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TOMOYO Linux Cross Reference
Linux/include/linux/workqueue.h

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  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   = WORK_OFFQ_FLAG_BASE,
 74         WORK_OFFQ_CANCELING     = (1 << __WORK_OFFQ_CANCELING),
 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         __INIT_WORK((_work), (_func), 0)
225 
226 #define INIT_WORK_ONSTACK(_work, _func)                                 \
227         __INIT_WORK((_work), (_func), 1)
228 
229 #define __INIT_DELAYED_WORK(_work, _func, _tflags)                      \
230         do {                                                            \
231                 INIT_WORK(&(_work)->work, (_func));                     \
232                 __setup_timer(&(_work)->timer, delayed_work_timer_fn,   \
233                               (unsigned long)(_work),                   \
234                               (_tflags) | TIMER_IRQSAFE);               \
235         } while (0)
236 
237 #define __INIT_DELAYED_WORK_ONSTACK(_work, _func, _tflags)              \
238         do {                                                            \
239                 INIT_WORK_ONSTACK(&(_work)->work, (_func));             \
240                 __setup_timer_on_stack(&(_work)->timer,                 \
241                                        delayed_work_timer_fn,           \
242                                        (unsigned long)(_work),          \
243                                        (_tflags) | TIMER_IRQSAFE);      \
244         } while (0)
245 
246 #define INIT_DELAYED_WORK(_work, _func)                                 \
247         __INIT_DELAYED_WORK(_work, _func, 0)
248 
249 #define INIT_DELAYED_WORK_ONSTACK(_work, _func)                         \
250         __INIT_DELAYED_WORK_ONSTACK(_work, _func, 0)
251 
252 #define INIT_DEFERRABLE_WORK(_work, _func)                              \
253         __INIT_DELAYED_WORK(_work, _func, TIMER_DEFERRABLE)
254 
255 #define INIT_DEFERRABLE_WORK_ONSTACK(_work, _func)                      \
256         __INIT_DELAYED_WORK_ONSTACK(_work, _func, TIMER_DEFERRABLE)
257 
258 /**
259  * work_pending - Find out whether a work item is currently pending
260  * @work: The work item in question
261  */
262 #define work_pending(work) \
263         test_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))
264 
265 /**
266  * delayed_work_pending - Find out whether a delayable work item is currently
267  * pending
268  * @work: The work item in question
269  */
270 #define delayed_work_pending(w) \
271         work_pending(&(w)->work)
272 
273 /*
274  * Workqueue flags and constants.  For details, please refer to
275  * Documentation/workqueue.txt.
276  */
277 enum {
278         WQ_UNBOUND              = 1 << 1, /* not bound to any cpu */
279         WQ_FREEZABLE            = 1 << 2, /* freeze during suspend */
280         WQ_MEM_RECLAIM          = 1 << 3, /* may be used for memory reclaim */
281         WQ_HIGHPRI              = 1 << 4, /* high priority */
282         WQ_CPU_INTENSIVE        = 1 << 5, /* cpu intensive workqueue */
283         WQ_SYSFS                = 1 << 6, /* visible in sysfs, see wq_sysfs_register() */
284 
285         /*
286          * Per-cpu workqueues are generally preferred because they tend to
287          * show better performance thanks to cache locality.  Per-cpu
288          * workqueues exclude the scheduler from choosing the CPU to
289          * execute the worker threads, which has an unfortunate side effect
290          * of increasing power consumption.
291          *
292          * The scheduler considers a CPU idle if it doesn't have any task
293          * to execute and tries to keep idle cores idle to conserve power;
294          * however, for example, a per-cpu work item scheduled from an
295          * interrupt handler on an idle CPU will force the scheduler to
296          * excute the work item on that CPU breaking the idleness, which in
297          * turn may lead to more scheduling choices which are sub-optimal
298          * in terms of power consumption.
299          *
300          * Workqueues marked with WQ_POWER_EFFICIENT are per-cpu by default
301          * but become unbound if workqueue.power_efficient kernel param is
302          * specified.  Per-cpu workqueues which are identified to
303          * contribute significantly to power-consumption are identified and
304          * marked with this flag and enabling the power_efficient mode
305          * leads to noticeable power saving at the cost of small
306          * performance disadvantage.
