11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * workqueue.h --- work queue handling for Linux. 31da177e4SLinus Torvalds */ 41da177e4SLinus Torvalds 51da177e4SLinus Torvalds #ifndef _LINUX_WORKQUEUE_H 61da177e4SLinus Torvalds #define _LINUX_WORKQUEUE_H 71da177e4SLinus Torvalds 81da177e4SLinus Torvalds #include <linux/timer.h> 91da177e4SLinus Torvalds #include <linux/linkage.h> 101da177e4SLinus Torvalds #include <linux/bitops.h> 114e6045f1SJohannes Berg #include <linux/lockdep.h> 127a22ad75STejun Heo #include <linux/threads.h> 13a08727baSLinus Torvalds #include <asm/atomic.h> 141da177e4SLinus Torvalds 151da177e4SLinus Torvalds struct workqueue_struct; 161da177e4SLinus Torvalds 1765f27f38SDavid Howells struct work_struct; 1865f27f38SDavid Howells typedef void (*work_func_t)(struct work_struct *work); 196bb49e59SDavid Howells 20a08727baSLinus Torvalds /* 21a08727baSLinus Torvalds * The first word is the work queue pointer and the flags rolled into 22a08727baSLinus Torvalds * one 23a08727baSLinus Torvalds */ 24a08727baSLinus Torvalds #define work_data_bits(work) ((unsigned long *)(&(work)->data)) 25a08727baSLinus Torvalds 2622df02bbSTejun Heo enum { 2722df02bbSTejun Heo WORK_STRUCT_PENDING_BIT = 0, /* work item is pending execution */ 28e120153dSTejun Heo WORK_STRUCT_CWQ_BIT = 1, /* data points to cwq */ 29e120153dSTejun Heo WORK_STRUCT_LINKED_BIT = 2, /* next work is linked to this one */ 3022df02bbSTejun Heo #ifdef CONFIG_DEBUG_OBJECTS_WORK 31e120153dSTejun Heo WORK_STRUCT_STATIC_BIT = 3, /* static initializer (debugobjects) */ 32e120153dSTejun Heo WORK_STRUCT_COLOR_SHIFT = 4, /* color for workqueue flushing */ 330f900049STejun Heo #else 34e120153dSTejun Heo WORK_STRUCT_COLOR_SHIFT = 3, /* color for workqueue flushing */ 3522df02bbSTejun Heo #endif 3622df02bbSTejun Heo 3773f53c4aSTejun Heo WORK_STRUCT_COLOR_BITS = 4, 3873f53c4aSTejun Heo 3922df02bbSTejun Heo WORK_STRUCT_PENDING = 1 << WORK_STRUCT_PENDING_BIT, 40e120153dSTejun Heo WORK_STRUCT_CWQ = 1 << WORK_STRUCT_CWQ_BIT, 41affee4b2STejun Heo WORK_STRUCT_LINKED = 1 << WORK_STRUCT_LINKED_BIT, 4222df02bbSTejun Heo #ifdef CONFIG_DEBUG_OBJECTS_WORK 4322df02bbSTejun Heo WORK_STRUCT_STATIC = 1 << WORK_STRUCT_STATIC_BIT, 4422df02bbSTejun Heo #else 4522df02bbSTejun Heo WORK_STRUCT_STATIC = 0, 4622df02bbSTejun Heo #endif 4722df02bbSTejun Heo 4873f53c4aSTejun Heo /* 4973f53c4aSTejun Heo * The last color is no color used for works which don't 5073f53c4aSTejun Heo * participate in workqueue flushing. 5173f53c4aSTejun Heo */ 5273f53c4aSTejun Heo WORK_NR_COLORS = (1 << WORK_STRUCT_COLOR_BITS) - 1, 5373f53c4aSTejun Heo WORK_NO_COLOR = WORK_NR_COLORS, 5473f53c4aSTejun Heo 55bdbc5dd7STejun Heo /* special cpu IDs */ 56f3421797STejun Heo WORK_CPU_UNBOUND = NR_CPUS, 57f3421797STejun Heo WORK_CPU_NONE = NR_CPUS + 1, 58bdbc5dd7STejun Heo WORK_CPU_LAST = WORK_CPU_NONE, 59bdbc5dd7STejun Heo 6073f53c4aSTejun Heo /* 61e120153dSTejun Heo * Reserve 7 bits off of cwq pointer w/ debugobjects turned 62e120153dSTejun Heo * off. This makes cwqs aligned to 128 bytes which isn't too 6373f53c4aSTejun Heo * excessive while allowing 15 workqueue flush colors. 