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

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Diff markup

Differences between /include/linux/workqueue.h (Version linux-3.15.10) and /include/linux/workqueue.h (Version linux-4.7.10)


  1 /*                                                  1 /*
  2  * workqueue.h --- work queue handling for Lin      2  * workqueue.h --- work queue handling for Linux.
  3  */                                                 3  */
  4                                                     4 
  5 #ifndef _LINUX_WORKQUEUE_H                          5 #ifndef _LINUX_WORKQUEUE_H
  6 #define _LINUX_WORKQUEUE_H                          6 #define _LINUX_WORKQUEUE_H
  7                                                     7 
  8 #include <linux/timer.h>                            8 #include <linux/timer.h>
  9 #include <linux/linkage.h>                          9 #include <linux/linkage.h>
 10 #include <linux/bitops.h>                          10 #include <linux/bitops.h>
 11 #include <linux/lockdep.h>                         11 #include <linux/lockdep.h>
 12 #include <linux/threads.h>                         12 #include <linux/threads.h>
 13 #include <linux/atomic.h>                          13 #include <linux/atomic.h>
 14 #include <linux/cpumask.h>                         14 #include <linux/cpumask.h>
 15                                                    15 
 16 struct workqueue_struct;                           16 struct workqueue_struct;
 17                                                    17 
 18 struct work_struct;                                18 struct work_struct;
 19 typedef void (*work_func_t)(struct work_struct     19 typedef void (*work_func_t)(struct work_struct *work);
 20 void delayed_work_timer_fn(unsigned long __dat     20 void delayed_work_timer_fn(unsigned long __data);
 21                                                    21 
 22 /*                                                 22 /*
 23  * The first word is the work queue pointer an     23  * The first word is the work queue pointer and the flags rolled into
 24  * one                                             24  * one
 25  */                                                25  */
 26 #define work_data_bits(work) ((unsigned long *     26 #define work_data_bits(work) ((unsigned long *)(&(work)->data))
 27                                                    27 
 28 enum {                                             28 enum {
 29         WORK_STRUCT_PENDING_BIT = 0,    /* wor     29         WORK_STRUCT_PENDING_BIT = 0,    /* work item is pending execution */
 30         WORK_STRUCT_DELAYED_BIT = 1,    /* wor     30         WORK_STRUCT_DELAYED_BIT = 1,    /* work item is delayed */
 31         WORK_STRUCT_PWQ_BIT     = 2,    /* dat     31         WORK_STRUCT_PWQ_BIT     = 2,    /* data points to pwq */
 32         WORK_STRUCT_LINKED_BIT  = 3,    /* nex     32         WORK_STRUCT_LINKED_BIT  = 3,    /* next work is linked to this one */
 33 #ifdef CONFIG_DEBUG_OBJECTS_WORK                   33 #ifdef CONFIG_DEBUG_OBJECTS_WORK
 34         WORK_STRUCT_STATIC_BIT  = 4,    /* sta     34         WORK_STRUCT_STATIC_BIT  = 4,    /* static initializer (debugobjects) */
 35         WORK_STRUCT_COLOR_SHIFT = 5,    /* col     35         WORK_STRUCT_COLOR_SHIFT = 5,    /* color for workqueue flushing */
 36 #else                                              36 #else
 37         WORK_STRUCT_COLOR_SHIFT = 4,    /* col     37         WORK_STRUCT_COLOR_SHIFT = 4,    /* color for workqueue flushing */
 38 #endif                                             38 #endif
 39                                                    39 
 40         WORK_STRUCT_COLOR_BITS  = 4,               40         WORK_STRUCT_COLOR_BITS  = 4,
 41                                                    41 
 42         WORK_STRUCT_PENDING     = 1 << WORK_ST     42         WORK_STRUCT_PENDING     = 1 << WORK_STRUCT_PENDING_BIT,
 43         WORK_STRUCT_DELAYED     = 1 << WORK_ST     43         WORK_STRUCT_DELAYED     = 1 << WORK_STRUCT_DELAYED_BIT,
 44         WORK_STRUCT_PWQ         = 1 << WORK_ST     44         WORK_STRUCT_PWQ         = 1 << WORK_STRUCT_PWQ_BIT,
 45         WORK_STRUCT_LINKED      = 1 << WORK_ST     45         WORK_STRUCT_LINKED      = 1 << WORK_STRUCT_LINKED_BIT,
 46 #ifdef CONFIG_DEBUG_OBJECTS_WORK                   46 #ifdef CONFIG_DEBUG_OBJECTS_WORK
 47         WORK_STRUCT_STATIC      = 1 << WORK_ST     47         WORK_STRUCT_STATIC      = 1 << WORK_STRUCT_STATIC_BIT,
 48 #else                                              48 #else
 49         WORK_STRUCT_STATIC      = 0,               49         WORK_STRUCT_STATIC      = 0,
 50 #endif                                             50 #endif
 51                                                    51 
 52         /*                                         52         /*
 53          * The last color is no color used for     53          * The last color is no color used for works which don't
 54          * participate in workqueue flushing.      54          * participate in workqueue flushing.
 55          */                                        55          */
 56         WORK_NR_COLORS          = (1 << WORK_S     56         WORK_NR_COLORS          = (1 << WORK_STRUCT_COLOR_BITS) - 1,
 57         WORK_NO_COLOR           = WORK_NR_COLO     57         WORK_NO_COLOR           = WORK_NR_COLORS,
 58                                                    58 
 59         /* special cpu IDs */                  !!  59         /* not bound to any CPU, prefer the local CPU */
 60         WORK_CPU_UNBOUND        = NR_CPUS,         60         WORK_CPU_UNBOUND        = NR_CPUS,
 61         WORK_CPU_END            = NR_CPUS + 1, << 
 62                                                    61 
 63         /*                                         62         /*
 64          * Reserve 7 bits off of pwq pointer w     63          * Reserve 7 bits off of pwq pointer w/ debugobjects turned off.
