rcu: Add comment to the last sleep in the rcu tasks loop

At the end of rcu_tasks_kthread() there's a lonely
schedule_timeout_uninterruptible() call with no apparent rationale for
its existence. But there is. It is to keep the thread from going into
a tight loop if there's some anomaly. That really needs a comment.

Link: http://lkml.kernel.org/r/20180524223839.GU3803@linux.vnet.ibm.com
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
index 4c7c49c..39cb23d 100644 (file)
--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
@@ -814,6 +814,7 @@ static int __noreturn rcu_tasks_kthread(void *arg)
                        list = next;
                        cond_resched();
                }
+               /* Paranoid sleep to keep this from entering a tight loop */
                schedule_timeout_uninterruptible(HZ/10);
        }
 }