307          *
308          * http://thread.gmane.org/gmane.linux.kernel/1480396
309          */
310         WQ_POWER_EFFICIENT      = 1 << 7,
311 
312         __WQ_DRAINING           = 1 << 16, /* internal: workqueue is draining */
313         __WQ_ORDERED            = 1 << 17, /* internal: workqueue is ordered */
314 
315         WQ_MAX_ACTIVE           = 512,    /* I like 512, better ideas? */
316         WQ_MAX_UNBOUND_PER_CPU  = 4,      /* 4 * #cpus for unbound wq */
317         WQ_DFL_ACTIVE           = WQ_MAX_ACTIVE / 2,
318 };
319 
320 /* unbound wq's aren't per-cpu, scale max_active according to #cpus */
321 #define WQ_UNBOUND_MAX_ACTIVE   \
322         max_t(int, WQ_MAX_ACTIVE, num_possible_cpus() * WQ_MAX_UNBOUND_PER_CPU)
323 
324 /*
325  * System-wide workqueues which are always present.
326  *
327  * system_wq is the one used by schedule[_delayed]_work[_on]().
328  * Multi-CPU multi-threaded.  There are users which expect relatively
329  * short queue flush time.  Don't queue works which can run for too
330  * long.
331  *
332  * system_highpri_wq is similar to system_wq but for work items which
333  * require WQ_HIGHPRI.
334  *
335  * system_long_wq is similar to system_wq but may host long running
336  * works.  Queue flushing might take relatively long.
337  *
338  * system_unbound_wq is unbound workqueue.  Workers are not bound to
339  * any specific CPU, not concurrency managed, and all queued works are
340  * executed immediately as long as max_active limit is not reached and
341  * resources are available.
342  *
343  * system_freezable_wq is equivalent to system_wq except that it's
344  * freezable.
345  *
346  * *_power_efficient_wq are inclined towards saving power and converted
347  * into WQ_UNBOUND variants if 'wq_power_efficient' is enabled; otherwise,
348  * they are same as their non-power-efficient counterparts - e.g.
349  * system_power_efficient_wq is identical to system_wq if
350  * 'wq_power_efficient' is disabled.  See WQ_POWER_EFFICIENT for more info.
351  */
352 extern struct workqueue_struct *system_wq;
353 extern struct workqueue_struct *system_highpri_wq;
354 extern struct workqueue_struct *system_long_wq;
355 extern struct workqueue_struct *system_unbound_wq;
356 extern struct workqueue_struct *system_freezable_wq;
357 extern struct workqueue_struct *system_power_efficient_wq;
358 extern struct workqueue_struct *system_freezable_power_efficient_wq;
359 
360 extern struct workqueue_struct *
361 __alloc_workqueue_key(const char *fmt, unsigned int flags, int max_active,
362         struct lock_class_key *key, const char *lock_name, ...) __printf(1, 6);
363 
364 /**
365  * alloc_workqueue - allocate a workqueue
366  * @fmt: printf format for the name of the workqueue
367  * @flags: WQ_* flags
368  * @max_active: max in-flight work items, 0 for default
369  * @args: args for @fmt
370  *
371  * Allocate a workqueue with the specified parameters.  For detailed
372  * information on WQ_* flags, please refer to Documentation/workqueue.txt.
373  *
374  * The __lock_name macro dance is to guarantee that single lock_class_key
375  * doesn't end up with different namesm, which isn't allowed by lockdep.
376  *
377  * RETURNS:
378  * Pointer to the allocated workqueue on success, %NULL on failure.
