime_t now)
 {
 	struct idletimer_tg *timer = alarm->data;
 
 	pr_debug("alarm %s expired\n", timer->attr.attr.name);
 	schedule_work(&timer->work);
-	return ALARMTIMER_NORESTART;
 }
 
 static int idletimer_check_sysfs_name(const char *name, unsigned int size)