22  * pools for workqueues which are not bound to any specific CPU - the
342 	struct list_head	list;		/* PR: list of all workqueues */
379 	 * the workqueues list without grabbing wq_pool_mutex.
380 	 * This is used to dump all workqueues from sysrq.
391  * Each pod type describes how CPUs should be grouped for unbound workqueues.
445 static DEFINE_MUTEX(wq_pool_mutex);	/* protects pools and workqueues list */
451 static LIST_HEAD(workqueues);		/* PR: list of all workqueues */
1313  * workqueues as appropriate. To avoid flooding the console, each violating work
1565  * - %NULL for per-cpu workqueues as they don't need to use shared nr_active.
1822  * This function should only be called for ordered workqueues where only the
1944  * For unbound workqueues, this function may temporarily drop @pwq->pool->lock.
1955 	 * workqueues.  in pwq_dec_nr_active()
1998  * For unbound workqueues, this function may temporarily drop @pwq->pool->lock
2470 	 * This current implementation is specific to unbound workqueues.  in queue_work_node()
3272 	 * workqueues), so hiding them isn't a problem.  in process_one_work()
3380  * exception is work items which belong to workqueues with a rescuer which
3529  * workqueues which have works queued on the pool and let them process
3859 	 * BH and threaded workqueues need separate lockdep keys to avoid  in insert_wq_barrier()
4266 	 * For single threaded workqueues the deadlock happens when the work  in start_flush_work()
4268 	 * workqueues the deadlock happens when the rescuer stalls, blocking  in start_flush_work()
5411 	 * For initialized ordered workqueues, there should only be one pwq  in apply_wqattrs_prepare()
5455 	/* only unbound workqueues can change attributes */  in apply_workqueue_attrs_locked()
5512  * may execute on any CPU. This is similar to how per-cpu workqueues behave on
5646  * Workqueues which may be used during memory reclaim should have a rescuer
5799 		 * BH workqueues always share a single execution context per CPU  in __alloc_workqueue()
5829 	 * wq_pool_mutex protects the workqueues list, allocations of PWQs,  in __alloc_workqueue()
5841 	list_add_tail_rcu(&wq->list, &workqueues);  in __alloc_workqueue()
6038 	/* max_active doesn't mean anything for BH workqueues */  in workqueue_set_max_active()
6041 	/* disallow meddling with max_active for ordered workqueues */  in workqueue_set_max_active()
6064  * Set min_active of an unbound workqueue. Unlike other types of workqueues, an
6075 	/* min_active is only meaningful for non-ordered unbound workqueues */  in workqueue_set_min_active()
6128  * With the exception of ordered workqueues, all workqueues have per-cpu
6503  * Called from a sysrq handler and prints out all busy workqueues and pools.
6513 	pr_info("Showing busy workqueues and worker pools:\n");  in show_all_workqueues()
6515 	list_for_each_entry_rcu(wq, &workqueues, list)  in show_all_workqueues()
6527  * Called from try_to_freeze_tasks() and prints out all freezable workqueues
6536 	pr_info("Showing freezable workqueues that are still busy:\n");  in show_freezable_workqueues()
6538 	list_for_each_entry_rcu(wq, &workqueues, list) {  in show_freezable_workqueues()
6769 	/* update pod affinity of unbound workqueues */  in workqueue_online_cpu()
6770 	list_for_each_entry(wq, &workqueues, list) {  in workqueue_online_cpu()
6800 	/* update pod affinity of unbound workqueues */  in workqueue_offline_cpu()
6805 	list_for_each_entry(wq, &workqueues, list) {  in workqueue_offline_cpu()
6868  * freeze_workqueues_begin - begin freezing workqueues
6870  * Start freezing workqueues.  After this function returns, all freezable
6871  * workqueues will queue new works to their inactive_works list instead of
6886 	list_for_each_entry(wq, &workqueues, list) {  in freeze_workqueues_begin()
6896  * freeze_workqueues_busy - are freezable workqueues still busy?
6905  * %true if some freezable workqueues are still busy.  %false if freezing
6918 	list_for_each_entry(wq, &workqueues, list) {  in freeze_workqueues_busy()
6942  * thaw_workqueues - thaw workqueues
6944  * Thaw workqueues.  Normal queueing is restored and all collected
6962 	list_for_each_entry(wq, &workqueues, list) {  in thaw_workqueues()
6982 	list_for_each_entry(wq, &workqueues, list) {  in workqueue_apply_unbound_cpumask()
7009 		list_for_each_entry(wq, &workqueues, list) {  in workqueue_apply_unbound_cpumask()
7094 	list_for_each_entry(wq, &workqueues, list) {  in wq_affn_dfl_set()
7119  * Workqueues with WQ_SYSFS flag set is visible to userland via
7120  * /sys/bus/workqueue/devices/WQ_NAME.  All visible workqueues have the
7126  * Unbound workqueues have the following extra attributes.
7364  *  The low-level workqueues cpumask is a global cpumask that limits
7365  *  the affinity of all unbound workqueues.  This function check the @cpumask
7366  *  and apply it to all unbound workqueues and updates all pwqs of them.
7487 	 * ordered workqueues.  in workqueue_sysfs_register()
7859  * up. It sets up all the data structures and system workqueues and allows early
7860  * boot code to create workqueues and queue/cancel work items. Actual work item
8015  * and invoked as soon as kthreads can be created and scheduled. Workqueues have
8032 	 * up. Also, create a rescuer for workqueues that requested it.  in workqueue_init()
8041 	list_for_each_entry(wq, &workqueues, list) {  in workqueue_init()
8136  * workqueue_init_topology - initialize CPU pods for unbound workqueues
8157 	 * Workqueues allocated earlier would have all CPUs sharing the default  in workqueue_init_topology()
8161 	list_for_each_entry(wq, &workqueues, list) {  in workqueue_init_topology()
8176 	pr_warn("WARNING: Flushing system-wide workqueues will be prohibited in near future.\n");  in __warn_flushing_systemwide_wq()