[tip: timers/core] hrtimer: Add a helper to retrieve a hrtimer from its timerqueue node

[tip-bot2 for Thomas Weißschuh (Schneider Electric)]

The following commit has been merged into the timers/core branch of tip:

Commit-ID:     88c316ff7694ddf55d5a0fe42602ae83bee560aa
Gitweb:        https://git.kernel.org/tip/88c316ff7694ddf55d5a0fe42602ae83bee560aa
Author:        Thomas Weißschuh (Schneider Electric) <thomas.weissschuh@xxxxxxxxxxxxx>
AuthorDate:    Wed, 11 Mar 2026 11:15:21 +01:00
Committer:     Thomas Gleixner <tglx@xxxxxxxxxx>
CommitterDate: Thu, 12 Mar 2026 12:15:56 +01:00

hrtimer: Add a helper to retrieve a hrtimer from its timerqueue node

The container_of() call is open-coded multiple times.

Add a helper macro.

Use container_of_const() to preserve constness.

Signed-off-by: Thomas Weißschuh (Schneider Electric) <thomas.weissschuh@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxx>
Link: https://patch.msgid.link/20260311-hrtimer-cleanups-v1-12-095357392669@xxxxxxxxxxxxx
---
 kernel/time/hrtimer.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index a71e2ca..2db171b 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -534,6 +534,8 @@ static inline void debug_activate(struct hrtimer *timer, enum hrtimer_mode mode,
 		for (bool done = false; !done; active &= ~(1U << idx))			\
 			for (base = &cpu_base->clock_base[idx]; !done; done = true)
 
+#define hrtimer_from_timerqueue_node(_n) container_of_const(_n, struct hrtimer, node)
+
 #if defined(CONFIG_NO_HZ_COMMON)
 /*
  * Same as hrtimer_bases_next_event() below, but skips the excluded timer and
@@ -578,7 +580,7 @@ static __always_inline struct hrtimer *clock_base_next_timer(struct hrtimer_cloc
 {
 	struct timerqueue_linked_node *next = timerqueue_linked_first(&base->active);
 
-	return container_of(next, struct hrtimer, node);
+	return hrtimer_from_timerqueue_node(next);
 }
 
 /* Find the base with the earliest expiry */
@@ -1960,7 +1962,7 @@ static __always_inline struct hrtimer *clock_base_next_timer_safe(struct hrtimer
 {
 	struct timerqueue_linked_node *next = timerqueue_linked_first(&base->active);
 
-	return next ? container_of(next, struct hrtimer, node) : NULL;
+	return next ? hrtimer_from_timerqueue_node(next) : NULL;
 }
 
 static void __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t now,
@@ -2439,7 +2441,7 @@ static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
 	struct hrtimer *timer;
 
 	while ((node = timerqueue_linked_first(&old_base->active))) {
-		timer = container_of(node, struct hrtimer, node);
+		timer = hrtimer_from_timerqueue_node(node);
 		BUG_ON(hrtimer_callback_running(timer));
 		debug_hrtimer_deactivate(timer);