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Patch series "Replace wq users and add WQ_PERCPU to alloc_workqueue() users", v2. This series continues the effort to refactor the Workqueue API. No behavior changes are introduced by this series. === Recent changes to the WQ API === The following, address the recent changes in the Workqueue API: - commit128ea9f6cc("workqueue: Add system_percpu_wq and system_dfl_wq") - commit930c2ea566("workqueue: Add new WQ_PERCPU flag") The old workqueues will be removed in a future release cycle and unbound will become the implicit default. === Introduced Changes by this series === 1) [P 1-2] Replace use of system_wq and system_unbound_wq Workqueue users converted to the better named new workqueues: system_wq -> system_percpu_wq system_unbound_wq -> system_dfl_wq This way the old obsolete workqueues (system_wq, system_unbound_wq) can be removed in the future. 2) [P 3] add WQ_PERCPU to remaining alloc_workqueue() users 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. WQ_UNBOUND will be removed in future. For more information: https://lore.kernel.org/all/20250221112003.1dSuoGyc@linutronix.de/ This patch (of 3): This patch continues the effort to refactor workqueue APIs, which has begun with the changes introducing new workqueues and a new alloc_workqueue flag: commit128ea9f6cc("workqueue: Add system_percpu_wq and system_dfl_wq") commit930c2ea566("workqueue: Add new WQ_PERCPU flag") The point of the refactoring is to eventually alter the default behavior of workqueues to become unbound by default so that their workload placement is optimized by the scheduler. Before that to happen, workqueue users must be converted to the better named new workqueues with no intended behaviour changes: system_wq -> system_percpu_wq system_unbound_wq -> system_dfl_wq This way the old obsolete workqueues (system_wq, system_unbound_wq) can be removed in the future. Link: https://lkml.kernel.org/r/20260113114630.152942-1-marco.crivellari@suse.com Link: https://lore.kernel.org/all/20250221112003.1dSuoGyc@linutronix.de/ Link: https://lkml.kernel.org/r/20260113114630.152942-2-marco.crivellari@suse.com Signed-off-by: Marco Crivellari <marco.crivellari@suse.com> Suggested-by: Tejun Heo <tj@kernel.org> Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Reviewed-by: Frederic Weisbecker <frederic@kernel.org> Cc: Alexander Potapenko <glider@google.com> Cc: David Hildenbrand <david@kernel.org> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Lai jiangshan <jiangshanlai@gmail.com> Cc: "Liam R. Howlett" <Liam.Howlett@oracle.com> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Marco Elver <elver@google.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Muchun Song <muchun.song@linux.dev> Cc: Roman Gushchin <roman.gushchin@linux.dev> Cc: Shakeel Butt <shakeel.butt@linux.dev> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>