The following commit has been merged into the sched/hrtick branch of tip:

Commit-ID:     7d27eafe54659d19cef10dab4520cbcdfb17b0e3
Gitweb:        https://git.kernel.org/tip/7d27eafe54659d19cef10dab4520cbcdfb17b0e3
Author:        Thomas Gleixner <tglx@kernel.org>
AuthorDate:    Tue, 24 Feb 2026 17:37:18 +01:00
Committer:     Peter Zijlstra <peterz@infradead.org>
CommitterDate: Fri, 27 Feb 2026 16:40:10 +01:00

hrtimer: Replace the bitfield in hrtimer_cpu_base

Use bool for the various flags as that creates better code in the hot path.

Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260224163430.475262618@kernel.org
---
 include/linux/hrtimer_defs.h | 10 +++++-----
 kernel/time/hrtimer.c        | 25 +++++++++++++------------
 2 files changed, 18 insertions(+), 17 deletions(-)

diff --git a/include/linux/hrtimer_defs.h b/include/linux/hrtimer_defs.h
index 02b010d..f9fbf9a 100644
--- a/include/linux/hrtimer_defs.h
+++ b/include/linux/hrtimer_defs.h
@@ -83,11 +83,11 @@ struct hrtimer_cpu_base {
 	unsigned int			cpu;
 	unsigned int			active_bases;
 	unsigned int			clock_was_set_seq;
-	unsigned int			hres_active		: 1,
-					in_hrtirq		: 1,
-					hang_detected		: 1,
-					softirq_activated       : 1,
-					online			: 1;
+	bool				hres_active;
+	bool				in_hrtirq;
+	bool				hang_detected;
+	bool				softirq_activated;
+	bool				online;
 #ifdef CONFIG_HIGH_RES_TIMERS
 	unsigned int			nr_events;
 	unsigned short			nr_retries;
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index e6f02e9..3b80a44 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -741,7 +741,7 @@ static void hrtimer_switch_to_hres(void)
 		pr_warn("Could not switch to high resolution mode on CPU %u\n",	base->cpu);
 		return;
 	}
-	base->hres_active = 1;
+	base->hres_active = true;
 	hrtimer_resolution = HIGH_RES_NSEC;
 
 	tick_setup_sched_timer(true);
@@ -1854,7 +1854,7 @@ static __latent_entropy void hrtimer_run_softirq(void)
 	now = hrtimer_update_base(cpu_base);
 	__hrtimer_run_queues(cpu_base, now, flags, HRTIMER_ACTIVE_SOFT);
 
-	cpu_base->softirq_activated = 0;
+	cpu_base->softirq_activated = false;
 	hrtimer_update_softirq_timer(cpu_base, true);
 
 	raw_spin_unlock_irqrestore(&cpu_base->lock, flags);
@@ -1881,7 +1881,7 @@ void hrtimer_interrupt(struct clock_event_device *dev)
 	raw_spin_lock_irqsave(&cpu_base->lock, flags);
 	entry_time = now = hrtimer_update_base(cpu_base);
 retry:
-	cpu_base->in_hrtirq = 1;
+	cpu_base->in_hrtirq = true;
 	/*
 	 * Set expires_next to KTIME_MAX, which prevents that remote CPUs queue
 	 * timers while __hrtimer_run_queues() is expiring the clock bases.
@@ -1892,7 +1892,7 @@ retry:
 
 	if (!ktime_before(now, cpu_base->softirq_expires_next)) {
 		cpu_base->softirq_expires_next = KTIME_MAX;
-		cpu_base->softirq_activated = 1;
+		cpu_base->softirq_activated = true;
 		raise_timer_softirq(HRTIMER_SOFTIRQ);
 	}
 
@@ -1905,12 +1905,12 @@ retry:
 	 * against it.
 	 */
 	cpu_base->expires_next = expires_next;
-	cpu_base->in_hrtirq = 0;
+	cpu_base->in_hrtirq = false;
 	raw_spin_unlock_irqrestore(&cpu_base->lock, flags);
 
 	/* Reprogramming necessary ? */
 	if (!tick_program_event(expires_next, 0)) {
-		cpu_base->hang_detected = 0;
+		cpu_base->hang_detected = false;
 		return;
 	}
 
@@ -1939,7 +1939,7 @@ retry:
 	 * time away.
 	 */
 	cpu_base->nr_hangs++;
-	cpu_base->hang_detected = 1;
+	cpu_base->hang_detected = true;
 	raw_spin_unlock_irqrestore(&cpu_base->lock, flags);
 
 	delta = ktime_sub(now, entry_time);
@@ -1987,7 +1987,7 @@ void hrtimer_run_queues(void)
 
 	if (!ktime_before(now, cpu_base->softirq_expires_next)) {
 		cpu_base->softirq_expires_next = KTIME_MAX;
-		cpu_base->softirq_activated = 1;
+		cpu_base->softirq_activated = true;
 		raise_timer_softirq(HRTIMER_SOFTIRQ);
 	}
 
@@ -2239,13 +2239,14 @@ int hrtimers_cpu_starting(unsigned int cpu)
 
 	/* Clear out any left over state from a CPU down operation */
 	cpu_base->active_bases = 0;
-	cpu_base->hres_active = 0;
-	cpu_base->hang_detected = 0;
+	cpu_base->hres_active = false;
+	cpu_base->hang_detected = false;
 	cpu_base->next_timer = NULL;
 	cpu_base->softirq_next_timer = NULL;
 	cpu_base->expires_next = KTIME_MAX;
 	cpu_base->softirq_expires_next = KTIME_MAX;
-	cpu_base->online = 1;
+	cpu_base->softirq_activated = false;
+	cpu_base->online = true;
 	return 0;
 }
 
@@ -2303,7 +2304,7 @@ int hrtimers_cpu_dying(unsigned int dying_cpu)
 	smp_call_function_single(ncpu, retrigger_next_event, NULL, 0);
 
 	raw_spin_unlock(&new_base->lock);
-	old_base->online = 0;
+	old_base->online = false;
 	raw_spin_unlock(&old_base->lock);
 
 	return 0;