169 	struct worker		*manager;	/* L: purely informational */
251 	struct worker		*rescuer;	/* MD: rescue worker */
407 #define for_each_pool_worker(worker, pool)				\  argument
408 	list_for_each_entry((worker), &(pool)->workers, node)		\
815 static struct worker *first_idle_worker(struct worker_pool *pool)  in first_idle_worker()
820 	return list_first_entry(&pool->idle_list, struct worker, entry);  in first_idle_worker()
834 	struct worker *worker = first_idle_worker(pool);  in wake_up_worker()  local
836 	if (likely(worker))  in wake_up_worker()
837 		wake_up_process(worker->task);  in wake_up_worker()
848 	struct worker *worker = kthread_data(task);  in wq_worker_running()  local
850 	if (!worker->sleeping)  in wq_worker_running()
852 	if (!(worker->flags & WORKER_NOT_RUNNING))  in wq_worker_running()
853 		atomic_inc(&worker->pool->nr_running);  in wq_worker_running()
854 	worker->sleeping = 0;  in wq_worker_running()
867 	struct worker *next, *worker = kthread_data(task);  in wq_worker_sleeping()  local
875 	if (worker->flags & WORKER_NOT_RUNNING)  in wq_worker_sleeping()
878 	pool = worker->pool;  in wq_worker_sleeping()
881 	if (worker->sleeping)  in wq_worker_sleeping()
884 	worker->sleeping = 1;  in wq_worker_sleeping()
933 	struct worker *worker = kthread_data(task);  in wq_worker_last_func()  local
935 	return worker->last_func;  in wq_worker_last_func()
948 static inline void worker_set_flags(struct worker *worker, unsigned int flags)  in worker_set_flags()  argument
950 	struct worker_pool *pool = worker->pool;  in worker_set_flags()
952 	WARN_ON_ONCE(worker->task != current);  in worker_set_flags()
956 	    !(worker->flags & WORKER_NOT_RUNNING)) {  in worker_set_flags()
960 	worker->flags |= flags;  in worker_set_flags()
973 static inline void worker_clr_flags(struct worker *worker, unsigned int flags)  in worker_clr_flags()  argument
975 	struct worker_pool *pool = worker->pool;  in worker_clr_flags()
976 	unsigned int oflags = worker->flags;  in worker_clr_flags()
978 	WARN_ON_ONCE(worker->task != current);  in worker_clr_flags()
980 	worker->flags &= ~flags;  in worker_clr_flags()
988 		if (!(worker->flags & WORKER_NOT_RUNNING))  in worker_clr_flags()
1025 static struct worker *find_worker_executing_work(struct worker_pool *pool,  in find_worker_executing_work()
1028 	struct worker *worker;  in find_worker_executing_work()  local
1030 	hash_for_each_possible(pool->busy_hash, worker, hentry,  in find_worker_executing_work()
1032 		if (worker->current_work == work &&  in find_worker_executing_work()
1033 		    worker->current_func == work->func)  in find_worker_executing_work()
1034 			return worker;  in find_worker_executing_work()
1352 	struct worker *worker;  in is_chained_work()  local
1354 	worker = current_wq_worker();  in is_chained_work()
1359 	return worker && worker->current_pwq->wq == wq;  in is_chained_work()
1438 		struct worker *worker;  in __queue_work()  local
1442 		worker = find_worker_executing_work(last_pool, work);  in __queue_work()
1444 		if (worker && worker->current_pwq->wq == wq) {  in __queue_work()
1445 			pwq = worker->current_pwq;  in __queue_work()
1768 static void worker_enter_idle(struct worker *worker)  in worker_enter_idle()  argument
1770 	struct worker_pool *pool = worker->pool;  in worker_enter_idle()
1772 	if (WARN_ON_ONCE(worker->flags & WORKER_IDLE) ||  in worker_enter_idle()
1773 	    WARN_ON_ONCE(!list_empty(&worker->entry) &&  in worker_enter_idle()
1774 			 (worker->hentry.next || worker->hentry.pprev)))  in worker_enter_idle()
1778 	worker->flags |= WORKER_IDLE;  in worker_enter_idle()
