1 /* SPDX-License-Identifier: GPL-2.0 */
3 * workqueue.h --- work queue handling for Linux.
6 #ifndef _LINUX_WORKQUEUE_H
7 #define _LINUX_WORKQUEUE_H
9 #include <linux/timer.h>
10 #include <linux/linkage.h>
11 #include <linux/bitops.h>
12 #include <linux/lockdep.h>
13 #include <linux/threads.h>
14 #include <linux/atomic.h>
15 #include <linux/cpumask.h>
16 #include <linux/rcupdate.h>
18 struct workqueue_struct;
21 typedef void (*work_func_t)(struct work_struct *work);
22 void delayed_work_timer_fn(struct timer_list *t);
25 * The first word is the work queue pointer and the flags rolled into
28 #define work_data_bits(work) ((unsigned long *)(&(work)->data))
31 WORK_STRUCT_PENDING_BIT = 0, /* work item is pending execution */
32 WORK_STRUCT_INACTIVE_BIT= 1, /* work item is inactive */
33 WORK_STRUCT_PWQ_BIT = 2, /* data points to pwq */
34 WORK_STRUCT_LINKED_BIT = 3, /* next work is linked to this one */
35 #ifdef CONFIG_DEBUG_OBJECTS_WORK
36 WORK_STRUCT_STATIC_BIT = 4, /* static initializer (debugobjects) */
37 WORK_STRUCT_COLOR_SHIFT = 5, /* color for workqueue flushing */
39 WORK_STRUCT_COLOR_SHIFT = 4, /* color for workqueue flushing */
42 WORK_STRUCT_COLOR_BITS = 4,
44 WORK_STRUCT_PENDING = 1 << WORK_STRUCT_PENDING_BIT,
45 WORK_STRUCT_INACTIVE = 1 << WORK_STRUCT_INACTIVE_BIT,
46 WORK_STRUCT_PWQ = 1 << WORK_STRUCT_PWQ_BIT,
47 WORK_STRUCT_LINKED = 1 << WORK_STRUCT_LINKED_BIT,
48 #ifdef CONFIG_DEBUG_OBJECTS_WORK
49 WORK_STRUCT_STATIC = 1 << WORK_STRUCT_STATIC_BIT,
51 WORK_STRUCT_STATIC = 0,
54 WORK_NR_COLORS = (1 << WORK_STRUCT_COLOR_BITS),
56 /* not bound to any CPU, prefer the local CPU */
57 WORK_CPU_UNBOUND = NR_CPUS,
60 * Reserve 8 bits off of pwq pointer w/ debugobjects turned off.
61 * This makes pwqs aligned to 256 bytes and allows 16 workqueue
64 WORK_STRUCT_FLAG_BITS = WORK_STRUCT_COLOR_SHIFT +
65 WORK_STRUCT_COLOR_BITS,
67 /* data contains off-queue information when !WORK_STRUCT_PWQ */
68 WORK_OFFQ_FLAG_BASE = WORK_STRUCT_COLOR_SHIFT,
70 __WORK_OFFQ_CANCELING = WORK_OFFQ_FLAG_BASE,
73 * When a work item is off queue, its high bits point to the last
74 * pool it was on. Cap at 31 bits and use the highest number to
75 * indicate that no pool is associated.
