Line data Source code
1 : /*
2 : * workqueue.h --- work queue handling for Linux.
3 : */
4 :
5 : #ifndef _LINUX_WORKQUEUE_H
6 : #define _LINUX_WORKQUEUE_H
7 :
8 : #include <linux/timer.h>
9 : #include <linux/linkage.h>
10 : #include <linux/bitops.h>
11 : #include <linux/lockdep.h>
12 : #include <linux/threads.h>
13 : #include <linux/atomic.h>
14 : #include <linux/cpumask.h>
15 :
16 : struct workqueue_struct;
17 :
18 : struct work_struct;
19 : typedef void (*work_func_t)(struct work_struct *work);
20 : void delayed_work_timer_fn(unsigned long __data);
21 :
22 : /*
23 : * The first word is the work queue pointer and the flags rolled into
24 : * one
25 : */
26 : #define work_data_bits(work) ((unsigned long *)(&(work)->data))
27 :
28 : enum {
29 : WORK_STRUCT_PENDING_BIT = 0, /* work item is pending execution */
30 : WORK_STRUCT_DELAYED_BIT = 1, /* work item is delayed */
31 : WORK_STRUCT_PWQ_BIT = 2, /* data points to pwq */
32 : WORK_STRUCT_LINKED_BIT = 3, /* next work is linked to this one */
33 : #ifdef CONFIG_DEBUG_OBJECTS_WORK
34 : WORK_STRUCT_STATIC_BIT = 4, /* static initializer (debugobjects) */
35 : WORK_STRUCT_COLOR_SHIFT = 5, /* color for workqueue flushing */
36 : #else
37 : WORK_STRUCT_COLOR_SHIFT = 4, /* color for workqueue flushing */
38 : #endif
39 :
40 : WORK_STRUCT_COLOR_BITS = 4,
41 :
42 : WORK_STRUCT_PENDING = 1 << WORK_STRUCT_PENDING_BIT,
43 : WORK_STRUCT_DELAYED = 1 << WORK_STRUCT_DELAYED_BIT,
44 : WORK_STRUCT_PWQ = 1 << WORK_STRUCT_PWQ_BIT,
45 : WORK_STRUCT_LINKED = 1 << WORK_STRUCT_LINKED_BIT,
46 : #ifdef CONFIG_DEBUG_OBJECTS_WORK
47 : WORK_STRUCT_STATIC = 1 << WORK_STRUCT_STATIC_BIT,
48 : #else
49 : WORK_STRUCT_STATIC = 0,
50 : #endif
51 :
52 : /*
53 : * The last color is no color used for works which don't
54 : * participate in workqueue flushing.
55 : */
56 : WORK_NR_COLORS = (1 << WORK_STRUCT_COLOR_BITS) - 1,
57 : WORK_NO_COLOR = WORK_NR_COLORS,
58 :
59 : /* not bound to any CPU, prefer the local CPU */
60 : WORK_CPU_UNBOUND = NR_CPUS,
61 :
62 : /*
63 : * Reserve 7 bits off of pwq pointer w/ debugobjects turned off.
64 : * This makes pwqs aligned to 256 bytes and allows 15 workqueue
65 : * flush colors.
66 : */
67 : WORK_STRUCT_FLAG_BITS = WORK_STRUCT_COLOR_SHIFT +
68 : WORK_STRUCT_COLOR_BITS,
69 :
70 : /* data contains off-queue information when !WORK_STRUCT_PWQ */
71 : WORK_OFFQ_FLAG_BASE = WORK_STRUCT_COLOR_SHIFT,
72 :
73 : WORK_OFFQ_CANCELING = (1 << WORK_OFFQ_FLAG_BASE),
74 :
75 : /*
76 : * When a work item is off queue, its high bits point to the last
77 : * pool it was on. Cap at 31 bits and use the highest number to
78 : * indicate that no pool is associated.