1780 	worker->last_active = jiffies;  in worker_enter_idle()
1783 	list_add(&worker->entry, &pool->idle_list);  in worker_enter_idle()
1808 static void worker_leave_idle(struct worker *worker)  in worker_leave_idle()  argument
1810 	struct worker_pool *pool = worker->pool;  in worker_leave_idle()
1812 	if (WARN_ON_ONCE(!(worker->flags & WORKER_IDLE)))  in worker_leave_idle()
1814 	worker_clr_flags(worker, WORKER_IDLE);  in worker_leave_idle()
1816 	list_del_init(&worker->entry);  in worker_leave_idle()
1819 static struct worker *alloc_worker(int node)  in alloc_worker()
1821 	struct worker *worker;  in alloc_worker()  local
1823 	worker = kzalloc_node(sizeof(*worker), GFP_KERNEL, node);  in alloc_worker()
1824 	if (worker) {  in alloc_worker()
1825 		INIT_LIST_HEAD(&worker->entry);  in alloc_worker()
1826 		INIT_LIST_HEAD(&worker->scheduled);  in alloc_worker()
1827 		INIT_LIST_HEAD(&worker->node);  in alloc_worker()
1829 		worker->flags = WORKER_PREP;  in alloc_worker()
1831 	return worker;  in alloc_worker()
1843 static void worker_attach_to_pool(struct worker *worker,  in worker_attach_to_pool()  argument
1852 	set_cpus_allowed_ptr(worker->task, pool->attrs->cpumask);  in worker_attach_to_pool()
1860 		worker->flags |= WORKER_UNBOUND;  in worker_attach_to_pool()
1862 	list_add_tail(&worker->node, &pool->workers);  in worker_attach_to_pool()
1863 	worker->pool = pool;  in worker_attach_to_pool()
1876 static void worker_detach_from_pool(struct worker *worker)  in worker_detach_from_pool()  argument
1878 	struct worker_pool *pool = worker->pool;  in worker_detach_from_pool()
1883 	list_del(&worker->node);  in worker_detach_from_pool()
1884 	worker->pool = NULL;  in worker_detach_from_pool()
1891 	worker->flags &= ~(WORKER_UNBOUND | WORKER_REBOUND);  in worker_detach_from_pool()
1909 static struct worker *create_worker(struct worker_pool *pool)  in create_worker()
1911 	struct worker *worker = NULL;  in create_worker()  local
1920 	worker = alloc_worker(pool->node);  in create_worker()
1921 	if (!worker)  in create_worker()
1924 	worker->id = id;  in create_worker()
1932 	worker->task = kthread_create_on_node(worker_thread, worker, pool->node,  in create_worker()
1934 	if (IS_ERR(worker->task))  in create_worker()
1937 	set_user_nice(worker->task, pool->attrs->nice);  in create_worker()
1938 	kthread_bind_mask(worker->task, pool->attrs->cpumask);  in create_worker()
1941 	worker_attach_to_pool(worker, pool);  in create_worker()
1945 	worker->pool->nr_workers++;  in create_worker()
1946 	worker_enter_idle(worker);  in create_worker()
1947 	wake_up_process(worker->task);  in create_worker()
1950 	return worker;  in create_worker()
1955 	kfree(worker);  in create_worker()
1969 static void destroy_worker(struct worker *worker)  in destroy_worker()  argument
1971 	struct worker_pool *pool = worker->pool;  in destroy_worker()
1976 	if (WARN_ON(worker->current_work) ||  in destroy_worker()
1977 	    WARN_ON(!list_empty(&worker->scheduled)) ||  in destroy_worker()
1978 	    WARN_ON(!(worker->flags & WORKER_IDLE)))  in destroy_worker()
1984 	list_del_init(&worker->entry);  in destroy_worker()
1985 	worker->flags |= WORKER_DIE;  in destroy_worker()
1986 	wake_up_process(worker->task);  in destroy_worker()
1996 		struct worker *worker;  in idle_worker_timeout()  local
2000 		worker = list_entry(pool->idle_list.prev, struct worker, entry);  in idle_worker_timeout()
2001 		expires = worker->last_active + IDLE_WORKER_TIMEOUT;  in idle_worker_timeout()
2008 		destroy_worker(worker);  in idle_worker_timeout()
2133 static bool manage_workers(struct worker *worker)  in manage_workers()  argument
