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CommitLineData
1da177e4
LT
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>
4e6045f1 11#include <linux/lockdep.h>
7a22ad75 12#include <linux/threads.h>
60063497 13#include <linux/atomic.h>
7a4e344c 14#include <linux/cpumask.h>
1da177e4
LT
15
16struct workqueue_struct;
17
65f27f38
DH
18struct work_struct;
19typedef void (*work_func_t)(struct work_struct *work);
d8e794df 20void delayed_work_timer_fn(unsigned long __data);
6bb49e59 21
a08727ba
LT
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
22df02bb
TH
28enum {
29 WORK_STRUCT_PENDING_BIT = 0, /* work item is pending execution */
8a2e8e5d 30 WORK_STRUCT_DELAYED_BIT = 1, /* work item is delayed */
112202d9 31 WORK_STRUCT_PWQ_BIT = 2, /* data points to pwq */
8a2e8e5d 32 WORK_STRUCT_LINKED_BIT = 3, /* next work is linked to this one */
22df02bb 33#ifdef CONFIG_DEBUG_OBJECTS_WORK
8a2e8e5d
TH
34 WORK_STRUCT_STATIC_BIT = 4, /* static initializer (debugobjects) */
35 WORK_STRUCT_COLOR_SHIFT = 5, /* color for workqueue flushing */
0f900049 36#else
8a2e8e5d 37 WORK_STRUCT_COLOR_SHIFT = 4, /* color for workqueue flushing */
22df02bb
TH
38#endif
39
73f53c4a
TH
40 WORK_STRUCT_COLOR_BITS = 4,
41
22df02bb 42 WORK_STRUCT_PENDING = 1 << WORK_STRUCT_PENDING_BIT,
8a2e8e5d 43 WORK_STRUCT_DELAYED = 1 << WORK_STRUCT_DELAYED_BIT,
112202d9 44 WORK_STRUCT_PWQ = 1 << WORK_STRUCT_PWQ_BIT,
affee4b2 45 WORK_STRUCT_LINKED = 1 << WORK_STRUCT_LINKED_BIT,
22df02bb
TH
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
73f53c4a
TH
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
bdbc5dd7 59 /* special cpu IDs */
f3421797 60 WORK_CPU_UNBOUND = NR_CPUS,
6be19588 61 WORK_CPU_END = NR_CPUS + 1,
bdbc5dd7 62
73f53c4a 63 /*
112202d9
TH
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.
73f53c4a
TH
67 */
68 WORK_STRUCT_FLAG_BITS = WORK_STRUCT_COLOR_SHIFT +
69 WORK_STRUCT_COLOR_BITS,
70
112202d9 71 /* data contains off-queue information when !WORK_STRUCT_PWQ */
45d9550a 72 WORK_OFFQ_FLAG_BASE = WORK_STRUCT_COLOR_SHIFT,
bbb68dfa
TH
73
74 WORK_OFFQ_CANCELING = (1 << WORK_OFFQ_FLAG_BASE),
75
715b06b8
TH
76 /*
77 * When a work item is off queue, its high bits point to the last
7c3eed5c
TH
78 * pool it was on. Cap at 31 bits and use the highest number to
79 * indicate that no pool is associated.