79 : */
80 : WORK_OFFQ_FLAG_BITS = 1,
81 : WORK_OFFQ_POOL_SHIFT = WORK_OFFQ_FLAG_BASE + WORK_OFFQ_FLAG_BITS,
82 : WORK_OFFQ_LEFT = BITS_PER_LONG - WORK_OFFQ_POOL_SHIFT,
83 : WORK_OFFQ_POOL_BITS = WORK_OFFQ_LEFT <= 31 ? WORK_OFFQ_LEFT : 31,
84 : WORK_OFFQ_POOL_NONE = (1LU << WORK_OFFQ_POOL_BITS) - 1,
85 :
86 : /* convenience constants */
87 : WORK_STRUCT_FLAG_MASK = (1UL << WORK_STRUCT_FLAG_BITS) - 1,
88 : WORK_STRUCT_WQ_DATA_MASK = ~WORK_STRUCT_FLAG_MASK,
89 : WORK_STRUCT_NO_POOL = (unsigned long)WORK_OFFQ_POOL_NONE << WORK_OFFQ_POOL_SHIFT,
90 :
91 : /* bit mask for work_busy() return values */
92 : WORK_BUSY_PENDING = 1 << 0,
93 : WORK_BUSY_RUNNING = 1 << 1,
94 :
95 : /* maximum string length for set_worker_desc() */
96 : WORKER_DESC_LEN = 24,
97 : };
98 :
99 : struct work_struct {
100 : atomic_long_t data;
101 : struct list_head entry;
102 : work_func_t func;
103 : #ifdef CONFIG_LOCKDEP
104 : struct lockdep_map lockdep_map;
105 : #endif
106 : };
107 :
108 : #define WORK_DATA_INIT() ATOMIC_LONG_INIT(WORK_STRUCT_NO_POOL)
109 : #define WORK_DATA_STATIC_INIT() \
110 : ATOMIC_LONG_INIT(WORK_STRUCT_NO_POOL | WORK_STRUCT_STATIC)
111 :
112 : struct delayed_work {
113 : struct work_struct work;
114 : struct timer_list timer;
115 :
116 : /* target workqueue and CPU ->timer uses to queue ->work */
117 : struct workqueue_struct *wq;
118 : int cpu;
119 : };
120 :
121 : /*
122 : * A struct for workqueue attributes. This can be used to change
123 : * attributes of an unbound workqueue.
124 : *
125 : * Unlike other fields, ->no_numa isn't a property of a worker_pool. It
126 : * only modifies how apply_workqueue_attrs() select pools and thus doesn't
127 : * participate in pool hash calculations or equality comparisons.
128 : */
129 : struct workqueue_attrs {
130 : int nice; /* nice level */
131 : cpumask_var_t cpumask; /* allowed CPUs */
132 : bool no_numa; /* disable NUMA affinity */
133 : };
134 :
135 : static inline struct delayed_work *to_delayed_work(struct work_struct *work)
136 : {
137 : return container_of(work, struct delayed_work, work);
138 : }
139 :
140 : struct execute_work {
141 : struct work_struct work;
142 : };
143 :
144 : #ifdef CONFIG_LOCKDEP
145 : /*
146 : * NB: because we have to copy the lockdep_map, setting _key
147 : * here is required, otherwise it could get initialised to the
148 : * copy of the lockdep_map!
