169 	struct worker		*manager;	/* L: purely informational */
251 	struct worker		*rescuer;	/* I: rescue worker */
410 #define for_each_pool_worker(worker, pool)				\  argument
411 	list_for_each_entry((worker), &(pool)->workers, node)		\
819 static struct worker *first_idle_worker(struct worker_pool *pool)  in first_idle_worker()
824 	return list_first_entry(&pool->idle_list, struct worker, entry);  in first_idle_worker()
838 	struct worker *worker = first_idle_worker(pool);  in wake_up_worker()  local
840 	if (likely(worker))  in wake_up_worker()
841 		wake_up_process(worker->task);  in wake_up_worker()
852 	struct worker *worker = kthread_data(task);  in wq_worker_running()  local
854 	if (!worker->sleeping)  in wq_worker_running()
856 	if (!(worker->flags & WORKER_NOT_RUNNING))  in wq_worker_running()
857 		atomic_inc(&worker->pool->nr_running);  in wq_worker_running()
858 	worker->sleeping = 0;  in wq_worker_running()
870 	struct worker *next, *worker = kthread_data(task);  in wq_worker_sleeping()  local
878 	if (worker->flags & WORKER_NOT_RUNNING)  in wq_worker_sleeping()
881 	pool = worker->pool;  in wq_worker_sleeping()
883 	if (WARN_ON_ONCE(worker->sleeping))  in wq_worker_sleeping()
886 	worker->sleeping = 1;  in wq_worker_sleeping()
935 	struct worker *worker = kthread_data(task);  in wq_worker_last_func()  local
937 	return worker->last_func;  in wq_worker_last_func()
950 static inline void worker_set_flags(struct worker *worker, unsigned int flags)  in worker_set_flags()  argument
952 	struct worker_pool *pool = worker->pool;  in worker_set_flags()
954 	WARN_ON_ONCE(worker->task != current);  in worker_set_flags()
958 	    !(worker->flags & WORKER_NOT_RUNNING)) {  in worker_set_flags()
962 	worker->flags |= flags;  in worker_set_flags()
975 static inline void worker_clr_flags(struct worker *worker, unsigned int flags)  in worker_clr_flags()  argument
977 	struct worker_pool *pool = worker->pool;  in worker_clr_flags()
978 	unsigned int oflags = worker->flags;  in worker_clr_flags()
980 	WARN_ON_ONCE(worker->task != current);  in worker_clr_flags()
982 	worker->flags &= ~flags;  in worker_clr_flags()
990 		if (!(worker->flags & WORKER_NOT_RUNNING))  in worker_clr_flags()
1027 static struct worker *find_worker_executing_work(struct worker_pool *pool,  in find_worker_executing_work()
1030 	struct worker *worker;  in find_worker_executing_work()  local
1032 	hash_for_each_possible(pool->busy_hash, worker, hentry,  in find_worker_executing_work()
1034 		if (worker->current_work == work &&  in find_worker_executing_work()
1035 		    worker->current_func == work->func)  in find_worker_executing_work()
1036 			return worker;  in find_worker_executing_work()
1351 	struct worker *worker;  in is_chained_work()  local
1353 	worker = current_wq_worker();  in is_chained_work()
1358 	return worker && worker->current_pwq->wq == wq;  in is_chained_work()
1435 		struct worker *worker;  in __queue_work()  local
1439 		worker = find_worker_executing_work(last_pool, work);  in __queue_work()
1441 		if (worker && worker->current_pwq->wq == wq) {  in __queue_work()
1442 			pwq = worker->current_pwq;  in __queue_work()
1765 static void worker_enter_idle(struct worker *worker)  in worker_enter_idle()  argument
1767 	struct worker_pool *pool = worker->pool;  in worker_enter_idle()
1769 	if (WARN_ON_ONCE(worker->flags & WORKER_IDLE) ||  in worker_enter_idle()
1770 	    WARN_ON_ONCE(!list_empty(&worker->entry) &&  in worker_enter_idle()
1771 			 (worker->hentry.next || worker->hentry.pprev)))  in worker_enter_idle()
