rcutorture: Bounds-check rcutorture.shuffle_interval

Specifying a negative rcutorture.shuffle_interval value will cause a
negative value to be used as a sleep time.  This commit therefore
refuses to start shuffling unless the rcutorture.shuffle_interval
value is greater than zero.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 2cbe569ac5dd08a93b5e570008819fb1c18bd86f..1cead7806ca607233b4f95dd2771016251ee78e4 100644 (file)
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1821,7 +1821,7 @@ rcu_torture_init(void)
                if (firsterr)
                        goto unwind;
        }
-       if (test_no_idle_hz) {
+       if (test_no_idle_hz && shuffle_interval > 0) {
                firsterr = torture_shuffle_init(shuffle_interval * HZ);
                if (firsterr)
                        goto unwind;