Merge pull request torvalds#562 from ddiss/host_timer_drop_cb_arg

lkl: host: drop unused timer callback parameter

Author: tavip

arch/lkl/include/uapi/asm/host_ops.h

@@ -99,7 +99,7 @@ enum lkl_prot {
  * @page_alloc - allocate page aligned memory
  * @page_free - free memory allocated by page_alloc
  *
- * @timer_create - allocate a host timer that runs fn(arg) when the timer
+ * @timer_create - allocate a host timer that runs fn() when the timer
  * fires.
  * @timer_free - disarms and free the timer
  * @timer_set_oneshot - arm the timer to fire once, after delta ns.
@@ -169,7 +169,7 @@ struct lkl_host_operations {
 
 	unsigned long long (*time)(void);
 
-	void* (*timer_alloc)(void (*fn)(void *), void *arg);
+	void* (*timer_alloc)(void (*fn)(void));
 	int (*timer_set_oneshot)(void *timer, unsigned long delta);
 	void (*timer_free)(void *timer);
 

arch/lkl/kernel/time.c

@@ -65,7 +65,7 @@ static void *timer;
 
 static int timer_irq;
 
-static void timer_fn(void *arg)
+static void timer_fn(void)
 {
 	lkl_trigger_irq(timer_irq);
 }
@@ -82,7 +82,7 @@ static int clockevent_set_state_shutdown(struct clock_event_device *evt)
 
 static int clockevent_set_state_oneshot(struct clock_event_device *evt)
 {
-	timer = lkl_ops->timer_alloc(timer_fn, NULL);
+	timer = lkl_ops->timer_alloc(timer_fn);
 	if (!timer)
 		return -ENOMEM;
 

tools/lkl/lib/nt-host.c

@@ -178,11 +178,10 @@ static unsigned long long time_ns(void)
 
 struct timer {
 	HANDLE queue;
-	void (*callback)(void *);
-	void *arg;
+	void (*callback)(void);
 };
 
-static void *timer_alloc(void (*fn)(void *), void *arg)
+static void *timer_alloc(void (*fn)(void))
 {
 	struct timer *t;
 
@@ -197,7 +196,6 @@ static void *timer_alloc(void (*fn)(void *), void *arg)
 	}
 
 	t->callback = fn;
-	t->arg = arg;
 
 	return t;
 }
@@ -207,7 +205,7 @@ static void CALLBACK timer_callback(void *arg, BOOLEAN TimerOrWaitFired)
 	struct timer *t = (struct timer *)arg;
 
 	if (TimerOrWaitFired)
-		t->callback(t->arg);
+		t->callback();
 }
 
 static int timer_set_oneshot(void *timer, unsigned long ns)

tools/lkl/lib/posix-host.c

@@ -396,62 +396,50 @@ static unsigned long long time_ns(void)
 	return 1e9*ts.tv_sec + ts.tv_nsec;
 }
 
-struct lkl_timer {
-	timer_t timer;
-	void (*fn)(void *arg);
-	void *arg;
-};
-
 static void lkl_timer_callback(union sigval sv)
 {
-	struct lkl_timer *lt = (struct lkl_timer *)sv.sival_ptr;
+	void (*fn)(void) = sv.sival_ptr;
 
-	lt->fn(lt->arg);
+	fn();
 }
 
-static void *timer_alloc(void (*fn)(void *), void *arg)
+static void *timer_alloc(void (*fn)(void))
 {
 	int err;
+	timer_t timer;
 	struct sigevent se =  {
 		.sigev_notify = SIGEV_THREAD,
+		.sigev_value = {
+			.sival_ptr = fn,
+		},
 		.sigev_notify_function = lkl_timer_callback,
 	};
-	struct lkl_timer *pt;
-
 
-	pt = malloc(sizeof(*pt));
-	if (!pt)
-		return NULL;
-
-	pt->fn = fn;
-	pt->arg = arg;
-	se.sigev_value.sival_ptr = pt;
-	err = timer_create(CLOCK_REALTIME, &se, &pt->timer);
+	err = timer_create(CLOCK_REALTIME, &se, &timer);
 	if (err)
 		return NULL;
 
-	return pt;
+	return (void *)(long)timer;
 }
 
-static int timer_set_oneshot(void *timer, unsigned long ns)
+static int timer_set_oneshot(void *_timer, unsigned long ns)
 {
-	struct lkl_timer *lt = timer;
+	timer_t timer = (timer_t)(long)_timer;
 	struct itimerspec ts = {
 		.it_value = {
 			.tv_sec = ns / 1000000000,
 			.tv_nsec = ns % 1000000000,
 		},
 	};
 
-	return timer_settime(lt->timer, 0, &ts, NULL);
+	return timer_settime(timer, 0, &ts, NULL);
 }
 
-static void timer_free(void *timer)
+static void timer_free(void *_timer)
 {
-	struct lkl_timer *lt = timer;
+	timer_t timer = (timer_t)(long)_timer;
 
-	timer_delete(lt->timer);
-	free(lt);
+	timer_delete(timer);
 }
 
 static void panic(void)