1775 	worker->flags |= WORKER_IDLE;  in worker_enter_idle()
1777 	worker->last_active = jiffies;  in worker_enter_idle()
1780 	list_add(&worker->entry, &pool->idle_list);  in worker_enter_idle()
1805 static void worker_leave_idle(struct worker *worker)  in worker_leave_idle()  argument
1807 	struct worker_pool *pool = worker->pool;  in worker_leave_idle()
1809 	if (WARN_ON_ONCE(!(worker->flags & WORKER_IDLE)))  in worker_leave_idle()
1811 	worker_clr_flags(worker, WORKER_IDLE);  in worker_leave_idle()
1813 	list_del_init(&worker->entry);  in worker_leave_idle()
1816 static struct worker *alloc_worker(int node)  in alloc_worker()
1818 	struct worker *worker;  in alloc_worker()  local
1820 	worker = kzalloc_node(sizeof(*worker), GFP_KERNEL, node);  in alloc_worker()
1821 	if (worker) {  in alloc_worker()
1822 		INIT_LIST_HEAD(&worker->entry);  in alloc_worker()
1823 		INIT_LIST_HEAD(&worker->scheduled);  in alloc_worker()
1824 		INIT_LIST_HEAD(&worker->node);  in alloc_worker()
1826 		worker->flags = WORKER_PREP;  in alloc_worker()
1828 	return worker;  in alloc_worker()
1840 static void worker_attach_to_pool(struct worker *worker,  in worker_attach_to_pool()  argument
1849 	set_cpus_allowed_ptr(worker->task, pool->attrs->cpumask);  in worker_attach_to_pool()
1857 		worker->flags |= WORKER_UNBOUND;  in worker_attach_to_pool()
1859 	list_add_tail(&worker->node, &pool->workers);  in worker_attach_to_pool()
1860 	worker->pool = pool;  in worker_attach_to_pool()
1873 static void worker_detach_from_pool(struct worker *worker)  in worker_detach_from_pool()  argument
1875 	struct worker_pool *pool = worker->pool;  in worker_detach_from_pool()
1880 	list_del(&worker->node);  in worker_detach_from_pool()
1881 	worker->pool = NULL;  in worker_detach_from_pool()
1888 	worker->flags &= ~(WORKER_UNBOUND | WORKER_REBOUND);  in worker_detach_from_pool()
1906 static struct worker *create_worker(struct worker_pool *pool)  in create_worker()
1908 	struct worker *worker = NULL;  in create_worker()  local
1917 	worker = alloc_worker(pool->node);  in create_worker()
1918 	if (!worker)  in create_worker()
1921 	worker->id = id;  in create_worker()
1929 	worker->task = kthread_create_on_node(worker_thread, worker, pool->node,  in create_worker()
1931 	if (IS_ERR(worker->task))  in create_worker()
1934 	set_user_nice(worker->task, pool->attrs->nice);  in create_worker()
1935 	kthread_bind_mask(worker->task, pool->attrs->cpumask);  in create_worker()
1938 	worker_attach_to_pool(worker, pool);  in create_worker()
1942 	worker->pool->nr_workers++;  in create_worker()
1943 	worker_enter_idle(worker);  in create_worker()
1944 	wake_up_process(worker->task);  in create_worker()
1947 	return worker;  in create_worker()
1952 	kfree(worker);  in create_worker()
1966 static void destroy_worker(struct worker *worker)  in destroy_worker()  argument
1968 	struct worker_pool *pool = worker->pool;  in destroy_worker()
1973 	if (WARN_ON(worker->current_work) ||  in destroy_worker()
1974 	    WARN_ON(!list_empty(&worker->scheduled)) ||  in destroy_worker()
1975 	    WARN_ON(!(worker->flags & WORKER_IDLE)))  in destroy_worker()
1981 	list_del_init(&worker->entry);  in destroy_worker()
1982 	worker->flags |= WORKER_DIE;  in destroy_worker()
1983 	wake_up_process(worker->task);  in destroy_worker()
1993 		struct worker *worker;  in idle_worker_timeout()  local
1997 		worker = list_entry(pool->idle_list.prev, struct worker, entry);  in idle_worker_timeout()
1998 		expires = worker->last_active + IDLE_WORKER_TIMEOUT;  in idle_worker_timeout()
