From ccd15eb0a7f79df80628f92bff1f684a276091e1 Mon Sep 17 00:00:00 2001
From: "Paul E. McKenney" <paulmck@kernel.org>
Date: Tue, 3 Aug 2021 17:42:25 -0700
Subject: [PATCH] rcutorture: Suppressing read-exit testing is not an error

References: bnc#1189998 (PREEMPT_RT prerequisite backports)
Patch-mainline: v5.16-rc1
Git-commit: fda84866b1e68ab409074e7fcf1a7db800615445

Currently, specifying the rcutorture.read_exit_burst=0 kernel boot
parameter will result in a -EINVAL exit code that will stop the rcutorture
test run before it has fully initialized.  This commit therefore uses a
zero exit code in that case, thus allowing rcutorture.read_exit_burst=0
to complete normally.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Mel Gorman <mgorman@suse.de>
---
 kernel/rcu/rcutorture.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 4b012e1b6aa8..0a4694b79547 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -2765,7 +2765,7 @@ static int rcu_torture_read_exit(void *unused)
 static int rcu_torture_read_exit_init(void)
 {
 	if (read_exit_burst <= 0)
-		return -EINVAL;
+		return 0;
 	init_waitqueue_head(&read_exit_wq);
 	read_exit_child_stop = false;
 	read_exit_child_stopped = false;