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
,
71 WORK_OFFQ_CANCELING
= (1 << __WORK_OFFQ_CANCELING
),
74 * When a work item is off queue, its high bits point to the last
75 * pool it was on. Cap at 31 bits and use the highest number to
76 * indicate that no pool is associated.
78 WORK_OFFQ_FLAG_BITS
= 1,
79 WORK_OFFQ_POOL_SHIFT
= WORK_OFFQ_FLAG_BASE
+ WORK_OFFQ_FLAG_BITS
,
80 WORK_OFFQ_LEFT
= BITS_PER_LONG
- WORK_OFFQ_POOL_SHIFT
,
81 WORK_OFFQ_POOL_BITS
= WORK_OFFQ_LEFT
<= 31 ? WORK_OFFQ_LEFT
: 31,
82 WORK_OFFQ_POOL_NONE
= (1LU << WORK_OFFQ_POOL_BITS
) - 1,
84 /* convenience constants */
85 WORK_STRUCT_FLAG_MASK
= (1UL << WORK_STRUCT_FLAG_BITS
) - 1,
86 WORK_STRUCT_WQ_DATA_MASK
= ~WORK_STRUCT_FLAG_MASK
,
87 WORK_STRUCT_NO_POOL
= (unsigned long)WORK_OFFQ_POOL_NONE
<< WORK_OFFQ_POOL_SHIFT
,
89 /* bit mask for work_busy() return values */
90 WORK_BUSY_PENDING
= 1 << 0,
91 WORK_BUSY_RUNNING
= 1 << 1,
93 /* maximum string length for set_worker_desc() */
99 struct list_head entry
;
101 #ifdef CONFIG_LOCKDEP
102 struct lockdep_map lockdep_map
;
106 #define WORK_DATA_INIT() ATOMIC_LONG_INIT((unsigned long)WORK_STRUCT_NO_POOL)
107 #define WORK_DATA_STATIC_INIT() \
108 ATOMIC_LONG_INIT((unsigned long)(WORK_STRUCT_NO_POOL | WORK_STRUCT_STATIC))
110 struct delayed_work
{
111 struct work_struct work
;
112 struct timer_list timer
;
114 /* target workqueue and CPU ->timer uses to queue ->work */
115 struct workqueue_struct
*wq
;
120 struct work_struct work
;
123 /* target workqueue ->rcu uses to queue ->work */
124 struct workqueue_struct
*wq
;
128 * struct workqueue_attrs - A struct for workqueue attributes.
130 * This can be used to change attributes of an unbound workqueue.
132 struct workqueue_attrs
{
139 * @cpumask: allowed CPUs
141 cpumask_var_t cpumask
;
144 * @no_numa: disable NUMA affinity
146 * Unlike other fields, ``no_numa`` isn't a property of a worker_pool. It
147 * only modifies how :c:func:`apply_workqueue_attrs` select pools and thus
148 * doesn't participate in pool hash calculations or equality comparisons.
153 static inline struct delayed_work
*to_delayed_work(struct work_struct
*work
)
155 return container_of(work
, struct delayed_work
, work
);
158 static inline struct rcu_work
*to_rcu_work(struct work_struct
*work
)
160 return container_of(work
, struct rcu_work
, work
);
163 struct execute_work
{
164 struct work_struct work
;
167 #ifdef CONFIG_LOCKDEP
169 * NB: because we have to copy the lockdep_map, setting _key
170 * here is required, otherwise it could get initialised to the
171 * copy of the lockdep_map!