77 WORK_OFFQ_FLAG_BITS = 1,
78 WORK_OFFQ_POOL_SHIFT = WORK_OFFQ_FLAG_BASE + WORK_OFFQ_FLAG_BITS,
79 WORK_OFFQ_LEFT = BITS_PER_LONG - WORK_OFFQ_POOL_SHIFT,
80 WORK_OFFQ_POOL_BITS = WORK_OFFQ_LEFT <= 31 ? WORK_OFFQ_LEFT : 31,
82 /* bit mask for work_busy() return values */
83 WORK_BUSY_PENDING = 1 << 0,
84 WORK_BUSY_RUNNING = 1 << 1,
86 /* maximum string length for set_worker_desc() */
90 /* Convenience constants - of type 'unsigned long', not 'enum'! */
91 #define WORK_OFFQ_CANCELING (1ul << __WORK_OFFQ_CANCELING)
92 #define WORK_OFFQ_POOL_NONE ((1ul << WORK_OFFQ_POOL_BITS) - 1)
93 #define WORK_STRUCT_NO_POOL (WORK_OFFQ_POOL_NONE << WORK_OFFQ_POOL_SHIFT)
95 #define WORK_STRUCT_FLAG_MASK ((1ul << WORK_STRUCT_FLAG_BITS) - 1)
96 #define WORK_STRUCT_WQ_DATA_MASK (~WORK_STRUCT_FLAG_MASK)
100 struct list_head entry;
102 #ifdef CONFIG_LOCKDEP
103 struct lockdep_map lockdep_map;
107 #define WORK_DATA_INIT() ATOMIC_LONG_INIT((unsigned long)WORK_STRUCT_NO_POOL)
108 #define WORK_DATA_STATIC_INIT() \
109 ATOMIC_LONG_INIT((unsigned long)(WORK_STRUCT_NO_POOL | WORK_STRUCT_STATIC))
111 struct delayed_work {
112 struct work_struct work;
113 struct timer_list timer;
115 /* target workqueue and CPU ->timer uses to queue ->work */
116 struct workqueue_struct *wq;
121 struct work_struct work;
124 /* target workqueue ->rcu uses to queue ->work */
125 struct workqueue_struct *wq;
129 * struct workqueue_attrs - A struct for workqueue attributes.
131 * This can be used to change attributes of an unbound workqueue.
133 struct workqueue_attrs {
140 * @cpumask: allowed CPUs
142 cpumask_var_t cpumask;
145 * @no_numa: disable NUMA affinity
147 * Unlike other fields, ``no_numa`` isn't a property of a worker_pool. It
148 * only modifies how :c:func:`apply_workqueue_attrs` select pools and thus
149 * doesn't participate in pool hash calculations or equality comparisons.
154 static inline struct delayed_work *to_delayed_work(struct work_struct *work)
156 return container_of(work, struct delayed_work, work);
159 static inline struct rcu_work *to_rcu_work(struct work_struct *work)
161 return container_of(work, struct rcu_work, work);
164 struct execute_work {
165 struct work_struct work;
168 #ifdef CONFIG_LOCKDEP
170 * NB: because we have to copy the lockdep_map, setting _key
171 * here is required, otherwise it could get initialised to the
172 * copy of the lockdep_map!
174 #define __WORK_INIT_LOCKDEP_MAP(n, k) \
175 .lockdep_map = STATIC_LOCKDEP_MAP_INIT(n, k),
177 #define __WORK_INIT_LOCKDEP_MAP(n, k)
180 #define __WORK_INITIALIZER(n, f) { \
181 .data = WORK_DATA_STATIC_INIT(), \
182 .entry = { &(n).entry, &(n).entry }, \
184 __WORK_INIT_LOCKDEP_MAP(#n, &(n)) \
187 #define __DELAYED_WORK_INITIALIZER(n, f, tflags) { \
188 .work = __WORK_INITIALIZER((n).work, (f)), \
189 .timer = __TIMER_INITIALIZER(delayed_work_timer_fn,\
190 (tflags) | TIMER_IRQSAFE), \
193 #define DECLARE_WORK(n, f) \
194 struct work_struct n = __WORK_INITIALIZER(n, f)
196 #define DECLARE_DELAYED_WORK(n, f) \
197 struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f, 0)
199 #define DECLARE_DEFERRABLE_WORK(n, f) \
200 struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f, TIMER_DEFERRABLE)
202 #ifdef CONFIG_DEBUG_OBJECTS_WORK
203 extern void __init_work(struct work_struct *work, int onstack);
204 extern void destroy_work_on_stack(struct work_struct *work);
205 extern void destroy_delayed_work_on_stack(struct delayed_work *work);
206 static inline unsigned int work_static(struct work_struct *work)
208 return *work_data_bits(work) & WORK_STRUCT_STATIC;
211 static inline void __init_work(struct work_struct *work, int onstack) { }
212 static inline void destroy_work_on_stack(struct work_struct *work) { }
213 static inline void destroy_delayed_work_on_stack(struct delayed_work *work) { }
214 static inline unsigned int work_static(struct work_struct *work) { return 0; }
218 * initialize all of a work item in one go
220 * NOTE! No point in using "atomic_long_set()": using a direct
221 * assignment of the work data initializer allows the compiler
222 * to generate better code.