6473f53c4aSTejun Heo */ 6573f53c4aSTejun Heo WORK_STRUCT_FLAG_BITS = WORK_STRUCT_COLOR_SHIFT + 6673f53c4aSTejun Heo WORK_STRUCT_COLOR_BITS, 6773f53c4aSTejun Heo 680f900049STejun Heo WORK_STRUCT_FLAG_MASK = (1UL << WORK_STRUCT_FLAG_BITS) - 1, 6922df02bbSTejun Heo WORK_STRUCT_WQ_DATA_MASK = ~WORK_STRUCT_FLAG_MASK, 70bdbc5dd7STejun Heo WORK_STRUCT_NO_CPU = WORK_CPU_NONE << WORK_STRUCT_FLAG_BITS, 71dcd989cbSTejun Heo 72dcd989cbSTejun Heo /* bit mask for work_busy() return values */ 73dcd989cbSTejun Heo WORK_BUSY_PENDING = 1 << 0, 74dcd989cbSTejun Heo WORK_BUSY_RUNNING = 1 << 1, 7522df02bbSTejun Heo }; 7622df02bbSTejun Heo 771da177e4SLinus Torvalds struct work_struct { 78a08727baSLinus Torvalds atomic_long_t data; 791da177e4SLinus Torvalds struct list_head entry; 806bb49e59SDavid Howells work_func_t func; 814e6045f1SJohannes Berg #ifdef CONFIG_LOCKDEP 824e6045f1SJohannes Berg struct lockdep_map lockdep_map; 834e6045f1SJohannes Berg #endif 8452bad64dSDavid Howells }; 8552bad64dSDavid Howells 867a22ad75STejun Heo #define WORK_DATA_INIT() ATOMIC_LONG_INIT(WORK_STRUCT_NO_CPU) 877a22ad75STejun Heo #define WORK_DATA_STATIC_INIT() \ 887a22ad75STejun Heo ATOMIC_LONG_INIT(WORK_STRUCT_NO_CPU | WORK_STRUCT_STATIC) 89a08727baSLinus Torvalds 9052bad64dSDavid Howells struct delayed_work { 9152bad64dSDavid Howells struct work_struct work; 921da177e4SLinus Torvalds struct timer_list timer; 931da177e4SLinus Torvalds }; 941da177e4SLinus Torvalds 95bf6aede7SJean Delvare static inline struct delayed_work *to_delayed_work(struct work_struct *work) 96bf6aede7SJean Delvare { 97bf6aede7SJean Delvare return container_of(work, struct delayed_work, work); 98bf6aede7SJean Delvare } 99bf6aede7SJean Delvare 1001fa44ecaSJames Bottomley struct execute_work { 1011fa44ecaSJames Bottomley struct work_struct work; 1021fa44ecaSJames Bottomley }; 1031fa44ecaSJames Bottomley 1044e6045f1SJohannes Berg #ifdef CONFIG_LOCKDEP 1054e6045f1SJohannes Berg /* 1064e6045f1SJohannes Berg * NB: because we have to copy the lockdep_map, setting _key 1074e6045f1SJohannes Berg * here is required, otherwise it could get initialised to the 1084e6045f1SJohannes Berg * copy of the lockdep_map! 1094e6045f1SJohannes Berg */ 1104e6045f1SJohannes Berg #define __WORK_INIT_LOCKDEP_MAP(n, k) \ 1114e6045f1SJohannes Berg .lockdep_map = STATIC_LOCKDEP_MAP_INIT(n, k), 1124e6045f1SJohannes Berg #else 1134e6045f1SJohannes Berg #define __WORK_INIT_LOCKDEP_MAP(n, k) 1144e6045f1SJohannes Berg #endif 1154e6045f1SJohannes Berg 11665f27f38SDavid Howells #define __WORK_INITIALIZER(n, f) { \ 117dc186ad7SThomas Gleixner .data = WORK_DATA_STATIC_INIT(), \ 11865f27f38SDavid Howells .entry = { &(n).entry, &(n).entry }, \ 11965f27f38SDavid Howells .func = (f), \ 1204e6045f1SJohannes Berg __WORK_INIT_LOCKDEP_MAP(#n, &(n)) \ 12165f27f38SDavid Howells } 12265f27f38SDavid Howells 12365f27f38SDavid Howells #define __DELAYED_WORK_INITIALIZER(n, f) { \ 12465f27f38SDavid Howells .work = __WORK_INITIALIZER((n).work, (f)), \ 1251da177e4SLinus Torvalds .timer = TIMER_INITIALIZER(NULL, 0, 0), \ 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds 12865f27f38SDavid Howells #define