| Message ID | 20240620094300.YJlW043f@linutronix.de |
|---|---|
| State | New |
| Headers | show |
| Series | prinkt/nbcon: Add a scheduling point to nbcon_kthread_func(). | expand |
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);
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@redhat.com> Link: https://lore.kernel.org/ZnHF5j1DUDjN1kkq@debarbos-thinkpadt14sgen2i.remote.csb Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> --- kernel/printk/nbcon.c | 1 + 1 file changed, 1 insertion(+)