168 	struct worker		*manager;	/* L: purely informational */
250 	struct worker		*rescuer;	/* I: rescue worker */
407 #define for_each_pool_worker(worker, pool)				\  argument
408 	list_for_each_entry((worker), &(pool)->workers, node)		\
816 static struct worker *first_idle_worker(struct worker_pool *pool)  in first_idle_worker()
821 	return list_first_entry(&pool->idle_list, struct worker, entry);  in first_idle_worker()
835 	struct worker *worker = first_idle_worker(pool);  in wake_up_worker()  local
837 	if (likely(worker))  in wake_up_worker()
838 		wake_up_process(worker->task);  in wake_up_worker()
854 	struct worker *worker = kthread_data(task);  in wq_worker_waking_up()  local
856 	if (!(worker->flags & WORKER_NOT_RUNNING)) {  in wq_worker_waking_up()
857 		WARN_ON_ONCE(worker->pool->cpu != cpu);  in wq_worker_waking_up()
858 		atomic_inc(&worker->pool->nr_running);  in wq_worker_waking_up()
878 	struct worker *worker = kthread_data(task), *to_wakeup = NULL;  in wq_worker_sleeping()  local
886 	if (worker->flags & WORKER_NOT_RUNNING)  in wq_worker_sleeping()
889 	pool = worker->pool;  in wq_worker_sleeping()
922 static inline void worker_set_flags(struct worker *worker, unsigned int flags)  in worker_set_flags()  argument
924 	struct worker_pool *pool = worker->pool;  in worker_set_flags()
926 	WARN_ON_ONCE(worker->task != current);  in worker_set_flags()
930 	    !(worker->flags & WORKER_NOT_RUNNING)) {  in worker_set_flags()
934 	worker->flags |= flags;  in worker_set_flags()
947 static inline void worker_clr_flags(struct worker *worker, unsigned int flags)  in worker_clr_flags()  argument
949 	struct worker_pool *pool = worker->pool;  in worker_clr_flags()
950 	unsigned int oflags = worker->flags;  in worker_clr_flags()
952 	WARN_ON_ONCE(worker->task != current);  in worker_clr_flags()
954 	worker->flags &= ~flags;  in worker_clr_flags()
962 		if (!(worker->flags & WORKER_NOT_RUNNING))  in worker_clr_flags()
999 static struct worker *find_worker_executing_work(struct worker_pool *pool,  in find_worker_executing_work()
1002 	struct worker *worker;  in find_worker_executing_work()  local
1004 	hash_for_each_possible(pool->busy_hash, worker, hentry,  in find_worker_executing_work()
1006 		if (worker->current_work == work &&  in find_worker_executing_work()
1007 		    worker->current_func == work->func)  in find_worker_executing_work()
1008 			return worker;  in find_worker_executing_work()
1320 	struct worker *worker;  in is_chained_work()  local
1322 	worker = current_wq_worker();  in is_chained_work()
1327 	return worker && worker->current_pwq->wq == wq;  in is_chained_work()
1403 		struct worker *worker;  in __queue_work()  local
1407 		worker = find_worker_executing_work(last_pool, work);  in __queue_work()
1409 		if (worker && worker->current_pwq->wq == wq) {  in __queue_work()
1410 			pwq = worker->current_pwq;  in __queue_work()
1649 static void worker_enter_idle(struct worker *worker)  in worker_enter_idle()  argument
1651 	struct worker_pool *pool = worker->pool;  in worker_enter_idle()
1653 	if (WARN_ON_ONCE(worker->flags & WORKER_IDLE) ||  in worker_enter_idle()
1654 	    WARN_ON_ONCE(!list_empty(&worker->entry) &&  in worker_enter_idle()
1655 			 (worker->hentry.next || worker->hentry.pprev)))  in worker_enter_idle()
1659 	worker->flags |= WORKER_IDLE;  in worker_enter_idle()
1661 	worker->last_active = jiffies;  in worker_enter_idle()
1664 	list_add(&worker->entry, &pool->idle_list);  in worker_enter_idle()