 65          * This makes pwqs aligned to 256 byte     64          * This makes pwqs aligned to 256 bytes and allows 15 workqueue
 66          * flush colors.                           65          * flush colors.
 67          */                                        66          */
 68         WORK_STRUCT_FLAG_BITS   = WORK_STRUCT_     67         WORK_STRUCT_FLAG_BITS   = WORK_STRUCT_COLOR_SHIFT +
 69                                   WORK_STRUCT_     68                                   WORK_STRUCT_COLOR_BITS,
 70                                                    69 
 71         /* data contains off-queue information     70         /* data contains off-queue information when !WORK_STRUCT_PWQ */
 72         WORK_OFFQ_FLAG_BASE     = WORK_STRUCT_     71         WORK_OFFQ_FLAG_BASE     = WORK_STRUCT_COLOR_SHIFT,
 73                                                    72 
 74         WORK_OFFQ_CANCELING     = (1 << WORK_O !!  73         __WORK_OFFQ_CANCELING   = WORK_OFFQ_FLAG_BASE,
                                                   >>  74         WORK_OFFQ_CANCELING     = (1 << __WORK_OFFQ_CANCELING),
 75                                                    75 
 76         /*                                         76         /*
 77          * When a work item is off queue, its      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     78          * pool it was on.  Cap at 31 bits and use the highest number to
 79          * indicate that no pool is associated     79          * indicate that no pool is associated.
 80          */                                        80          */
 81         WORK_OFFQ_FLAG_BITS     = 1,               81         WORK_OFFQ_FLAG_BITS     = 1,
 82         WORK_OFFQ_POOL_SHIFT    = WORK_OFFQ_FL     82         WORK_OFFQ_POOL_SHIFT    = WORK_OFFQ_FLAG_BASE + WORK_OFFQ_FLAG_BITS,
 83         WORK_OFFQ_LEFT          = BITS_PER_LON     83         WORK_OFFQ_LEFT          = BITS_PER_LONG - WORK_OFFQ_POOL_SHIFT,
 84         WORK_OFFQ_POOL_BITS     = WORK_OFFQ_LE     84         WORK_OFFQ_POOL_BITS     = WORK_OFFQ_LEFT <= 31 ? WORK_OFFQ_LEFT : 31,
 85         WORK_OFFQ_POOL_NONE     = (1LU << WORK     85         WORK_OFFQ_POOL_NONE     = (1LU << WORK_OFFQ_POOL_BITS) - 1,
 86                                                    86 
 87         /* convenience constants */                87         /* convenience constants */
 88         WORK_STRUCT_FLAG_MASK   = (1UL << WORK     88         WORK_STRUCT_FLAG_MASK   = (1UL << WORK_STRUCT_FLAG_BITS) - 1,
 89         WORK_STRUCT_WQ_DATA_MASK = ~WORK_STRUC     89         WORK_STRUCT_WQ_DATA_MASK = ~WORK_STRUCT_FLAG_MASK,
 90         WORK_STRUCT_NO_POOL     = (unsigned lo     90         WORK_STRUCT_NO_POOL     = (unsigned long)WORK_OFFQ_POOL_NONE << WORK_OFFQ_POOL_SHIFT,
 91                                                    91 
 92         /* bit mask for work_busy() return val     92         /* bit mask for work_busy() return values */
 93         WORK_BUSY_PENDING       = 1 << 0,          93         WORK_BUSY_PENDING       = 1 << 0,
 94         WORK_BUSY_RUNNING       = 1 << 1,          94         WORK_BUSY_RUNNING       = 1 << 1,
 95                                                    95 
 96         /* maximum string length for set_worke     96         /* maximum string length for set_worker_desc() */
 97         WORKER_DESC_LEN         = 24,              97         WORKER_DESC_LEN         = 24,
 98 };                                                 98 };
 99                                                    99 
100 struct work_struct {                              100 struct work_struct {
101         atomic_long_t data;                       101         atomic_long_t data;
102         struct list_head entry;                   102         struct list_head entry;
103         work_func_t func;                         103         work_func_t func;
104 #ifdef CONFIG_LOCKDEP                             104 #ifdef CONFIG_LOCKDEP
105         struct lockdep_map lockdep_map;           105         struct lockdep_map lockdep_map;
106 #endif                                            106 #endif
107 };                                                107 };
108                                                   108 
109 #define WORK_DATA_INIT()        ATOMIC_LONG_IN    109 #define WORK_DATA_INIT()        ATOMIC_LONG_INIT(WORK_STRUCT_NO_POOL)
110 #define WORK_DATA_STATIC_INIT() \                 110 #define WORK_DATA_STATIC_INIT() \
111         ATOMIC_LONG_INIT(WORK_STRUCT_NO_POOL |    111         ATOMIC_LONG_INIT(WORK_STRUCT_NO_POOL | WORK_STRUCT_STATIC)
112                                                   112 
113 struct delayed_work {                             113 struct delayed_work {
114         struct work_struct work;                  114         struct work_struct work;
115         struct timer_list timer;                  115         struct timer_list timer;
116                                                   116 
117         /* target workqueue and CPU ->timer us    117         /* target workqueue and CPU ->timer uses to queue ->work */
118         struct workqueue_struct *wq;              118         struct workqueue_struct *wq;
119         int cpu;                                  119         int cpu;
120 };                                                120 };
121                                                   121 
122 /*                                                122 /*
123  * A struct for workqueue attributes.  This ca    123  * A struct for workqueue attributes.  This can be used to change
124  * attributes of an unbound workqueue.            124  * attributes of an unbound workqueue.
