linux-kernel - [PATCH -tip V3 6/8] workqueue: reorganize workqueue_online

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Date:   Sat, 26 Dec 2020 10:51:14 +0800
From:   Lai Jiangshan <jiangshanlai@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Valentin Schneider <valentin.schneider@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Qian Cai <cai@...hat.com>,
        Vincent Donnefort <vincent.donnefort@....com>,
        Dexuan Cui <decui@...rosoft.com>,
        Lai Jiangshan <laijs@...ux.alibaba.com>,
        Tejun Heo <tj@...nel.org>,
        Lai Jiangshan <jiangshanlai@...il.com>
Subject: [PATCH -tip V3 6/8] workqueue: reorganize workqueue_online_cpu()

From: Lai Jiangshan <laijs@...ux.alibaba.com>

Just move around the code, no functionality changed.

It prepares for later patch protecting wq_online_cpumask
in wq_pool_attach_mutex.

Acked-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Lai Jiangshan <laijs@...ux.alibaba.com>
---
 kernel/workqueue.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 79cc87df0cda..94545e6feda5 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -5088,12 +5088,17 @@ int workqueue_online_cpu(unsigned int cpu)
 	mutex_lock(&wq_pool_mutex);
 	cpumask_set_cpu(cpu, wq_online_cpumask);
 
+	for_each_cpu_worker_pool(pool, cpu) {
+		mutex_lock(&wq_pool_attach_mutex);
+		rebind_workers(pool);
+		mutex_unlock(&wq_pool_attach_mutex);
+	}
+
+	/* update CPU affinity of workers of unbound pools */
 	for_each_pool(pool, pi) {
 		mutex_lock(&wq_pool_attach_mutex);
 
-		if (pool->cpu == cpu)
-			rebind_workers(pool);
-		else if (pool->cpu < 0)
+		if (pool->cpu < 0)
 			update_unbound_workers_cpumask(pool, true, cpu);
 
 		mutex_unlock(&wq_pool_attach_mutex);
-- 
2.19.1.6.gb485710b