149 : */
150 : #define __WORK_INIT_LOCKDEP_MAP(n, k) \
151 : .lockdep_map = STATIC_LOCKDEP_MAP_INIT(n, k),
152 : #else
153 : #define __WORK_INIT_LOCKDEP_MAP(n, k)
154 : #endif
155 :
156 : #define __WORK_INITIALIZER(n, f) { \
157 : .data = WORK_DATA_STATIC_INIT(), \
158 : .entry = { &(n).entry, &(n).entry }, \
159 : .func = (f), \
160 : __WORK_INIT_LOCKDEP_MAP(#n, &(n)) \
161 : }
162 :
163 : #define __DELAYED_WORK_INITIALIZER(n, f, tflags) { \
164 : .work = __WORK_INITIALIZER((n).work, (f)), \
165 : .timer = __TIMER_INITIALIZER(delayed_work_timer_fn, \
166 : 0, (unsigned long)&(n), \
167 : (tflags) | TIMER_IRQSAFE), \
168 : }
169 :
170 : #define DECLARE_WORK(n, f) \
171 : struct work_struct n = __WORK_INITIALIZER(n, f)
172 :
173 : #define DECLARE_DELAYED_WORK(n, f) \
174 : struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f, 0)
175 :
176 : #define DECLARE_DEFERRABLE_WORK(n, f) \
177 : struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f, TIMER_DEFERRABLE)
178 :
179 : #ifdef CONFIG_DEBUG_OBJECTS_WORK
180 : extern void __init_work(struct work_struct *work, int onstack);
181 : extern void destroy_work_on_stack(struct work_struct *work);
182 : extern void destroy_delayed_work_on_stack(struct delayed_work *work);
183 : static inline unsigned int work_static(struct work_struct *work)
184 : {
185 : return *work_data_bits(work) & WORK_STRUCT_STATIC;
186 : }
187 : #else
188 : static inline void __init_work(struct work_struct *work, int onstack) { }
189 : static inline void destroy_work_on_stack(struct work_struct *work) { }
190 : static inline void destroy_delayed_work_on_stack(struct delayed_work *work) { }
191 : static inline unsigned int work_static(struct work_struct *work) { return 0; }
192 : #endif
193 :
194 : /*
195 : * initialize all of a work item in one go
196 : *
197 : * NOTE! No point in using "atomic_long_set()": using a direct
198 : * assignment of the work data initializer allows the compiler
199 : * to generate better code.
200 : */
201 : #ifdef CONFIG_LOCKDEP
202 : #define __INIT_WORK(_work, _func, _onstack) \
203 : do { \
204 : static struct lock_class_key __key; \
205 : \
206 : __init_work((_work), _onstack); \
207 : (_work)->data = (atomic_long_t) WORK_DATA_INIT(); \
208 : lockdep_init_map(&(_work)->lockdep_map, #_work, &__key, 0); \
209 : INIT_LIST_HEAD(&(_work)->entry); \
210 : (_work)->func = (_func); \
211 : } while (0)
212 : #else
213 : #define __INIT_WORK(_work, _func, _onstack) \
214 : do { \
215 : __init_work((_work), _onstack); \
216 : (_work)->data = (atomic_long_t) WORK_DATA_INIT(); \
217 : INIT_LIST_HEAD(&(_work)->entry); \
218 : (_work)->func = (_func); \
219 : } while (0)
220 : #endif
221 :
222 : #define INIT_WORK(_work, _func) \
223 : do { \
224 : __INIT_WORK((_work), (_func), 0); \
225 : } while (0)
226 :
227 : #define INIT_WORK_ONSTACK(_work, _func) \
228 : do { \
229 : __INIT_WORK((_work), (_func), 1); \
230 : } while (0)
231 :
232 : #define __INIT_DELAYED_WORK(_work, _func, _tflags) \
233 : do { \
234 : INIT_WORK(&(_work)->work, (_func)); \
235 : __setup_timer(&(_work)->timer, delayed_work_timer_fn, \
236 : (unsigned long)(_work), \
237 : (_tflags) | TIMER_IRQSAFE); \
238 : } while (0)
239 :
240 : #define __INIT_DELAYED_WORK_ONSTACK(_work, _func, _tflags) \
241 : do { \
242 : INIT_WORK_ONSTACK(&(_work)->work, (_func)); \
243 : __setup_timer_on_stack(&(_work)->timer, \
244 : delayed_work_timer_fn, \
245 : (unsigned long)(_work), \
