hrtimers: Add missing hrtimer_init() trace points

hrtimer_init*_on_stack() is not covered by tracing when
CONFIG_DEBUG_OBJECTS_TIMERS=y.

Rework the functions similar to hrtimer_init() and hrtimer_init_sleeper()
so that the hrtimer_init() tracepoint is unconditionally available.

The rework makes hrtimer_init_sleeper() unused. Delete it.

Signed-off-by: Nam Cao <namcao@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/74528e8abf2bb96e8bee85ffacbf14e15cf89f0d.1730386209.git.namcao@linutronix.de

Author: covanam

include/linux/hrtimer.h

@@ -228,32 +228,15 @@ static inline void hrtimer_cancel_wait_running(struct hrtimer *timer)
 /* Initialize timers: */
 extern void hrtimer_init(struct hrtimer *timer, clockid_t which_clock,
 			 enum hrtimer_mode mode);
-extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, clockid_t clock_id,
-				 enum hrtimer_mode mode);
-
-#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
 extern void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t which_clock,
 				  enum hrtimer_mode mode);
 extern void hrtimer_init_sleeper_on_stack(struct hrtimer_sleeper *sl,
 					  clockid_t clock_id,
 					  enum hrtimer_mode mode);
 
+#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
 extern void destroy_hrtimer_on_stack(struct hrtimer *timer);
 #else
-static inline void hrtimer_init_on_stack(struct hrtimer *timer,
-					 clockid_t which_clock,
-					 enum hrtimer_mode mode)
-{
-	hrtimer_init(timer, which_clock, mode);
-}
-
-static inline void hrtimer_init_sleeper_on_stack(struct hrtimer_sleeper *sl,
-						 clockid_t clock_id,
-						 enum hrtimer_mode mode)
-{
-	hrtimer_init_sleeper(sl, clock_id, mode);
-}
-
 static inline void destroy_hrtimer_on_stack(struct hrtimer *timer) { }
 #endif
 

kernel/time/hrtimer.c

@@ -417,6 +417,11 @@ static inline void debug_hrtimer_init(struct hrtimer *timer)
 	debug_object_init(timer, &hrtimer_debug_descr);
 }
 
+static inline void debug_hrtimer_init_on_stack(struct hrtimer *timer)
+{
+	debug_object_init_on_stack(timer, &hrtimer_debug_descr);
+}
+
 static inline void debug_hrtimer_activate(struct hrtimer *timer,
 					  enum hrtimer_mode mode)
 {
@@ -428,28 +433,6 @@ static inline void debug_hrtimer_deactivate(struct hrtimer *timer)
 	debug_object_deactivate(timer, &hrtimer_debug_descr);
 }
 
-static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
-			   enum hrtimer_mode mode);
-
-void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t clock_id,
-			   enum hrtimer_mode mode)
-{
-	debug_object_init_on_stack(timer, &hrtimer_debug_descr);
-	__hrtimer_init(timer, clock_id, mode);
-}
-EXPORT_SYMBOL_GPL(hrtimer_init_on_stack);
-
-static void __hrtimer_init_sleeper(struct hrtimer_sleeper *sl,
-				   clockid_t clock_id, enum hrtimer_mode mode);
-
-void hrtimer_init_sleeper_on_stack(struct hrtimer_sleeper *sl,
-				   clockid_t clock_id, enum hrtimer_mode mode)
-{
-	debug_object_init_on_stack(&sl->timer, &hrtimer_debug_descr);
-	__hrtimer_init_sleeper(sl, clock_id, mode);
-}
-EXPORT_SYMBOL_GPL(hrtimer_init_sleeper_on_stack);
-
 void destroy_hrtimer_on_stack(struct hrtimer *timer)
 {
 	debug_object_free(timer, &hrtimer_debug_descr);
@@ -459,6 +442,7 @@ EXPORT_SYMBOL_GPL(destroy_hrtimer_on_stack);
 #else
 
 static inline void debug_hrtimer_init(struct hrtimer *timer) { }
+static inline void debug_hrtimer_init_on_stack(struct hrtimer *timer) { }
 static inline void debug_hrtimer_activate(struct hrtimer *timer,
 					  enum hrtimer_mode mode) { }
 static inline void debug_hrtimer_deactivate(struct hrtimer *timer) { }
@@ -472,6 +456,13 @@ debug_init(struct hrtimer *timer, clockid_t clockid,
 	trace_hrtimer_init(timer, clockid, mode);
 }
 
+static inline void debug_init_on_stack(struct hrtimer *timer, clockid_t clockid,
+				       enum hrtimer_mode mode)
+{
+	debug_hrtimer_init_on_stack(timer);
+	trace_hrtimer_init(timer, clockid, mode);
+}
+
 static inline void debug_activate(struct hrtimer *timer,
 				  enum hrtimer_mode mode)
 {
@@ -1600,6 +1591,23 @@ void hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
 }
 EXPORT_SYMBOL_GPL(hrtimer_init);
 
+/**
+ * hrtimer_init_on_stack - initialize a timer in stack memory
+ * @timer:	The timer to be initialized
+ * @clock_id:	The clock to be used
+ * @mode:       The timer mode
+ *
+ * Similar to hrtimer_init(), except that this one must be used if struct hrtimer is in stack
+ * memory.
+ */
+void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t clock_id,
+			   enum hrtimer_mode mode)
+{
+	debug_init_on_stack(timer, clock_id, mode);
+	__hrtimer_init(timer, clock_id, mode);
+}
+EXPORT_SYMBOL_GPL(hrtimer_init_on_stack);
+
 /*
  * A timer is active, when it is enqueued into the rbtree or the
  * callback function is running or it's in the state of being migrated
@@ -1944,7 +1952,7 @@ void hrtimer_sleeper_start_expires(struct hrtimer_sleeper *sl,
 	 * Make the enqueue delivery mode check work on RT. If the sleeper
 	 * was initialized for hard interrupt delivery, force the mode bit.
 	 * This is a special case for hrtimer_sleepers because
-	 * hrtimer_init_sleeper() determines the delivery mode on RT so the
+	 * __hrtimer_init_sleeper() determines the delivery mode on RT so the
 	 * fiddling with this decision is avoided at the call sites.
 	 */
 	if (IS_ENABLED(CONFIG_PREEMPT_RT) && sl->timer.is_hard)
@@ -1987,19 +1995,18 @@ static void __hrtimer_init_sleeper(struct hrtimer_sleeper *sl,
 }
 
 /**
- * hrtimer_init_sleeper - initialize sleeper to the given clock
+ * hrtimer_init_sleeper_on_stack - initialize a sleeper in stack memory
  * @sl:		sleeper to be initialized
  * @clock_id:	the clock to be used
  * @mode:	timer mode abs/rel
  */
-void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, clockid_t clock_id,
-			  enum hrtimer_mode mode)
+void hrtimer_init_sleeper_on_stack(struct hrtimer_sleeper *sl,
+				   clockid_t clock_id, enum hrtimer_mode mode)
 {
-	debug_init(&sl->timer, clock_id, mode);
+	debug_init_on_stack(&sl->timer, clock_id, mode);
 	__hrtimer_init_sleeper(sl, clock_id, mode);
-
 }
-EXPORT_SYMBOL_GPL(hrtimer_init_sleeper);
+EXPORT_SYMBOL_GPL(hrtimer_init_sleeper_on_stack);
 
 int nanosleep_copyout(struct restart_block *restart, struct timespec64 *ts)
 {