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Wed, 05 Nov 2025 07:08:38 -0800 (PST) Received: from localhost.localdomain ([2a00:6d43:105:c401:e307:1a37:2e76:ce91]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-429dc19258bsm11750758f8f.12.2025.11.05.07.08.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Nov 2025 07:08:38 -0800 (PST) From: Marco Crivellari To: linux-kernel@vger.kernel.org, nvdimm@lists.linux.dev Cc: Tejun Heo , Lai Jiangshan , Frederic Weisbecker , Sebastian Andrzej Siewior , Marco Crivellari , Michal Hocko , Dan Williams , Vishal Verma , Dave Jiang , Ira Weiny Subject: [PATCH] nvdimm: replace use of system_wq with system_percpu_wq Date: Wed, 5 Nov 2025 16:08:26 +0100 Message-ID: <20251105150826.248673-1-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-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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. This patch continues the effort to refactor worqueue APIs, which has begun with the change introducing new workqueues and a new alloc_workqueue flag: commit 128ea9f6ccfb ("workqueue: Add system_percpu_wq and system_dfl_wq") commit 930c2ea566af ("workqueue: Add new WQ_PERCPU flag") Replace system_wq with system_percpu_wq, keeping the same old behavior. The old wq (system_wq) will be kept for a few release cycles. Suggested-by: Tejun Heo Signed-off-by: Marco Crivellari Reviewed-by: Dave Jiang > --- Reviewed-by: Ira Weiny --- drivers/nvdimm/security.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/nvdimm/security.c b/drivers/nvdimm/security.c index 4adce8c38870..e41f6951ca0f 100644 --- a/drivers/nvdimm/security.c +++ b/drivers/nvdimm/security.c @@ -424,7 +424,7 @@ static int security_overwrite(struct nvdimm *nvdimm, un= signed int keyid) * query. */ get_device(dev); - queue_delayed_work(system_wq, &nvdimm->dwork, 0); + queue_delayed_work(system_percpu_wq, &nvdimm->dwork, 0); } =20 return rc; @@ -457,7 +457,7 @@ static void __nvdimm_security_overwrite_query(struct nv= dimm *nvdimm) =20 /* setup delayed work again */ tmo +=3D 10; - queue_delayed_work(system_wq, &nvdimm->dwork, tmo * HZ); + queue_delayed_work(system_percpu_wq, &nvdimm->dwork, tmo * HZ); nvdimm->sec.overwrite_tmo =3D min(15U * 60U, tmo); return; } --=20 2.51.1