125  *                                                125  *
126  * Unlike other fields, ->no_numa isn't a prop    126  * Unlike other fields, ->no_numa isn't a property of a worker_pool.  It
127  * only modifies how apply_workqueue_attrs() s    127  * only modifies how apply_workqueue_attrs() select pools and thus doesn't
128  * participate in pool hash calculations or eq    128  * participate in pool hash calculations or equality comparisons.
129  */                                               129  */
130 struct workqueue_attrs {                          130 struct workqueue_attrs {
131         int                     nice;             131         int                     nice;           /* nice level */
132         cpumask_var_t           cpumask;          132         cpumask_var_t           cpumask;        /* allowed CPUs */
133         bool                    no_numa;          133         bool                    no_numa;        /* disable NUMA affinity */
134 };                                                134 };
135                                                   135 
136 static inline struct delayed_work *to_delayed_    136 static inline struct delayed_work *to_delayed_work(struct work_struct *work)
137 {                                                 137 {
138         return container_of(work, struct delay    138         return container_of(work, struct delayed_work, work);
139 }                                                 139 }
140                                                   140 
141 struct execute_work {                             141 struct execute_work {
142         struct work_struct work;                  142         struct work_struct work;
143 };                                                143 };
144                                                   144 
145 #ifdef CONFIG_LOCKDEP                             145 #ifdef CONFIG_LOCKDEP
146 /*                                                146 /*
147  * NB: because we have to copy the lockdep_map    147  * NB: because we have to copy the lockdep_map, setting _key
148  * here is required, otherwise it could get in    148  * here is required, otherwise it could get initialised to the
149  * copy of the lockdep_map!                       149  * copy of the lockdep_map!
150  */                                               150  */
151 #define __WORK_INIT_LOCKDEP_MAP(n, k) \           151 #define __WORK_INIT_LOCKDEP_MAP(n, k) \
152         .lockdep_map = STATIC_LOCKDEP_MAP_INIT    152         .lockdep_map = STATIC_LOCKDEP_MAP_INIT(n, k),
153 #else                                             153 #else
154 #define __WORK_INIT_LOCKDEP_MAP(n, k)             154 #define __WORK_INIT_LOCKDEP_MAP(n, k)
155 #endif                                            155 #endif
156                                                   156 
157 #define __WORK_INITIALIZER(n, f) {                157 #define __WORK_INITIALIZER(n, f) {                                      \
158         .data = WORK_DATA_STATIC_INIT(),          158         .data = WORK_DATA_STATIC_INIT(),                                \
159         .entry  = { &(n).entry, &(n).entry },     159         .entry  = { &(n).entry, &(n).entry },                           \
160         .func = (f),                              160         .func = (f),                                                    \
161         __WORK_INIT_LOCKDEP_MAP(#n, &(n))         161         __WORK_INIT_LOCKDEP_MAP(#n, &(n))                               \
162         }                                         162         }
163                                                   163 
164 #define __DELAYED_WORK_INITIALIZER(n, f, tflag    164 #define __DELAYED_WORK_INITIALIZER(n, f, tflags) {                      \
165         .work = __WORK_INITIALIZER((n).work, (    165         .work = __WORK_INITIALIZER((n).work, (f)),                      \
166         .timer = __TIMER_INITIALIZER(delayed_w    166         .timer = __TIMER_INITIALIZER(delayed_work_timer_fn,             \
167                                      0, (unsig    167                                      0, (unsigned long)&(n),            \
168                                      (tflags)     168                                      (tflags) | TIMER_IRQSAFE),         \
169         }                                         169         }
170                                                   170 
171 #define DECLARE_WORK(n, f)                        171 #define DECLARE_WORK(n, f)                                              \
172         struct work_struct n = __WORK_INITIALI    172         struct work_struct n = __WORK_INITIALIZER(n, f)
173                                                   173 
174 #define DECLARE_DELAYED_WORK(n, f)                174 #define DECLARE_DELAYED_WORK(n, f)                                      \
175         struct delayed_work n = __DELAYED_WORK    175         struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f, 0)
176                                                   176 
177 #define DECLARE_DEFERRABLE_WORK(n, f)             177 #define DECLARE_DEFERRABLE_WORK(n, f)                                   \
178         struct delayed_work n = __DELAYED_WORK    178         struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f, TIMER_DEFERRABLE)
179                                                   179 
180 #ifdef CONFIG_DEBUG_OBJECTS_WORK                  180 #ifdef CONFIG_DEBUG_OBJECTS_WORK
181 extern void __init_work(struct work_struct *wo    181 extern void __init_work(struct work_struct *work, int onstack);
182 extern void destroy_work_on_stack(struct work_    182 extern void destroy_work_on_stack(struct work_struct *work);
183 extern void destroy_delayed_work_on_stack(stru    183 extern void destroy_delayed_work_on_stack(struct delayed_work *work);
184 static inline unsigned int work_static(struct     184 static inline unsigned int work_static(struct work_struct *work)
185 {                                                 185 {
186         return *work_data_bits(work) & WORK_ST    186         return *work_data_bits(work) & WORK_STRUCT_STATIC;
187 }                                                 187 }
188 #else                                             188 #else
189 static inline void __init_work(struct work_str    189 static inline void __init_work(struct work_struct *work, int onstack) { }
190 static inline void destroy_work_on_stack(struc    190 static inline void destroy_work_on_stack(struct work_struct *work) { }
191 static inline void destroy_delayed_work_on_sta    191 static inline void destroy_delayed_work_on_stack(struct delayed_work *work) { }
192 static inline unsigned int work_static(struct     192 static inline unsigned int work_static(struct work_struct *work) { return 0; }
193 #endif                                            193 #endif
194                                                   194 
195 /*                                                195 /*
196  * initialize all of a work item in one go        196  * initialize all of a work item in one go
197  *                                                197  *
198  * NOTE! No point in using "atomic_long_set()"    198  * NOTE! No point in using "atomic_long_set()": using a direct
199  * assignment of the work data initializer all    199  * assignment of the work data initializer allows the compiler
200  * to generate better code.                       200  * to generate better code.
