167 	struct worker		*manager;	/* L: purely informational */
250 	struct worker		*rescuer;	/* I: rescue worker */
393 #define for_each_pool_worker(worker, pool)				\  argument
394 	list_for_each_entry((worker), &(pool)->workers, node)		\
828 static struct worker *first_idle_worker(struct worker_pool *pool)  in first_idle_worker()
833 	return list_first_entry(&pool->idle_list, struct worker, entry);  in first_idle_worker()
847 	struct worker *worker = first_idle_worker(pool);  in wake_up_worker()  local
849 	if (likely(worker))  in wake_up_worker()
850 		wake_up_process(worker->task);  in wake_up_worker()
866 	struct worker *worker = kthread_data(task);  in wq_worker_waking_up()  local
868 	if (!(worker->flags & WORKER_NOT_RUNNING)) {  in wq_worker_waking_up()
869 		WARN_ON_ONCE(worker->pool->cpu != cpu);  in wq_worker_waking_up()
870 		atomic_inc(&worker->pool->nr_running);  in wq_worker_waking_up()
891 	struct worker *worker = kthread_data(task), *to_wakeup = NULL;  in wq_worker_sleeping()  local
899 	if (worker->flags & WORKER_NOT_RUNNING)  in wq_worker_sleeping()
902 	pool = worker->pool;  in wq_worker_sleeping()
935 static inline void worker_set_flags(struct worker *worker, unsigned int flags)  in worker_set_flags()  argument
937 	struct worker_pool *pool = worker->pool;  in worker_set_flags()
939 	WARN_ON_ONCE(worker->task != current);  in worker_set_flags()
943 	    !(worker->flags & WORKER_NOT_RUNNING)) {  in worker_set_flags()
947 	worker->flags |= flags;  in worker_set_flags()
960 static inline void worker_clr_flags(struct worker *worker, unsigned int flags)  in worker_clr_flags()  argument
962 	struct worker_pool *pool = worker->pool;  in worker_clr_flags()
963 	unsigned int oflags = worker->flags;  in worker_clr_flags()
965 	WARN_ON_ONCE(worker->task != current);  in worker_clr_flags()
967 	worker->flags &= ~flags;  in worker_clr_flags()
975 		if (!(worker->flags & WORKER_NOT_RUNNING))  in worker_clr_flags()
1012 static struct worker *find_worker_executing_work(struct worker_pool *pool,  in find_worker_executing_work()
1015 	struct worker *worker;  in find_worker_executing_work()  local
1017 	hash_for_each_possible(pool->busy_hash, worker, hentry,  in find_worker_executing_work()
1019 		if (worker->current_work == work &&  in find_worker_executing_work()
1020 		    worker->current_func == work->func)  in find_worker_executing_work()
1021 			return worker;  in find_worker_executing_work()
1331 	struct worker *worker;  in is_chained_work()  local
1333 	worker = current_wq_worker();  in is_chained_work()
1338 	return worker && worker->current_pwq->wq == wq;  in is_chained_work()
1381 		struct worker *worker;  in __queue_work()  local
1385 		worker = find_worker_executing_work(last_pool, work);  in __queue_work()
1387 		if (worker && worker->current_pwq->wq == wq) {  in __queue_work()
1388 			pwq = worker->current_pwq;  in __queue_work()
1593 static void worker_enter_idle(struct worker *worker)  in worker_enter_idle()  argument
1595 	struct worker_pool *pool = worker->pool;  in worker_enter_idle()
1597 	if (WARN_ON_ONCE(worker->flags & WORKER_IDLE) ||  in worker_enter_idle()
1598 	    WARN_ON_ONCE(!list_empty(&worker->entry) &&  in worker_enter_idle()
1599 			 (worker->hentry.next || worker->hentry.pprev)))  in worker_enter_idle()
1603 	worker->flags |= WORKER_IDLE;  in worker_enter_idle()
1605 	worker->last_active = jiffies;  in worker_enter_idle()
1608 	list_add(&worker->entry, &pool->idle_list);  in worker_enter_idle()
1633 static void worker_leave_idle(struct worker *worker)  in worker_leave_idle()  argument
1635 	struct worker_pool *pool = worker->pool;  in worker_leave_idle()
1637 	if (WARN_ON_ONCE(!(worker->flags & WORKER_IDLE)))  in worker_leave_idle()
1639 	worker_clr_flags(worker, WORKER_IDLE);  in worker_leave_idle()
1641 	list_del_init(&worker->entry);  in worker_leave_idle()
1644 static struct worker *alloc_worker(int node)  in alloc_worker()
1646 	struct worker *worker;  in alloc_worker()  local
1648 	worker = kzalloc_node(sizeof(*worker), GFP_KERNEL, node);  in alloc_worker()
1649 	if (worker) {  in alloc_worker()
1650 		INIT_LIST_HEAD(&worker->entry);  in alloc_worker()
1651 		INIT_LIST_HEAD(&worker->scheduled);  in alloc_worker()
1652 		INIT_LIST_HEAD(&worker->node);  in alloc_worker()
1654 		worker->flags = WORKER_PREP;  in alloc_worker()
1656 	return worker;  in alloc_worker()
