linux-kernel - [PATCH v2] greybus: add WQ_PERCPU to alloc

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Message-ID: <20251112152710.207577-1-marco.crivellari@suse.com>
Date: Wed, 12 Nov 2025 16:27:10 +0100
From: Marco Crivellari <marco.crivellari@...e.com>
To: linux-kernel@...r.kernel.org,
	greybus-dev@...ts.linaro.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>,
	Johan Hovold <johan@...nel.org>,
	Alex Elder <elder@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH v2] greybus: 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")

This change adds a new WQ_PERCPU flag to explicitly request
alloc_workqueue() to be per-cpu when WQ_UNBOUND has not been specified.

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.

Once migration is complete, WQ_UNBOUND can be removed and unbound will
become the implicit default.

Suggested-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Marco Crivellari <marco.crivellari@...e.com>
Reviewed-by: Johan Hovold <johan@...nel.org>
---
Changes in v2:
- updated commit log removing two paragraph not strictly related to
  the work.

- subject changed removing "drivers/" before the actual prefix.
---
 drivers/greybus/operation.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/greybus/operation.c b/drivers/greybus/operation.c
index 54ccc434a1f7..7e12ffb2dd60 100644
--- a/drivers/greybus/operation.c
+++ b/drivers/greybus/operation.c
@@ -1238,7 +1238,7 @@ int __init gb_operation_init(void)
 		goto err_destroy_message_cache;
 
 	gb_operation_completion_wq = alloc_workqueue("greybus_completion",
-						     0, 0);
+						     WQ_PERCPU, 0);
 	if (!gb_operation_completion_wq)
 		goto err_destroy_operation_cache;
 
-- 
2.51.1