224 #ifdef CONFIG_LOCKDEP
225 #define __INIT_WORK(_work, _func, _onstack) \
227 static struct lock_class_key __key; \
229 __init_work((_work), _onstack); \
230 (_work)->data = (atomic_long_t) WORK_DATA_INIT(); \
231 lockdep_init_map(&(_work)->lockdep_map, "(work_completion)"#_work, &__key, 0); \
232 INIT_LIST_HEAD(&(_work)->entry); \
233 (_work)->func = (_func); \
236 #define __INIT_WORK(_work, _func, _onstack) \
238 __init_work((_work), _onstack); \
239 (_work)->data = (atomic_long_t) WORK_DATA_INIT(); \
240 INIT_LIST_HEAD(&(_work)->entry); \
241 (_work)->func = (_func); \
245 #define INIT_WORK(_work, _func) \
246 __INIT_WORK((_work), (_func), 0)
248 #define INIT_WORK_ONSTACK(_work, _func) \
249 __INIT_WORK((_work), (_func), 1)
251 #define __INIT_DELAYED_WORK(_work, _func, _tflags) \
253 INIT_WORK(&(_work)->work, (_func)); \
254 __init_timer(&(_work)->timer, \
255 delayed_work_timer_fn, \
256 (_tflags) | TIMER_IRQSAFE); \
259 #define __INIT_DELAYED_WORK_ONSTACK(_work, _func, _tflags) \
261 INIT_WORK_ONSTACK(&(_work)->work, (_func)); \
262 __init_timer_on_stack(&(_work)->timer, \
263 delayed_work_timer_fn, \
264 (_tflags) | TIMER_IRQSAFE); \
267 #define INIT_DELAYED_WORK(_work, _func) \
268 __INIT_DELAYED_WORK(_work, _func, 0)
270 #define INIT_DELAYED_WORK_ONSTACK(_work, _func) \
271 __INIT_DELAYED_WORK_ONSTACK(_work, _func, 0)
273 #define INIT_DEFERRABLE_WORK(_work, _func) \
274 __INIT_DELAYED_WORK(_work, _func, TIMER_DEFERRABLE)
276 #define INIT_DEFERRABLE_WORK_ONSTACK(_work, _func) \
277 __INIT_DELAYED_WORK_ONSTACK(_work, _func, TIMER_DEFERRABLE)
279 #define INIT_RCU_WORK(_work, _func) \
280 INIT_WORK(&(_work)->work, (_func))
282 #define INIT_RCU_WORK_ONSTACK(_work, _func) \
283 INIT_WORK_ONSTACK(&(_work)->work, (_func))
286 * work_pending - Find out whether a work item is currently pending
287 * @work: The work item in question
289 #define work_pending(work) \
290 test_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))
293 * delayed_work_pending - Find out whether a delayable work item is currently
295 * @w: The work item in question
297 #define delayed_work_pending(w) \
298 work_pending(&(w)->work)
301 * Workqueue flags and constants. For details, please refer to
302 * Documentation/core-api/workqueue.rst.
305 WQ_UNBOUND = 1 << 1, /* not bound to any cpu */
306 WQ_FREEZABLE = 1 << 2, /* freeze during suspend */
307 WQ_MEM_RECLAIM = 1 << 3, /* may be used for memory reclaim */
308 WQ_HIGHPRI = 1 << 4, /* high priority */
309 WQ_CPU_INTENSIVE = 1 << 5, /* cpu intensive workqueue */
310 WQ_SYSFS = 1 << 6, /* visible in sysfs, see workqueue_sysfs_register() */
313 * Per-cpu workqueues are generally preferred because they tend to
314 * show better performance thanks to cache locality. Per-cpu
315 * workqueues exclude the scheduler from choosing the CPU to
316 * execute the worker threads, which has an unfortunate side effect
317 * of increasing power consumption.
319 * The scheduler considers a CPU idle if it doesn't have any task
320 * to execute and tries to keep idle cores idle to conserve power;
321 * however, for example, a per-cpu work item scheduled from an
322 * interrupt handler on an idle CPU will force the scheduler to
323 * execute the work item on that CPU breaking the idleness, which in
324 * turn may lead to more scheduling choices which are sub-optimal
325 * in terms of power consumption.