715b06b8 80 */
bbb68dfa 81 WORK_OFFQ_FLAG_BITS = 1,
7c3eed5c
TH
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,
b5490077
TH
86
87 /* convenience constants */
0f900049 88 WORK_STRUCT_FLAG_MASK = (1UL << WORK_STRUCT_FLAG_BITS) - 1,
22df02bb 89 WORK_STRUCT_WQ_DATA_MASK = ~WORK_STRUCT_FLAG_MASK,
7c3eed5c 90 WORK_STRUCT_NO_POOL = (unsigned long)WORK_OFFQ_POOL_NONE << WORK_OFFQ_POOL_SHIFT,
dcd989cb
TH
91
92 /* bit mask for work_busy() return values */
93 WORK_BUSY_PENDING = 1 << 0,
94 WORK_BUSY_RUNNING = 1 << 1,
22df02bb
TH
95};
96
1da177e4 97struct work_struct {
a08727ba 98 atomic_long_t data;
1da177e4 99 struct list_head entry;
6bb49e59 100 work_func_t func;
4e6045f1
JB
101#ifdef CONFIG_LOCKDEP
102 struct lockdep_map lockdep_map;
103#endif
52bad64d
DH
104};
105
7c3eed5c 106#define WORK_DATA_INIT() ATOMIC_LONG_INIT(WORK_STRUCT_NO_POOL)
7a22ad75 107#define WORK_DATA_STATIC_INIT() \
7c3eed5c 108 ATOMIC_LONG_INIT(WORK_STRUCT_NO_POOL | WORK_STRUCT_STATIC)
a08727ba 109
52bad64d
DH
110struct delayed_work {
111 struct work_struct work;
1da177e4 112 struct timer_list timer;
60c057bc
LJ
113
114 /* target workqueue and CPU ->timer uses to queue ->work */
115 struct workqueue_struct *wq;
1265057f 116 int cpu;
1da177e4
LT
117};
118
7a4e344c
TH
119/*
120 * A struct for workqueue attributes. This can be used to change
121 * attributes of an unbound workqueue.
d55262c4
TH
122 *
123 * Unlike other fields, ->no_numa isn't a property of a worker_pool. It
124 * only modifies how apply_workqueue_attrs() select pools and thus doesn't
125 * participate in pool hash calculations or equality comparisons.
7a4e344c
TH
126 */
127struct workqueue_attrs {
128 int nice; /* nice level */
129 cpumask_var_t cpumask; /* allowed CPUs */
d55262c4 130 bool no_numa; /* disable NUMA affinity */
7a4e344c
TH
131};
132
bf6aede7
JD
133static inline struct delayed_work *to_delayed_work(struct work_struct *work)
134{
135 return container_of(work, struct delayed_work, work);
136}
137
1fa44eca
JB
138struct execute_work {
139 struct work_struct work;
140};
141
4e6045f1
JB
142#ifdef CONFIG_LOCKDEP
143/*
144 * NB: because we have to copy the lockdep_map, setting _key
145 * here is required, otherwise it could get initialised to the
146 * copy of the lockdep_map!
147 */
148#define __WORK_INIT_LOCKDEP_MAP(n, k) \
149 .lockdep_map = STATIC_LOCKDEP_MAP_INIT(n, k),
150#else
151#define __WORK_INIT_LOCKDEP_MAP(n, k)
152#endif
153
ee64e7f6
TH
154#define __WORK_INITIALIZER(n, f) { \
155 .data = WORK_DATA_STATIC_INIT(), \
156 .entry = { &(n).entry, &(n).entry }, \
157 .func = (f), \
158 __WORK_INIT_LOCKDEP_MAP(#n, &(n)) \
65f27f38
DH
159 }
160
f991b318 161#define __DELAYED_WORK_INITIALIZER(n, f, tflags) { \
ee64e7f6 162 .work = __WORK_INITIALIZER((n).work, (f)), \
f991b318 163 .timer = __TIMER_INITIALIZER(delayed_work_timer_fn, \
e0aecdd8
TH
164 0, (unsigned long)&(n), \
165 (tflags) | TIMER_IRQSAFE), \
dd6414b5
PC
166 }
167
ee64e7f6 168#define DECLARE_WORK(n, f) \
65f27f38
DH
169 struct work_struct n = __WORK_INITIALIZER(n, f)
170
ee64e7f6 171#define DECLARE_DELAYED_WORK(n, f) \
f991b318 172 struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f, 0)
