linux-kernel - [PATCH] media: platform: Add WQ_PERCPU to alloc

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Message-ID: <20260113140446.196930-1-marco.crivellari@suse.com>
Date: Tue, 13 Jan 2026 15:04:46 +0100
From: Marco Crivellari <marco.crivellari@...e.com>
To: linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org
Cc: Tejun Heo <tj@...nel.org>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Frederic Weisbecker <frederic@...nel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Marco Crivellari <marco.crivellari@...e.com>,
	Michal Hocko <mhocko@...e.com>,
	Daniel Scally <dan.scally@...asonboard.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>
Subject: [PATCH] media: platform: Add WQ_PERCPU to alloc_workqueue users

This continues the effort to refactor workqueue APIs, which began with
the introduction of new workqueues and a new alloc_workqueue flag in:

   commit 128ea9f6ccfb ("workqueue: Add system_percpu_wq and system_dfl_wq")
   commit 930c2ea566af ("workqueue: Add new WQ_PERCPU flag")

The refactoring is going to alter the default behavior of
alloc_workqueue() to be unbound by default.

With the introduction of the WQ_PERCPU flag (equivalent to !WQ_UNBOUND),
any alloc_workqueue() caller that doesn’t explicitly specify WQ_UNBOUND
must now use WQ_PERCPU. For more details see the Link tag below.

In order to keep alloc_workqueue() behavior identical, explicitly request
WQ_PERCPU.

Link: https://lore.kernel.org/all/20250221112003.1dSuoGyc@linutronix.de/
Suggested-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Marco Crivellari <marco.crivellari@...e.com>
---
 drivers/media/platform/renesas/rzv2h-ivc/rzv2h-ivc-video.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/renesas/rzv2h-ivc/rzv2h-ivc-video.c b/drivers/media/platform/renesas/rzv2h-ivc/rzv2h-ivc-video.c
index 799453250b85..e3ff0482a84e 100644
--- a/drivers/media/platform/renesas/rzv2h-ivc/rzv2h-ivc-video.c
+++ b/drivers/media/platform/renesas/rzv2h-ivc/rzv2h-ivc-video.c
@@ -445,7 +445,7 @@ int rzv2h_ivc_init_vdev(struct rzv2h_ivc *ivc, struct v4l2_device *v4l2_dev)
 	INIT_LIST_HEAD(&ivc->buffers.queue);
 	INIT_WORK(&ivc->buffers.work, rzv2h_ivc_transfer_buffer);
 
-	ivc->buffers.async_wq = alloc_workqueue("rzv2h-ivc", 0, 0);
+	ivc->buffers.async_wq = alloc_workqueue("rzv2h-ivc", WQ_PERCPU, 0);
 	if (!ivc->buffers.async_wq)
 		return -EINVAL;
 
-- 
2.52.0