246 : (_tflags) | TIMER_IRQSAFE); \
247 : } while (0)
248 :
249 : #define INIT_DELAYED_WORK(_work, _func) \
250 : __INIT_DELAYED_WORK(_work, _func, 0)
251 :
252 : #define INIT_DELAYED_WORK_ONSTACK(_work, _func) \
253 : __INIT_DELAYED_WORK_ONSTACK(_work, _func, 0)
254 :
255 : #define INIT_DEFERRABLE_WORK(_work, _func) \
256 : __INIT_DELAYED_WORK(_work, _func, TIMER_DEFERRABLE)
257 :
258 : #define INIT_DEFERRABLE_WORK_ONSTACK(_work, _func) \
259 : __INIT_DELAYED_WORK_ONSTACK(_work, _func, TIMER_DEFERRABLE)
260 :
261 : /**
262 : * work_pending - Find out whether a work item is currently pending
263 : * @work: The work item in question
264 : */
265 : #define work_pending(work) \
266 : test_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))
267 :
268 : /**
269 : * delayed_work_pending - Find out whether a delayable work item is currently
270 : * pending
271 : * @work: The work item in question
272 : */
273 : #define delayed_work_pending(w) \
274 : work_pending(&(w)->work)
275 :
276 : /*
277 : * Workqueue flags and constants. For details, please refer to
278 : * Documentation/workqueue.txt.
279 : */
280 : enum {
281 : WQ_UNBOUND = 1 << 1, /* not bound to any cpu */
282 : WQ_FREEZABLE = 1 << 2, /* freeze during suspend */
283 : WQ_MEM_RECLAIM = 1 << 3, /* may be used for memory reclaim */
284 : WQ_HIGHPRI = 1 << 4, /* high priority */
285 : WQ_CPU_INTENSIVE = 1 << 5, /* cpu intensive workqueue */
286 : WQ_SYSFS = 1 << 6, /* visible in sysfs, see wq_sysfs_register() */
287 :
288 : /*
289 : * Per-cpu workqueues are generally preferred because they tend to
290 : * show better performance thanks to cache locality. Per-cpu
291 : * workqueues exclude the scheduler from choosing the CPU to
292 : * execute the worker threads, which has an unfortunate side effect
293 : * of increasing power consumption.
294 : *
295 : * The scheduler considers a CPU idle if it doesn't have any task
296 : * to execute and tries to keep idle cores idle to conserve power;
297 : * however, for example, a per-cpu work item scheduled from an
298 : * interrupt handler on an idle CPU will force the scheduler to
299 : * excute the work item on that CPU breaking the idleness, which in
300 : * turn may lead to more scheduling choices which are sub-optimal
301 : * in terms of power consumption.
302 : *
303 : * Workqueues marked with WQ_POWER_EFFICIENT are per-cpu by default
304 : * but become unbound if workqueue.power_efficient kernel param is
305 : * specified. Per-cpu workqueues which are identified to
306 : * contribute significantly to power-consumption are identified and
307 : * marked with this flag and enabling the power_efficient mode
308 : * leads to noticeable power saving at the cost of small
309 : * performance disadvantage.
310 : *
311 : * http://thread.gmane.org/gmane.linux.kernel/1480396
312 : */
313 : WQ_POWER_EFFICIENT = 1 << 7,
314 :
315 : __WQ_DRAINING = 1 << 16, /* internal: workqueue is draining */
316 : __WQ_ORDERED = 1 << 17, /* internal: workqueue is ordered */
317 :
318 : WQ_MAX_ACTIVE = 512, /* I like 512, better ideas? */
319 : WQ_MAX_UNBOUND_PER_CPU = 4, /* 4 * #cpus for unbound wq */
320 : WQ_DFL_ACTIVE = WQ_MAX_ACTIVE / 2,
321 : };
322 :
323 : /* unbound wq's aren't per-cpu, scale max_active according to #cpus */
324 : #define WQ_UNBOUND_MAX_ACTIVE \
325 : max_t(int, WQ_MAX_ACTIVE, num_possible_cpus() * WQ_MAX_UNBOUND_PER_CPU)
326 :
327 : /*
328 : * System-wide workqueues which are always present.
