linux-kernel - [PATCH rcu v2 3/7] locking: Reduce the number of locks in ww

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Message-Id: <20230323042614.1191120-4-boqun.feng@gmail.com>
Date:   Wed, 22 Mar 2023 21:26:10 -0700
From:   Boqun Feng <boqun.feng@...il.com>
To:     rcu@...r.kernel.org
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Shuah Khan <shuah@...nel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        seanjc@...gle.com, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        kernel test robot <oliver.sang@...el.com>
Subject: [PATCH rcu v2 3/7] locking: Reduce the number of locks in ww_mutex stress tests

The stress test in test_ww_mutex_init() uses 4095 locks since
lockdep::reference has 12 bits, and since we are going to reduce it to
11 bits to support lock_sync(), and 2047 is still a reasonable number of
the max nesting level for locks, so adjust the test.

Reported-by: kernel test robot <oliver.sang@...el.com>
Link: https://lore.kernel.org/oe-lkp/202302011445.9d99dae2-oliver.sang@intel.com
Signed-off-by: Boqun Feng <boqun.feng@...il.com>
Tested-by: Paul E. McKenney <paulmck@...nel.org>
---
 kernel/locking/test-ww_mutex.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/locking/test-ww_mutex.c b/kernel/locking/test-ww_mutex.c
index 29dc253d03af..93cca6e69860 100644
--- a/kernel/locking/test-ww_mutex.c
+++ b/kernel/locking/test-ww_mutex.c
@@ -659,7 +659,7 @@ static int __init test_ww_mutex_init(void)
 	if (ret)
 		return ret;
 
-	ret = stress(4095, hweight32(STRESS_ALL)*ncpus, STRESS_ALL);
+	ret = stress(2047, hweight32(STRESS_ALL)*ncpus, STRESS_ALL);
 	if (ret)
 		return ret;
 
-- 
2.38.1