327 * Workqueues marked with WQ_POWER_EFFICIENT are per-cpu by default
328 * but become unbound if workqueue.power_efficient kernel param is
329 * specified. Per-cpu workqueues which are identified to
330 * contribute significantly to power-consumption are identified and
331 * marked with this flag and enabling the power_efficient mode
332 * leads to noticeable power saving at the cost of small
333 * performance disadvantage.
335 * http://thread.gmane.org/gmane.linux.kernel/1480396
337 WQ_POWER_EFFICIENT = 1 << 7,
339 __WQ_DRAINING = 1 << 16, /* internal: workqueue is draining */
340 __WQ_ORDERED = 1 << 17, /* internal: workqueue is ordered */
341 __WQ_LEGACY = 1 << 18, /* internal: create*_workqueue() */
342 __WQ_ORDERED_EXPLICIT = 1 << 19, /* internal: alloc_ordered_workqueue() */
344 WQ_MAX_ACTIVE = 512, /* I like 512, better ideas? */
345 WQ_MAX_UNBOUND_PER_CPU = 4, /* 4 * #cpus for unbound wq */
346 WQ_DFL_ACTIVE = WQ_MAX_ACTIVE / 2,
349 /* unbound wq's aren't per-cpu, scale max_active according to #cpus */
350 #define WQ_UNBOUND_MAX_ACTIVE \
351 max_t(int, WQ_MAX_ACTIVE, num_possible_cpus() * WQ_MAX_UNBOUND_PER_CPU)
354 * System-wide workqueues which are always present.
356 * system_wq is the one used by schedule[_delayed]_work[_on]().
357 * Multi-CPU multi-threaded. There are users which expect relatively
358 * short queue flush time. Don't queue works which can run for too
361 * system_highpri_wq is similar to system_wq but for work items which
362 * require WQ_HIGHPRI.
364 * system_long_wq is similar to system_wq but may host long running
365 * works. Queue flushing might take relatively long.
367 * system_unbound_wq is unbound workqueue. Workers are not bound to
368 * any specific CPU, not concurrency managed, and all queued works are
369 * executed immediately as long as max_active limit is not reached and
370 * resources are available.
372 * system_freezable_wq is equivalent to system_wq except that it's
375 * *_power_efficient_wq are inclined towards saving power and converted
376 * into WQ_UNBOUND variants if 'wq_power_efficient' is enabled; otherwise,
377 * they are same as their non-power-efficient counterparts - e.g.
378 * system_power_efficient_wq is identical to system_wq if
379 * 'wq_power_efficient' is disabled. See WQ_POWER_EFFICIENT for more info.
381 extern struct workqueue_struct *system_wq;
382 extern struct workqueue_struct *system_highpri_wq;
383 extern struct workqueue_struct *system_long_wq;
384 extern struct workqueue_struct *system_unbound_wq;
385 extern struct workqueue_struct *system_freezable_wq;
386 extern struct workqueue_struct *system_power_efficient_wq;
387 extern struct workqueue_struct *system_freezable_power_efficient_wq;
390 * alloc_workqueue - allocate a workqueue
391 * @fmt: printf format for the name of the workqueue
393 * @max_active: max in-flight work items, 0 for default
394 * remaining args: args for @fmt
396 * Allocate a workqueue with the specified parameters. For detailed
397 * information on WQ_* flags, please refer to
398 * Documentation/core-api/workqueue.rst.
401 * Pointer to the allocated workqueue on success, %NULL on failure.
403 __printf(1, 4) struct workqueue_struct *
404 alloc_workqueue(const char *fmt, unsigned int flags, int max_active, ...);
407 * alloc_ordered_workqueue - allocate an ordered workqueue
408 * @fmt: printf format for the name of the workqueue
409 * @flags: WQ_* flags (only WQ_FREEZABLE and WQ_MEM_RECLAIM are meaningful)
410 * @args...: args for @fmt
412 * Allocate an ordered workqueue. An ordered workqueue executes at
413 * most one work item at any given time in the queued order. They are
414 * implemented as unbound workqueues with @max_active of one.
417 * Pointer to the allocated workqueue on success, %NULL on failure.