2005 		destroy_worker(worker);  in idle_worker_timeout()
2130 static bool manage_workers(struct worker *worker)  in manage_workers()  argument
2132 	struct worker_pool *pool = worker->pool;  in manage_workers()
2138 	pool->manager = worker;  in manage_workers()
2162 static void process_one_work(struct worker *worker, struct work_struct *work)  in process_one_work()  argument
2167 	struct worker_pool *pool = worker->pool;  in process_one_work()
2170 	struct worker *collision;  in process_one_work()
2201 	hash_add(pool->busy_hash, &worker->hentry, (unsigned long)work);  in process_one_work()
2202 	worker->current_work = work;  in process_one_work()
2203 	worker->current_func = work->func;  in process_one_work()
2204 	worker->current_pwq = pwq;  in process_one_work()
2211 	strscpy(worker->desc, pwq->wq->name, WORKER_DESC_LEN);  in process_one_work()
2222 		worker_set_flags(worker, WORKER_CPU_INTENSIVE);  in process_one_work()
2269 	worker->current_func(work);  in process_one_work()
2282 		       worker->current_func);  in process_one_work()
2301 		worker_clr_flags(worker, WORKER_CPU_INTENSIVE);  in process_one_work()
2304 	worker->last_func = worker->current_func;  in process_one_work()
2307 	hash_del(&worker->hentry);  in process_one_work()
2308 	worker->current_work = NULL;  in process_one_work()
2309 	worker->current_func = NULL;  in process_one_work()
2310 	worker->current_pwq = NULL;  in process_one_work()
2326 static void process_scheduled_works(struct worker *worker)  in process_scheduled_works()  argument
2328 	while (!list_empty(&worker->scheduled)) {  in process_scheduled_works()
2329 		struct work_struct *work = list_first_entry(&worker->scheduled,  in process_scheduled_works()
2331 		process_one_work(worker, work);  in process_scheduled_works()
2359 	struct worker *worker = __worker;  in worker_thread()  local
2360 	struct worker_pool *pool = worker->pool;  in worker_thread()
2368 	if (unlikely(worker->flags & WORKER_DIE)) {  in worker_thread()
2370 		WARN_ON_ONCE(!list_empty(&worker->entry));  in worker_thread()
2373 		set_task_comm(worker->task, "kworker/dying");  in worker_thread()
2374 		ida_simple_remove(&pool->worker_ida, worker->id);  in worker_thread()
2375 		worker_detach_from_pool(worker);  in worker_thread()
2376 		kfree(worker);  in worker_thread()
2380 	worker_leave_idle(worker);  in worker_thread()
2387 	if (unlikely(!may_start_working(pool)) && manage_workers(worker))  in worker_thread()
2395 	WARN_ON_ONCE(!list_empty(&worker->scheduled));  in worker_thread()
2404 	worker_clr_flags(worker, WORKER_PREP | WORKER_REBOUND);  in worker_thread()
2415 			process_one_work(worker, work);  in worker_thread()
2416 			if (unlikely(!list_empty(&worker->scheduled)))  in worker_thread()
2417 				process_scheduled_works(worker);  in worker_thread()
2419 			move_linked_works(work, &worker->scheduled, NULL);  in worker_thread()
2420 			process_scheduled_works(worker);  in worker_thread()
2424 	worker_set_flags(worker, WORKER_PREP);  in worker_thread()
2433 	worker_enter_idle(worker);  in worker_thread()
2463 	struct worker *rescuer = __rescuer;  in rescuer_thread()
2591 	struct worker *worker;  in check_flush_dependency()  local
2596 	worker = current_wq_worker();  in check_flush_dependency()
2601 	WARN_ONCE(worker && ((worker->current_pwq->wq->flags &  in check_flush_dependency()
2604 		  worker->current_pwq->wq->name, worker->current_func,  in check_flush_dependency()
2646 			      struct work_struct *target, struct worker *worker)  in insert_wq_barrier()  argument
2668 	if (worker)  in insert_wq_barrier()
