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Fri, 07 Nov 2025 07:37:47 -0800 (PST) Received: from localhost.localdomain ([2a00:6d43:105:c401:e307:1a37:2e76:ce91]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-42ac67845ccsm5763460f8f.36.2025.11.07.07.37.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 07 Nov 2025 07:37:46 -0800 (PST) From: Marco Crivellari To: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org Cc: Tejun Heo , Lai Jiangshan , Frederic Weisbecker , Sebastian Andrzej Siewior , Marco Crivellari , Michal Hocko , Greg Kroah-Hartman , Heikki Krogerus Subject: [PATCH 2/2] usb: typec: anx7411: add WQ_PERCPU to alloc_workqueue users Date: Fri, 7 Nov 2025 16:37:31 +0100 Message-ID: <20251107153737.301413-3-marco.crivellari@suse.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251107153737.301413-1-marco.crivellari@suse.com> References: <20251107153737.301413-1-marco.crivellari@suse.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Currently if a user enqueues a work item using schedule_delayed_work() the used wq is "system_wq" (per-cpu wq) while queue_delayed_work() use WORK_CPU_UNBOUND (used when a cpu is not specified). The same applies to schedule_work() that is using system_wq and queue_work(), that makes use again of WORK_CPU_UNBOUND. This lack of consistency cannot be addressed without refactoring the API. alloc_workqueue() treats all queues as per-CPU by default, while unbound workqueues must opt-in via WQ_UNBOUND. This default is suboptimal: most workloads benefit from unbound queues, allowing the scheduler to place worker threads where they=E2=80=99re needed= and reducing noise when CPUs are isolated. 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=E2=80=99t explicitly specify WQ_UNB= OUND must now use WQ_PERCPU. Once migration is complete, WQ_UNBOUND can be removed and unbound will become the implicit default. Cc: Heikki Krogerus Suggested-by: Tejun Heo Signed-off-by: Marco Crivellari Reviewed-by: Heikki Krogerus --- drivers/usb/typec/anx7411.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/usb/typec/anx7411.c b/drivers/usb/typec/anx7411.c index 0ae0a5ee3fae..2e8ae1d2faf9 100644 --- a/drivers/usb/typec/anx7411.c +++ b/drivers/usb/typec/anx7411.c @@ -1516,8 +1516,7 @@ static int anx7411_i2c_probe(struct i2c_client *clien= t) =20 INIT_WORK(&plat->work, anx7411_work_func); plat->workqueue =3D alloc_workqueue("anx7411_work", - WQ_FREEZABLE | - WQ_MEM_RECLAIM, + WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_PERCPU, 1); if (!plat->workqueue) { dev_err(dev, "fail to create work queue\n"); --=20 2.51.1