[PATCH 6/6] workqueue: install per-cpu pwqs at creation for __WQ_PERCPU_POOLS

[Breno Leitao <leitao@debian.org>]

alloc_and_link_pwqs() brings up an unbound workqueue with dedicated
unbound pools. For a workqueue that requests the per-cpu backend,
convert those pwqs to per-cpu-backed ones right after creation by
running the per-CPU update, so the backend is in place before the
workqueue is used rather than only after the first CPU hotplug event.

No workqueue sets __WQ_PERCPU_POOLS yet, so there is no functional
change.

Signed-off-by: Breno Leitao <leitao@debian.org>
---
 kernel/workqueue.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index df4fc9ccb7b22..cd3d0d54dfddc 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -5766,6 +5766,12 @@ static int alloc_and_link_pwqs(struct workqueue_struct *wq)
 
 	if (ret)
 		goto enomem;
+
+	if (wq->flags & __WQ_PERCPU_POOLS) {
+		for_each_possible_cpu(cpu)
+			unbound_wq_update_pwq(wq, cpu);
+	}
+
 	return 0;
 
 enomem:

-- 
2.53.0-Meta