22  * pools for workqueues which are not bound to any specific CPU - the
337 	struct list_head	list;		/* PR: list of all workqueues */
374 	 * the workqueues list without grabbing wq_pool_mutex.
375 	 * This is used to dump all workqueues from sysrq.
386  * Each pod type describes how CPUs should be grouped for unbound workqueues.
440 static DEFINE_MUTEX(wq_pool_mutex);	/* protects pools and workqueues list */
446 static LIST_HEAD(workqueues);		/* PR: list of all workqueues */
1294  * workqueues as appropriate. To avoid flooding the console, each violating work
1546  * - %NULL for per-cpu workqueues as they don't need to use shared nr_active.
1806  * This function should only be called for ordered workqueues where only the
1928  * For unbound workqueues, this function may temporarily drop @pwq->pool->lock.
1939 	 * workqueues.  in pwq_dec_nr_active()
1982  * For unbound workqueues, this function may temporarily drop @pwq->pool->lock
2457 	 * This current implementation is specific to unbound workqueues.  in queue_work_node()
3234 	 * workqueues), so hiding them isn't a problem.  in process_one_work()
3340  * exception is work items which belong to workqueues with a rescuer which
3433  * workqueues which have works queued on the pool and let them process
3775 	 * BH and threaded workqueues need separate lockdep keys to avoid  in insert_wq_barrier()
4182 	 * For single threaded workqueues the deadlock happens when the work  in start_flush_work()
4184 	 * workqueues the deadlock happens when the rescuer stalls, blocking  in start_flush_work()
5311 	 * For initialized ordered workqueues, there should only be one pwq  in apply_wqattrs_prepare()
5360 	/* only unbound workqueues can change attributes */  in apply_workqueue_attrs_locked()
5417  * may execute on any CPU. This is similar to how per-cpu workqueues behave on
5551  * Workqueues which may be used during memory reclaim should have a rescuer
5701 		 * BH workqueues always share a single execution context per CPU  in __alloc_workqueue()
5731 	 * wq_pool_mutex protects the workqueues list, allocations of PWQs,  in __alloc_workqueue()
5743 	list_add_tail_rcu(&wq->list, &workqueues);  in __alloc_workqueue()
5935 	/* max_active doesn't mean anything for BH workqueues */  in workqueue_set_max_active()
5938 	/* disallow meddling with max_active for ordered workqueues */  in workqueue_set_max_active()
5961  * Set min_active of an unbound workqueue. Unlike other types of workqueues, an
5972 	/* min_active is only meaningful for non-ordered unbound workqueues */  in workqueue_set_min_active()
6025  * With the exception of ordered workqueues, all workqueues have per-cpu
6400  * Called from a sysrq handler and prints out all busy workqueues and pools.
6410 	pr_info("Showing busy workqueues and worker pools:\n");  in show_all_workqueues()
6412 	list_for_each_entry_rcu(wq, &workqueues, list)  in show_all_workqueues()
6424  * Called from try_to_freeze_tasks() and prints out all freezable workqueues
6433 	pr_info("Showing freezable workqueues that are still busy:\n");  in show_freezable_workqueues()
6435 	list_for_each_entry_rcu(wq, &workqueues, list) {  in show_freezable_workqueues()
6666 	/* update pod affinity of unbound workqueues */  in workqueue_online_cpu()
6667 	list_for_each_entry(wq, &workqueues, list) {  in workqueue_online_cpu()
6697 	/* update pod affinity of unbound workqueues */  in workqueue_offline_cpu()
6702 	list_for_each_entry(wq, &workqueues, list) {  in workqueue_offline_cpu()
6790  * freeze_workqueues_begin - begin freezing workqueues
6792  * Start freezing workqueues.  After this function returns, all freezable
6793  * workqueues will queue new works to their inactive_works list instead of
6808 	list_for_each_entry(wq, &workqueues, list) {  in freeze_workqueues_begin()
6818  * freeze_workqueues_busy - are freezable workqueues still busy?
6827  * %true if some freezable workqueues are still busy.  %false if freezing
6840 	list_for_each_entry(wq, &workqueues, list) {  in freeze_workqueues_busy()
6864  * thaw_workqueues - thaw workqueues
6866  * Thaw workqueues.  Normal queueing is restored and all collected
6884 	list_for_each_entry(wq, &workqueues, list) {  in thaw_workqueues()
6904 	list_for_each_entry(wq, &workqueues, list) {  in workqueue_apply_unbound_cpumask()
6995 	list_for_each_entry(wq, &workqueues, list) {  in wq_affn_dfl_set()
7020  * Workqueues with WQ_SYSFS flag set is visible to userland via
7021  * /sys/bus/workqueue/devices/WQ_NAME.  All visible workqueues have the
7027  * Unbound workqueues have the following extra attributes.
7265  *  The low-level workqueues cpumask is a global cpumask that limits
7266  *  the affinity of all unbound workqueues.  This function check the @cpumask
7267  *  and apply it to all unbound workqueues and updates all pwqs of them.
7388 	 * ordered workqueues.  in workqueue_sysfs_register()
7729  * up. It sets up all the data structures and system workqueues and allows early
7730  * boot code to create workqueues and queue/cancel work items. Actual work item
7883  * and invoked as soon as kthreads can be created and scheduled. Workqueues have
7900 	 * up. Also, create a rescuer for workqueues that requested it.  in workqueue_init()
7909 	list_for_each_entry(wq, &workqueues, list) {  in workqueue_init()
8004  * workqueue_init_topology - initialize CPU pods for unbound workqueues
8025 	 * Workqueues allocated earlier would have all CPUs sharing the default  in workqueue_init_topology()
8029 	list_for_each_entry(wq, &workqueues, list) {  in workqueue_init_topology()
8044 	pr_warn("WARNING: Flushing system-wide workqueues will be prohibited in near future.\n");  in __warn_flushing_systemwide_wq()