65f27f38 173
203b42f7 174#define DECLARE_DEFERRABLE_WORK(n, f) \
f991b318 175 struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f, TIMER_DEFERRABLE)
dd6414b5 176
1da177e4 177/*
65f27f38 178 * initialize a work item's function pointer
1da177e4 179 */
ee64e7f6
TH
180#define PREPARE_WORK(_work, _func) \
181 do { \
182 (_work)->func = (_func); \
1da177e4
LT
183 } while (0)
184
ee64e7f6 185#define PREPARE_DELAYED_WORK(_work, _func) \
65f27f38 186 PREPARE_WORK(&(_work)->work, (_func))
52bad64d 187
dc186ad7
TG
188#ifdef CONFIG_DEBUG_OBJECTS_WORK
189extern void __init_work(struct work_struct *work, int onstack);
190extern void destroy_work_on_stack(struct work_struct *work);
4690c4ab
TH
191static inline unsigned int work_static(struct work_struct *work)
192{
22df02bb 193 return *work_data_bits(work) & WORK_STRUCT_STATIC;
4690c4ab 194}
dc186ad7
TG
195#else
196static inline void __init_work(struct work_struct *work, int onstack) { }
197static inline void destroy_work_on_stack(struct work_struct *work) { }
4690c4ab 198static inline unsigned int work_static(struct work_struct *work) { return 0; }
dc186ad7
TG
199#endif
200
1da177e4 201/*
52bad64d 202 * initialize all of a work item in one go
a08727ba 203 *
b9049df5 204 * NOTE! No point in using "atomic_long_set()": using a direct
a08727ba
LT
205 * assignment of the work data initializer allows the compiler
206 * to generate better code.
1da177e4 207 */
4e6045f1 208#ifdef CONFIG_LOCKDEP
dc186ad7 209#define __INIT_WORK(_work, _func, _onstack) \
65f27f38 210 do { \
4e6045f1
JB
211 static struct lock_class_key __key; \
212 \
dc186ad7 213 __init_work((_work), _onstack); \
23b2e599 214 (_work)->data = (atomic_long_t) WORK_DATA_INIT(); \
ee64e7f6 215 lockdep_init_map(&(_work)->lockdep_map, #_work, &__key, 0); \
65f27f38
DH
216 INIT_LIST_HEAD(&(_work)->entry); \
217 PREPARE_WORK((_work), (_func)); \
218 } while (0)
4e6045f1 219#else
dc186ad7 220#define __INIT_WORK(_work, _func, _onstack) \
4e6045f1 221 do { \
dc186ad7 222 __init_work((_work), _onstack); \
4e6045f1
JB
223 (_work)->data = (atomic_long_t) WORK_DATA_INIT(); \
224 INIT_LIST_HEAD(&(_work)->entry); \
225 PREPARE_WORK((_work), (_func)); \
226 } while (0)
227#endif
65f27f38 228
ee64e7f6
TH
229#define INIT_WORK(_work, _func) \
230 do { \
231 __INIT_WORK((_work), (_func), 0); \
dc186ad7
TG
232 } while (0)
233
ee64e7f6
TH
234#define INIT_WORK_ONSTACK(_work, _func) \
235 do { \
236 __INIT_WORK((_work), (_func), 1); \
dc186ad7
TG
237 } while (0)
238
f991b318 239#define __INIT_DELAYED_WORK(_work, _func, _tflags) \
ee64e7f6
TH
240 do { \
241 INIT_WORK(&(_work)->work, (_func)); \
f991b318 242 __setup_timer(&(_work)->timer, delayed_work_timer_fn, \
e0aecdd8
TH
243 (unsigned long)(_work), \
244 (_tflags) | TIMER_IRQSAFE); \
52bad64d
DH
245 } while (0)
246
f991b318 247#define __INIT_DELAYED_WORK_ONSTACK(_work, _func, _tflags) \
ee64e7f6
TH
248 do { \
249 INIT_WORK_ONSTACK(&(_work)->work, (_func)); \
f991b318
TH
250 __setup_timer_on_stack(&(_work)->timer, \
251 delayed_work_timer_fn, \
252 (unsigned long)(_work), \
e0aecdd8 253 (_tflags) | TIMER_IRQSAFE); \
6d612b0f
PZ
254 } while (0)
255
f991b318
TH