DECLARE_WORK(n, f) \ 12965f27f38SDavid Howells struct work_struct n = __WORK_INITIALIZER(n, f) 13065f27f38SDavid Howells 13165f27f38SDavid Howells #define DECLARE_DELAYED_WORK(n, f) \ 13265f27f38SDavid Howells struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f) 13365f27f38SDavid Howells 1341da177e4SLinus Torvalds /* 13565f27f38SDavid Howells * initialize a work item's function pointer 1361da177e4SLinus Torvalds */ 13765f27f38SDavid Howells #define PREPARE_WORK(_work, _func) \ 1381da177e4SLinus Torvalds do { \ 13952bad64dSDavid Howells (_work)->func = (_func); \ 1401da177e4SLinus Torvalds } while (0) 1411da177e4SLinus Torvalds 14265f27f38SDavid Howells #define PREPARE_DELAYED_WORK(_work, _func) \ 14365f27f38SDavid Howells PREPARE_WORK(&(_work)->work, (_func)) 14452bad64dSDavid Howells 145dc186ad7SThomas Gleixner #ifdef CONFIG_DEBUG_OBJECTS_WORK 146dc186ad7SThomas Gleixner extern void __init_work(struct work_struct *work, int onstack); 147dc186ad7SThomas Gleixner extern void destroy_work_on_stack(struct work_struct *work); 1484690c4abSTejun Heo static inline unsigned int work_static(struct work_struct *work) 1494690c4abSTejun Heo { 15022df02bbSTejun Heo return *work_data_bits(work) & WORK_STRUCT_STATIC; 1514690c4abSTejun Heo } 152dc186ad7SThomas Gleixner #else 153dc186ad7SThomas Gleixner static inline void __init_work(struct work_struct *work, int onstack) { } 154dc186ad7SThomas Gleixner static inline void destroy_work_on_stack(struct work_struct *work) { } 1554690c4abSTejun Heo static inline unsigned int work_static(struct work_struct *work) { return 0; } 156dc186ad7SThomas Gleixner #endif 157dc186ad7SThomas Gleixner 1581da177e4SLinus Torvalds /* 15952bad64dSDavid Howells * initialize all of a work item in one go 160a08727baSLinus Torvalds * 161b9049df5SDmitri Vorobiev * NOTE! No point in using "atomic_long_set()": using a direct 162a08727baSLinus Torvalds * assignment of the work data initializer allows the compiler 163a08727baSLinus Torvalds * to generate better code. 1641da177e4SLinus Torvalds */ 1654e6045f1SJohannes Berg #ifdef CONFIG_LOCKDEP 166dc186ad7SThomas Gleixner #define __INIT_WORK(_work, _func, _onstack) \ 1674e6045f1SJohannes Berg do { \ 1684e6045f1SJohannes Berg static struct lock_class_key __key; \ 1694e6045f1SJohannes Berg \ 170dc186ad7SThomas Gleixner __init_work((_work), _onstack); \ 1714e6045f1SJohannes Berg (_work)->data = (atomic_long_t) WORK_DATA_INIT(); \ 1724e6045f1SJohannes Berg lockdep_init_map(&(_work)->lockdep_map, #_work, &__key, 0);\ 1734e6045f1SJohannes Berg INIT_LIST_HEAD(&(_work)->entry); \ 1744e6045f1SJohannes Berg PREPARE_WORK((_work), (_func)); \ 1754e6045f1SJohannes Berg } while (0) 1764e6045f1SJohannes Berg #else 177dc186ad7SThomas Gleixner #define __INIT_WORK(_work, _func, _onstack) \ 1781da177e4SLinus Torvalds do { \ 179dc186ad7SThomas Gleixner __init_work((_work), _onstack); \ 18023b2e599SOleg Nesterov (_work)->data = (atomic_long_t) WORK_DATA_INIT(); \ 18165f27f38SDavid Howells INIT_LIST_HEAD(&(_work)->entry); \ 18265f27f38SDavid Howells PREPARE_WORK((_work), (_func)); \ 18365f27f38SDavid Howells } while (0) 1844e6045f1SJohannes Berg #endif 