1689 static void worker_leave_idle(struct worker *worker)  in worker_leave_idle()  argument
1691 	struct worker_pool *pool = worker->pool;  in worker_leave_idle()
1693 	if (WARN_ON_ONCE(!(worker->flags & WORKER_IDLE)))  in worker_leave_idle()
1695 	worker_clr_flags(worker, WORKER_IDLE);  in worker_leave_idle()
1697 	list_del_init(&worker->entry);  in worker_leave_idle()
1700 static struct worker *alloc_worker(int node)  in alloc_worker()
1702 	struct worker *worker;  in alloc_worker()  local
1704 	worker = kzalloc_node(sizeof(*worker), GFP_KERNEL, node);  in alloc_worker()
1705 	if (worker) {  in alloc_worker()
1706 		INIT_LIST_HEAD(&worker->entry);  in alloc_worker()
1707 		INIT_LIST_HEAD(&worker->scheduled);  in alloc_worker()
1708 		INIT_LIST_HEAD(&worker->node);  in alloc_worker()
1710 		worker->flags = WORKER_PREP;  in alloc_worker()
1712 	return worker;  in alloc_worker()
1724 static void worker_attach_to_pool(struct worker *worker,  in worker_attach_to_pool()  argument
1733 	set_cpus_allowed_ptr(worker->task, pool->attrs->cpumask);  in worker_attach_to_pool()
1741 		worker->flags |= WORKER_UNBOUND;  in worker_attach_to_pool()
1743 	list_add_tail(&worker->node, &pool->workers);  in worker_attach_to_pool()
1744 	worker->pool = pool;  in worker_attach_to_pool()
1757 static void worker_detach_from_pool(struct worker *worker)  in worker_detach_from_pool()  argument
1759 	struct worker_pool *pool = worker->pool;  in worker_detach_from_pool()
1764 	list_del(&worker->node);  in worker_detach_from_pool()
1765 	worker->pool = NULL;  in worker_detach_from_pool()
1772 	worker->flags &= ~(WORKER_UNBOUND | WORKER_REBOUND);  in worker_detach_from_pool()
1790 static struct worker *create_worker(struct worker_pool *pool)  in create_worker()
1792 	struct worker *worker = NULL;  in create_worker()  local
1801 	worker = alloc_worker(pool->node);  in create_worker()
1802 	if (!worker)  in create_worker()
1805 	worker->id = id;  in create_worker()
1813 	worker->task = kthread_create_on_node(worker_thread, worker, pool->node,  in create_worker()
1815 	if (IS_ERR(worker->task))  in create_worker()
1818 	set_user_nice(worker->task, pool->attrs->nice);  in create_worker()
1819 	kthread_bind_mask(worker->task, pool->attrs->cpumask);  in create_worker()
1822 	worker_attach_to_pool(worker, pool);  in create_worker()
1826 	worker->pool->nr_workers++;  in create_worker()
1827 	worker_enter_idle(worker);  in create_worker()
1828 	wake_up_process(worker->task);  in create_worker()
1831 	return worker;  in create_worker()
1836 	kfree(worker);  in create_worker()
1850 static void destroy_worker(struct worker *worker)  in destroy_worker()  argument
1852 	struct worker_pool *pool = worker->pool;  in destroy_worker()
1857 	if (WARN_ON(worker->current_work) ||  in destroy_worker()
1858 	    WARN_ON(!list_empty(&worker->scheduled)) ||  in destroy_worker()
1859 	    WARN_ON(!(worker->flags & WORKER_IDLE)))  in destroy_worker()
1865 	list_del_init(&worker->entry);  in destroy_worker()
1866 	worker->flags |= WORKER_DIE;  in destroy_worker()
1867 	wake_up_process(worker->task);  in destroy_worker()
1877 		struct worker *worker;  in idle_worker_timeout()  local
1881 		worker = list_entry(pool->idle_list.prev, struct worker, entry);  in idle_worker_timeout()
1882 		expires = worker->last_active + IDLE_WORKER_TIMEOUT;  in idle_worker_timeout()
1889 		destroy_worker(worker);  in idle_worker_timeout()
2014 static bool manage_workers(struct worker *worker)  in manage_workers()  argument