2135 	struct worker_pool *pool = worker->pool;  in manage_workers()
2141 	pool->manager = worker;  in manage_workers()
2165 static void process_one_work(struct worker *worker, struct work_struct *work)  in process_one_work()  argument
2170 	struct worker_pool *pool = worker->pool;  in process_one_work()
2173 	struct worker *collision;  in process_one_work()
2204 	hash_add(pool->busy_hash, &worker->hentry, (unsigned long)work);  in process_one_work()
2205 	worker->current_work = work;  in process_one_work()
2206 	worker->current_func = work->func;  in process_one_work()
2207 	worker->current_pwq = pwq;  in process_one_work()
2214 	strscpy(worker->desc, pwq->wq->name, WORKER_DESC_LEN);  in process_one_work()
2225 		worker_set_flags(worker, WORKER_CPU_INTENSIVE);  in process_one_work()
2272 	worker->current_func(work);  in process_one_work()
2277 	trace_workqueue_execute_end(work, worker->current_func);  in process_one_work()
2285 		       worker->current_func);  in process_one_work()
2304 		worker_clr_flags(worker, WORKER_CPU_INTENSIVE);  in process_one_work()
2307 	worker->last_func = worker->current_func;  in process_one_work()
2310 	hash_del(&worker->hentry);  in process_one_work()
2311 	worker->current_work = NULL;  in process_one_work()
2312 	worker->current_func = NULL;  in process_one_work()
2313 	worker->current_pwq = NULL;  in process_one_work()
2329 static void process_scheduled_works(struct worker *worker)  in process_scheduled_works()  argument
2331 	while (!list_empty(&worker->scheduled)) {  in process_scheduled_works()
2332 		struct work_struct *work = list_first_entry(&worker->scheduled,  in process_scheduled_works()
2334 		process_one_work(worker, work);  in process_scheduled_works()
2362 	struct worker *worker = __worker;  in worker_thread()  local
2363 	struct worker_pool *pool = worker->pool;  in worker_thread()
2371 	if (unlikely(worker->flags & WORKER_DIE)) {  in worker_thread()
2373 		WARN_ON_ONCE(!list_empty(&worker->entry));  in worker_thread()
2376 		set_task_comm(worker->task, "kworker/dying");  in worker_thread()
2377 		ida_simple_remove(&pool->worker_ida, worker->id);  in worker_thread()
2378 		worker_detach_from_pool(worker);  in worker_thread()
2379 		kfree(worker);  in worker_thread()
2383 	worker_leave_idle(worker);  in worker_thread()
2390 	if (unlikely(!may_start_working(pool)) && manage_workers(worker))  in worker_thread()
2398 	WARN_ON_ONCE(!list_empty(&worker->scheduled));  in worker_thread()
2407 	worker_clr_flags(worker, WORKER_PREP | WORKER_REBOUND);  in worker_thread()
2418 			process_one_work(worker, work);  in worker_thread()
2419 			if (unlikely(!list_empty(&worker->scheduled)))  in worker_thread()
2420 				process_scheduled_works(worker);  in worker_thread()
2422 			move_linked_works(work, &worker->scheduled, NULL);  in worker_thread()
2423 			process_scheduled_works(worker);  in worker_thread()
2427 	worker_set_flags(worker, WORKER_PREP);  in worker_thread()
2436 	worker_enter_idle(worker);  in worker_thread()
2466 	struct worker *rescuer = __rescuer;  in rescuer_thread()
2600 	struct worker *worker;  in check_flush_dependency()  local
2605 	worker = current_wq_worker();  in check_flush_dependency()
2610 	WARN_ONCE(worker && ((worker->current_pwq->wq->flags &  in check_flush_dependency()
2613 		  worker->current_pwq->wq->name, worker->current_func,  in check_flush_dependency()
2655 			      struct work_struct *target, struct worker *worker)  in insert_wq_barrier()  argument
2677 	if (worker)  in insert_wq_barrier()
2678 		head = worker->scheduled.next;  in insert_wq_barrier()