18565f27f38SDavid Howells 186dc186ad7SThomas Gleixner #define INIT_WORK(_work, _func) \ 187dc186ad7SThomas Gleixner do { \ 188dc186ad7SThomas Gleixner __INIT_WORK((_work), (_func), 0); \ 189dc186ad7SThomas Gleixner } while (0) 190dc186ad7SThomas Gleixner 191dc186ad7SThomas Gleixner #define INIT_WORK_ON_STACK(_work, _func) \ 192dc186ad7SThomas Gleixner do { \ 193dc186ad7SThomas Gleixner __INIT_WORK((_work), (_func), 1); \ 194dc186ad7SThomas Gleixner } while (0) 195dc186ad7SThomas Gleixner 19665f27f38SDavid Howells #define INIT_DELAYED_WORK(_work, _func) \ 19765f27f38SDavid Howells do { \ 19865f27f38SDavid Howells INIT_WORK(&(_work)->work, (_func)); \ 19965f27f38SDavid Howells init_timer(&(_work)->timer); \ 20065f27f38SDavid Howells } while (0) 20165f27f38SDavid Howells 2026d612b0fSPeter Zijlstra #define INIT_DELAYED_WORK_ON_STACK(_work, _func) \ 2036d612b0fSPeter Zijlstra do { \ 204dc186ad7SThomas Gleixner INIT_WORK_ON_STACK(&(_work)->work, (_func)); \ 2056d612b0fSPeter Zijlstra init_timer_on_stack(&(_work)->timer); \ 2066d612b0fSPeter Zijlstra } while (0) 2076d612b0fSPeter Zijlstra 20828287033SVenki Pallipadi #define INIT_DELAYED_WORK_DEFERRABLE(_work, _func) \ 20928287033SVenki Pallipadi do { \ 21028287033SVenki Pallipadi INIT_WORK(&(_work)->work, (_func)); \ 21128287033SVenki Pallipadi init_timer_deferrable(&(_work)->timer); \ 21228287033SVenki Pallipadi } while (0) 21328287033SVenki Pallipadi 214365970a1SDavid Howells /** 215365970a1SDavid Howells * work_pending - Find out whether a work item is currently pending 216365970a1SDavid Howells * @work: The work item in question 217365970a1SDavid Howells */ 218365970a1SDavid Howells #define work_pending(work) \ 21922df02bbSTejun Heo test_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work)) 220365970a1SDavid Howells 221365970a1SDavid Howells /** 222365970a1SDavid Howells * delayed_work_pending - Find out whether a delayable work item is currently 223365970a1SDavid Howells * pending 224365970a1SDavid Howells * @work: The work item in question 225365970a1SDavid Howells */ 2260221872aSLinus Torvalds #define delayed_work_pending(w) \ 2270221872aSLinus Torvalds work_pending(&(w)->work) 228365970a1SDavid Howells 22965f27f38SDavid Howells /** 23023b2e599SOleg Nesterov * work_clear_pending - for internal use only, mark a work item as not pending 23123b2e599SOleg Nesterov * @work: The work item in question 23265f27f38SDavid Howells */ 23323b2e599SOleg Nesterov #define work_clear_pending(work) \ 23422df02bbSTejun Heo clear_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work)) 23565f27f38SDavid Howells 23697e37d7bSTejun Heo enum { 237bdbc5dd7STejun Heo WQ_NON_REENTRANT = 1 << 0, /* guarantee non-reentrance */ 238c7fc77f7STejun Heo WQ_UNBOUND = 1 << 1, /* not bound to any cpu */ 239bdbc5dd7STejun Heo WQ_FREEZEABLE = 1 << 2, /* freeze during suspend */ 240e22bee78STejun Heo WQ_RESCUER = 1 << 3, /* has an rescue worker */ 241649027d7STejun Heo WQ_HIGHPRI = 1 << 4, /* high priority */ 242fb0e7bebSTejun Heo WQ_CPU_INTENSIVE = 1 << 5, /* cpu instensive workqueue */ 243b71ab8c2STejun Heo 244e41e704bSTejun Heo WQ_DYING = 1 << 6, /* internal: workqueue