linux-kernel - [PATCH v2 3/3] rcutorture: Fix rcu

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Message-Id: <20180619221419.41340-3-joel@joelfernandes.org>
Date:   Tue, 19 Jun 2018 15:14:19 -0700
From:   Joel Fernandes <joel@...lfernandes.org>
To:     linux-kernel@...r.kernel.org
Cc:     kernel-team@...roid.com,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Byungchul Park <byungchul.park@....com>,
        Josh Triplett <josh@...htriplett.org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        peterz@...radead.org, Steven Rostedt <rostedt@...dmis.org>
Subject: [PATCH v2 3/3] rcutorture: Fix rcu_barrier successes counter

From: "Joel Fernandes (Google)" <joel@...lfernandes.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) <joel@...lfernandes.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