slub: use sysfs'es release mechanism for kmem_cache
[deliverable/linux.git] / include / linux / workqueue.h
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 /* special cpu IDs */
60 WORK_CPU_UNBOUND = NR_CPUS,
61 WORK_CPU_END = NR_CPUS + 1,
62
63 /*
64 * Reserve 7 bits off of pwq pointer w/ debugobjects turned off.
65 * This makes pwqs aligned to 256 bytes and allows 15 workqueue
66 * flush colors.
67 */
68 WORK_STRUCT_FLAG_BITS = WORK_STRUCT_COLOR_SHIFT +
69 WORK_STRUCT_COLOR_BITS,
70
71 /* data contains off-queue information when !WORK_STRUCT_PWQ */
72 WORK_OFFQ_FLAG_BASE = WORK_STRUCT_COLOR_SHIFT,
73
74 WORK_OFFQ_CANCELING = (1 << WORK_OFFQ_FLAG_BASE),
75
76 /*
77 * When a work item is off queue, its high bits point to the last
78 * pool it was on. Cap at 31 bits and use the highest number to
79 * indicate that no pool is associated.
80 */
81 WORK_OFFQ_FLAG_BITS = 1,
82 WORK_OFFQ_POOL_SHIFT = WORK_OFFQ_FLAG_BASE + WORK_OFFQ_FLAG_BITS,
83 WORK_OFFQ_LEFT = BITS_PER_LONG - WORK_OFFQ_POOL_SHIFT,
84 WORK_OFFQ_POOL_BITS = WORK_OFFQ_LEFT <= 31 ? WORK_OFFQ_LEFT : 31,
85 WORK_OFFQ_POOL_NONE = (1LU << WORK_OFFQ_POOL_BITS) - 1,
86
87 /* convenience constants */
88 WORK_STRUCT_FLAG_MASK = (1UL << WORK_STRUCT_FLAG_BITS) - 1,
89 WORK_STRUCT_WQ_DATA_MASK = ~WORK_STRUCT_FLAG_MASK,
90 WORK_STRUCT_NO_POOL = (unsigned long)WORK_OFFQ_POOL_NONE << WORK_OFFQ_POOL_SHIFT,
91
92 /* bit mask for work_busy() return values */
93 WORK_BUSY_PENDING = 1 << 0,
94 WORK_BUSY_RUNNING = 1 << 1,
95
96 /* maximum string length for set_worker_desc() */
97 WORKER_DESC_LEN = 24,
98 };
99
100 struct work_struct {
101 atomic_long_t data;
102 struct list_head entry;
103 work_func_t func;
104 #ifdef CONFIG_LOCKDEP
105 struct lockdep_map lockdep_map;
106 #endif
107 };
108
109 #define WORK_DATA_INIT() ATOMIC_LONG_INIT(WORK_STRUCT_NO_POOL)
110 #define WORK_DATA_STATIC_INIT() \
111 ATOMIC_LONG_INIT(WORK_STRUCT_NO_POOL | WORK_STRUCT_STATIC)
112
113 struct delayed_work {
114 struct work_struct work;
115 struct timer_list timer;
116
117 /* target workqueue and CPU ->timer uses to queue ->work */
118 struct workqueue_struct *wq;
119 int cpu;
120 };
121
122 /*
123 * A struct for workqueue attributes. This can be used to change
124 * attributes of an unbound workqueue.
125 *
126 * Unlike other fields, ->no_numa isn't a property of a worker_pool. It
127 * only modifies how apply_workqueue_attrs() select pools and thus doesn't
128 * participate in pool hash calculations or equality comparisons.
129 */
130 struct workqueue_attrs {
131 int nice; /* nice level */
132 cpumask_var_t cpumask; /* allowed CPUs */
133 bool no_numa; /* disable NUMA affinity */
134 };
135
136 static inline struct delayed_work *to_delayed_work(struct work_struct *work)
137 {
138 return container_of(work, struct delayed_work, work);
139 }
140
141 struct execute_work {
142 struct work_struct work;
143 };
144
145 #ifdef CONFIG_LOCKDEP
146 /*
147 * NB: because we have to copy the lockdep_map, setting _key
148 * here is required, otherwise it could get initialised to the
149 * copy of the lockdep_map!