is dying */ 245e41e704bSTejun Heo 246b71ab8c2STejun Heo WQ_MAX_ACTIVE = 512, /* I like 512, better ideas? */ 247f3421797STejun Heo WQ_MAX_UNBOUND_PER_CPU = 4, /* 4 * #cpus for unbound wq */ 248b71ab8c2STejun Heo WQ_DFL_ACTIVE = WQ_MAX_ACTIVE / 2, 24997e37d7bSTejun Heo }; 25052bad64dSDavid Howells 251f3421797STejun Heo /* unbound wq's aren't per-cpu, scale max_active according to #cpus */ 252f3421797STejun Heo #define WQ_UNBOUND_MAX_ACTIVE \ 253f3421797STejun Heo max_t(int, WQ_MAX_ACTIVE, num_possible_cpus() * WQ_MAX_UNBOUND_PER_CPU) 254f3421797STejun Heo 255d320c038STejun Heo /* 256d320c038STejun Heo * System-wide workqueues which are always present. 257d320c038STejun Heo * 258d320c038STejun Heo * system_wq is the one used by schedule[_delayed]_work[_on](). 259d320c038STejun Heo * Multi-CPU multi-threaded. There are users which expect relatively 260d320c038STejun Heo * short queue flush time. Don't queue works which can run for too 261d320c038STejun Heo * long. 262d320c038STejun Heo * 263d320c038STejun Heo * system_long_wq is similar to system_wq but may host long running 264d320c038STejun Heo * works. Queue flushing might take relatively long. 265d320c038STejun Heo * 266d320c038STejun Heo * system_nrt_wq is non-reentrant and guarantees that any given work 267d320c038STejun Heo * item is never executed in parallel by multiple CPUs. Queue 268d320c038STejun Heo * flushing might take relatively long. 269f3421797STejun Heo * 270f3421797STejun Heo * system_unbound_wq is unbound workqueue. Workers are not bound to 271f3421797STejun Heo * any specific CPU, not concurrency managed, and all queued works are 272f3421797STejun Heo * executed immediately as long as max_active limit is not reached and 273f3421797STejun Heo * resources are available. 274d320c038STejun Heo */ 275d320c038STejun Heo extern struct workqueue_struct *system_wq; 276d320c038STejun Heo extern struct workqueue_struct *system_long_wq; 277d320c038STejun Heo extern struct workqueue_struct *system_nrt_wq; 278f3421797STejun Heo extern struct workqueue_struct *system_unbound_wq; 2791da177e4SLinus Torvalds 2804e6045f1SJohannes Berg extern struct workqueue_struct * 281d320c038STejun Heo __alloc_workqueue_key(const char *name, unsigned int flags, int max_active, 282c790bce0STejun Heo struct lock_class_key *key, const char *lock_name); 2834e6045f1SJohannes Berg 2844e6045f1SJohannes Berg #ifdef CONFIG_LOCKDEP 285d320c038STejun Heo #define alloc_workqueue(name, flags, max_active) \ 2864e6045f1SJohannes Berg ({ \ 2874e6045f1SJohannes Berg static struct lock_class_key __key; \ 288eb13ba87SJohannes Berg const char *__lock_name; \ 289eb13ba87SJohannes Berg \ 290eb13ba87SJohannes Berg if (__builtin_constant_p(name)) \ 291eb13ba87SJohannes Berg __lock_name = (name); \ 292eb13ba87SJohannes Berg else \ 293eb13ba87SJohannes Berg __lock_name = #name; \ 2944e6045f1SJohannes Berg \ 295d320c038STejun Heo __alloc_workqueue_key((name), (flags), (max_active), \ 2961e19ffc6STejun Heo &__key, __lock_name); \ 2974e6045f1SJohannes Berg }) 2984e6045f1SJohannes Berg #else 299d320c038STejun Heo #define alloc_workqueue(name, flags, max_active) \ 300d320c038STejun