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Fri, 07 Nov 2025 06:15:05 -0800 (PST) Received: from localhost.localdomain ([2a00:6d43:105:c401:e307:1a37:2e76:ce91]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-42ac677abeasm5493343f8f.33.2025.11.07.06.15.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 07 Nov 2025 06:15:04 -0800 (PST) From: Marco Crivellari To: linux-kernel@vger.kernel.org, MPT-FusionLinux.pdl@broadcom.com, linux-scsi@vger.kernel.org Cc: Tejun Heo , Lai Jiangshan , Frederic Weisbecker , Sebastian Andrzej Siewior , Marco Crivellari , Michal Hocko , Sathya Prakash , Sreekanth Reddy , Suganath Prabu Subramani Subject: [PATCH] scsi: message: fusion: add WQ_PERCPU to alloc_workqueue users Date: Fri, 7 Nov 2025 15:14:58 +0100 Message-ID: <20251107141458.225119-1-marco.crivellari@suse.com> X-Mailer: git-send-email 2.51.1 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. Suggested-by: Tejun Heo Signed-off-by: Marco Crivellari --- drivers/message/fusion/mptbase.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptb= ase.c index 738bc4e60a18..e60a8d3947c9 100644 --- a/drivers/message/fusion/mptbase.c +++ b/drivers/message/fusion/mptbase.c @@ -1857,7 +1857,8 @@ mpt_attach(struct pci_dev *pdev, const struct pci_dev= ice_id *id) INIT_DELAYED_WORK(&ioc->fault_reset_work, mpt_fault_reset_work); =20 ioc->reset_work_q =3D - alloc_workqueue("mpt_poll_%d", WQ_MEM_RECLAIM, 0, ioc->id); + alloc_workqueue("mpt_poll_%d", WQ_MEM_RECLAIM | WQ_PERCPU, 0, + ioc->id); if (!ioc->reset_work_q) { printk(MYIOC_s_ERR_FMT "Insufficient memory to add adapter!\n", ioc->name); @@ -1984,7 +1985,9 @@ mpt_attach(struct pci_dev *pdev, const struct pci_dev= ice_id *id) =20 INIT_LIST_HEAD(&ioc->fw_event_list); spin_lock_init(&ioc->fw_event_lock); - ioc->fw_event_q =3D alloc_workqueue("mpt/%d", WQ_MEM_RECLAIM, 0, ioc->id); + ioc->fw_event_q =3D alloc_workqueue("mpt/%d", + WQ_MEM_RECLAIM | WQ_PERCPU, 0, + ioc->id); if (!ioc->fw_event_q) { printk(MYIOC_s_ERR_FMT "Insufficient memory to add adapter!\n", ioc->name); --=20 2.51.1