201  */                                               201  */
202 #ifdef CONFIG_LOCKDEP                             202 #ifdef CONFIG_LOCKDEP
203 #define __INIT_WORK(_work, _func, _onstack)       203 #define __INIT_WORK(_work, _func, _onstack)                             \
204         do {                                      204         do {                                                            \
205                 static struct lock_class_key _    205                 static struct lock_class_key __key;                     \
206                                                   206                                                                         \
207                 __init_work((_work), _onstack)    207                 __init_work((_work), _onstack);                         \
208                 (_work)->data = (atomic_long_t    208                 (_work)->data = (atomic_long_t) WORK_DATA_INIT();       \
209                 lockdep_init_map(&(_work)->loc    209                 lockdep_init_map(&(_work)->lockdep_map, #_work, &__key, 0); \
210                 INIT_LIST_HEAD(&(_work)->entry    210                 INIT_LIST_HEAD(&(_work)->entry);                        \
211                 (_work)->func = (_func);          211                 (_work)->func = (_func);                                \
212         } while (0)                               212         } while (0)
213 #else                                             213 #else
214 #define __INIT_WORK(_work, _func, _onstack)       214 #define __INIT_WORK(_work, _func, _onstack)                             \
215         do {                                      215         do {                                                            \
216                 __init_work((_work), _onstack)    216                 __init_work((_work), _onstack);                         \
217                 (_work)->data = (atomic_long_t    217                 (_work)->data = (atomic_long_t) WORK_DATA_INIT();       \
218                 INIT_LIST_HEAD(&(_work)->entry    218                 INIT_LIST_HEAD(&(_work)->entry);                        \
219                 (_work)->func = (_func);          219                 (_work)->func = (_func);                                \
220         } while (0)                               220         } while (0)
221 #endif                                            221 #endif
222                                                   222 
223 #define INIT_WORK(_work, _func)                   223 #define INIT_WORK(_work, _func)                                         \
224         do {                                   !! 224         __INIT_WORK((_work), (_func), 0)
225                 __INIT_WORK((_work), (_func),  << 
226         } while (0)                            << 
227                                                   225 
228 #define INIT_WORK_ONSTACK(_work, _func)           226 #define INIT_WORK_ONSTACK(_work, _func)                                 \
229         do {                                   !! 227         __INIT_WORK((_work), (_func), 1)
230                 __INIT_WORK((_work), (_func),  << 
231         } while (0)                            << 
232                                                   228 
233 #define __INIT_DELAYED_WORK(_work, _func, _tfl    229 #define __INIT_DELAYED_WORK(_work, _func, _tflags)                      \
234         do {                                      230         do {                                                            \
235                 INIT_WORK(&(_work)->work, (_fu    231                 INIT_WORK(&(_work)->work, (_func));                     \
236                 __setup_timer(&(_work)->timer,    232                 __setup_timer(&(_work)->timer, delayed_work_timer_fn,   \
237                               (unsigned long)(    233                               (unsigned long)(_work),                   \
238                               (_tflags) | TIME    234                               (_tflags) | TIMER_IRQSAFE);               \
239         } while (0)                               235         } while (0)
240                                                   236 
241 #define __INIT_DELAYED_WORK_ONSTACK(_work, _fu    237 #define __INIT_DELAYED_WORK_ONSTACK(_work, _func, _tflags)              \
242         do {                                      238         do {                                                            \
243                 INIT_WORK_ONSTACK(&(_work)->wo    239                 INIT_WORK_ONSTACK(&(_work)->work, (_func));             \
244                 __setup_timer_on_stack(&(_work    240                 __setup_timer_on_stack(&(_work)->timer,                 \
245                                        delayed    241                                        delayed_work_timer_fn,           \
246                                        (unsign    242                                        (unsigned long)(_work),          \
247                                        (_tflag    243                                        (_tflags) | TIMER_IRQSAFE);      \
248         } while (0)                               244         } while (0)
249                                                   245 
250 #define INIT_DELAYED_WORK(_work, _func)           246 #define INIT_DELAYED_WORK(_work, _func)                                 \
251         __INIT_DELAYED_WORK(_work, _func, 0)      247         __INIT_DELAYED_WORK(_work, _func, 0)
252                                                   248 
253 #define INIT_DELAYED_WORK_ONSTACK(_work, _func    249 #define INIT_DELAYED_WORK_ONSTACK(_work, _func)                         \
254         __INIT_DELAYED_WORK_ONSTACK(_work, _fu    250         __INIT_DELAYED_WORK_ONSTACK(_work, _func, 0)
255                                                   251 
256 #define INIT_DEFERRABLE_WORK(_work, _func)        252 #define INIT_DEFERRABLE_WORK(_work, _func)                              \
257         __INIT_DELAYED_WORK(_work, _func, TIME    253         __INIT_DELAYED_WORK(_work, _func, TIMER_DEFERRABLE)
258                                                   254 
259 #define INIT_DEFERRABLE_WORK_ONSTACK(_work, _f    255 #define INIT_DEFERRABLE_WORK_ONSTACK(_work, _func)                      \
260         __INIT_DELAYED_WORK_ONSTACK(_work, _fu    256         __INIT_DELAYED_WORK_ONSTACK(_work, _func, TIMER_DEFERRABLE)
261                                                   257 
262 /**                                               258 /**
263  * work_pending - Find out whether a work item    259  * work_pending - Find out whether a work item is currently pending
264  * @work: The work item in question               260  * @work: The work item in question
265  */                                               261  */
266 #define work_pending(work) \                      262 #define work_pending(work) \
267         test_bit(WORK_STRUCT_PENDING_BIT, work    263         test_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))
268                                                   264 
269 /**                                               265 /**
270  * delayed_work_pending - Find out whether a d    266  * delayed_work_pending - Find out whether a delayable work item is currently
271  * pending                                        267  * pending
272  * @work: The work item in question            !! 268  * @w: The work item in question
273  */                                               269  */
274 #define delayed_work_pending(w) \                 270 #define delayed_work_pending(w) \
275         work_pending(&(w)->work)                  271         work_pending(&(w)->work)
276                                                   272 
277 /**                                            << 
278  * work_clear_pending - for internal use only, << 
279  * @work: The work item in question            << 
280  */                                            << 
281 #define work_clear_pending(work) \             << 
282         clear_bit(WORK_STRUCT_PENDING_BIT, wor << 
283                                                << 
284 /*                                                273 /*
285  * Workqueue flags and constants.  For details    274  * Workqueue flags and constants.  For details, please refer to
286  * Documentation/workqueue.txt.                   275  * Documentation/workqueue.txt.