329 : *
330 : * system_wq is the one used by schedule[_delayed]_work[_on]().
331 : * Multi-CPU multi-threaded. There are users which expect relatively
332 : * short queue flush time. Don't queue works which can run for too
333 : * long.
334 : *
335 : * system_highpri_wq is similar to system_wq but for work items which
336 : * require WQ_HIGHPRI.
337 : *
338 : * system_long_wq is similar to system_wq but may host long running
339 : * works. Queue flushing might take relatively long.
340 : *
341 : * system_unbound_wq is unbound workqueue. Workers are not bound to
342 : * any specific CPU, not concurrency managed, and all queued works are
343 : * executed immediately as long as max_active limit is not reached and
344 : * resources are available.
345 : *
346 : * system_freezable_wq is equivalent to system_wq except that it's
347 : * freezable.
348 : *
349 : * *_power_efficient_wq are inclined towards saving power and converted
350 : * into WQ_UNBOUND variants if 'wq_power_efficient' is enabled; otherwise,
351 : * they are same as their non-power-efficient counterparts - e.g.
352 : * system_power_efficient_wq is identical to system_wq if
353 : * 'wq_power_efficient' is disabled. See WQ_POWER_EFFICIENT for more info.
354 : */
355 : extern struct workqueue_struct *system_wq;
356 : extern struct workqueue_struct *system_highpri_wq;
357 : extern struct workqueue_struct *system_long_wq;
358 : extern struct workqueue_struct *system_unbound_wq;
359 : extern struct workqueue_struct *system_freezable_wq;
360 : extern struct workqueue_struct *system_power_efficient_wq;
361 : extern struct workqueue_struct *system_freezable_power_efficient_wq;
362 :
363 : extern struct workqueue_struct *
364 : __alloc_workqueue_key(const char *fmt, unsigned int flags, int max_active,
365 : struct lock_class_key *key, const char *lock_name, ...) __printf(1, 6);
366 :
367 : /**
368 : * alloc_workqueue - allocate a workqueue
369 : * @fmt: printf format for the name of the workqueue
370 : * @flags: WQ_* flags
371 : * @max_active: max in-flight work items, 0 for default
372 : * @args: args for @fmt
373 : *
374 : * Allocate a workqueue with the specified parameters. For detailed
375 : * information on WQ_* flags, please refer to Documentation/workqueue.txt.
376 : *
377 : * The __lock_name macro dance is to guarantee that single lock_class_key
378 : * doesn't end up with different namesm, which isn't allowed by lockdep.
379 : *
380 : * RETURNS:
381 : * Pointer to the allocated workqueue on success, %NULL on failure.
382 : */
383 : #ifdef CONFIG_LOCKDEP
384 : #define alloc_workqueue(fmt, flags, max_active, args...) \
385 : ({ \
386 : static struct lock_class_key __key; \
387 : const char *__lock_name; \
388 : \
389 : __lock_name = #fmt#args; \
390 : \
391 : __alloc_workqueue_key((fmt), (flags), (max_active), \
392 : &__key, __lock_name, ##args); \
393 : })
394 : #else
395 : #define alloc_workqueue(fmt, flags, max_active, args...) \
396 : __alloc_workqueue_key((fmt), (flags), (max_active), \
397 : NULL, NULL, ##args)
398 : #endif
399 :
400 : /**
401 : * alloc_ordered_workqueue - allocate an ordered workqueue
402 : * @fmt: printf format for the name of the workqueue
403 : * @flags: WQ_* flags (only WQ_FREEZABLE and WQ_MEM_RECLAIM are meaningful)
404 : * @args: args for @fmt
405 : *
406 : * Allocate an ordered workqueue. An ordered workqueue executes at
407 : * most one work item at any given time in the queued order. They are
408 : * implemented as unbound workqueues with @max_active of one.
