linux-kernel - [PATCH V2] rcu/torture replace wait_event with wait_event

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Message-Id: <1682985701-19914-1-git-send-email-zhouzhouyi@gmail.com>
Date:   Tue,  2 May 2023 08:01:41 +0800
From:   zhouzhouyi@...il.com
To:     paulmck@...nel.org, rcu@...r.kernel.org,
        linux-kernel@...r.kernel.org, lance@...osl.org
Cc:     Zhouyi Zhou <zhouzhouyi@...il.com>
Subject: [PATCH V2] rcu/torture replace wait_event with wait_event_idle

From: Zhouyi Zhou <zhouzhouyi@...il.com>

In kfree_rcu_test, kfree_scale_shutdown will be detected as hung task
if kfree_loops is too big. Replace wait_event with wait_event_idle
to avoid false positive.

Tested in the PPC VM of Open Source Lab of Oregon State University.

Suggested-by: Paul E. McKenney <paulmck@...nel.org>    
Signed-off-by: Zhouyi Zhou <zhouzhouyi@...il.com>                    
---
 kernel/rcu/rcuscale.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcu/rcuscale.c b/kernel/rcu/rcuscale.c
index 91fb5905a008..d99c586939d1 100644
--- a/kernel/rcu/rcuscale.c
+++ b/kernel/rcu/rcuscale.c
@@ -771,7 +771,7 @@ kfree_scale_cleanup(void)
 static int
 kfree_scale_shutdown(void *arg)
 {
-	wait_event(shutdown_wq,
+	wait_event_idle(shutdown_wq,
 		   atomic_read(&n_kfree_scale_thread_ended) >= kfree_nrealthreads);
 
 	smp_mb(); /* Wake before output. */
-- 
2.34.1