287  */                                               276  */
288 enum {                                            277 enum {
289         WQ_UNBOUND              = 1 << 1, /* n    278         WQ_UNBOUND              = 1 << 1, /* not bound to any cpu */
290         WQ_FREEZABLE            = 1 << 2, /* f    279         WQ_FREEZABLE            = 1 << 2, /* freeze during suspend */
291         WQ_MEM_RECLAIM          = 1 << 3, /* m    280         WQ_MEM_RECLAIM          = 1 << 3, /* may be used for memory reclaim */
292         WQ_HIGHPRI              = 1 << 4, /* h    281         WQ_HIGHPRI              = 1 << 4, /* high priority */
293         WQ_CPU_INTENSIVE        = 1 << 5, /* c    282         WQ_CPU_INTENSIVE        = 1 << 5, /* cpu intensive workqueue */
294         WQ_SYSFS                = 1 << 6, /* v    283         WQ_SYSFS                = 1 << 6, /* visible in sysfs, see wq_sysfs_register() */
295                                                   284 
296         /*                                        285         /*
297          * Per-cpu workqueues are generally pr    286          * Per-cpu workqueues are generally preferred because they tend to
298          * show better performance thanks to c    287          * show better performance thanks to cache locality.  Per-cpu
299          * workqueues exclude the scheduler fr    288          * workqueues exclude the scheduler from choosing the CPU to
300          * execute the worker threads, which h    289          * execute the worker threads, which has an unfortunate side effect
301          * of increasing power consumption.       290          * of increasing power consumption.
302          *                                        291          *
303          * The scheduler considers a CPU idle     292          * The scheduler considers a CPU idle if it doesn't have any task
304          * to execute and tries to keep idle c    293          * to execute and tries to keep idle cores idle to conserve power;
305          * however, for example, a per-cpu wor    294          * however, for example, a per-cpu work item scheduled from an
306          * interrupt handler on an idle CPU wi    295          * interrupt handler on an idle CPU will force the scheduler to
307          * excute the work item on that CPU br    296          * excute the work item on that CPU breaking the idleness, which in
308          * turn may lead to more scheduling ch    297          * turn may lead to more scheduling choices which are sub-optimal
309          * in terms of power consumption.         298          * in terms of power consumption.
310          *                                        299          *
311          * Workqueues marked with WQ_POWER_EFF    300          * Workqueues marked with WQ_POWER_EFFICIENT are per-cpu by default
312          * but become unbound if workqueue.pow    301          * but become unbound if workqueue.power_efficient kernel param is
313          * specified.  Per-cpu workqueues whic    302          * specified.  Per-cpu workqueues which are identified to
314          * contribute significantly to power-c    303          * contribute significantly to power-consumption are identified and
315          * marked with this flag and enabling     304          * marked with this flag and enabling the power_efficient mode
316          * leads to noticeable power saving at    305          * leads to noticeable power saving at the cost of small
317          * performance disadvantage.              306          * performance disadvantage.
318          *                                        307          *
319          * http://thread.gmane.org/gmane.linux    308          * http://thread.gmane.org/gmane.linux.kernel/1480396
320          */                                       309          */
321         WQ_POWER_EFFICIENT      = 1 << 7,         310         WQ_POWER_EFFICIENT      = 1 << 7,
322                                                   311 
323         __WQ_DRAINING           = 1 << 16, /*     312         __WQ_DRAINING           = 1 << 16, /* internal: workqueue is draining */
324         __WQ_ORDERED            = 1 << 17, /*     313         __WQ_ORDERED            = 1 << 17, /* internal: workqueue is ordered */
                                                   >> 314         __WQ_LEGACY             = 1 << 18, /* internal: create*_workqueue() */
325                                                   315 
326         WQ_MAX_ACTIVE           = 512,    /* I    316         WQ_MAX_ACTIVE           = 512,    /* I like 512, better ideas? */
327         WQ_MAX_UNBOUND_PER_CPU  = 4,      /* 4    317         WQ_MAX_UNBOUND_PER_CPU  = 4,      /* 4 * #cpus for unbound wq */
328         WQ_DFL_ACTIVE           = WQ_MAX_ACTIV    318         WQ_DFL_ACTIVE           = WQ_MAX_ACTIVE / 2,
329 };                                                319 };
330                                                   320 
331 /* unbound wq's aren't per-cpu, scale max_acti    321 /* unbound wq's aren't per-cpu, scale max_active according to #cpus */
332 #define WQ_UNBOUND_MAX_ACTIVE   \                 322 #define WQ_UNBOUND_MAX_ACTIVE   \
333         max_t(int, WQ_MAX_ACTIVE, num_possible    323         max_t(int, WQ_MAX_ACTIVE, num_possible_cpus() * WQ_MAX_UNBOUND_PER_CPU)
334                                                   324 
335 /*                                                325 /*
336  * System-wide workqueues which are always pre    326  * System-wide workqueues which are always present.