2016 	struct worker_pool *pool = worker->pool;  in manage_workers()
2022 	pool->manager = worker;  in manage_workers()
2046 static void process_one_work(struct worker *worker, struct work_struct *work)  in process_one_work()  argument
2051 	struct worker_pool *pool = worker->pool;  in process_one_work()
2054 	struct worker *collision;  in process_one_work()
2085 	hash_add(pool->busy_hash, &worker->hentry, (unsigned long)work);  in process_one_work()
2086 	worker->current_work = work;  in process_one_work()
2087 	worker->current_func = work->func;  in process_one_work()
2088 	worker->current_pwq = pwq;  in process_one_work()
2095 	strscpy(worker->desc, pwq->wq->name, WORKER_DESC_LEN);  in process_one_work()
2106 		worker_set_flags(worker, WORKER_CPU_INTENSIVE);  in process_one_work()
2153 	worker->current_func(work);  in process_one_work()
2166 		       worker->current_func);  in process_one_work()
2185 		worker_clr_flags(worker, WORKER_CPU_INTENSIVE);  in process_one_work()
2188 	hash_del(&worker->hentry);  in process_one_work()
2189 	worker->current_work = NULL;  in process_one_work()
2190 	worker->current_func = NULL;  in process_one_work()
2191 	worker->current_pwq = NULL;  in process_one_work()
2207 static void process_scheduled_works(struct worker *worker)  in process_scheduled_works()  argument
2209 	while (!list_empty(&worker->scheduled)) {  in process_scheduled_works()
2210 		struct work_struct *work = list_first_entry(&worker->scheduled,  in process_scheduled_works()
2212 		process_one_work(worker, work);  in process_scheduled_works()
2240 	struct worker *worker = __worker;  in worker_thread()  local
2241 	struct worker_pool *pool = worker->pool;  in worker_thread()
2249 	if (unlikely(worker->flags & WORKER_DIE)) {  in worker_thread()
2251 		WARN_ON_ONCE(!list_empty(&worker->entry));  in worker_thread()
2254 		set_task_comm(worker->task, "kworker/dying");  in worker_thread()
2255 		ida_simple_remove(&pool->worker_ida, worker->id);  in worker_thread()
2256 		worker_detach_from_pool(worker);  in worker_thread()
2257 		kfree(worker);  in worker_thread()
2261 	worker_leave_idle(worker);  in worker_thread()
2268 	if (unlikely(!may_start_working(pool)) && manage_workers(worker))  in worker_thread()
2276 	WARN_ON_ONCE(!list_empty(&worker->scheduled));  in worker_thread()
2285 	worker_clr_flags(worker, WORKER_PREP | WORKER_REBOUND);  in worker_thread()
2296 			process_one_work(worker, work);  in worker_thread()
2297 			if (unlikely(!list_empty(&worker->scheduled)))  in worker_thread()
2298 				process_scheduled_works(worker);  in worker_thread()
2300 			move_linked_works(work, &worker->scheduled, NULL);  in worker_thread()
2301 			process_scheduled_works(worker);  in worker_thread()
2305 	worker_set_flags(worker, WORKER_PREP);  in worker_thread()
2314 	worker_enter_idle(worker);  in worker_thread()
2344 	struct worker *rescuer = __rescuer;  in rescuer_thread()
2472 	struct worker *worker;  in check_flush_dependency()  local
2477 	worker = current_wq_worker();  in check_flush_dependency()
2482 	WARN_ONCE(worker && ((worker->current_pwq->wq->flags &  in check_flush_dependency()
2485 		  worker->current_pwq->wq->name, worker->current_func,  in check_flush_dependency()
2527 			      struct work_struct *target, struct worker *worker)  in insert_wq_barrier()  argument
2549 	if (worker)  in insert_wq_barrier()
2550 		head = worker->scheduled.next;  in insert_wq_barrier()
2852 	struct worker *worker = NULL;  in start_flush_work()  local