2669 		head = worker->scheduled.next;  in insert_wq_barrier()
2971 	struct worker *worker = NULL;  in start_flush_work()  local
2991 		worker = find_worker_executing_work(pool, work);  in start_flush_work()
2992 		if (!worker)  in start_flush_work()
2994 		pwq = worker->current_pwq;  in start_flush_work()
2999 	insert_wq_barrier(pwq, barr, work, worker);  in start_flush_work()
3516 	struct worker *worker;  in put_unbound_pool()  local
3543 	while ((worker = first_idle_worker(pool)))  in put_unbound_pool()
3544 		destroy_worker(worker);  in put_unbound_pool()
4194 	struct worker *rescuer;  in init_rescuer()
4439 	struct worker *worker = current_wq_worker();  in current_work()  local
4441 	return worker ? worker->current_work : NULL;  in current_work()
4455 	struct worker *worker = current_wq_worker();  in current_is_workqueue_rescuer()  local
4457 	return worker && worker->rescue_wq;  in current_is_workqueue_rescuer()
4548 	struct worker *worker = current_wq_worker();  in set_worker_desc()  local
4551 	if (worker) {  in set_worker_desc()
4553 		vsnprintf(worker->desc, sizeof(worker->desc), fmt, args);  in set_worker_desc()
4579 	struct worker *worker;  in print_worker_info()  local
4588 	worker = kthread_probe_data(task);  in print_worker_info()
4594 	probe_kernel_read(&fn, &worker->current_func, sizeof(fn));  in print_worker_info()
4595 	probe_kernel_read(&pwq, &worker->current_pwq, sizeof(pwq));  in print_worker_info()
4598 	probe_kernel_read(desc, worker->desc, sizeof(desc) - 1);  in print_worker_info()
4634 	struct worker *worker;  in show_pwq()  local
4644 	hash_for_each(pool->busy_hash, bkt, worker, hentry) {  in show_pwq()
4645 		if (worker->current_pwq == pwq) {  in show_pwq()
4654 		hash_for_each(pool->busy_hash, bkt, worker, hentry) {  in show_pwq()
4655 			if (worker->current_pwq != pwq)  in show_pwq()
4659 				task_pid_nr(worker->task),  in show_pwq()
4660 				worker == pwq->wq->rescuer ? "(RESCUER)" : "",  in show_pwq()
4661 				worker->current_func);  in show_pwq()
4662 			list_for_each_entry(work, &worker->scheduled, entry)  in show_pwq()
4748 		struct worker *worker;  in show_workqueue_state()  local
4763 		list_for_each_entry(worker, &pool->idle_list, entry) {  in show_workqueue_state()
4765 				task_pid_nr(worker->task));  in show_workqueue_state()
4796 		struct worker *worker = kthread_data(task);  in wq_worker_comm()  local
4797 		struct worker_pool *pool = worker->pool;  in wq_worker_comm()
4806 			if (worker->desc[0] != '\0') {  in wq_worker_comm()
4807 				if (worker->current_work)  in wq_worker_comm()
4809 						  worker->desc);  in wq_worker_comm()
4812 						  worker->desc);  in wq_worker_comm()
4841 	struct worker *worker;  in unbind_workers()  local
4854 		for_each_pool_worker(worker, pool)  in unbind_workers()
4855 			worker->flags |= WORKER_UNBOUND;  in unbind_workers()
4899 	struct worker *worker;  in rebind_workers()  local
4910 	for_each_pool_worker(worker, pool)  in rebind_workers()
4911 		WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task,  in rebind_workers()
4918 	for_each_pool_worker(worker, pool) {  in rebind_workers()
4919 		unsigned int worker_flags = worker->flags;  in rebind_workers()
4930 			wake_up_process(worker->task);  in rebind_workers()
4950 		WRITE_ONCE(worker->flags, worker_flags);  in rebind_workers()
4969 	struct worker *worker;  in restore_unbound_workers_cpumask()  local
4980 	for_each_pool_worker(worker, pool)  in restore_unbound_workers_cpumask()
4981 		WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task, &cpumask) < 0);  in restore_unbound_workers_cpumask()