linux-kernel - [PATCH rcu 06/12] rcutorture: Make failure indication note reader-batch overflow

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Message-Id: <20220620225817.3843106-6-paulmck@kernel.org>
Date:   Mon, 20 Jun 2022 15:58:11 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com,
        rostedt@...dmis.org, "Paul E. McKenney" <paulmck@...nel.org>
Subject: [PATCH rcu 06/12] rcutorture: Make failure indication note reader-batch overflow

The loop scanning the pipesummary[] array currently skips the last
element, which means that the diagnostics ignore those rarest of
situations, namely where some readers persist across more than ten
grace periods, but all other readers avoid spanning a full grace period.
This commit therefore adjusts the scan to include the last element of
this array.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 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 613711b8242b9..64ad5305829b6 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1869,7 +1869,7 @@ rcu_torture_stats_print(void)
 			batchsummary[i] += READ_ONCE(per_cpu(rcu_torture_batch, cpu)[i]);
 		}
 	}
-	for (i = RCU_TORTURE_PIPE_LEN - 1; i >= 0; i--) {
+	for (i = RCU_TORTURE_PIPE_LEN; i >= 0; i--) {
 		if (pipesummary[i] != 0)
 			break;
 	}
-- 
2.31.1.189.g2e36527f23