256#define INIT_DELAYED_WORK(_work, _func) \
257 __INIT_DELAYED_WORK(_work, _func, 0)
258
259#define INIT_DELAYED_WORK_ONSTACK(_work, _func) \
260 __INIT_DELAYED_WORK_ONSTACK(_work, _func, 0)
261
203b42f7 262#define INIT_DEFERRABLE_WORK(_work, _func) \
f991b318
TH
263 __INIT_DELAYED_WORK(_work, _func, TIMER_DEFERRABLE)
264
265#define INIT_DEFERRABLE_WORK_ONSTACK(_work, _func) \
266 __INIT_DELAYED_WORK_ONSTACK(_work, _func, TIMER_DEFERRABLE)
28287033 267
365970a1
DH
268/**
269 * work_pending - Find out whether a work item is currently pending
270 * @work: The work item in question
271 */
272#define work_pending(work) \
22df02bb 273 test_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))
365970a1
DH
274
275/**
276 * delayed_work_pending - Find out whether a delayable work item is currently
277 * pending
278 * @work: The work item in question
279 */
0221872a
LT
280#define delayed_work_pending(w) \
281 work_pending(&(w)->work)
365970a1 282
65f27f38 283/**
23b2e599
ON
284 * work_clear_pending - for internal use only, mark a work item as not pending
285 * @work: The work item in question
65f27f38 286 */
23b2e599 287#define work_clear_pending(work) \
22df02bb 288 clear_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))
65f27f38 289
c54fce6e
TH
290/*
291 * Workqueue flags and constants. For details, please refer to
292 * Documentation/workqueue.txt.
293 */
97e37d7b 294enum {
bdbc5dd7 295 WQ_NON_REENTRANT = 1 << 0, /* guarantee non-reentrance */
c7fc77f7 296 WQ_UNBOUND = 1 << 1, /* not bound to any cpu */
58a69cb4 297 WQ_FREEZABLE = 1 << 2, /* freeze during suspend */
6370a6ad 298 WQ_MEM_RECLAIM = 1 << 3, /* may be used for memory reclaim */
649027d7 299 WQ_HIGHPRI = 1 << 4, /* high priority */
fb0e7beb 300 WQ_CPU_INTENSIVE = 1 << 5, /* cpu instensive workqueue */
226223ab 301 WQ_SYSFS = 1 << 6, /* visible in sysfs, see wq_sysfs_register() */
b71ab8c2 302
618b01eb 303 __WQ_DRAINING = 1 << 16, /* internal: workqueue is draining */
8719dcea 304 __WQ_ORDERED = 1 << 17, /* internal: workqueue is ordered */
e41e704b 305
b71ab8c2 306 WQ_MAX_ACTIVE = 512, /* I like 512, better ideas? */
f3421797 307 WQ_MAX_UNBOUND_PER_CPU = 4, /* 4 * #cpus for unbound wq */
b71ab8c2 308 WQ_DFL_ACTIVE = WQ_MAX_ACTIVE / 2,
97e37d7b 309};
52bad64d 310
f3421797
TH
311/* unbound wq's aren't per-cpu, scale max_active according to #cpus */
312#define WQ_UNBOUND_MAX_ACTIVE \
313 max_t(int, WQ_MAX_ACTIVE, num_possible_cpus() * WQ_MAX_UNBOUND_PER_CPU)
65f27f38 314
d320c038
TH
315/*
316 * System-wide workqueues which are always present.
317 *
318 * system_wq is the one used by schedule[_delayed]_work[_on]().
319 * Multi-CPU multi-threaded. There are users which expect relatively
320 * short queue flush time. Don't queue works which can run for too
321 * long.
322 *
323 * system_long_wq is similar to system_wq but may host long running
324 * works. Queue flushing might take relatively long.
325 *
f3421797
TH
326 * system_unbound_wq is unbound workqueue. Workers are not bound to
327 * any specific CPU, not concurrency managed, and all queued works are
328 * executed immediately as long as max_active limit is not reached and
329 * resources are available.