2980 	struct worker *worker = NULL;  in start_flush_work()  local
3000 		worker = find_worker_executing_work(pool, work);  in start_flush_work()
3001 		if (!worker)  in start_flush_work()
3003 		pwq = worker->current_pwq;  in start_flush_work()
3008 	insert_wq_barrier(pwq, barr, work, worker);  in start_flush_work()
3536 	struct worker *worker;  in put_unbound_pool()  local
3564 	while ((worker = first_idle_worker(pool)))  in put_unbound_pool()
3565 		destroy_worker(worker);  in put_unbound_pool()
4215 	struct worker *rescuer;  in init_rescuer()
4376 		struct worker *rescuer = wq->rescuer;  in destroy_workqueue()
4489 	struct worker *worker = current_wq_worker();  in current_work()  local
4491 	return worker ? worker->current_work : NULL;  in current_work()
4505 	struct worker *worker = current_wq_worker();  in current_is_workqueue_rescuer()  local
4507 	return worker && worker->rescue_wq;  in current_is_workqueue_rescuer()
4598 	struct worker *worker = current_wq_worker();  in set_worker_desc()  local
4601 	if (worker) {  in set_worker_desc()
4603 		vsnprintf(worker->desc, sizeof(worker->desc), fmt, args);  in set_worker_desc()
4629 	struct worker *worker;  in print_worker_info()  local
4638 	worker = kthread_probe_data(task);  in print_worker_info()
4644 	copy_from_kernel_nofault(&fn, &worker->current_func, sizeof(fn));  in print_worker_info()
4645 	copy_from_kernel_nofault(&pwq, &worker->current_pwq, sizeof(pwq));  in print_worker_info()
4648 	copy_from_kernel_nofault(desc, worker->desc, sizeof(desc) - 1);  in print_worker_info()
4684 	struct worker *worker;  in show_pwq()  local
4695 	hash_for_each(pool->busy_hash, bkt, worker, hentry) {  in show_pwq()
4696 		if (worker->current_pwq == pwq) {  in show_pwq()
4705 		hash_for_each(pool->busy_hash, bkt, worker, hentry) {  in show_pwq()
4706 			if (worker->current_pwq != pwq)  in show_pwq()
4710 				task_pid_nr(worker->task),  in show_pwq()
4711 				worker->rescue_wq ? "(RESCUER)" : "",  in show_pwq()
4712 				worker->current_func);  in show_pwq()
4713 			list_for_each_entry(work, &worker->scheduled, entry)  in show_pwq()
4799 		struct worker *worker;  in show_workqueue_state()  local
4814 		list_for_each_entry(worker, &pool->idle_list, entry) {  in show_workqueue_state()
4816 				task_pid_nr(worker->task));  in show_workqueue_state()
4847 		struct worker *worker = kthread_data(task);  in wq_worker_comm()  local
4848 		struct worker_pool *pool = worker->pool;  in wq_worker_comm()
4857 			if (worker->desc[0] != '\0') {  in wq_worker_comm()
4858 				if (worker->current_work)  in wq_worker_comm()
4860 						  worker->desc);  in wq_worker_comm()
4863 						  worker->desc);  in wq_worker_comm()
4892 	struct worker *worker;  in unbind_workers()  local
4905 		for_each_pool_worker(worker, pool)  in unbind_workers()
4906 			worker->flags |= WORKER_UNBOUND;  in unbind_workers()
4950 	struct worker *worker;  in rebind_workers()  local
4961 	for_each_pool_worker(worker, pool)  in rebind_workers()
4962 		WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task,  in rebind_workers()
4969 	for_each_pool_worker(worker, pool) {  in rebind_workers()
4970 		unsigned int worker_flags = worker->flags;  in rebind_workers()
4981 			wake_up_process(worker->task);  in rebind_workers()
5001 		WRITE_ONCE(worker->flags, worker_flags);  in rebind_workers()
5020 	struct worker *worker;  in restore_unbound_workers_cpumask()  local
5031 	for_each_pool_worker(worker, pool)  in restore_unbound_workers_cpumask()
5032 		WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task, &cpumask) < 0);  in restore_unbound_workers_cpumask()