337  *                                                327  *
338  * system_wq is the one used by schedule[_dela    328  * system_wq is the one used by schedule[_delayed]_work[_on]().
339  * Multi-CPU multi-threaded.  There are users     329  * Multi-CPU multi-threaded.  There are users which expect relatively
340  * short queue flush time.  Don't queue works     330  * short queue flush time.  Don't queue works which can run for too
341  * long.                                          331  * long.
342  *                                                332  *
                                                   >> 333  * system_highpri_wq is similar to system_wq but for work items which
                                                   >> 334  * require WQ_HIGHPRI.
                                                   >> 335  *
343  * system_long_wq is similar to system_wq but     336  * system_long_wq is similar to system_wq but may host long running
344  * works.  Queue flushing might take relativel    337  * works.  Queue flushing might take relatively long.
345  *                                                338  *
346  * system_unbound_wq is unbound workqueue.  Wo    339  * system_unbound_wq is unbound workqueue.  Workers are not bound to
347  * any specific CPU, not concurrency managed,     340  * any specific CPU, not concurrency managed, and all queued works are
348  * executed immediately as long as max_active     341  * executed immediately as long as max_active limit is not reached and
349  * resources are available.                       342  * resources are available.
350  *                                                343  *
351  * system_freezable_wq is equivalent to system    344  * system_freezable_wq is equivalent to system_wq except that it's
352  * freezable.                                     345  * freezable.
353  *                                                346  *
354  * *_power_efficient_wq are inclined towards s    347  * *_power_efficient_wq are inclined towards saving power and converted
355  * into WQ_UNBOUND variants if 'wq_power_effic    348  * into WQ_UNBOUND variants if 'wq_power_efficient' is enabled; otherwise,
356  * they are same as their non-power-efficient     349  * they are same as their non-power-efficient counterparts - e.g.
357  * system_power_efficient_wq is identical to s    350  * system_power_efficient_wq is identical to system_wq if
358  * 'wq_power_efficient' is disabled.  See WQ_P    351  * 'wq_power_efficient' is disabled.  See WQ_POWER_EFFICIENT for more info.
359  */                                               352  */
360 extern struct workqueue_struct *system_wq;        353 extern struct workqueue_struct *system_wq;
                                                   >> 354 extern struct workqueue_struct *system_highpri_wq;
361 extern struct workqueue_struct *system_long_wq    355 extern struct workqueue_struct *system_long_wq;
362 extern struct workqueue_struct *system_unbound    356 extern struct workqueue_struct *system_unbound_wq;
363 extern struct workqueue_struct *system_freezab    357 extern struct workqueue_struct *system_freezable_wq;
364 extern struct workqueue_struct *system_power_e    358 extern struct workqueue_struct *system_power_efficient_wq;
365 extern struct workqueue_struct *system_freezab    359 extern struct workqueue_struct *system_freezable_power_efficient_wq;
366                                                   360 
367 static inline struct workqueue_struct * __depr << 
368 {                                              << 
369         return system_wq;                      << 
370 }                                              << 
371                                                << 
372 static inline struct workqueue_struct * __depr << 
373 {                                              << 
374         return system_freezable_wq;            << 
375 }                                              << 
376                                                << 
377 /* equivlalent to system_wq and system_freezab << 
378 #define system_nrt_wq                   __syst << 
379 #define system_nrt_freezable_wq         __syst << 
380                                                << 
381 extern struct workqueue_struct *                  361 extern struct workqueue_struct *
382 __alloc_workqueue_key(const char *fmt, unsigne    362 __alloc_workqueue_key(const char *fmt, unsigned int flags, int max_active,
383         struct lock_class_key *key, const char    363         struct lock_class_key *key, const char *lock_name, ...) __printf(1, 6);
384                                                   364 
385 /**                                               365 /**
386  * alloc_workqueue - allocate a workqueue         366  * alloc_workqueue - allocate a workqueue
387  * @fmt: printf format for the name of the wor    367  * @fmt: printf format for the name of the workqueue
388  * @flags: WQ_* flags                             368  * @flags: WQ_* flags
389  * @max_active: max in-flight work items, 0 fo    369  * @max_active: max in-flight work items, 0 for default
390  * @args: args for @fmt                        !! 370  * @args...: args for @fmt
391  *                                                371  *
392  * Allocate a workqueue with the specified par    372  * Allocate a workqueue with the specified parameters.  For detailed
393  * information on WQ_* flags, please refer to     373  * information on WQ_* flags, please refer to Documentation/workqueue.txt.
394  *                                                374  *
395  * The __lock_name macro dance is to guarantee    375  * The __lock_name macro dance is to guarantee that single lock_class_key
396  * doesn't end up with different namesm, which    376  * doesn't end up with different namesm, which isn't allowed by lockdep.
397  *                                                377  *
398  * RETURNS:                                       378  * RETURNS:
399  * Pointer to the allocated workqueue on succe    379  * Pointer to the allocated workqueue on success, %NULL on failure.