1668 static void worker_attach_to_pool(struct worker *worker,  in worker_attach_to_pool()  argument
1677 	set_cpus_allowed_ptr(worker->task, pool->attrs->cpumask);  in worker_attach_to_pool()
1685 		worker->flags |= WORKER_UNBOUND;  in worker_attach_to_pool()
1687 	list_add_tail(&worker->node, &pool->workers);  in worker_attach_to_pool()
1701 static void worker_detach_from_pool(struct worker *worker,  in worker_detach_from_pool()  argument
1707 	list_del(&worker->node);  in worker_detach_from_pool()
1713 	worker->flags &= ~(WORKER_UNBOUND | WORKER_REBOUND);  in worker_detach_from_pool()
1731 static struct worker *create_worker(struct worker_pool *pool)  in create_worker()
1733 	struct worker *worker = NULL;  in create_worker()  local
1742 	worker = alloc_worker(pool->node);  in create_worker()
1743 	if (!worker)  in create_worker()
1746 	worker->pool = pool;  in create_worker()
1747 	worker->id = id;  in create_worker()
1755 	worker->task = kthread_create_on_node(worker_thread, worker, pool->node,  in create_worker()
1757 	if (IS_ERR(worker->task))  in create_worker()
1760 	set_user_nice(worker->task, pool->attrs->nice);  in create_worker()
1763 	worker->task->flags |= PF_NO_SETAFFINITY;  in create_worker()
1766 	worker_attach_to_pool(worker, pool);  in create_worker()
1770 	worker->pool->nr_workers++;  in create_worker()
1771 	worker_enter_idle(worker);  in create_worker()
1772 	wake_up_process(worker->task);  in create_worker()
1775 	return worker;  in create_worker()
1780 	kfree(worker);  in create_worker()
1794 static void destroy_worker(struct worker *worker)  in destroy_worker()  argument
1796 	struct worker_pool *pool = worker->pool;  in destroy_worker()
1801 	if (WARN_ON(worker->current_work) ||  in destroy_worker()
1802 	    WARN_ON(!list_empty(&worker->scheduled)) ||  in destroy_worker()
1803 	    WARN_ON(!(worker->flags & WORKER_IDLE)))  in destroy_worker()
1809 	list_del_init(&worker->entry);  in destroy_worker()
1810 	worker->flags |= WORKER_DIE;  in destroy_worker()
1811 	wake_up_process(worker->task);  in destroy_worker()
1821 		struct worker *worker;  in idle_worker_timeout()  local
1825 		worker = list_entry(pool->idle_list.prev, struct worker, entry);  in idle_worker_timeout()
1826 		expires = worker->last_active + IDLE_WORKER_TIMEOUT;  in idle_worker_timeout()
1833 		destroy_worker(worker);  in idle_worker_timeout()
1958 static bool manage_workers(struct worker *worker)  in manage_workers()  argument
1960 	struct worker_pool *pool = worker->pool;  in manage_workers()
1974 	pool->manager = worker;  in manage_workers()
1997 static void process_one_work(struct worker *worker, struct work_struct *work)  in process_one_work()  argument
2002 	struct worker_pool *pool = worker->pool;  in process_one_work()
2005 	struct worker *collision;  in process_one_work()
2036 	hash_add(pool->busy_hash, &worker->hentry, (unsigned long)work);  in process_one_work()
2037 	worker->current_work = work;  in process_one_work()
2038 	worker->current_func = work->func;  in process_one_work()
2039 	worker->current_pwq = pwq;  in process_one_work()
2051 		worker_set_flags(worker, WORKER_CPU_INTENSIVE);  in process_one_work()
2076 	worker->current_func(work);  in process_one_work()
2089 		       worker->current_func);  in process_one_work()
2108 		worker_clr_flags(worker, WORKER_CPU_INTENSIVE);  in process_one_work()
2111 	hash_del(&worker->hentry);  in process_one_work()
2112 	worker->current_work = NULL;  in process_one_work()
2113 	worker->current_func = NULL;  in process_one_work()
2114 	worker->current_pwq = NULL;  in process_one_work()
2115 	worker->desc_valid = false;  in process_one_work()
2131 static void process_scheduled_works(struct worker *worker)  in process_scheduled_works()  argument
2133 	while (!list_empty(&worker->scheduled)) {  in process_scheduled_works()
2134 		struct work_struct *work = list_first_entry(&worker->scheduled,  in process_scheduled_works()
2136 		process_one_work(worker, work);  in process_scheduled_works()
2154 	struct worker *worker = __worker;  in worker_thread()  local
2155 	struct worker_pool *pool = worker->pool;  in worker_thread()
2158 	worker->task->flags |= PF_WQ_WORKER;  in worker_thread()
2163 	if (unlikely(worker->flags & WORKER_DIE)) {  in worker_thread()
2165 		WARN_ON_ONCE(!list_empty(&worker->entry));  in worker_thread()
2166 		worker->task->flags &= ~PF_WQ_WORKER;  in worker_thread()
2168 		set_task_comm(worker->task, "kworker/dying");  in worker_thread()