150 */
151 #define __WORK_INIT_LOCKDEP_MAP(n, k) \
152 .lockdep_map = STATIC_LOCKDEP_MAP_INIT(n, k),
153 #else
154 #define __WORK_INIT_LOCKDEP_MAP(n, k)
155 #endif
156
157 #define __WORK_INITIALIZER(n, f) { \
158 .data = WORK_DATA_STATIC_INIT(), \
159 .entry = { &(n).entry, &(n).entry }, \
160 .func = (f), \
161 __WORK_INIT_LOCKDEP_MAP(#n, &(n)) \
162 }
163
164 #define __DELAYED_WORK_INITIALIZER(n, f, tflags) { \
165 .work = __WORK_INITIALIZER((n).work, (f)), \
166 .timer = __TIMER_INITIALIZER(delayed_work_timer_fn, \
167 0, (unsigned long)&(n), \
168 (tflags) | TIMER_IRQSAFE), \
169 }
170
171 #define DECLARE_WORK(n, f) \
172 struct work_struct n = __WORK_INITIALIZER(n, f)
173
174 #define DECLARE_DELAYED_WORK(n, f) \
175 struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f, 0)
176
177 #define DECLARE_DEFERRABLE_WORK(n, f) \
178 struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f, TIMER_DEFERRABLE)
179
180 #ifdef CONFIG_DEBUG_OBJECTS_WORK
181 extern void __init_work(struct work_struct *work, int onstack);
182 extern void destroy_work_on_stack(struct work_struct *work);
183 extern void destroy_delayed_work_on_stack(struct delayed_work *work);
184 static inline unsigned int work_static(struct work_struct *work)
185 {
186 return *work_data_bits(work) & WORK_STRUCT_STATIC;
187 }
188 #else
189 static inline void __init_work(struct work_struct *work, int onstack) { }
190 static inline void destroy_work_on_stack(struct work_struct *work) { }
191 static inline void destroy_delayed_work_on_stack(struct delayed_work *work) { }
192 static inline unsigned int work_static(struct work_struct *work) { return 0; }
193 #endif
194
195 /*
196 * initialize all of a work item in one go
197 *
198 * NOTE! No point in using "atomic_long_set()": using a direct
199 * assignment of the work data initializer allows the compiler
200 * to generate better code.
201 */
202 #ifdef CONFIG_LOCKDEP
203 #define __INIT_WORK(_work, _func, _onstack) \
204 do { \
205 static struct lock_class_key __key; \
206 \
207 __init_work((_work), _onstack); \
208 (_work)->data = (atomic_long_t) WORK_DATA_INIT(); \
209 lockdep_init_map(&(_work)->lockdep_map, #_work, &__key, 0); \
210 INIT_LIST_HEAD(&(_work)->entry); \
211 (_work)->func = (_func); \
212 } while (0)
213 #else
214 #define __INIT_WORK(_work, _func, _onstack) \
215 do { \
216 __init_work((_work), _onstack); \
217 (_work)->data = (atomic_long_t) WORK_DATA_INIT(); \
218 INIT_LIST_HEAD(&(_work)->entry); \
219 (_work)->func = (_func); \
220 } while (0)
221 #endif
222
223 #define INIT_WORK(_work, _func) \
224 do { \
225 __INIT_WORK((_work), (_func), 0); \
226 } while (0)
227
228 #define INIT_WORK_ONSTACK(_work, _func) \
229 do { \
230 __INIT_WORK((_work), (_func), 1); \
231 } while (0)
232
233 #define __INIT_DELAYED_WORK(_work, _func, _tflags) \
234 do { \
235 INIT_WORK(&(_work)->work, (_func)); \
236 __setup_timer(&(_work)->timer, delayed_work_timer_fn, \
237 (unsigned long)(_work), \
238 (_tflags) | TIMER_IRQSAFE); \
239 } while (0)
240
241 #define __INIT_DELAYED_WORK_ONSTACK(_work, _func, _tflags) \
242 do { \
243 INIT_WORK_ONSTACK(&(_work)->work, (_func)); \
244 __setup_timer_on_stack(&(_work)->timer, \
245 delayed_work_timer_fn, \
246 (unsigned long)(_work), \
247 (_tflags) | TIMER_IRQSAFE); \
248 } while (0)
249
250 #define INIT_DELAYED_WORK(_work, _func) \
251 __INIT_DELAYED_WORK(_work, _func, 0)
252