419 #define alloc_ordered_workqueue(fmt, flags, args...) \
420 alloc_workqueue(fmt, WQ_UNBOUND | __WQ_ORDERED | \
421 __WQ_ORDERED_EXPLICIT | (flags), 1, ##args)
423 #define create_workqueue(name) \
424 alloc_workqueue("%s", __WQ_LEGACY | WQ_MEM_RECLAIM, 1, (name))
425 #define create_freezable_workqueue(name) \
426 alloc_workqueue("%s", __WQ_LEGACY | WQ_FREEZABLE | WQ_UNBOUND | \
427 WQ_MEM_RECLAIM, 1, (name))
428 #define create_singlethread_workqueue(name) \
429 alloc_ordered_workqueue("%s", __WQ_LEGACY | WQ_MEM_RECLAIM, name)
431 extern void destroy_workqueue(struct workqueue_struct *wq);
433 struct workqueue_attrs *alloc_workqueue_attrs(void);
434 void free_workqueue_attrs(struct workqueue_attrs *attrs);
435 int apply_workqueue_attrs(struct workqueue_struct *wq,
436 const struct workqueue_attrs *attrs);
437 int workqueue_set_unbound_cpumask(cpumask_var_t cpumask);
439 extern bool queue_work_on(int cpu, struct workqueue_struct *wq,
440 struct work_struct *work);
441 extern bool queue_work_node(int node, struct workqueue_struct *wq,
442 struct work_struct *work);
443 extern bool queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
444 struct delayed_work *work, unsigned long delay);
445 extern bool mod_delayed_work_on(int cpu, struct workqueue_struct *wq,
446 struct delayed_work *dwork, unsigned long delay);
447 extern bool queue_rcu_work(struct workqueue_struct *wq, struct rcu_work *rwork);
449 extern void flush_workqueue(struct workqueue_struct *wq);
450 extern void drain_workqueue(struct workqueue_struct *wq);
452 extern int schedule_on_each_cpu(work_func_t func);
454 int execute_in_process_context(work_func_t fn, struct execute_work *);
456 extern bool flush_work(struct work_struct *work);
457 extern bool cancel_work_sync(struct work_struct *work);
459 extern bool flush_delayed_work(struct delayed_work *dwork);
460 extern bool cancel_delayed_work(struct delayed_work *dwork);
461 extern bool cancel_delayed_work_sync(struct delayed_work *dwork);
463 extern bool flush_rcu_work(struct rcu_work *rwork);
465 extern void workqueue_set_max_active(struct workqueue_struct *wq,
467 extern struct work_struct *current_work(void);
468 extern bool current_is_workqueue_rescuer(void);
469 extern bool workqueue_congested(int cpu, struct workqueue_struct *wq);
470 extern unsigned int work_busy(struct work_struct *work);
471 extern __printf(1, 2) void set_worker_desc(const char *fmt, ...);
472 extern void print_worker_info(const char *log_lvl, struct task_struct *task);
473 extern void show_all_workqueues(void);
474 extern void show_one_workqueue(struct workqueue_struct *wq);
475 extern void wq_worker_comm(char *buf, size_t size, struct task_struct *task);
478 * queue_work - queue work on a workqueue
479 * @wq: workqueue to use
480 * @work: work to queue
482 * Returns %false if @work was already on a queue, %true otherwise.
484 * We queue the work to the CPU on which it was submitted, but if the CPU dies
485 * it can be processed by another CPU.
487 * Memory-ordering properties: If it returns %true, guarantees that all stores
488 * preceding the call to queue_work() in the program order will be visible from
489 * the CPU which will execute @work by the time such work executes, e.g.,
491 * { x is initially 0 }
495 * WRITE_ONCE(x, 1); [ @work is being executed ]
496 * r0 = queue_work(wq, work); r1 = READ_ONCE(x);
498 * Forbids: r0 == true && r1 == 0
500 static inline bool queue_work(struct workqueue_struct *wq,
501 struct work_struct *work)
503 return queue_work_on(WORK_CPU_UNBOUND, wq, work);
507 * queue_delayed_work - queue work on a workqueue after delay
508 * @wq: workqueue to use
509 * @dwork: delayable work to queue
510 * @delay: number of jiffies to wait before queueing
512 * Equivalent to queue_delayed_work_on() but tries to use the local CPU.
514 static inline bool queue_delayed_work(struct workqueue_struct *wq,
515 struct delayed_work *dwork,
518 return queue_delayed_work_on(WORK_CPU_UNBOUND, wq, dwork, delay);
522 * mod_delayed_work - modify delay of or queue a delayed work
523 * @wq: workqueue to use
524 * @dwork: work to queue
525 * @delay: number of jiffies to wait before queueing
527 * mod_delayed_work_on() on local CPU.