4149efb2 330 *
24d51add
TH
331 * system_freezable_wq is equivalent to system_wq except that it's
332 * freezable.
d320c038
TH
333 */
334extern struct workqueue_struct *system_wq;
335extern struct workqueue_struct *system_long_wq;
f3421797 336extern struct workqueue_struct *system_unbound_wq;
24d51add 337extern struct workqueue_struct *system_freezable_wq;
ae930e0f 338
3b07e9ca 339static inline struct workqueue_struct * __deprecated __system_nrt_wq(void)
ae930e0f
TH
340{
341 return system_wq;
342}
343
3b07e9ca 344static inline struct workqueue_struct * __deprecated __system_nrt_freezable_wq(void)
ae930e0f
TH
345{
346 return system_freezable_wq;
347}
348
349/* equivlalent to system_wq and system_freezable_wq, deprecated */
350#define system_nrt_wq __system_nrt_wq()
351#define system_nrt_freezable_wq __system_nrt_freezable_wq()
52bad64d 352
4e6045f1 353extern struct workqueue_struct *
b196be89
TH
354__alloc_workqueue_key(const char *fmt, unsigned int flags, int max_active,
355 struct lock_class_key *key, const char *lock_name, ...) __printf(1, 6);
4e6045f1 356
b196be89
TH
357/**
358 * alloc_workqueue - allocate a workqueue
359 * @fmt: printf format for the name of the workqueue
360 * @flags: WQ_* flags
361 * @max_active: max in-flight work items, 0 for default
362 * @args: args for @fmt
363 *
364 * Allocate a workqueue with the specified parameters. For detailed
365 * information on WQ_* flags, please refer to Documentation/workqueue.txt.
366 *
367 * The __lock_name macro dance is to guarantee that single lock_class_key
368 * doesn't end up with different namesm, which isn't allowed by lockdep.
369 *
370 * RETURNS:
371 * Pointer to the allocated workqueue on success, %NULL on failure.
372 */
4e6045f1 373#ifdef CONFIG_LOCKDEP
ee64e7f6
TH
374#define alloc_workqueue(fmt, flags, max_active, args...) \
375({ \
376 static struct lock_class_key __key; \
377 const char *__lock_name; \
378 \
379 if (__builtin_constant_p(fmt)) \
380 __lock_name = (fmt); \
381 else \
382 __lock_name = #fmt; \
383 \
384 __alloc_workqueue_key((fmt), (flags), (max_active), \
385 &__key, __lock_name, ##args); \
4e6045f1
JB
386})
387#else
ee64e7f6
TH
388#define alloc_workqueue(fmt, flags, max_active, args...) \
389 __alloc_workqueue_key((fmt), (flags), (max_active), \
b196be89 390 NULL, NULL, ##args)
4e6045f1
JB
391#endif
392
81dcaf65
TH
393/**
394 * alloc_ordered_workqueue - allocate an ordered workqueue
b196be89 395 * @fmt: printf format for the name of the workqueue
58a69cb4 396 * @flags: WQ_* flags (only WQ_FREEZABLE and WQ_MEM_RECLAIM are meaningful)
b196be89 397 * @args: args for @fmt
81dcaf65
TH
398 *
399 * Allocate an ordered workqueue. An ordered workqueue executes at
400 * most one work item at any given time in the queued order. They are
401 * implemented as unbound workqueues with @max_active of one.
402 *
403 * RETURNS:
404 * Pointer to the allocated workqueue on success, %NULL on failure.