253 #define INIT_DELAYED_WORK_ONSTACK(_work, _func) \
254 __INIT_DELAYED_WORK_ONSTACK(_work, _func, 0)
255
256 #define INIT_DEFERRABLE_WORK(_work, _func) \
257 __INIT_DELAYED_WORK(_work, _func, TIMER_DEFERRABLE)
258
259 #define INIT_DEFERRABLE_WORK_ONSTACK(_work, _func) \
260 __INIT_DELAYED_WORK_ONSTACK(_work, _func, TIMER_DEFERRABLE)
261
262 /**
263 * work_pending - Find out whether a work item is currently pending
264 * @work: The work item in question
265 */
266 #define work_pending(work) \
267 test_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))
268
269 /**
270 * delayed_work_pending - Find out whether a delayable work item is currently
271 * pending
272 * @work: The work item in question
273 */
274 #define delayed_work_pending(w) \
275 work_pending(&(w)->work)
276
277 /**
278 * work_clear_pending - for internal use only, mark a work item as not pending
279 * @work: The work item in question
280 */
281 #define work_clear_pending(work) \
282 clear_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))
283
284 /*
285 * Workqueue flags and constants. For details, please refer to
286 * Documentation/workqueue.txt.
287 */
288 enum {
289 WQ_UNBOUND = 1 << 1, /* not bound to any cpu */
290 WQ_FREEZABLE = 1 << 2, /* freeze during suspend */
291 WQ_MEM_RECLAIM = 1 << 3, /* may be used for memory reclaim */
292 WQ_HIGHPRI = 1 << 4, /* high priority */
293 WQ_CPU_INTENSIVE = 1 << 5, /* cpu intensive workqueue */
294 WQ_SYSFS = 1 << 6, /* visible in sysfs, see wq_sysfs_register() */
295
296 /*
297 * Per-cpu workqueues are generally preferred because they tend to
298 * show better performance thanks to cache locality. Per-cpu
299 * workqueues exclude the scheduler from choosing the CPU to
300 * execute the worker threads, which has an unfortunate side effect
301 * of increasing power consumption.
302 *
303 * The scheduler considers a CPU idle if it doesn't have any task
304 * to execute and tries to keep idle cores idle to conserve power;
305 * however, for example, a per-cpu work item scheduled from an
306 * interrupt handler on an idle CPU will force the scheduler to
307 * excute the work item on that CPU breaking the idleness, which in
308 * turn may lead to more scheduling choices which are sub-optimal
309 * in terms of power consumption.
310 *
311 * Workqueues marked with WQ_POWER_EFFICIENT are per-cpu by default
312 * but become unbound if workqueue.power_efficient kernel param is
313 * specified. Per-cpu workqueues which are identified to
314 * contribute significantly to power-consumption are identified and
315 * marked with this flag and enabling the power_efficient mode
316 * leads to noticeable power saving at the cost of small
317 * performance disadvantage.
318 *
319 * http://thread.gmane.org/gmane.linux.kernel/1480396
320 */
321 WQ_POWER_EFFICIENT = 1 << 7,
322
323 __WQ_DRAINING = 1 << 16, /* internal: workqueue is draining */
324 __WQ_ORDERED = 1 << 17, /* internal: workqueue is ordered */
325
326 WQ_MAX_ACTIVE = 512, /* I like 512, better ideas? */
327 WQ_MAX_UNBOUND_PER_CPU = 4, /* 4 * #cpus for unbound wq */
328 WQ_DFL_ACTIVE = WQ_MAX_ACTIVE / 2,
329 };
330
331 /* unbound wq's aren't per-cpu, scale max_active according to #cpus */
332 #define WQ_UNBOUND_MAX_ACTIVE \
333 max_t(int, WQ_MAX_ACTIVE, num_possible_cpus() * WQ_MAX_UNBOUND_PER_CPU)
334
335 /*
336 * System-wide workqueues which are always present.
