linux-kernel - [PATCH 08/15] tick: Move tick cancellation up to CPUHP_AP_TICK

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Date: Wed, 24 Jan 2024 18:04:52 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Frederic Weisbecker <frederic@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Peng Liu <liupeng17@...ovo.com>,
	Joel Fernandes <joel@...lfernandes.org>
Subject: [PATCH 08/15] tick: Move tick cancellation up to CPUHP_AP_TICK_DYING

The tick hrtimer is cancelled right before hrtimers are migrated. This
is done from the hrtimer subsystem even though it shouldn't know about
its actual users.

Move instead the tick hrtimer cancellation to the relevant CPU hotplug
state that aims at centralizing high level tick shutdown operations so
that the related flow is easy to follow.

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
---
 kernel/time/hrtimer.c     | 2 --
 kernel/time/tick-common.c | 2 ++
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 355b5a957f7f..3b456ec7d4fb 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -2224,8 +2224,6 @@ int hrtimers_cpu_dying(unsigned int dying_cpu)
 	struct hrtimer_cpu_base *old_base, *new_base;
 	int i, ncpu = cpumask_first(cpu_active_mask);
 
-	tick_cancel_sched_timer(dying_cpu);
-
 	old_base = this_cpu_ptr(&hrtimer_bases);
 	new_base = &per_cpu(hrtimer_bases, ncpu);
 
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index a89ef450fda7..b4af8c743b73 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -410,6 +410,8 @@ int tick_cpu_dying(unsigned int dying_cpu)
 	if (tick_do_timer_cpu == dying_cpu)
 		tick_do_timer_cpu = cpumask_first(cpu_online_mask);
 
+	tick_cancel_sched_timer(dying_cpu);
+
 	return 0;
 }
 
-- 
2.43.0