[PATCH v2 3/3] rcutorture: Fix rcu_barrier successes counter

[Joel Fernandes]

From: "Joel Fernandes (Google)" <j...@joelfernandes.org>

rcutorture currently increments both successes and error for barrier
test incase of errors. It should only increment the error counter incase
of errors so make it do so.

Test: Introduced rcu_barrier errors by returning from the barrier
callback without incrementing the callback counter.

Signed-off-by: Joel Fernandes (Google) <j...@joelfernandes.org>
---
 kernel/rcu/rcutorture.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 2d1af5ffe536..b77012135ec0 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -169,7 +169,7 @@ static long n_rcu_torture_boost_failure;
 static long n_rcu_torture_boosts;
 static atomic_long_t n_rcu_torture_timers;
 static long n_barrier_attempts;
-static long n_barrier_successes;
+static long n_barrier_successes; /* did rcu_barrier test succeed? */
 static atomic_long_t n_cbfloods;
 static struct list_head rcu_torture_removed;
 
@@ -1722,8 +1722,9 @@ static int rcu_torture_barrier(void *arg)
                               atomic_read(&barrier_cbs_invoked),
                               n_barrier_cbs);
                        WARN_ON_ONCE(1);
+               } else {
+                       n_barrier_successes++;
                }
-               n_barrier_successes++;
                schedule_timeout_interruptible(HZ / 10);
        } while (!torture_must_stop());
        torture_kthread_stopping("rcu_torture_barrier");
-- 
2.18.0.rc1.244.gcf134e6275-goog