173 #define __WORK_INIT_LOCKDEP_MAP(n, k) \
174 .lockdep_map = STATIC_LOCKDEP_MAP_INIT(n, k),
176 #define __WORK_INIT_LOCKDEP_MAP(n, k)
179 #define __WORK_INITIALIZER(n, f) { \
180 .data = WORK_DATA_STATIC_INIT(), \
181 .entry = { &(n).entry, &(n).entry }, \
183 __WORK_INIT_LOCKDEP_MAP(#n, &(n)) \
186 #define __DELAYED_WORK_INITIALIZER(n, f, tflags) { \
187 .work = __WORK_INITIALIZER((n).work, (f)), \
188 .timer = __TIMER_INITIALIZER(delayed_work_timer_fn,\
189 (tflags) | TIMER_IRQSAFE), \
192 #define DECLARE_WORK(n, f) \
193 struct work_struct n = __WORK_INITIALIZER(n, f)
195 #define DECLARE_DELAYED_WORK(n, f) \
196 struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f, 0)
198 #define DECLARE_DEFERRABLE_WORK(n, f) \
199 struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f, TIMER_DEFERRABLE)
201 #ifdef CONFIG_DEBUG_OBJECTS_WORK
202 extern void __init_work(struct work_struct
*work
, int onstack
);
203 extern void destroy_work_on_stack(struct work_struct
*work
);
204 extern void destroy_delayed_work_on_stack(struct delayed_work
*work
);
205 static inline unsigned int work_static(struct work_struct
*work
)
207 return *work_data_bits(work
) & WORK_STRUCT_STATIC
;
210 static inline void __init_work(struct work_struct
*work
, int onstack
) { }
211 static inline void destroy_work_on_stack(struct work_struct
*work
) { }
212 static inline void destroy_delayed_work_on_stack(struct delayed_work
*work
) { }
213 static inline unsigned int work_static(struct work_struct
*work
) { return 0; }
217 * initialize all of a work item in one go
219 * NOTE! No point in using "atomic_long_set()": using a direct
220 * assignment of the work data initializer allows the compiler
221 * to generate better code.
223 #ifdef CONFIG_LOCKDEP
224 #define __INIT_WORK(_work, _func, _onstack) \
226 static struct lock_class_key __key; \
228 __init_work((_work), _onstack); \
229 (_work)->data = (atomic_long_t) WORK_DATA_INIT(); \
230 lockdep_init_map(&(_work)->lockdep_map, "(work_completion)"#_work, &__key, 0); \
231 INIT_LIST_HEAD(&(_work)->entry); \
232 (_work)->func = (_func); \
235 #define __INIT_WORK(_work, _func, _onstack) \
237 __init_work((_work), _onstack); \
238 (_work)->data = (atomic_long_t) WORK_DATA_INIT(); \
239 INIT_LIST_HEAD(&(_work)->entry); \
240 (_work)->func = (_func); \
244 #define INIT_WORK(_work, _func) \
245 __INIT_WORK((_work), (_func), 0)
247 #define INIT_WORK_ONSTACK(_work, _func) \
248 __INIT_WORK((_work), (_func), 1)
250 #define __INIT_DELAYED_WORK(_work, _func, _tflags) \
252 INIT_WORK(&(_work)->work, (_func)); \
253 __init_timer(&(_work)->timer, \
254 delayed_work_timer_fn, \
255 (_tflags) | TIMER_IRQSAFE); \
258 #define __INIT_DELAYED_WORK_ONSTACK(_work, _func, _tflags) \
260 INIT_WORK_ONSTACK(&(_work)->work, (_func)); \
261 __init_timer_on_stack(&(_work)->timer, \
262 delayed_work_timer_fn, \
263 (_tflags) | TIMER_IRQSAFE); \
266 #define INIT_DELAYED_WORK(_work, _func) \
267 __INIT_DELAYED_WORK(_work, _func, 0)
269 #define INIT_DELAYED_WORK_ONSTACK(_work, _func) \
270 __INIT_DELAYED_WORK_ONSTACK(_work, _func, 0)
272 #define INIT_DEFERRABLE_WORK(_work, _func) \
273 __INIT_DELAYED_WORK(_work, _func, TIMER_DEFERRABLE)
275 #define INIT_DEFERRABLE_WORK_ONSTACK(_work, _func) \
276 __INIT_DELAYED_WORK_ONSTACK(_work, _func, TIMER_DEFERRABLE)
278 #define INIT_RCU_WORK(_work, _func) \
279 INIT_WORK(&(_work)->work, (_func))
281 #define INIT_RCU_WORK_ONSTACK(_work, _func) \
282 INIT_WORK_ONSTACK(&(_work)->work, (_func))
285 * work_pending - Find out whether a work item is currently pending
286 * @work: The work item in question
288 #define work_pending(work) \
289 test_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))
292 * delayed_work_pending - Find out whether a delayable work item is currently
294 * @w: The work item in question
296 #define delayed_work_pending(w) \
297 work_pending(&(w)->work)
300 * Workqueue flags and constants. For details, please refer to
301 * Documentation/core-api/workqueue.rst.
