for_each_pwq(9)

💖 for_each_pwq(9) — Kernel API Manual 💖

okay bestie, welcome to the Kernel API Manual page for for_each_pwq — it’s giving “little iterator with big responsibilities” energy, and we’re gonna get through it together 💅✨

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🦋 SYNOPSIS 🦋

for_each_pwq (pwq , wq );

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🎀 ARGUMENTS 🎀

• pwq — iteration cursor, aka the little “where are we now” bestie 💫
• wq — the target workqueue 🎯

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✨ DESCRIPTION ✨

okay so this one iterates through all the pool_workqueues of the specified workqueue — yes, all of them, no cap 💖

bestie, locking check: this must be called either with wq->mutex held or RCU read locked. like, actually must. 🔒

If the pwq needs to be used beyond the locking in effect, the caller is responsible for guaranteeing that the pwq stays online. that part is on you, not the iterator — keep your fave pwq alive, please 🫶

The if/else clause exists only for the lockdep assertion and can be ignored. literally just there for the lockdep assertion, so don’t stress about it 🌸

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💅 SEE ALSO 💅

Kernel file ./kernel/workqueue.c and the whole extended friend group:

• for_each_pool(9), for_each_pool_worker(9), worker_pool_assign_id(9), unbound_effective_cpumask(9), get_work_pool(9), worker_set_flags(9), worker_clr_flags(9)
• worker_enter_idle(9), worker_leave_idle(9), find_worker_executing_work(9), move_linked_works(9), assign_work(9), kick_pool_pick(9), kick_pool(9)
• wq_worker_running(9), wq_worker_sleeping(9), wq_worker_tick(9), wq_worker_last_func(9), wq_node_nr_active(9), wq_update_node_max_active(9)
• get_pwq(9), put_pwq(9), put_pwq_unlocked(9), pwq_tryinc_nr_active(9), pwq_activate_first_inactive(9), unplug_oldest_pwq(9)
• node_activate_pending_pwq(9), pwq_dec_nr_active(9), pwq_dec_nr_in_flight(9), try_to_grab_pending(9), work_grab_pending(9)
• insert_work(9), queue_work_on(9), select_numa_node_cpu(9), queue_work_node(9), queue_delayed_work_on(9), mod_delayed_work_on(9)
• queue_rcu_work(9), worker_attach_to_pool(9), worker_detach_from_pool(9), create_worker(9), set_worker_dying(9), idle_worker_timeout(9)
• idle_cull_fn(9), maybe_create_worker(9), manage_workers(9), process_one_work(9), process_scheduled_works(9), worker_thread(9)
• rescuer_thread(9), check_flush_dependency(9), insert_wq_barrier(9), flush_workqueue_prep_pwqs(9), __flush_workqueue(9), drain_workqueue(9)
• flush_work(9), flush_delayed_work(9), flush_rcu_work(9), cancel_work_sync(9), cancel_delayed_work(9), cancel_delayed_work_sync(9)
• disable_work(9), disable_work_sync(9), enable_work(9), disable_delayed_work(9), disable_delayed_work_sync(9), enable_delayed_work(9)
• schedule_on_each_cpu(9), execute_in_process_context(9), free_workqueue_attrs(9), alloc_workqueue_attrs(9), init_worker_pool(9), put_unbound_pool(9)
• get_unbound_pool(9), wq_calc_pod_cpumask(9), apply_workqueue_attrs(9), unbound_wq_update_pwq(9), wq_adjust_max_active(9), destroy_workqueue(9)
• workqueue_set_max_active(9), workqueue_set_min_active(9), current_work(9), current_is_workqueue_rescuer(9), current_is_workqueue_mem_reclaim(9)
• workqueue_congested(9), work_busy(9), set_worker_desc(9), print_worker_info(9), show_one_workqueue(9), show_one_worker_pool(9), show_all_workqueues(9)
• show_freezable_workqueues(9), rebind_workers(9), restore_unbound_workers_cpumask(9), work_on_cpu_key(9), freeze_workqueues_begin(9), freeze_workqueues_busy(9)
• thaw_workqueues(9), workqueue_unbound_housekeeping_update(9), workqueue_set_unbound_cpumask(9), workqueue_sysfs_register(9), workqueue_sysfs_unregister(9)
• workqueue_init_early(9), workqueue_init(9), llc_count_cores(9), llc_populate_cpu_shard_id(9), precompute_cache_shard_ids(9), workqueue_init_topology(9)

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okay bye bestie 💖 this page’s footer vibe is source/version ./kernel, date October 2026, and the page is for_each_pwq(9) — stay locked, stay online, slay 🫶🎀✨