400  */                                               380  */
401 #ifdef CONFIG_LOCKDEP                             381 #ifdef CONFIG_LOCKDEP
402 #define alloc_workqueue(fmt, flags, max_active    382 #define alloc_workqueue(fmt, flags, max_active, args...)                \
403 ({                                                383 ({                                                                      \
404         static struct lock_class_key __key;       384         static struct lock_class_key __key;                             \
405         const char *__lock_name;                  385         const char *__lock_name;                                        \
406                                                   386                                                                         \
407         __lock_name = #fmt#args;                  387         __lock_name = #fmt#args;                                        \
408                                                   388                                                                         \
409         __alloc_workqueue_key((fmt), (flags),     389         __alloc_workqueue_key((fmt), (flags), (max_active),             \
410                               &__key, __lock_n    390                               &__key, __lock_name, ##args);             \
411 })                                                391 })
412 #else                                             392 #else
413 #define alloc_workqueue(fmt, flags, max_active    393 #define alloc_workqueue(fmt, flags, max_active, args...)                \
414         __alloc_workqueue_key((fmt), (flags),     394         __alloc_workqueue_key((fmt), (flags), (max_active),             \
415                               NULL, NULL, ##ar    395                               NULL, NULL, ##args)
416 #endif                                            396 #endif
417                                                   397 
418 /**                                               398 /**
419  * alloc_ordered_workqueue - allocate an order    399  * alloc_ordered_workqueue - allocate an ordered workqueue
420  * @fmt: printf format for the name of the wor    400  * @fmt: printf format for the name of the workqueue
421  * @flags: WQ_* flags (only WQ_FREEZABLE and W    401  * @flags: WQ_* flags (only WQ_FREEZABLE and WQ_MEM_RECLAIM are meaningful)
422  * @args: args for @fmt                        !! 402  * @args...: args for @fmt
423  *                                                403  *
424  * Allocate an ordered workqueue.  An ordered     404  * Allocate an ordered workqueue.  An ordered workqueue executes at
425  * most one work item at any given time in the    405  * most one work item at any given time in the queued order.  They are
426  * implemented as unbound workqueues with @max    406  * implemented as unbound workqueues with @max_active of one.
427  *                                                407  *
428  * RETURNS:                                       408  * RETURNS:
429  * Pointer to the allocated workqueue on succe    409  * Pointer to the allocated workqueue on success, %NULL on failure.
430  */                                               410  */
431 #define alloc_ordered_workqueue(fmt, flags, ar    411 #define alloc_ordered_workqueue(fmt, flags, args...)                    \
432         alloc_workqueue(fmt, WQ_UNBOUND | __WQ    412         alloc_workqueue(fmt, WQ_UNBOUND | __WQ_ORDERED | (flags), 1, ##args)
433                                                   413 
434 #define create_workqueue(name)                    414 #define create_workqueue(name)                                          \
435         alloc_workqueue("%s", WQ_MEM_RECLAIM,  !! 415         alloc_workqueue("%s", __WQ_LEGACY | WQ_MEM_RECLAIM, 1, (name))
436 #define create_freezable_workqueue(name)          416 #define create_freezable_workqueue(name)                                \
437         alloc_workqueue("%s", WQ_FREEZABLE | W !! 417         alloc_workqueue("%s", __WQ_LEGACY | WQ_FREEZABLE | WQ_UNBOUND | \
438                         1, (name))             !! 418                         WQ_MEM_RECLAIM, 1, (name))
439 #define create_singlethread_workqueue(name)       419 #define create_singlethread_workqueue(name)                             \
440         alloc_workqueue("%s", WQ_UNBOUND | WQ_ !! 420         alloc_ordered_workqueue("%s", __WQ_LEGACY | WQ_MEM_RECLAIM, name)
441                                                   421 
442 extern void destroy_workqueue(struct workqueue    422 extern void destroy_workqueue(struct workqueue_struct *wq);
443                                                   423 
444 struct workqueue_attrs *alloc_workqueue_attrs(    424 struct workqueue_attrs *alloc_workqueue_attrs(gfp_t gfp_mask);
445 void free_workqueue_attrs(struct workqueue_att    425 void free_workqueue_attrs(struct workqueue_attrs *attrs);
446 int apply_workqueue_attrs(struct workqueue_str    426 int apply_workqueue_attrs(struct workqueue_struct *wq,
447                           const struct workque    427                           const struct workqueue_attrs *attrs);
                                                   >> 428 int workqueue_set_unbound_cpumask(cpumask_var_t cpumask);
448                                                   429 
449 extern bool queue_work_on(int cpu, struct work    430 extern bool queue_work_on(int cpu, struct workqueue_struct *wq,
450                         struct work_struct *wo    431                         struct work_struct *work);
451 extern bool queue_delayed_work_on(int cpu, str    432 extern bool queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
452                         struct delayed_work *w    433                         struct delayed_work *work, unsigned long delay);
453 extern bool mod_delayed_work_on(int cpu, struc    434 extern bool mod_delayed_work_on(int cpu, struct workqueue_struct *wq,
454                         struct delayed_work *d    435                         struct delayed_work *dwork, unsigned long delay);
455                                                   436 
456 extern void flush_workqueue(struct workqueue_s    437 extern void flush_workqueue(struct workqueue_struct *wq);
457 extern void drain_workqueue(struct workqueue_s    438 extern void drain_workqueue(struct workqueue_struct *wq);
458 extern void flush_scheduled_work(void);        << 
459                                                   439 
460 extern int schedule_on_each_cpu(work_func_t fu    440 extern int schedule_on_each_cpu(work_func_t func);
461                                                   441 
462 int execute_in_process_context(work_func_t fn,    442 int execute_in_process_context(work_func_t fn, struct execute_work *);
463                                                   443 
464 extern bool flush_work(struct work_struct *wor    444 extern bool flush_work(struct work_struct *work);
465 extern bool cancel_work_sync(struct work_struc    445 extern bool cancel_work_sync(struct work_struct *work);
466                                                   446 
467 extern bool flush_delayed_work(struct delayed_    447 extern bool flush_delayed_work(struct delayed_work *dwork);
468 extern bool cancel_delayed_work(struct delayed    448 extern bool cancel_delayed_work(struct delayed_work *dwork);
469 extern bool cancel_delayed_work_sync(struct de    449 extern bool cancel_delayed_work_sync(struct delayed_work *dwork);
470                                                   450 
471 extern void workqueue_set_max_active(struct wo    451 extern void workqueue_set_max_active(struct workqueue_struct *wq,
472                                      int max_a    452                                      int max_active);
473 extern bool current_is_workqueue_rescuer(void)    453 extern bool current_is_workqueue_rescuer(void);
474 extern bool workqueue_congested(int cpu, struc    454 extern bool workqueue_congested(int cpu, struct workqueue_struct *wq);
475 extern unsigned int work_busy(struct work_stru    455 extern unsigned int work_busy(struct work_struct *work);
476 extern __printf(1, 2) void set_worker_desc(con    456 extern __printf(1, 2) void set_worker_desc(const char *fmt, ...);
477 extern void print_worker_info(const char *log_    457 extern void print_worker_info(const char *log_lvl, struct task_struct *task);
                                                   >> 458 extern void show_workqueue_state(void);
478                                                   459 
479 /**                                               460 /**
480  * queue_work - queue work on a workqueue         461  * queue_work - queue work on a workqueue
481  * @wq: workqueue to use                          462  * @wq: workqueue to use
482  * @work: work to queue                           463  * @work: work to queue
483  *                                                464  *
484  * Returns %false if @work was already on a qu    465  * Returns %false if @work was already on a queue, %true otherwise.
