linux-kernel - [PATCH] workqueue: set the rescuer worker that belong to freezable wq is freezable

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Date:   Tue, 22 Jun 2021 15:08:59 +0800
From:   qiang.zhang@...driver.com
To:     jiangshanlai@...il.com, tj@...nel.org, akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] workqueue: set the rescuer worker that belong to freezable wq is freezable

From: Zqiang <qiang.zhang@...driver.com>

If the rescuer worker belong to freezable wq, when this wq is
frozen, the rescuer also need to be frozen.

Signed-off-by: Zqiang <qiang.zhang@...driver.com>
---
 kernel/workqueue.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 104e3ef04e33..ccd6ee8f3dc6 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -2476,6 +2476,9 @@ static int rescuer_thread(void *__rescuer)
 	 * doesn't participate in concurrency management.
 	 */
 	set_pf_worker(true);
+
+	if (wq->flags & WQ_FREEZABLE)
+		set_freezable();
 repeat:
 	set_current_state(TASK_IDLE);
 
@@ -2504,6 +2507,9 @@ static int rescuer_thread(void *__rescuer)
 
 		raw_spin_unlock_irq(&wq_mayday_lock);
 
+		if (!kthread_should_stop())
+			try_to_freeze();
+
 		worker_attach_to_pool(rescuer, pool);
 
 		raw_spin_lock_irq(&pool->lock);
-- 
2.17.1