workqueue: Link pwq's into wq->pwqs from oldest to newest

Waiman-Long · htejun · commit 26fb7e3dda4c · 2024-02-08T09:22:30.000-10:00
Add a new pwq into the tail of wq-&gt;pwqs so that pwq iteration will
start from the oldest pwq to the newest. This ordering will facilitate
the inclusion of ordered workqueues in a wq_unbound_cpumask update.

Signed-off-by: Waiman Long &lt;longman@redhat.com&gt;
Signed-off-by: Tejun Heo &lt;tj@kernel.org&gt;
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
@@ -4804,7 +4804,7 @@ static void link_pwq(struct pool_workqueue *pwq)
 	pwq->work_color = wq->work_color;
 
 	/* link in @pwq */
-	list_add_rcu(&pwq->pwqs_node, &wq->pwqs);
+	list_add_tail_rcu(&pwq->pwqs_node, &wq->pwqs);
 }
 
 /* obtain a pool matching @attr and create a pwq associating the pool and @wq */

Original file line number	Diff line number	Diff line change
`@@ -4804,7 +4804,7 @@ static void link_pwq(struct pool_workqueue *pwq)`
`4804`	`4804`	`pwq->work_color = wq->work_color;`
`4805`	`4805`
`4806`	`4806`	`/* link in @pwq */`
`4807`		`- list_add_rcu(&pwq->pwqs_node, &wq->pwqs);`
	`4807`	`+ list_add_tail_rcu(&pwq->pwqs_node, &wq->pwqs);`
`4808`	`4808`	`}`
`4809`	`4809`
`4810`	`4810`	`/* obtain a pool matching @attr and create a pwq associating the pool and @wq */`