diff --git a/kernel/printk.c b/kernel/printk.c
index fccacf706f534d7971deb3827611f8e711ea4435..051d27e36a6c997e95215b90bfd3f50bfa7c9c08 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -486,6 +486,9 @@ static int have_callable_console(void)
  * @fmt: format string
  *
  * This is printk().  It can be called from any context.  We want it to work.
+ * Be aware of the fact that if oops_in_progress is not set, we might try to
+ * wake klogd up which could deadlock on runqueue lock if printk() is called
+ * from scheduler code.
  *
  * We try to grab the console_sem.  If we succeed, it's easy - we log the output and
  * call the console drivers.  If we fail to get the semaphore we place the output