2169 		ida_simple_remove(&pool->worker_ida, worker->id);  in worker_thread()
2170 		worker_detach_from_pool(worker, pool);  in worker_thread()
2171 		kfree(worker);  in worker_thread()
2175 	worker_leave_idle(worker);  in worker_thread()
2182 	if (unlikely(!may_start_working(pool)) && manage_workers(worker))  in worker_thread()
2190 	WARN_ON_ONCE(!list_empty(&worker->scheduled));  in worker_thread()
2199 	worker_clr_flags(worker, WORKER_PREP | WORKER_REBOUND);  in worker_thread()
2208 			process_one_work(worker, work);  in worker_thread()
2209 			if (unlikely(!list_empty(&worker->scheduled)))  in worker_thread()
2210 				process_scheduled_works(worker);  in worker_thread()
2212 			move_linked_works(work, &worker->scheduled, NULL);  in worker_thread()
2213 			process_scheduled_works(worker);  in worker_thread()
2217 	worker_set_flags(worker, WORKER_PREP);  in worker_thread()
2226 	worker_enter_idle(worker);  in worker_thread()
2256 	struct worker *rescuer = __rescuer;  in rescuer_thread()
2403 			      struct work_struct *target, struct worker *worker)  in insert_wq_barrier()  argument
2423 	if (worker)  in insert_wq_barrier()
2424 		head = worker->scheduled.next;  in insert_wq_barrier()
2720 	struct worker *worker = NULL;  in start_flush_work()  local
2740 		worker = find_worker_executing_work(pool, work);  in start_flush_work()
2741 		if (!worker)  in start_flush_work()
2743 		pwq = worker->current_pwq;  in start_flush_work()
2746 	insert_wq_barrier(pwq, barr, work, worker);  in start_flush_work()
3211 	struct worker *worker;  in put_unbound_pool()  local
3236 	while ((worker = first_idle_worker(pool)))  in put_unbound_pool()
3237 		destroy_worker(worker);  in put_unbound_pool()
3903 		struct worker *rescuer;  in __alloc_workqueue_key()
4071 	struct worker *worker = current_wq_worker();  in current_is_workqueue_rescuer()  local
4073 	return worker && worker->rescue_wq;  in current_is_workqueue_rescuer()
4162 	struct worker *worker = current_wq_worker();  in set_worker_desc()  local
4165 	if (worker) {  in set_worker_desc()
4167 		vsnprintf(worker->desc, sizeof(worker->desc), fmt, args);  in set_worker_desc()
4169 		worker->desc_valid = true;  in set_worker_desc()
4194 	struct worker *worker;  in print_worker_info()  local
4203 	worker = probe_kthread_data(task);  in print_worker_info()
4209 	probe_kernel_read(&fn, &worker->current_func, sizeof(fn));  in print_worker_info()
4210 	probe_kernel_read(&pwq, &worker->current_pwq, sizeof(pwq));  in print_worker_info()
4215 	probe_kernel_read(&desc_valid, &worker->desc_valid, sizeof(desc_valid));  in print_worker_info()
4217 		probe_kernel_read(desc, worker->desc, sizeof(desc) - 1);  in print_worker_info()
4253 	struct worker *worker;  in show_pwq()  local
4263 	hash_for_each(pool->busy_hash, bkt, worker, hentry) {  in show_pwq()
4264 		if (worker->current_pwq == pwq) {  in show_pwq()
4273 		hash_for_each(pool->busy_hash, bkt, worker, hentry) {  in show_pwq()
4274 			if (worker->current_pwq != pwq)  in show_pwq()
4278 				task_pid_nr(worker->task),  in show_pwq()
4279 				worker == pwq->wq->rescuer ? "(RESCUER)" : "",  in show_pwq()
4280 				worker->current_func);  in show_pwq()
4281 			list_for_each_entry(work, &worker->scheduled, entry)  in show_pwq()
4361 		struct worker *worker;  in show_workqueue_state()  local
4374 		list_for_each_entry(worker, &pool->idle_list, entry) {  in show_workqueue_state()
4376 				task_pid_nr(worker->task));  in show_workqueue_state()
4406 	struct worker *worker;  in wq_unbind_fn()  local
4419 		for_each_pool_worker(worker, pool)  in wq_unbind_fn()
4420 			worker->flags |= WORKER_UNBOUND;  in wq_unbind_fn()
4464 	struct worker *worker;  in rebind_workers()  local
4475 	for_each_pool_worker(worker, pool)  in rebind_workers()
4476 		WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task,  in rebind_workers()
4493 	for_each_pool_worker(worker, pool) {  in rebind_workers()
4494 		unsigned int worker_flags = worker->flags;  in rebind_workers()
4505 			wake_up_process(worker->task);  in rebind_workers()
4525 		ACCESS_ONCE(worker->flags) = worker_flags;  in rebind_workers()
4544 	struct worker *worker;  in restore_unbound_workers_cpumask()  local
4558 	for_each_pool_worker(worker, pool)  in restore_unbound_workers_cpumask()
4559 		WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task,  in restore_unbound_workers_cpumask()