2872 		worker = find_worker_executing_work(pool, work);  in start_flush_work()
2873 		if (!worker)  in start_flush_work()
2875 		pwq = worker->current_pwq;  in start_flush_work()
2880 	insert_wq_barrier(pwq, barr, work, worker);  in start_flush_work()
3354 	struct worker *worker;  in put_unbound_pool()  local
3381 	while ((worker = first_idle_worker(pool)))  in put_unbound_pool()
3382 		destroy_worker(worker);  in put_unbound_pool()
4022 	struct worker *rescuer;  in init_rescuer()
4264 	struct worker *worker = current_wq_worker();  in current_work()  local
4266 	return worker ? worker->current_work : NULL;  in current_work()
4280 	struct worker *worker = current_wq_worker();  in current_is_workqueue_rescuer()  local
4282 	return worker && worker->rescue_wq;  in current_is_workqueue_rescuer()
4371 	struct worker *worker = current_wq_worker();  in set_worker_desc()  local
4374 	if (worker) {  in set_worker_desc()
4376 		vsnprintf(worker->desc, sizeof(worker->desc), fmt, args);  in set_worker_desc()
4402 	struct worker *worker;  in print_worker_info()  local
4411 	worker = kthread_probe_data(task);  in print_worker_info()
4417 	probe_kernel_read(&fn, &worker->current_func, sizeof(fn));  in print_worker_info()
4418 	probe_kernel_read(&pwq, &worker->current_pwq, sizeof(pwq));  in print_worker_info()
4421 	probe_kernel_read(desc, worker->desc, sizeof(desc) - 1);  in print_worker_info()
4457 	struct worker *worker;  in show_pwq()  local
4467 	hash_for_each(pool->busy_hash, bkt, worker, hentry) {  in show_pwq()
4468 		if (worker->current_pwq == pwq) {  in show_pwq()
4477 		hash_for_each(pool->busy_hash, bkt, worker, hentry) {  in show_pwq()
4478 			if (worker->current_pwq != pwq)  in show_pwq()
4482 				task_pid_nr(worker->task),  in show_pwq()
4483 				worker == pwq->wq->rescuer ? "(RESCUER)" : "",  in show_pwq()
4484 				worker->current_func);  in show_pwq()
4485 			list_for_each_entry(work, &worker->scheduled, entry)  in show_pwq()
4571 		struct worker *worker;  in show_workqueue_state()  local
4586 		list_for_each_entry(worker, &pool->idle_list, entry) {  in show_workqueue_state()
4588 				task_pid_nr(worker->task));  in show_workqueue_state()
4619 		struct worker *worker = kthread_data(task);  in wq_worker_comm()  local
4620 		struct worker_pool *pool = worker->pool;  in wq_worker_comm()
4629 			if (worker->desc[0] != '\0') {  in wq_worker_comm()
4630 				if (worker->current_work)  in wq_worker_comm()
4632 						  worker->desc);  in wq_worker_comm()
4635 						  worker->desc);  in wq_worker_comm()
4664 	struct worker *worker;  in unbind_workers()  local
4677 		for_each_pool_worker(worker, pool)  in unbind_workers()
4678 			worker->flags |= WORKER_UNBOUND;  in unbind_workers()
4722 	struct worker *worker;  in rebind_workers()  local
4733 	for_each_pool_worker(worker, pool)  in rebind_workers()
4734 		WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task,  in rebind_workers()
4741 	for_each_pool_worker(worker, pool) {  in rebind_workers()
4742 		unsigned int worker_flags = worker->flags;  in rebind_workers()
4753 			wake_up_process(worker->task);  in rebind_workers()
4773 		WRITE_ONCE(worker->flags, worker_flags);  in rebind_workers()
4792 	struct worker *worker;  in restore_unbound_workers_cpumask()  local
4803 	for_each_pool_worker(worker, pool)  in restore_unbound_workers_cpumask()
4804 		WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task, &cpumask) < 0);  in restore_unbound_workers_cpumask()