337 *
338 * system_wq is the one used by schedule[_delayed]_work[_on]().
339 * Multi-CPU multi-threaded. There are users which expect relatively
340 * short queue flush time. Don't queue works which can run for too
341 * long.
342 *
343 * system_long_wq is similar to system_wq but may host long running
344 * works. Queue flushing might take relatively long.
345 *
346 * system_unbound_wq is unbound workqueue. Workers are not bound to
347 * any specific CPU, not concurrency managed, and all queued works are
348 * executed immediately as long as max_active limit is not reached and
349 * resources are available.
350 *
351 * system_freezable_wq is equivalent to system_wq except that it's
352 * freezable.
353 *
354 * *_power_efficient_wq are inclined towards saving power and converted
355 * into WQ_UNBOUND variants if 'wq_power_efficient' is enabled; otherwise,
356 * they are same as their non-power-efficient counterparts - e.g.
357 * system_power_efficient_wq is identical to system_wq if
358 * 'wq_power_efficient' is disabled. See WQ_POWER_EFFICIENT for more info.
359 */
360 extern struct workqueue_struct *system_wq;
361 extern struct workqueue_struct *system_long_wq;
362 extern struct workqueue_struct *system_unbound_wq;
363 extern struct workqueue_struct *system_freezable_wq;
364 extern struct workqueue_struct *system_power_efficient_wq;
365 extern struct workqueue_struct *system_freezable_power_efficient_wq;
366
367 static inline struct workqueue_struct * __deprecated __system_nrt_wq(void)
368 {
369 return system_wq;
370 }
371
372 static inline struct workqueue_struct * __deprecated __system_nrt_freezable_wq(void)
373 {
374 return system_freezable_wq;
375 }
376
377 /* equivlalent to system_wq and system_freezable_wq, deprecated */
378 #define system_nrt_wq __system_nrt_wq()
379 #define system_nrt_freezable_wq __system_nrt_freezable_wq()
380
381 extern struct workqueue_struct *
382 __alloc_workqueue_key(const char *fmt, unsigned int flags, int max_active,
383 struct lock_class_key *key, const char *lock_name, ...) __printf(1, 6);
384
385 /**
386 * alloc_workqueue - allocate a workqueue
387 * @fmt: printf format for the name of the workqueue
388 * @flags: WQ_* flags
389 * @max_active: max in-flight work items, 0 for default
390 * @args: args for @fmt
391 *
392 * Allocate a workqueue with the specified parameters. For detailed
393 * information on WQ_* flags, please refer to Documentation/workqueue.txt.
394 *
395 * The __lock_name macro dance is to guarantee that single lock_class_key
396 * doesn't end up with different namesm, which isn't allowed by lockdep.
397 *
398 * RETURNS:
399 * Pointer to the allocated workqueue on success, %NULL on failure.
400 */
401 #ifdef CONFIG_LOCKDEP
402 #define alloc_workqueue(fmt, flags, max_active, args...) \
403 ({ \
404 static struct lock_class_key __key; \
405 const char *__lock_name; \
406 \
407 __lock_name = #fmt#args; \
408 \
409 __alloc_workqueue_key((fmt), (flags), (max_active), \
410 &__key, __lock_name, ##args); \
411 })
412 #else
413 #define alloc_workqueue(fmt, flags, max_active, args...) \
414 __alloc_workqueue_key((fmt), (flags), (max_active), \
415 NULL, NULL, ##args)
416 #endif
417
418 /**
419 * alloc_ordered_workqueue - allocate an ordered workqueue
420 * @fmt: printf format for the name of the workqueue
421 * @flags: WQ_* flags (only WQ_FREEZABLE and WQ_MEM_RECLAIM are meaningful)
422 * @args: args for @fmt
423 *
424 * Allocate an ordered workqueue. An ordered workqueue executes at
425 * most one work item at any given time in the queued order. They are
426 * implemented as unbound workqueues with @max_active of one.