Heo __alloc_workqueue_key((name), (flags), (max_active), NULL, NULL) 3014e6045f1SJohannes Berg #endif 3024e6045f1SJohannes Berg 30397e37d7bSTejun Heo #define create_workqueue(name) \ 304d320c038STejun Heo alloc_workqueue((name), WQ_RESCUER, 1) 30597e37d7bSTejun Heo #define create_freezeable_workqueue(name) \ 306c7fc77f7STejun Heo alloc_workqueue((name), WQ_FREEZEABLE | WQ_UNBOUND | WQ_RESCUER, 1) 30797e37d7bSTejun Heo #define create_singlethread_workqueue(name) \ 308c7fc77f7STejun Heo alloc_workqueue((name), WQ_UNBOUND | WQ_RESCUER, 1) 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvalds extern void destroy_workqueue(struct workqueue_struct *wq); 3111da177e4SLinus Torvalds 312b3c97528SHarvey Harrison extern int queue_work(struct workqueue_struct *wq, struct work_struct *work); 313c1a220e7SZhang Rui extern int queue_work_on(int cpu, struct workqueue_struct *wq, 314c1a220e7SZhang Rui struct work_struct *work); 315b3c97528SHarvey Harrison extern int queue_delayed_work(struct workqueue_struct *wq, 316b3c97528SHarvey Harrison struct delayed_work *work, unsigned long delay); 3177a6bc1cdSVenkatesh Pallipadi extern int queue_delayed_work_on(int cpu, struct workqueue_struct *wq, 31852bad64dSDavid Howells struct delayed_work *work, unsigned long delay); 31928e53bddSOleg Nesterov 320b3c97528SHarvey Harrison extern void flush_workqueue(struct workqueue_struct *wq); 32128e53bddSOleg Nesterov extern void flush_scheduled_work(void); 32243046b60SLinus Torvalds extern void flush_delayed_work(struct delayed_work *work); 3231da177e4SLinus Torvalds 324b3c97528SHarvey Harrison extern int schedule_work(struct work_struct *work); 325c1a220e7SZhang Rui extern int schedule_work_on(int cpu, struct work_struct *work); 326b3c97528SHarvey Harrison extern int schedule_delayed_work(struct delayed_work *work, unsigned long delay); 32728e53bddSOleg Nesterov extern int schedule_delayed_work_on(int cpu, struct delayed_work *work, 32828e53bddSOleg Nesterov unsigned long delay); 32965f27f38SDavid Howells extern int schedule_on_each_cpu(work_func_t func); 3301da177e4SLinus Torvalds extern int keventd_up(void); 3311da177e4SLinus Torvalds 33265f27f38SDavid Howells int execute_in_process_context(work_func_t fn, struct execute_work *); 3331da177e4SLinus Torvalds 334db700897SOleg Nesterov extern int flush_work(struct work_struct *work); 3351f1f642eSOleg Nesterov extern int cancel_work_sync(struct work_struct *work); 33628e53bddSOleg Nesterov 337dcd989cbSTejun Heo extern void workqueue_set_max_active(struct workqueue_struct *wq, 338dcd989cbSTejun Heo int max_active); 339dcd989cbSTejun Heo extern bool workqueue_congested(unsigned int cpu, struct workqueue_struct *wq); 340dcd989cbSTejun Heo extern unsigned int work_cpu(struct work_struct *work); 341dcd989cbSTejun Heo extern unsigned int work_busy(struct work_struct *work); 342dcd989cbSTejun Heo 3431da177e4SLinus Torvalds /* 3441da177e4SLinus Torvalds * Kill off a pending schedule_delayed_work(). Note that the work callback 345071b6386SOleg Nesterov * function may still be running on return from cancel_delayed_work(), unless 346071b6386SOleg Nesterov * it returns 1 and