379  */
380 #ifdef CONFIG_LOCKDEP
381 #define alloc_workqueue(fmt, flags, max_active, args...)                \
382 ({                                                                      \
383         static struct lock_class_key __key;                             \
384         const char *__lock_name;                                        \
385                                                                         \
386         __lock_name = #fmt#args;                                        \
387                                                                         \
388         __alloc_workqueue_key((fmt), (flags), (max_active),             \
389                               &__key, __lock_name, ##args);             \
390 })
391 #else
392 #define alloc_workqueue(fmt, flags, max_active, args...)                \
393         __alloc_workqueue_key((fmt), (flags), (max_active),             \
394                               NULL, NULL, ##args)
395 #endif
396 
397 /**
398  * alloc_ordered_workqueue - allocate an ordered workqueue
399  * @fmt: printf format for the name of the workqueue
400  * @flags: WQ_* flags (only WQ_FREEZABLE and WQ_MEM_RECLAIM are meaningful)
401  * @args: args for @fmt
402  *
403  * Allocate an ordered workqueue.  An ordered workqueue executes at
404  * most one work item at any given time in the queued order.  They are
405  * implemented as unbound workqueues with @max_active of one.
406  *
407  * RETURNS:
408  * Pointer to the allocated workqueue on success, %NULL on failure.
409  */
410 #define alloc_ordered_workqueue(fmt, flags, args...)                    \
411         alloc_workqueue(fmt, WQ_UNBOUND | __WQ_ORDERED | (flags), 1, ##args)
412 
413 #define create_workqueue(name)                                          \
414         alloc_workqueue("%s", WQ_MEM_RECLAIM, 1, (name))
415 #define create_freezable_workqueue(name)                                \
416         alloc_workqueue("%s", WQ_FREEZABLE | WQ_UNBOUND | WQ_MEM_RECLAIM, \
417                         1, (name))
418 #define create_singlethread_workqueue(name)                             \
419         alloc_ordered_workqueue("%s", WQ_MEM_RECLAIM, name)
420 
421 extern void destroy_workqueue(struct workqueue_struct *wq);
422 
423 struct workqueue_attrs *alloc_workqueue_attrs(gfp_t gfp_mask);
424 void free_workqueue_attrs(struct workqueue_attrs *attrs);
425 int apply_workqueue_attrs(struct workqueue_struct *wq,
426                           const struct workqueue_attrs *attrs);
427 
428 extern bool queue_work_on(int cpu, struct workqueue_struct *wq,
429                         struct work_struct *work);
430 extern bool queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
431                         struct delayed_work *work, unsigned long delay);
432 extern bool mod_delayed_work_on(int cpu, struct workqueue_struct *wq,
433                         struct delayed_work *dwork, unsigned long delay);
434 
435 extern void flush_workqueue(struct workqueue_struct *wq);
436 extern void drain_workqueue(struct workqueue_struct *wq);
437 extern void flush_scheduled_work(void);
438 
439 extern int schedule_on_each_cpu(work_func_t func);
440 
441 int execute_in_process_context(work_func_t fn, struct execute_work *);
442 
443 extern bool flush_work(struct work_struct *work);
444 extern bool cancel_work_sync(struct work_struct *work);
445 
446 extern bool flush_delayed_work(struct delayed_work *dwork);
447 extern bool cancel_delayed_work(struct delayed_work *dwork);
448 extern bool cancel_delayed_work_sync(struct delayed_work *dwork);
449 
450 extern void workqueue_set_max_active(struct workqueue_struct *wq,
451                                      int max_active);
452 extern bool current_is_workqueue_rescuer(void);
453 extern bool workqueue_congested(int cpu, struct workqueue_struct *wq);
454 extern unsigned int work_busy(struct work_struct *work);
455 extern __printf(1, 2) void set_worker_desc(const char *fmt, ...);
456 extern void print_worker_info(const char *log_lvl, struct task_struct *task);
457 
458 /**
459  * queue_work - queue work on a workqueue
460  * @wq: workqueue to use
461  * @work: work to queue
462  *
463  * Returns %false if @work was already on a queue, %true otherwise.
464  *
465  * We queue the work to the CPU on which it was submitted, but if the CPU dies
466  * it can be processed by another CPU.
467  */
468 static inline bool queue_work(struct workqueue_struct *wq,
469                               struct work_struct *work)
470 {
471         return queue_work_on(WORK_CPU_UNBOUND, wq, work);
472 }
473 
474 /**
475  * queue_delayed_work - queue work on a workqueue after delay
476  * @wq: workqueue to use
477  * @dwork: delayable work to queue
478  * @delay: number of jiffies to wait before queueing
479  *
480  * Equivalent to queue_delayed_work_on() but tries to use the local CPU.