409 : *
410 : * RETURNS:
411 : * Pointer to the allocated workqueue on success, %NULL on failure.
412 : */
413 : #define alloc_ordered_workqueue(fmt, flags, args...) \
414 : alloc_workqueue(fmt, WQ_UNBOUND | __WQ_ORDERED | (flags), 1, ##args)
415 :
416 : #define create_workqueue(name) \
417 : alloc_workqueue("%s", WQ_MEM_RECLAIM, 1, (name))
418 : #define create_freezable_workqueue(name) \
419 : alloc_workqueue("%s", WQ_FREEZABLE | WQ_UNBOUND | WQ_MEM_RECLAIM, \
420 : 1, (name))
421 : #define create_singlethread_workqueue(name) \
422 : alloc_ordered_workqueue("%s", WQ_MEM_RECLAIM, name)
423 :
424 : extern void destroy_workqueue(struct workqueue_struct *wq);
425 :
426 : struct workqueue_attrs *alloc_workqueue_attrs(gfp_t gfp_mask);
427 : void free_workqueue_attrs(struct workqueue_attrs *attrs);
428 : int apply_workqueue_attrs(struct workqueue_struct *wq,
429 : const struct workqueue_attrs *attrs);
430 :
431 : extern bool queue_work_on(int cpu, struct workqueue_struct *wq,
432 : struct work_struct *work);
433 : extern bool queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
434 : struct delayed_work *work, unsigned long delay);
435 : extern bool mod_delayed_work_on(int cpu, struct workqueue_struct *wq,
436 : struct delayed_work *dwork, unsigned long delay);
437 :
438 : extern void flush_workqueue(struct workqueue_struct *wq);
439 : extern void drain_workqueue(struct workqueue_struct *wq);
440 : extern void flush_scheduled_work(void);
441 :
442 : extern int schedule_on_each_cpu(work_func_t func);
443 :
444 : int execute_in_process_context(work_func_t fn, struct execute_work *);
445 :
446 : extern bool flush_work(struct work_struct *work);
447 : extern bool cancel_work_sync(struct work_struct *work);
448 :
449 : extern bool flush_delayed_work(struct delayed_work *dwork);
450 : extern bool cancel_delayed_work(struct delayed_work *dwork);
451 : extern bool cancel_delayed_work_sync(struct delayed_work *dwork);
452 :
453 : extern void workqueue_set_max_active(struct workqueue_struct *wq,
454 : int max_active);
455 : extern bool current_is_workqueue_rescuer(void);
456 : extern bool workqueue_congested(int cpu, struct workqueue_struct *wq);
457 : extern unsigned int work_busy(struct work_struct *work);
458 : extern __printf(1, 2) void set_worker_desc(const char *fmt, ...);
459 : extern void print_worker_info(const char *log_lvl, struct task_struct *task);
460 :
461 : /**
462 : * queue_work - queue work on a workqueue
463 : * @wq: workqueue to use
464 : * @work: work to queue
465 : *
466 : * Returns %false if @work was already on a queue, %true otherwise.
467 : *
468 : * We queue the work to the CPU on which it was submitted, but if the CPU dies
469 : * it can be processed by another CPU.
470 : */
471 : static inline bool queue_work(struct workqueue_struct *wq,
472 : struct work_struct *work)
473 : {
474 364945 : return queue_work_on(WORK_CPU_UNBOUND, wq, work);
475 : }
476 :
477 : /**
478 : * queue_delayed_work - queue work on a workqueue after delay
479 : * @wq: workqueue to use
480 : * @dwork: delayable work to queue
481 : * @delay: number of jiffies to wait before queueing
482 : *
483 : * Equivalent to queue_delayed_work_on() but tries to use the local CPU.
