linux-kernel - [PATCH] workqueue: Initialize wq_isolated_cpumask in workqueue_init

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Message-Id: <20250617044216.1401878-1-zhouchuyi@bytedance.com>
Date: Tue, 17 Jun 2025 12:42:16 +0800
From: Chuyi Zhou <zhouchuyi@...edance.com>
To: longman@...hat.com,
	tj@...nel.org,
	jiangshanlai@...il.com
Cc: linux-kernel@...r.kernel.org,
	Chuyi Zhou <zhouchuyi@...edance.com>
Subject: [PATCH] workqueue: Initialize wq_isolated_cpumask in workqueue_init_early()

Now when isolcpus is enabled via the cmdline, wq_isolated_cpumask does
not include these isolated CPUs, even wq_unbound_cpumask has already
excluded them. It is only when we successfully configure an isolate cpuset
partition that wq_isolated_cpumask gets overwritten by
workqueue_unbound_exclude_cpumask(), including both the cmdline-specified
isolated CPUs and the isolated CPUs within the cpuset partitions.

Fix this issue by initializing wq_isolated_cpumask properly in
workqueue_init_early().

Fixes: fe28f631fa94 ("workqueue: Add workqueue_unbound_exclude_cpumask() to exclude CPUs from wq_unbound_cpumask")
Signed-off-by: Chuyi Zhou <zhouchuyi@...edance.com>
---
 kernel/workqueue.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 97f37b5bae669..9f91480758288 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -7767,7 +7767,8 @@ void __init workqueue_init_early(void)
 		restrict_unbound_cpumask("workqueue.unbound_cpus", &wq_cmdline_cpumask);
 
 	cpumask_copy(wq_requested_unbound_cpumask, wq_unbound_cpumask);
-
+	cpumask_andnot(wq_isolated_cpumask, cpu_possible_mask,
+						housekeeping_cpumask(HK_TYPE_DOMAIN));
 	pwq_cache = KMEM_CACHE(pool_workqueue, SLAB_PANIC);
 
 	unbound_wq_update_pwq_attrs_buf = alloc_workqueue_attrs();
-- 
2.20.1