linux-kernel - [PATCH] workqueue: Create kworker only for boot CPU pool prior SMP initialization

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Message-Id: <20220331131435.2864347-1-qiang1.zhang@intel.com>
Date:   Thu, 31 Mar 2022 21:14:35 +0800
From:   Zqiang <qiang1.zhang@...el.com>
To:     tj@...nel.org, jiangshanlai@...il.com
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] workqueue: Create kworker only for boot CPU pool prior SMP initialization

The workqueue_init() is called before SMP initialization, which
means only the boot CPU is online, just create kworker for boot
CPU pool.

Signed-off-by: Zqiang <qiang1.zhang@...el.com>
---
 kernel/workqueue.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index abcc9a2ac319..3948babe02d5 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -6120,11 +6120,9 @@ void __init workqueue_init(void)
 	mutex_unlock(&wq_pool_mutex);
 
 	/* create the initial workers */
-	for_each_online_cpu(cpu) {
-		for_each_cpu_worker_pool(pool, cpu) {
-			pool->flags &= ~POOL_DISASSOCIATED;
-			BUG_ON(!create_worker(pool));
-		}
+	for_each_cpu_worker_pool(pool, smp_processor_id()) {
+		pool->flags &= ~POOL_DISASSOCIATED;
+		BUG_ON(!create_worker(pool));
 	}
 
 	hash_for_each(unbound_pool_hash, bkt, pool, hash_node)
-- 
2.25.1