the work doesn't re-arm itself. Run flush_workqueue() or 34728e53bddSOleg Nesterov * cancel_work_sync() to wait on it. 3481da177e4SLinus Torvalds */ 34952bad64dSDavid Howells static inline int cancel_delayed_work(struct delayed_work *work) 3501da177e4SLinus Torvalds { 3511da177e4SLinus Torvalds int ret; 3521da177e4SLinus Torvalds 353223a10a9SOleg Nesterov ret = del_timer_sync(&work->timer); 3541da177e4SLinus Torvalds if (ret) 35523b2e599SOleg Nesterov work_clear_pending(&work->work); 3561da177e4SLinus Torvalds return ret; 3571da177e4SLinus Torvalds } 3581da177e4SLinus Torvalds 3594e49627bSOleg Nesterov /* 3604e49627bSOleg Nesterov * Like above, but uses del_timer() instead of del_timer_sync(). This means, 3614e49627bSOleg Nesterov * if it returns 0 the timer function may be running and the queueing is in 3624e49627bSOleg Nesterov * progress. 3634e49627bSOleg Nesterov */ 3644e49627bSOleg Nesterov static inline int __cancel_delayed_work(struct delayed_work *work) 3654e49627bSOleg Nesterov { 3664e49627bSOleg Nesterov int ret; 3674e49627bSOleg Nesterov 3684e49627bSOleg Nesterov ret = del_timer(&work->timer); 3694e49627bSOleg Nesterov if (ret) 3704e49627bSOleg Nesterov work_clear_pending(&work->work); 3714e49627bSOleg Nesterov return ret; 3724e49627bSOleg Nesterov } 3734e49627bSOleg Nesterov 3741f1f642eSOleg Nesterov extern int cancel_delayed_work_sync(struct delayed_work *work); 3751634c48fSOleg Nesterov 376f5a421a4SOleg Nesterov /* Obsolete. use cancel_delayed_work_sync() */ 3771634c48fSOleg Nesterov static inline 3781634c48fSOleg Nesterov void cancel_rearming_delayed_workqueue(struct workqueue_struct *wq, 3791634c48fSOleg Nesterov struct delayed_work *work) 3801634c48fSOleg Nesterov { 381f5a421a4SOleg Nesterov cancel_delayed_work_sync(work); 382f5a421a4SOleg Nesterov } 383f5a421a4SOleg Nesterov 384f5a421a4SOleg Nesterov /* Obsolete. use cancel_delayed_work_sync() */ 385f5a421a4SOleg Nesterov static inline 386f5a421a4SOleg Nesterov void cancel_rearming_delayed_work(struct delayed_work *work) 387f5a421a4SOleg Nesterov { 388f5a421a4SOleg Nesterov cancel_delayed_work_sync(work); 3891634c48fSOleg Nesterov } 3901634c48fSOleg Nesterov 3912d3854a3SRusty Russell #ifndef CONFIG_SMP 3922d3854a3SRusty Russell static inline long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg) 3932d3854a3SRusty Russell { 3942d3854a3SRusty Russell return fn(arg); 3952d3854a3SRusty Russell } 3962d3854a3SRusty Russell #else 3972d3854a3SRusty Russell long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg); 3982d3854a3SRusty Russell #endif /* CONFIG_SMP */ 399a25909a4SPaul E. McKenney 400a0a1a5fdSTejun Heo #ifdef CONFIG_FREEZER 401a0a1a5fdSTejun Heo extern void freeze_workqueues_begin(void); 402a0a1a5fdSTejun Heo extern bool freeze_workqueues_busy(void); 403a0a1a5fdSTejun Heo extern void thaw_workqueues(void); 404a0a1a5fdSTejun Heo #endif /* CONFIG_FREEZER */ 405a0a1a5fdSTejun Heo 406a25909a4SPaul E. McKenney #ifdef CONFIG_LOCKDEP 407a25909a4SPaul E. McKenney int in_workqueue_context(struct workqueue_struct *wq); 408a25909a4SPaul E. McKenney #endif 4093b7433b8SLinus Torvalds 4101da177e4SLinus Torvalds #endif 411