529 static inline bool mod_delayed_work(struct workqueue_struct *wq,
530 struct delayed_work *dwork,
533 return mod_delayed_work_on(WORK_CPU_UNBOUND, wq, dwork, delay);
537 * schedule_work_on - put work task on a specific cpu
538 * @cpu: cpu to put the work task on
539 * @work: job to be done
541 * This puts a job on a specific cpu
543 static inline bool schedule_work_on(int cpu, struct work_struct *work)
545 return queue_work_on(cpu, system_wq, work);
549 * schedule_work - put work task in global workqueue
550 * @work: job to be done
552 * Returns %false if @work was already on the kernel-global workqueue and
555 * This puts a job in the kernel-global workqueue if it was not already
556 * queued and leaves it in the same position on the kernel-global
557 * workqueue otherwise.
559 * Shares the same memory-ordering properties of queue_work(), cf. the
560 * DocBook header of queue_work().
562 static inline bool schedule_work(struct work_struct *work)
564 return queue_work(system_wq, work);
568 * flush_scheduled_work - ensure that any scheduled work has run to completion.
570 * Forces execution of the kernel-global workqueue and blocks until its
573 * Think twice before calling this function! It's very easy to get into
574 * trouble if you don't take great care. Either of the following situations
575 * will lead to deadlock:
577 * One of the work items currently on the workqueue needs to acquire
578 * a lock held by your code or its caller.
580 * Your code is running in the context of a work routine.
582 * They will be detected by lockdep when they occur, but the first might not
583 * occur very often. It depends on what work items are on the workqueue and
584 * what locks they need, which you have no control over.
586 * In most situations flushing the entire workqueue is overkill; you merely
587 * need to know that a particular work item isn't queued and isn't running.
588 * In such cases you should use cancel_delayed_work_sync() or
589 * cancel_work_sync() instead.
591 static inline void flush_scheduled_work(void)
593 flush_workqueue(system_wq);
597 * schedule_delayed_work_on - queue work in global workqueue on CPU after delay
599 * @dwork: job to be done
600 * @delay: number of jiffies to wait
602 * After waiting for a given time this puts a job in the kernel-global
603 * workqueue on the specified CPU.
605 static inline bool schedule_delayed_work_on(int cpu, struct delayed_work *dwork,
608 return queue_delayed_work_on(cpu, system_wq, dwork, delay);
612 * schedule_delayed_work - put work task in global workqueue after delay
613 * @dwork: job to be done
614 * @delay: number of jiffies to wait or 0 for immediate execution
616 * After waiting for a given time this puts a job in the kernel-global
619 static inline bool schedule_delayed_work(struct delayed_work *dwork,
622 return queue_delayed_work(system_wq, dwork, delay);
626 static inline long work_on_cpu(int cpu, long (*fn)(void *), void *arg)
630 static inline long work_on_cpu_safe(int cpu, long (*fn)(void *), void *arg)
635 long work_on_cpu(int cpu, long (*fn)(void *), void *arg);
636 long work_on_cpu_safe(int cpu, long (*fn)(void *), void *arg);
637 #endif /* CONFIG_SMP */
639 #ifdef CONFIG_FREEZER
640 extern void freeze_workqueues_begin(void);
641 extern bool freeze_workqueues_busy(void);
642 extern void thaw_workqueues(void);
643 #endif /* CONFIG_FREEZER */
646 int workqueue_sysfs_register(struct workqueue_struct *wq);
647 #else /* CONFIG_SYSFS */
648 static inline int workqueue_sysfs_register(struct workqueue_struct *wq)
650 #endif /* CONFIG_SYSFS */
652 #ifdef CONFIG_WQ_WATCHDOG
653 void wq_watchdog_touch(int cpu);
654 #else /* CONFIG_WQ_WATCHDOG */
655 static inline void wq_watchdog_touch(int cpu) { }
656 #endif /* CONFIG_WQ_WATCHDOG */
659 int workqueue_prepare_cpu(unsigned int cpu);
660 int workqueue_online_cpu(unsigned int cpu);
661 int workqueue_offline_cpu(unsigned int cpu);
664 void __init workqueue_init_early(void);
665 void __init workqueue_init(void);