Commit 49d78adf authored by Tejun Heo's avatar Tejun Heo
Browse files

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: default avatarTejun Heo <tj@kernel.org>
Reviewed-by: default avatarZhao Mengmeng <zhaomengmeng@kylinos.cn>
parent e719e17d

kernel/sched/ext.c

+2 −3
Original line number Diff line number Diff line
@@ -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;