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Thu, 13 Nov 2025 08:12:57 -0800 (PST) Received: from localhost.localdomain ([2a00:6d43:105:c401:e307:1a37:2e76:ce91]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4778c850000sm41700085e9.4.2025.11.13.08.12.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Nov 2025 08:12:57 -0800 (PST) From: Marco Crivellari To: linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org Cc: Tejun Heo , Lai Jiangshan , Frederic Weisbecker , Sebastian Andrzej Siewior , Marco Crivellari , Michal Hocko , Kalle Valo Subject: [PATCH 2/2] cw1200: add WQ_PERCPU to alloc_workqueue users Date: Thu, 13 Nov 2025 17:12:48 +0100 Message-ID: <20251113161248.387964-3-marco.crivellari@suse.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251113161248.387964-1-marco.crivellari@suse.com> References: <20251113161248.387964-1-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. For more details see the Link tag below. 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. Suggested-by: Tejun Heo Signed-off-by: Marco Crivellari Link: https://lore.kernel.org/all/20250221112003.1dSuoGyc@linutronix.de/ --- drivers/net/wireless/st/cw1200/bh.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/st/cw1200/bh.c b/drivers/net/wireless/st/= cw1200/bh.c index 3b4ded2ac801..bdf7132c5849 100644 --- a/drivers/net/wireless/st/cw1200/bh.c +++ b/drivers/net/wireless/st/cw1200/bh.c @@ -54,8 +54,9 @@ int cw1200_register_bh(struct cw1200_common *priv) int err =3D 0; /* Realtime workqueue */ priv->bh_workqueue =3D alloc_workqueue("cw1200_bh", - WQ_MEM_RECLAIM | WQ_HIGHPRI - | WQ_CPU_INTENSIVE, 1); + WQ_MEM_RECLAIM | WQ_HIGHPRI | + WQ_CPU_INTENSIVE | WQ_PERCPU, + 1); =20 if (!priv->bh_workqueue) return -ENOMEM; --=20 2.51.1