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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     = (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         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         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
595 

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