304 WQ_UNBOUND
= 1 << 1, /* not bound to any cpu */
305 WQ_FREEZABLE
= 1 << 2, /* freeze during suspend */
306 WQ_MEM_RECLAIM
= 1 << 3, /* may be used for memory reclaim */
307 WQ_HIGHPRI
= 1 << 4, /* high priority */
308 WQ_CPU_INTENSIVE
= 1 << 5, /* cpu intensive workqueue */
309 WQ_SYSFS
= 1 << 6, /* visible in sysfs, see workqueue_sysfs_register() */
312 * Per-cpu workqueues are generally preferred because they tend to
313 * show better performance thanks to cache locality. Per-cpu
314 * workqueues exclude the scheduler from choosing the CPU to
315 * execute the worker threads, which has an unfortunate side effect
316 * of increasing power consumption.
318 * The scheduler considers a CPU idle if it doesn't have any task
319 * to execute and tries to keep idle cores idle to conserve power;
320 * however, for example, a per-cpu work item scheduled from an
321 * interrupt handler on an idle CPU will force the scheduler to
322 * execute the work item on that CPU breaking the idleness, which in
323 * turn may lead to more scheduling choices which are sub-optimal
324 * in terms of power consumption.
326 * Workqueues marked with WQ_POWER_EFFICIENT are per-cpu by default
327 * but become unbound if workqueue.power_efficient kernel param is
328 * specified. Per-cpu workqueues which are identified to
329 * contribute significantly to power-consumption are identified and
330 * marked with this flag and enabling the power_efficient mode
331 * leads to noticeable power saving at the cost of small
332 * performance disadvantage.
334 * http://thread.gmane.org/gmane.linux.kernel/1480396
336 WQ_POWER_EFFICIENT
= 1 << 7,
338 __WQ_DRAINING
= 1 << 16, /* internal: workqueue is draining */
339 __WQ_ORDERED
= 1 << 17, /* internal: workqueue is ordered */
340 __WQ_LEGACY
= 1 << 18, /* internal: create*_workqueue() */
341 __WQ_ORDERED_EXPLICIT
= 1 << 19, /* internal: alloc_ordered_workqueue() */
343 WQ_MAX_ACTIVE
= 512, /* I like 512, better ideas? */
344 WQ_MAX_UNBOUND_PER_CPU
= 4, /* 4 * #cpus for unbound wq */
345 WQ_DFL_ACTIVE
= WQ_MAX_ACTIVE
/ 2,
348 /* unbound wq's aren't per-cpu, scale max_active according to #cpus */
349 #define WQ_UNBOUND_MAX_ACTIVE \
350 max_t(int, WQ_MAX_ACTIVE, num_possible_cpus() * WQ_MAX_UNBOUND_PER_CPU)
353 * System-wide workqueues which are always present.
355 * system_wq is the one used by schedule[_delayed]_work[_on]().
356 * Multi-CPU multi-threaded. There are users which expect relatively
357 * short queue flush time. Don't queue works which can run for too
360 * system_highpri_wq is similar to system_wq but for work items which
361 * require WQ_HIGHPRI.