405 */
ee64e7f6 406#define alloc_ordered_workqueue(fmt, flags, args...) \
8719dcea 407 alloc_workqueue(fmt, WQ_UNBOUND | __WQ_ORDERED | (flags), 1, ##args)
81dcaf65 408
ee64e7f6 409#define create_workqueue(name) \
6370a6ad 410 alloc_workqueue((name), WQ_MEM_RECLAIM, 1)
ee64e7f6 411#define create_freezable_workqueue(name) \
58a69cb4 412 alloc_workqueue((name), WQ_FREEZABLE | WQ_UNBOUND | WQ_MEM_RECLAIM, 1)
ee64e7f6 413#define create_singlethread_workqueue(name) \
6370a6ad 414 alloc_workqueue((name), WQ_UNBOUND | WQ_MEM_RECLAIM, 1)
1da177e4
LT
415
416extern void destroy_workqueue(struct workqueue_struct *wq);
417
7a4e344c
TH
418struct workqueue_attrs *alloc_workqueue_attrs(gfp_t gfp_mask);
419void free_workqueue_attrs(struct workqueue_attrs *attrs);
9e8cd2f5
TH
420int apply_workqueue_attrs(struct workqueue_struct *wq,
421 const struct workqueue_attrs *attrs);
7a4e344c 422
d4283e93 423extern bool queue_work_on(int cpu, struct workqueue_struct *wq,
c1a220e7 424 struct work_struct *work);
d4283e93 425extern bool queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
28e53bdd 426 struct delayed_work *work, unsigned long delay);
8376fe22
TH
427extern bool mod_delayed_work_on(int cpu, struct workqueue_struct *wq,
428 struct delayed_work *dwork, unsigned long delay);
28e53bdd 429
b3c97528 430extern void flush_workqueue(struct workqueue_struct *wq);
9c5a2ba7 431extern void drain_workqueue(struct workqueue_struct *wq);
28e53bdd 432extern void flush_scheduled_work(void);
1da177e4 433
65f27f38 434extern int schedule_on_each_cpu(work_func_t func);
1da177e4 435
65f27f38 436int execute_in_process_context(work_func_t fn, struct execute_work *);
1da177e4 437
401a8d04
TH
438extern bool flush_work(struct work_struct *work);
439extern bool cancel_work_sync(struct work_struct *work);
440
441extern bool flush_delayed_work(struct delayed_work *dwork);
57b30ae7 442extern bool cancel_delayed_work(struct delayed_work *dwork);
401a8d04 443extern bool cancel_delayed_work_sync(struct delayed_work *dwork);
28e53bdd 444
dcd989cb
TH
445extern void workqueue_set_max_active(struct workqueue_struct *wq,
446 int max_active);
e6267616 447extern bool current_is_workqueue_rescuer(void);
d84ff051 448extern bool workqueue_congested(int cpu, struct workqueue_struct *wq);
dcd989cb
TH
449extern unsigned int work_busy(struct work_struct *work);
450
8425e3d5
TH
451/**
452 * queue_work - queue work on a workqueue
453 * @wq: workqueue to use
454 * @work: work to queue
455 *
456 * Returns %false if @work was already on a queue, %true otherwise.
457 *
458 * We queue the work to the CPU on which it was submitted, but if the CPU dies
459 * it can be processed by another CPU.
460 */
461static inline bool queue_work(struct workqueue_struct *wq,
462 struct work_struct *work)
463{
464 return queue_work_on(WORK_CPU_UNBOUND, wq, work);
465}
466
467/**
468 * queue_delayed_work - queue work on a workqueue after delay
469 * @wq: workqueue to use
470 * @dwork: delayable work to queue
471 * @delay: number of jiffies to wait before queueing
472 *
473 * Equivalent to queue_delayed_work_on() but tries to use the local CPU.
474 */
475static inline bool queue_delayed_work(struct workqueue_struct *wq,
476 struct delayed_work *dwork,
477 unsigned long delay)
478{
479 return queue_delayed_work_on(WORK_CPU_UNBOUND, wq, dwork, delay);
480}
481
482/**
483 * mod_delayed_work - modify delay of or queue a delayed work
484 * @wq: workqueue to use
485 * @dwork: work to queue
486 * @delay: number of jiffies to wait before queueing
487 *
488 * mod_delayed_work_on() on local CPU.
