linux-kernel - [PATCH v4 2/4] workqueue: Factorize unbind/rebind

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Date:   Tue,  4 Oct 2022 16:05:19 +0100
From:   Valentin Schneider <vschneid@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Tejun Heo <tj@...nel.org>, Lai Jiangshan <jiangshanlai@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Phil Auld <pauld@...hat.com>,
        Marcelo Tosatti <mtosatti@...hat.com>
Subject: [PATCH v4 2/4] workqueue: Factorize unbind/rebind_workers() logic

Later patches will reuse this code, move it into reusable functions.

Signed-off-by: Valentin Schneider <vschneid@...hat.com>
---
 kernel/workqueue.c | 33 +++++++++++++++++++++------------
 1 file changed, 21 insertions(+), 12 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 8e21c352c155..8185a42848c5 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1972,6 +1972,23 @@ static struct worker *create_worker(struct worker_pool *pool)
 	return NULL;
 }
 
+static void unbind_worker(struct worker *worker)
+{
+	lockdep_assert_held(&wq_pool_attach_mutex);
+
+	kthread_set_per_cpu(worker->task, -1);
+	if (cpumask_intersects(wq_unbound_cpumask, cpu_active_mask))
+		WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task, wq_unbound_cpumask) < 0);
+	else
+		WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task, cpu_possible_mask) < 0);
+}
+
+static void rebind_worker(struct worker *worker, struct worker_pool *pool)
+{
+	kthread_set_per_cpu(worker->task, pool->cpu);
+	WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task, pool->attrs->cpumask) < 0);
+}
+
 /**
  * destroy_worker - destroy a workqueue worker
  * @worker: worker to be destroyed
@@ -5008,13 +5025,8 @@ static void unbind_workers(int cpu)
 
 		raw_spin_unlock_irq(&pool->lock);
 
-		for_each_pool_worker(worker, pool) {
-			kthread_set_per_cpu(worker->task, -1);
-			if (cpumask_intersects(wq_unbound_cpumask, cpu_active_mask))
-				WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task, wq_unbound_cpumask) < 0);
-			else
-				WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task, cpu_possible_mask) < 0);
-		}
+		for_each_pool_worker(worker, pool)
+			unbind_worker(worker);
 
 		mutex_unlock(&wq_pool_attach_mutex);
 	}
@@ -5039,11 +5051,8 @@ static void rebind_workers(struct worker_pool *pool)
 	 * of all workers first and then clear UNBOUND.  As we're called
 	 * from CPU_ONLINE, the following shouldn't fail.
 	 */
-	for_each_pool_worker(worker, pool) {
-		kthread_set_per_cpu(worker->task, pool->cpu);
-		WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task,
-						  pool->attrs->cpumask) < 0);
-	}
+	for_each_pool_worker(worker, pool)
+		rebind_worker(worker, pool);
 
 	raw_spin_lock_irq(&pool->lock);
 
-- 
2.31.1