linux-kernel - [PATCH 02/10] workqueue: use cpu_possible_mask instead of cpu_active

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Message-Id: <20201214155457.3430-3-jiangshanlai@gmail.com>
Date:   Mon, 14 Dec 2020 23:54:49 +0800
From:   Lai Jiangshan <jiangshanlai@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Lai Jiangshan <laijs@...ux.alibaba.com>, Tejun Heo <tj@...nel.org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>
Subject: [PATCH 02/10] workqueue: use cpu_possible_mask instead of cpu_active_mask to break affinity

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

There might be other CPU online. The workers losing binding on its CPU
should have chance to work on those later onlined CPUs.

Fixes: 06249738a41a ("workqueue: Manually break affinity on hotplug")
Signed-off-by: Lai Jiangshan <laijs@...ux.alibaba.com>
---
 kernel/workqueue.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index aba71ab359dd..1f5b8385c0cf 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4909,8 +4909,9 @@ static void unbind_workers(int cpu)
 
 		raw_spin_unlock_irq(&pool->lock);
 
+		/* don't rely on the scheduler to force break affinity for us. */
 		for_each_pool_worker(worker, pool)
-			WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task, cpu_active_mask) < 0);
+			WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task, cpu_possible_mask) < 0);
 
 		mutex_unlock(&wq_pool_attach_mutex);
 
-- 
2.19.1.6.gb485710b