22  * pools for workqueues which are not bound to any specific CPU - the
339 	struct list_head	list;		/* PR: list of all workqueues */
376 	 * the workqueues list without grabbing wq_pool_mutex.
377 	 * This is used to dump all workqueues from sysrq.
388  * Each pod type describes how CPUs should be grouped for unbound workqueues.
442 static DEFINE_MUTEX(wq_pool_mutex);	/* protects pools and workqueues list */
448 static LIST_HEAD(workqueues);		/* PR: list of all workqueues */
1300  * workqueues as appropriate. To avoid flooding the console, each violating work
1552  * - %NULL for per-cpu workqueues as they don't need to use shared nr_active.
1809  * This function should only be called for ordered workqueues where only the
1931  * For unbound workqueues, this function may temporarily drop @pwq->pool->lock.
1942 	 * workqueues.  in pwq_dec_nr_active()
1985  * For unbound workqueues, this function may temporarily drop @pwq->pool->lock
2457 	 * This current implementation is specific to unbound workqueues.  in queue_work_node()
3259 	 * workqueues), so hiding them isn't a problem.  in process_one_work()
3367  * exception is work items which belong to workqueues with a rescuer which
3460  * workqueues which have works queued on the pool and let them process
3804 	 * BH and threaded workqueues need separate lockdep keys to avoid  in insert_wq_barrier()
4211 	 * For single threaded workqueues the deadlock happens when the work  in start_flush_work()
4213 	 * workqueues the deadlock happens when the rescuer stalls, blocking  in start_flush_work()
5343 	 * For initialized ordered workqueues, there should only be one pwq  in apply_wqattrs_prepare()
5392 	/* only unbound workqueues can change attributes */  in apply_workqueue_attrs_locked()
5449  * may execute on any CPU. This is similar to how per-cpu workqueues behave on
5583  * Workqueues which may be used during memory reclaim should have a rescuer
5733 		 * BH workqueues always share a single execution context per CPU  in __alloc_workqueue()
5763 	 * wq_pool_mutex protects the workqueues list, allocations of PWQs,  in __alloc_workqueue()
5775 	list_add_tail_rcu(&wq->list, &workqueues);  in __alloc_workqueue()
5978 	/* max_active doesn't mean anything for BH workqueues */  in workqueue_set_max_active()
5981 	/* disallow meddling with max_active for ordered workqueues */  in workqueue_set_max_active()
6004  * Set min_active of an unbound workqueue. Unlike other types of workqueues, an
6015 	/* min_active is only meaningful for non-ordered unbound workqueues */  in workqueue_set_min_active()
6068  * With the exception of ordered workqueues, all workqueues have per-cpu
6441  * Called from a sysrq handler and prints out all busy workqueues and pools.
6451 	pr_info("Showing busy workqueues and worker pools:\n");  in show_all_workqueues()
6453 	list_for_each_entry_rcu(wq, &workqueues, list)  in show_all_workqueues()
6465  * Called from try_to_freeze_tasks() and prints out all freezable workqueues
6474 	pr_info("Showing freezable workqueues that are still busy:\n");  in show_freezable_workqueues()
6476 	list_for_each_entry_rcu(wq, &workqueues, list) {  in show_freezable_workqueues()
6707 	/* update pod affinity of unbound workqueues */  in workqueue_online_cpu()
6708 	list_for_each_entry(wq, &workqueues, list) {  in workqueue_online_cpu()
6738 	/* update pod affinity of unbound workqueues */  in workqueue_offline_cpu()
6743 	list_for_each_entry(wq, &workqueues, list) {  in workqueue_offline_cpu()
6806  * freeze_workqueues_begin - begin freezing workqueues
6808  * Start freezing workqueues.  After this function returns, all freezable
6809  * workqueues will queue new works to their inactive_works list instead of
6824 	list_for_each_entry(wq, &workqueues, list) {  in freeze_workqueues_begin()
6834  * freeze_workqueues_busy - are freezable workqueues still busy?
6843  * %true if some freezable workqueues are still busy.  %false if freezing
6856 	list_for_each_entry(wq, &workqueues, list) {  in freeze_workqueues_busy()
6880  * thaw_workqueues - thaw workqueues
6882  * Thaw workqueues.  Normal queueing is restored and all collected
6900 	list_for_each_entry(wq, &workqueues, list) {  in thaw_workqueues()
6920 	list_for_each_entry(wq, &workqueues, list) {  in workqueue_apply_unbound_cpumask()
7011 	list_for_each_entry(wq, &workqueues, list) {  in wq_affn_dfl_set()
7036  * Workqueues with WQ_SYSFS flag set is visible to userland via
7037  * /sys/bus/workqueue/devices/WQ_NAME.  All visible workqueues have the
7043  * Unbound workqueues have the following extra attributes.
7281  *  The low-level workqueues cpumask is a global cpumask that limits
7282  *  the affinity of all unbound workqueues.  This function check the @cpumask
7283  *  and apply it to all unbound workqueues and updates all pwqs of them.
7404 	 * ordered workqueues.  in workqueue_sysfs_register()
7741  * up. It sets up all the data structures and system workqueues and allows early
7742  * boot code to create workqueues and queue/cancel work items. Actual work item
7897  * and invoked as soon as kthreads can be created and scheduled. Workqueues have
7914 	 * up. Also, create a rescuer for workqueues that requested it.  in workqueue_init()
7923 	list_for_each_entry(wq, &workqueues, list) {  in workqueue_init()
8018  * workqueue_init_topology - initialize CPU pods for unbound workqueues
8039 	 * Workqueues allocated earlier would have all CPUs sharing the default  in workqueue_init_topology()
8043 	list_for_each_entry(wq, &workqueues, list) {  in workqueue_init_topology()
8058 	pr_warn("WARNING: Flushing system-wide workqueues will be prohibited in near future.\n");  in __warn_flushing_systemwide_wq()