linux-kernel - [PATCH] workqueue: Remove rcu_read_lock/unlock() in wq_watchdog_timer

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Message-Id: <20250904113133.24487-2-qiang.zhang@linux.dev>
Date: Thu,  4 Sep 2025 19:31:33 +0800
From: Zqiang <qiang.zhang@...ux.dev>
To: tj@...nel.org,
	jiangshanlai@...il.com
Cc: linux-kernel@...r.kernel.org,
	qiang.zhang@...ux.dev
Subject: [PATCH] workqueue: Remove rcu_read_lock/unlock() in wq_watchdog_timer_fn()

The wq_watchdog_timer_fn() is executed in the softirq context, this
is already in the RCU read critical section, this commit therefore
remove rcu_read_lock/unlock() in wq_watchdog_timer_fn().

Signed-off-by: Zqiang <qiang.zhang@...ux.dev>
---
 kernel/workqueue.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 831754e90071..63b2685c2cb4 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -7544,8 +7544,6 @@ static void wq_watchdog_timer_fn(struct timer_list *unused)
 	if (!thresh)
 		return;
 
-	rcu_read_lock();
-
 	for_each_pool(pool, pi) {
 		unsigned long pool_ts, touched, ts;
 
@@ -7587,8 +7585,6 @@ static void wq_watchdog_timer_fn(struct timer_list *unused)
 
 	}
 
-	rcu_read_unlock();
-
 	if (lockup_detected)
 		show_all_workqueues();
 
-- 
2.17.1