363 * system_long_wq is similar to system_wq but may host long running
364 * works. Queue flushing might take relatively long.
366 * system_unbound_wq is unbound workqueue. Workers are not bound to
367 * any specific CPU, not concurrency managed, and all queued works are
368 * executed immediately as long as max_active limit is not reached and
369 * resources are available.
371 * system_freezable_wq is equivalent to system_wq except that it's
374 * *_power_efficient_wq are inclined towards saving power and converted
375 * into WQ_UNBOUND variants if 'wq_power_efficient' is enabled; otherwise,
376 * they are same as their non-power-efficient counterparts - e.g.
377 * system_power_efficient_wq is identical to system_wq if
378 * 'wq_power_efficient' is disabled. See WQ_POWER_EFFICIENT for more info.
380 extern struct workqueue_struct
*system_wq
;
381 extern struct workqueue_struct
*system_highpri_wq
;
382 extern struct workqueue_struct
*system_long_wq
;
383 extern struct workqueue_struct
*system_unbound_wq
;
384 extern struct workqueue_struct
*system_freezable_wq
;
385 extern struct workqueue_struct
*system_power_efficient_wq
;
386 extern struct workqueue_struct
*system_freezable_power_efficient_wq
;
389 * alloc_workqueue - allocate a workqueue
390 * @fmt: printf format for the name of the workqueue
392 * @max_active: max in-flight work items, 0 for default
393 * remaining args: args for @fmt
395 * Allocate a workqueue with the specified parameters. For detailed
396 * information on WQ_* flags, please refer to
397 * Documentation/core-api/workqueue.rst.
400 * Pointer to the allocated workqueue on success, %NULL on failure.
402 struct workqueue_struct
*alloc_workqueue(const char *fmt
,
404 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_workqueue_state(void);
474 extern void wq_worker_comm(char *buf
, size_t size
, struct task_struct
*task
);
477 * queue_work - queue work on a workqueue
478 * @wq: workqueue to use
479 * @work: work to queue
481 * Returns %false if @work was already on a queue, %true otherwise.
483 * We queue the work to the CPU on which it was submitted, but if the CPU dies
484 * it can be processed by another CPU.
486 * Memory-ordering properties: If it returns %true, guarantees that all stores
487 * preceding the call to queue_work() in the program order will be visible from
488 * the CPU which will execute @work by the time such work executes, e.g.,
490 * { x is initially 0 }
494 * WRITE_ONCE(x, 1); [ @work is being executed ]
495 * r0 = queue_work(wq, work); r1 = READ_ONCE(x);
497 * Forbids: r0 == true && r1 == 0
499 static inline bool queue_work(struct workqueue_struct
*wq
,
500 struct work_struct
*work
)
502 return queue_work_on(WORK_CPU_UNBOUND
, wq
, work
);
506 * queue_delayed_work - queue work on a workqueue after delay
507 * @wq: workqueue to use
508 * @dwork: delayable work to queue
509 * @delay: number of jiffies to wait before queueing
511 * Equivalent to queue_delayed_work_on() but tries to use the local CPU.
513 static inline bool queue_delayed_work(struct workqueue_struct
*wq
,
514 struct delayed_work
*dwork
,
517 return queue_delayed_work_on(WORK_CPU_UNBOUND
, wq
, dwork
, delay
);
521 * mod_delayed_work - modify delay of or queue a delayed work
522 * @wq: workqueue to use
523 * @dwork: work to queue
524 * @delay: number of jiffies to wait before queueing
526 * mod_delayed_work_on() on local CPU.
