From: Tejun Heo <tj@kernel.org>
Date: Fri, 10 Apr 2026 20:19:22 +0000 (-1000)
Subject: sched_ext: Drop spurious warning on kick during scheduler disable
X-Git-Tag: v7.1-rc1~162^2~3
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=49d78adf9555bbc02ccb65a28325e3e57e9c52ed;p=thirdparty%2Flinux.git

sched_ext: Drop spurious warning on kick during scheduler disable

kick_cpus_irq_workfn() warns when scx_kick_syncs is NULL, but this can
legitimately happen when a BPF timer or other kick source races with
free_kick_syncs() during scheduler disable. Drop the pr_warn_once() and
add a comment explaining the race.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Zhao Mengmeng <zhaomengmeng@kylinos.cn>
---

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index b8dbae251fd58..012ca8bd70fbd 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -7600,10 +7600,9 @@ static void kick_cpus_irq_workfn(struct irq_work *irq_work)
 	unsigned long *ksyncs;
 	s32 cpu;
 
-	if (unlikely(!ksyncs_pcpu)) {
-		pr_warn_once("kick_cpus_irq_workfn() called with NULL scx_kick_syncs");
+	/* can race with free_kick_syncs() during scheduler disable */
+	if (unlikely(!ksyncs_pcpu))
 		return;
-	}
 
 	ksyncs = rcu_dereference_bh(ksyncs_pcpu)->syncs;