427 *
428 * RETURNS:
429 * Pointer to the allocated workqueue on success, %NULL on failure.
430 */
431 #define alloc_ordered_workqueue(fmt, flags, args...) \
432 alloc_workqueue(fmt, WQ_UNBOUND | __WQ_ORDERED | (flags), 1, ##args)
433
434 #define create_workqueue(name) \
435 alloc_workqueue("%s", WQ_MEM_RECLAIM, 1, (name))
436 #define create_freezable_workqueue(name) \
437 alloc_workqueue("%s", WQ_FREEZABLE | WQ_UNBOUND | WQ_MEM_RECLAIM, \
438 1, (name))
439 #define create_singlethread_workqueue(name) \
440 alloc_workqueue("%s", WQ_UNBOUND | WQ_MEM_RECLAIM, 1, (name))
441
442 extern void destroy_workqueue(struct workqueue_struct *wq);
443
444 struct workqueue_attrs *alloc_workqueue_attrs(gfp_t gfp_mask);
445 void free_workqueue_attrs(struct workqueue_attrs *attrs);
446 int apply_workqueue_attrs(struct workqueue_struct *wq,
447 const struct workqueue_attrs *attrs);
448
449 extern bool queue_work_on(int cpu, struct workqueue_struct *wq,
450 struct work_struct *work);
451 extern bool queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
452 struct delayed_work *work, unsigned long delay);
453 extern bool mod_delayed_work_on(int cpu, struct workqueue_struct *wq,
454 struct delayed_work *dwork, unsigned long delay);
455
456 extern void flush_workqueue(struct workqueue_struct *wq);
457 extern void drain_workqueue(struct workqueue_struct *wq);
458 extern void flush_scheduled_work(void);
459
460 extern int schedule_on_each_cpu(work_func_t func);
461
462 int execute_in_process_context(work_func_t fn, struct execute_work *);
463
464 extern bool flush_work(struct work_struct *work);
465 extern bool cancel_work_sync(struct work_struct *work);
466
467 extern bool flush_delayed_work(struct delayed_work *dwork);
468 extern bool cancel_delayed_work(struct delayed_work *dwork);
469 extern bool cancel_delayed_work_sync(struct delayed_work *dwork);
470
471 extern void workqueue_set_max_active(struct workqueue_struct *wq,
472 int max_active);
473 extern bool current_is_workqueue_rescuer(void);
474 extern bool workqueue_congested(int cpu, struct workqueue_struct *wq);
475 extern unsigned int work_busy(struct work_struct *work);
476 extern __printf(1, 2) void set_worker_desc(const char *fmt, ...);
477 extern void print_worker_info(const char *log_lvl, struct task_struct *task);
478
479 /**
480 * queue_work - queue work on a workqueue
481 * @wq: workqueue to use
482 * @work: work to queue
483 *
484 * Returns %false if @work was already on a queue, %true otherwise.
485 *
486 * We queue the work to the CPU on which it was submitted, but if the CPU dies
487 * it can be processed by another CPU.
488 */
489 static inline bool queue_work(struct workqueue_struct *wq,
490 struct work_struct *work)
491 {
492 return queue_work_on(WORK_CPU_UNBOUND, wq, work);
493 }
494
495 /**
496 * queue_delayed_work - queue work on a workqueue after delay
497 * @wq: workqueue to use
498 * @dwork: delayable work to queue
499 * @delay: number of jiffies to wait before queueing
500 *
501 * Equivalent to queue_delayed_work_on() but tries to use the local CPU.