489 */
490static inline bool mod_delayed_work(struct workqueue_struct *wq,
491 struct delayed_work *dwork,
492 unsigned long delay)
493{
494 return mod_delayed_work_on(WORK_CPU_UNBOUND, wq, dwork, delay);
495}
496
497/**
498 * schedule_work_on - put work task on a specific cpu
499 * @cpu: cpu to put the work task on
500 * @work: job to be done
501 *
502 * This puts a job on a specific cpu
503 */
504static inline bool schedule_work_on(int cpu, struct work_struct *work)
505{
506 return queue_work_on(cpu, system_wq, work);
507}
508
509/**
510 * schedule_work - put work task in global workqueue
511 * @work: job to be done
512 *
513 * Returns %false if @work was already on the kernel-global workqueue and
514 * %true otherwise.
515 *
516 * This puts a job in the kernel-global workqueue if it was not already
517 * queued and leaves it in the same position on the kernel-global
518 * workqueue otherwise.
519 */
520static inline bool schedule_work(struct work_struct *work)
521{
522 return queue_work(system_wq, work);
523}
524
525/**
526 * schedule_delayed_work_on - queue work in global workqueue on CPU after delay
527 * @cpu: cpu to use
528 * @dwork: job to be done
529 * @delay: number of jiffies to wait
530 *
531 * After waiting for a given time this puts a job in the kernel-global
532 * workqueue on the specified CPU.
533 */
534static inline bool schedule_delayed_work_on(int cpu, struct delayed_work *dwork,
535 unsigned long delay)
536{
537 return queue_delayed_work_on(cpu, system_wq, dwork, delay);
538}
539
540/**
541 * schedule_delayed_work - put work task in global workqueue after delay
542 * @dwork: job to be done
543 * @delay: number of jiffies to wait or 0 for immediate execution
544 *
545 * After waiting for a given time this puts a job in the kernel-global
546 * workqueue.
547 */
548static inline bool schedule_delayed_work(struct delayed_work *dwork,
549 unsigned long delay)
550{
551 return queue_delayed_work(system_wq, dwork, delay);
552}
553
554/**
555 * keventd_up - is workqueue initialized yet?
556 */
557static inline bool keventd_up(void)
558{
559 return system_wq != NULL;
560}
561
4e49627b
ON
562/*
563 * Like above, but uses del_timer() instead of del_timer_sync(). This means,
564 * if it returns 0 the timer function may be running and the queueing is in
565 * progress.
566 */
136b5721 567static inline bool __deprecated __cancel_delayed_work(struct delayed_work *work)
4e49627b 568{
401a8d04 569 bool ret;
4e49627b
ON
570
571 ret = del_timer(&work->timer);
572 if (ret)
573 work_clear_pending(&work->work);
574 return ret;
575}
576
606a5020 577/* used to be different but now identical to flush_work(), deprecated */
43829731 578static inline bool __deprecated flush_work_sync(struct work_struct *work)
606a5020
TH
579{
580 return flush_work(work);
581}
582
583/* used to be different but now identical to flush_delayed_work(), deprecated */
43829731 584static inline bool __deprecated flush_delayed_work_sync(struct delayed_work *dwork)
606a5020
TH
585{
586 return flush_delayed_work(dwork);
587}
588
2d3854a3 589#ifndef CONFIG_SMP
d84ff051 590static inline long work_on_cpu(int cpu, long (*fn)(void *), void *arg)
2d3854a3
RR
591{
592 return fn(arg);
593}
594#else
d84ff051 595long work_on_cpu(int cpu, long (*fn)(void *), void *arg);
2d3854a3 596#endif /* CONFIG_SMP */
a25909a4 597
a0a1a5fd
TH
598#ifdef CONFIG_FREEZER
599extern void freeze_workqueues_begin(void);
600extern bool freeze_workqueues_busy(void);
601extern void thaw_workqueues(void);
602#endif /* CONFIG_FREEZER */
603
226223ab
TH
604#ifdef CONFIG_SYSFS
605int workqueue_sysfs_register(struct workqueue_struct *wq);
606#else /* CONFIG_SYSFS */
607static inline int workqueue_sysfs_register(struct workqueue_struct *wq)
608{ return 0; }
609#endif /* CONFIG_SYSFS */
610
1da177e4 611#endif