rcu: Make rcu_torture_boost() exit loops at end of test

One of the loops in rcu_torture_boost() fails to check kthread_should_stop(),
and thus might be slowing or even stopping completion of rcutorture tests
at rmmod time.  This commit adds the kthread_should_stop() check to the
offending loop.

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

1 files changed, 2 insertions, 1 deletions

diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index 2431d576e9ca..764825c2685c 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -779,7 +779,8 @@ static int rcu_torture_boost(void *arg)
                  * interval.  Besides, we are running at RT priority,
                  * so delays should be relatively rare.
                  */
-                while (oldstarttime == boost_starttime) {
+                while (oldstarttime == boost_starttime &&
+                       !kthread_should_stop()) {
                         if (mutex_trylock(&boost_mutex)) {
                                 boost_starttime = jiffies +
                                                   test_boost_interval * HZ;