Constant printing can lead to a CPU hog in nbcon_kthread_func(). The context is preemptible but on !PREEMPT kernels there is no explicit preemption point which leads softlockup warnings. Add an explicit preemption point in nbcon_kthread_func(). Reported-by: Derek Barbosa <debarbos@xxxxxxxxxx> Link: https://lore.kernel.org/ZnHF5j1DUDjN1kkq@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> --- kernel/printk/nbcon.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/printk/nbcon.c b/kernel/printk/nbcon.c index bb9689f94d302..0813ce88a49c5 100644 --- a/kernel/printk/nbcon.c +++ b/kernel/printk/nbcon.c @@ -1119,6 +1119,7 @@ static int nbcon_kthread_func(void *__console) } console_srcu_read_unlock(cookie); + cond_resched(); } while (backlog); -- 2.45.2