484 : */
485 : static inline bool queue_delayed_work(struct workqueue_struct *wq,
486 : struct delayed_work *dwork,
487 : unsigned long delay)
488 : {
489 : return queue_delayed_work_on(WORK_CPU_UNBOUND, wq, dwork, delay);
490 : }
491 :
492 : /**
493 : * mod_delayed_work - modify delay of or queue a delayed work
494 : * @wq: workqueue to use
495 : * @dwork: work to queue
496 : * @delay: number of jiffies to wait before queueing
497 : *
498 : * mod_delayed_work_on() on local CPU.
499 : */
500 : static inline bool mod_delayed_work(struct workqueue_struct *wq,
501 : struct delayed_work *dwork,
502 : unsigned long delay)
503 : {
504 : return mod_delayed_work_on(WORK_CPU_UNBOUND, wq, dwork, delay);
505 : }
506 :
507 : /**
508 : * schedule_work_on - put work task on a specific cpu
509 : * @cpu: cpu to put the work task on
510 : * @work: job to be done
511 : *
512 : * This puts a job on a specific cpu
513 : */
514 : static inline bool schedule_work_on(int cpu, struct work_struct *work)
515 : {
516 : return queue_work_on(cpu, system_wq, work);
517 : }
518 :
519 : /**
520 : * schedule_work - put work task in global workqueue
521 : * @work: job to be done
522 : *
523 : * Returns %false if @work was already on the kernel-global workqueue and
524 : * %true otherwise.
525 : *
526 : * This puts a job in the kernel-global workqueue if it was not already
527 : * queued and leaves it in the same position on the kernel-global
528 : * workqueue otherwise.
529 : */
530 : static inline bool schedule_work(struct work_struct *work)
531 : {
532 256 : return queue_work(system_wq, work);
533 : }
534 :
535 : /**
536 : * schedule_delayed_work_on - queue work in global workqueue on CPU after delay
537 : * @cpu: cpu to use
538 : * @dwork: job to be done
539 : * @delay: number of jiffies to wait
540 : *
541 : * After waiting for a given time this puts a job in the kernel-global
542 : * workqueue on the specified CPU.
543 : */
544 : static inline bool schedule_delayed_work_on(int cpu, struct delayed_work *dwork,
545 : unsigned long delay)
546 : {
547 : return queue_delayed_work_on(cpu, system_wq, dwork, delay);
548 : }
549 :
550 : /**
551 : * schedule_delayed_work - put work task in global workqueue after delay
552 : * @dwork: job to be done
553 : * @delay: number of jiffies to wait or 0 for immediate execution
554 : *
555 : * After waiting for a given time this puts a job in the kernel-global
556 : * workqueue.
557 : */
558 : static inline bool schedule_delayed_work(struct delayed_work *dwork,
559 : unsigned long delay)
560 : {
561 : return queue_delayed_work(system_wq, dwork, delay);
562 : }
563 :
564 : /**
565 : * keventd_up - is workqueue initialized yet?
566 : */
567 : static inline bool keventd_up(void)
568 : {
569 : return system_wq != NULL;
570 : }
571 :
572 : #ifndef CONFIG_SMP
573 : static inline long work_on_cpu(int cpu, long (*fn)(void *), void *arg)
574 : {
575 : return fn(arg);
576 : }
577 : #else
578 : long work_on_cpu(int cpu, long (*fn)(void *), void *arg);
579 : #endif /* CONFIG_SMP */
580 :
581 : #ifdef CONFIG_FREEZER
582 : extern void freeze_workqueues_begin(void);
583 : extern bool freeze_workqueues_busy(void);
584 : extern void thaw_workqueues(void);
585 : #endif /* CONFIG_FREEZER */
586 :
587 : #ifdef CONFIG_SYSFS
588 : int workqueue_sysfs_register(struct workqueue_struct *wq);
589 : #else /* CONFIG_SYSFS */
590 : static inline int workqueue_sysfs_register(struct workqueue_struct *wq)
591 : { return 0; }
592 : #endif /* CONFIG_SYSFS */
593 :
594 : #endif
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