502 */
503 static inline bool queue_delayed_work(struct workqueue_struct *wq,
504 struct delayed_work *dwork,
505 unsigned long delay)
506 {
507 return queue_delayed_work_on(WORK_CPU_UNBOUND, wq, dwork, delay);
508 }
509
510 /**
511 * mod_delayed_work - modify delay of or queue a delayed work
512 * @wq: workqueue to use
513 * @dwork: work to queue
514 * @delay: number of jiffies to wait before queueing
515 *
516 * mod_delayed_work_on() on local CPU.
517 */
518 static inline bool mod_delayed_work(struct workqueue_struct *wq,
519 struct delayed_work *dwork,
520 unsigned long delay)
521 {
522 return mod_delayed_work_on(WORK_CPU_UNBOUND, wq, dwork, delay);
523 }
524
525 /**
526 * schedule_work_on - put work task on a specific cpu
527 * @cpu: cpu to put the work task on
528 * @work: job to be done
529 *
530 * This puts a job on a specific cpu
531 */
532 static inline bool schedule_work_on(int cpu, struct work_struct *work)
533 {
534 return queue_work_on(cpu, system_wq, work);
535 }
536
537 /**
538 * schedule_work - put work task in global workqueue
539 * @work: job to be done
540 *
541 * Returns %false if @work was already on the kernel-global workqueue and
542 * %true otherwise.
543 *
544 * This puts a job in the kernel-global workqueue if it was not already
545 * queued and leaves it in the same position on the kernel-global
546 * workqueue otherwise.
547 */
548 static inline bool schedule_work(struct work_struct *work)
549 {
550 return queue_work(system_wq, work);
551 }
552
553 /**
554 * schedule_delayed_work_on - queue work in global workqueue on CPU after delay
555 * @cpu: cpu to use
556 * @dwork: job to be done
557 * @delay: number of jiffies to wait
558 *
559 * After waiting for a given time this puts a job in the kernel-global
560 * workqueue on the specified CPU.
561 */
562 static inline bool schedule_delayed_work_on(int cpu, struct delayed_work *dwork,
563 unsigned long delay)
564 {
565 return queue_delayed_work_on(cpu, system_wq, dwork, delay);
566 }
567
568 /**
569 * schedule_delayed_work - put work task in global workqueue after delay
570 * @dwork: job to be done
571 * @delay: number of jiffies to wait or 0 for immediate execution
572 *
573 * After waiting for a given time this puts a job in the kernel-global
574 * workqueue.
575 */
576 static inline bool schedule_delayed_work(struct delayed_work *dwork,
577 unsigned long delay)
578 {
579 return queue_delayed_work(system_wq, dwork, delay);
580 }
581
582 /**
583 * keventd_up - is workqueue initialized yet?
584 */
585 static inline bool keventd_up(void)
586 {
587 return system_wq != NULL;
588 }
589
590 /* used to be different but now identical to flush_work(), deprecated */
591 static inline bool __deprecated flush_work_sync(struct work_struct *work)
592 {
593 return flush_work(work);
594 }
595
596 /* used to be different but now identical to flush_delayed_work(), deprecated */
597 static inline bool __deprecated flush_delayed_work_sync(struct delayed_work *dwork)
598 {
599 return flush_delayed_work(dwork);
600 }
601
602 #ifndef CONFIG_SMP
603 static inline long work_on_cpu(int cpu, long (*fn)(void *), void *arg)
604 {
605 return fn(arg);
606 }
607 #else
608 long work_on_cpu(int cpu, long (*fn)(void *), void *arg);
609 #endif /* CONFIG_SMP */
610
611 #ifdef CONFIG_FREEZER
612 extern void freeze_workqueues_begin(void);
613 extern bool freeze_workqueues_busy(void);
614 extern void thaw_workqueues(void);
615 #endif /* CONFIG_FREEZER */
616
617 #ifdef CONFIG_SYSFS
618 int workqueue_sysfs_register(struct workqueue_struct *wq);
619 #else /* CONFIG_SYSFS */
620 static inline int workqueue_sysfs_register(struct workqueue_struct *wq)
621 { return 0; }
622 #endif /* CONFIG_SYSFS */
623
624 #endif
This page took 0.060671 seconds and 5 git commands to generate.