528 static inline bool mod_delayed_work(struct workqueue_struct
*wq
,
529 struct delayed_work
*dwork
,
532 return mod_delayed_work_on(WORK_CPU_UNBOUND
, wq
, dwork
, delay
);
536 * schedule_work_on - put work task on a specific cpu
537 * @cpu: cpu to put the work task on
538 * @work: job to be done
540 * This puts a job on a specific cpu
542 static inline bool schedule_work_on(int cpu
, struct work_struct
*work
)
544 return queue_work_on(cpu
, system_wq
, work
);
548 * schedule_work - put work task in global workqueue
549 * @work: job to be done
551 * Returns %false if @work was already on the kernel-global workqueue and
554 * This puts a job in the kernel-global workqueue if it was not already
555 * queued and leaves it in the same position on the kernel-global
556 * workqueue otherwise.
558 * Shares the same memory-ordering properties of queue_work(), cf. the
559 * DocBook header of queue_work().
561 static inline bool schedule_work(struct work_struct
*work
)
563 return queue_work(system_wq
, work
);
567 * flush_scheduled_work - ensure that any scheduled work has run to completion.
569 * Forces execution of the kernel-global workqueue and blocks until its
572 * Think twice before calling this function! It's very easy to get into
573 * trouble if you don't take great care. Either of the following situations
574 * will lead to deadlock:
576 * One of the work items currently on the workqueue needs to acquire
577 * a lock held by your code or its caller.
579 * Your code is running in the context of a work routine.
581 * They will be detected by lockdep when they occur, but the first might not
582 * occur very often. It depends on what work items are on the workqueue and
583 * what locks they need, which you have no control over.
585 * In most situations flushing the entire workqueue is overkill; you merely
586 * need to know that a particular work item isn't queued and isn't running.
587 * In such cases you should use cancel_delayed_work_sync() or
588 * cancel_work_sync() instead.
590 static inline void flush_scheduled_work(void)
592 flush_workqueue(system_wq
);
596 * schedule_delayed_work_on - queue work in global workqueue on CPU after delay
598 * @dwork: job to be done
599 * @delay: number of jiffies to wait
601 * After waiting for a given time this puts a job in the kernel-global
602 * workqueue on the specified CPU.
604 static inline bool schedule_delayed_work_on(int cpu
, struct delayed_work
*dwork
,
607 return queue_delayed_work_on(cpu
, system_wq
, dwork
, delay
);
611 * schedule_delayed_work - put work task in global workqueue after delay
612 * @dwork: job to be done
613 * @delay: number of jiffies to wait or 0 for immediate execution
615 * After waiting for a given time this puts a job in the kernel-global
618 static inline bool schedule_delayed_work(struct delayed_work
*dwork
,
621 return queue_delayed_work(system_wq
, dwork
, delay
);
625 static inline long work_on_cpu(int cpu
, long (*fn
)(void *), void *arg
)
629 static inline long work_on_cpu_safe(int cpu
, long (*fn
)(void *), void *arg
)
634 long work_on_cpu(int cpu
, long (*fn
)(void *), void *arg
);
635 long work_on_cpu_safe(int cpu
, long (*fn
)(void *), void *arg
);
636 #endif /* CONFIG_SMP */
638 #ifdef CONFIG_FREEZER
639 extern void freeze_workqueues_begin(void);
640 extern bool freeze_workqueues_busy(void);
641 extern void thaw_workqueues(void);
642 #endif /* CONFIG_FREEZER */
645 int workqueue_sysfs_register(struct workqueue_struct
*wq
);
646 #else /* CONFIG_SYSFS */
647 static inline int workqueue_sysfs_register(struct workqueue_struct
*wq
)
649 #endif /* CONFIG_SYSFS */
651 #ifdef CONFIG_WQ_WATCHDOG
652 void wq_watchdog_touch(int cpu
);
653 #else /* CONFIG_WQ_WATCHDOG */
654 static inline void wq_watchdog_touch(int cpu
) { }
655 #endif /* CONFIG_WQ_WATCHDOG */
658 int workqueue_prepare_cpu(unsigned int cpu
);
659 int workqueue_online_cpu(unsigned int cpu
);
660 int workqueue_offline_cpu(unsigned int cpu
);
663 void __init
workqueue_init_early(void);
664 void __init
workqueue_init(void);