The following commit has been merged into the sched/hrtick branch of tip:
Commit-ID: d19ff16c11db38f3ee179d72751fb9b340174330
Gitweb: https://git.kernel.org/tip/d19ff16c11db38f3ee179d72751fb9b340174330
Author: Peter Zijlstra <peterz@infradead.org>
AuthorDate: Tue, 24 Feb 2026 17:35:37 +01:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Fri, 27 Feb 2026 16:40:04 +01:00
hrtimer: Avoid pointless reprogramming in __hrtimer_start_range_ns()
Much like hrtimer_reprogram(), skip programming if the cpu_base is running
the hrtimer interrupt.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Juri Lelli <juri.lelli@redhat.com>
Reviewed-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260224163429.069535561@kernel.org
---
kernel/time/hrtimer.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 860af7a..3088db4 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -1269,6 +1269,14 @@ static int __hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
}
first = enqueue_hrtimer(timer, new_base, mode);
+
+ /*
+ * If the hrtimer interrupt is running, then it will reevaluate the
+ * clock bases and reprogram the clock event device.
+ */
+ if (new_base->cpu_base->in_hrtirq)
+ return false;
+
if (!force_local) {
/*
* If the current CPU base is online, then the timer is