481  */
482 static inline bool queue_delayed_work(struct workqueue_struct *wq,
483                                       struct delayed_work *dwork,
484                                       unsigned long delay)
485 {
486         return queue_delayed_work_on(WORK_CPU_UNBOUND, wq, dwork, delay);
487 }
488 
489 /**
490  * mod_delayed_work - modify delay of or queue a delayed work
491  * @wq: workqueue to use
492  * @dwork: work to queue
493  * @delay: number of jiffies to wait before queueing
494  *
495  * mod_delayed_work_on() on local CPU.
496  */
497 static inline bool mod_delayed_work(struct workqueue_struct *wq,
498                                     struct delayed_work *dwork,
499                                     unsigned long delay)
500 {
501         return mod_delayed_work_on(WORK_CPU_UNBOUND, wq, dwork, delay);
502 }
503 
504 /**
505  * schedule_work_on - put work task on a specific cpu
506  * @cpu: cpu to put the work task on
507  * @work: job to be done
508  *
509  * This puts a job on a specific cpu
510  */
511 static inline bool schedule_work_on(int cpu, struct work_struct *work)
512 {
513         return queue_work_on(cpu, system_wq, work);
514 }
515 
516 /**
517  * schedule_work - put work task in global workqueue
518  * @work: job to be done
519  *
520  * Returns %false if @work was already on the kernel-global workqueue and
521  * %true otherwise.
522  *
523  * This puts a job in the kernel-global workqueue if it was not already
524  * queued and leaves it in the same position on the kernel-global
525  * workqueue otherwise.
526  */
527 static inline bool schedule_work(struct work_struct *work)
528 {
529         return queue_work(system_wq, work);
530 }
531 
532 /**
533  * schedule_delayed_work_on - queue work in global workqueue on CPU after delay
534  * @cpu: cpu to use
535  * @dwork: job to be done
536  * @delay: number of jiffies to wait
537  *
538  * After waiting for a given time this puts a job in the kernel-global
539  * workqueue on the specified CPU.
540  */
541 static inline bool schedule_delayed_work_on(int cpu, struct delayed_work *dwork,
542                                             unsigned long delay)
543 {
544         return queue_delayed_work_on(cpu, system_wq, dwork, delay);
545 }
546 
547 /**
548  * schedule_delayed_work - put work task in global workqueue after delay
549  * @dwork: job to be done
550  * @delay: number of jiffies to wait or 0 for immediate execution
551  *
552  * After waiting for a given time this puts a job in the kernel-global
553  * workqueue.
554  */
555 static inline bool schedule_delayed_work(struct delayed_work *dwork,
556                                          unsigned long delay)
557 {
558         return queue_delayed_work(system_wq, dwork, delay);
559 }
560 
561 /**
562  * keventd_up - is workqueue initialized yet?
563  */
564 static inline bool keventd_up(void)
565 {
566         return system_wq != NULL;
567 }
568 
569 #ifndef CONFIG_SMP
570 static inline long work_on_cpu(int cpu, long (*fn)(void *), void *arg)
571 {
572         return fn(arg);
573 }
574 #else
575 long work_on_cpu(int cpu, long (*fn)(void *), void *arg);
576 #endif /* CONFIG_SMP */
577 
578 #ifdef CONFIG_FREEZER
579 extern void freeze_workqueues_begin(void);
580 extern bool freeze_workqueues_busy(void);
581 extern void thaw_workqueues(void);
582 #endif /* CONFIG_FREEZER */
583 
584 #ifdef CONFIG_SYSFS
585 int workqueue_sysfs_register(struct workqueue_struct *wq);
586 #else   /* CONFIG_SYSFS */
587 static inline int workqueue_sysfs_register(struct workqueue_struct *wq)
588 { return 0; }
589 #endif  /* CONFIG_SYSFS */
590 
591 #endif
592 

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