485  *                                                466  *
486  * We queue the work to the CPU on which it wa    467  * We queue the work to the CPU on which it was submitted, but if the CPU dies
487  * it can be processed by another CPU.            468  * it can be processed by another CPU.
488  */                                               469  */
489 static inline bool queue_work(struct workqueue    470 static inline bool queue_work(struct workqueue_struct *wq,
490                               struct work_stru    471                               struct work_struct *work)
491 {                                                 472 {
492         return queue_work_on(WORK_CPU_UNBOUND,    473         return queue_work_on(WORK_CPU_UNBOUND, wq, work);
493 }                                                 474 }
494                                                   475 
495 /**                                               476 /**
496  * queue_delayed_work - queue work on a workqu    477  * queue_delayed_work - queue work on a workqueue after delay
497  * @wq: workqueue to use                          478  * @wq: workqueue to use
498  * @dwork: delayable work to queue                479  * @dwork: delayable work to queue
499  * @delay: number of jiffies to wait before qu    480  * @delay: number of jiffies to wait before queueing
500  *                                                481  *
501  * Equivalent to queue_delayed_work_on() but t    482  * Equivalent to queue_delayed_work_on() but tries to use the local CPU.
502  */                                               483  */
503 static inline bool queue_delayed_work(struct w    484 static inline bool queue_delayed_work(struct workqueue_struct *wq,
504                                       struct d    485                                       struct delayed_work *dwork,
505                                       unsigned    486                                       unsigned long delay)
506 {                                                 487 {
507         return queue_delayed_work_on(WORK_CPU_    488         return queue_delayed_work_on(WORK_CPU_UNBOUND, wq, dwork, delay);
508 }                                                 489 }
509                                                   490 
510 /**                                               491 /**
511  * mod_delayed_work - modify delay of or queue    492  * mod_delayed_work - modify delay of or queue a delayed work
512  * @wq: workqueue to use                          493  * @wq: workqueue to use
513  * @dwork: work to queue                          494  * @dwork: work to queue
514  * @delay: number of jiffies to wait before qu    495  * @delay: number of jiffies to wait before queueing
515  *                                                496  *
516  * mod_delayed_work_on() on local CPU.            497  * mod_delayed_work_on() on local CPU.
517  */                                               498  */
518 static inline bool mod_delayed_work(struct wor    499 static inline bool mod_delayed_work(struct workqueue_struct *wq,
519                                     struct del    500                                     struct delayed_work *dwork,
520                                     unsigned l    501                                     unsigned long delay)
521 {                                                 502 {
522         return mod_delayed_work_on(WORK_CPU_UN    503         return mod_delayed_work_on(WORK_CPU_UNBOUND, wq, dwork, delay);
523 }                                                 504 }
524                                                   505 
525 /**                                               506 /**
526  * schedule_work_on - put work task on a speci    507  * schedule_work_on - put work task on a specific cpu
527  * @cpu: cpu to put the work task on              508  * @cpu: cpu to put the work task on
528  * @work: job to be done                          509  * @work: job to be done
529  *                                                510  *
530  * This puts a job on a specific cpu              511  * This puts a job on a specific cpu
531  */                                               512  */
532 static inline bool schedule_work_on(int cpu, s    513 static inline bool schedule_work_on(int cpu, struct work_struct *work)
533 {                                                 514 {
534         return queue_work_on(cpu, system_wq, w    515         return queue_work_on(cpu, system_wq, work);
535 }                                                 516 }
536                                                   517 
537 /**                                               518 /**
538  * schedule_work - put work task in global wor    519  * schedule_work - put work task in global workqueue
539  * @work: job to be done                          520  * @work: job to be done
540  *                                                521  *
541  * Returns %false if @work was already on the     522  * Returns %false if @work was already on the kernel-global workqueue and
542  * %true otherwise.                               523  * %true otherwise.
543  *                                                524  *
544  * This puts a job in the kernel-global workqu    525  * This puts a job in the kernel-global workqueue if it was not already
545  * queued and leaves it in the same position o    526  * queued and leaves it in the same position on the kernel-global
546  * workqueue otherwise.                           527  * workqueue otherwise.
547  */                                               528  */
548 static inline bool schedule_work(struct work_s    529 static inline bool schedule_work(struct work_struct *work)
549 {                                                 530 {
550         return queue_work(system_wq, work);       531         return queue_work(system_wq, work);
551 }                                                 532 }
552                                                   533 
553 /**                                               534 /**
                                                   >> 535  * flush_scheduled_work - ensure that any scheduled work has run to completion.
                                                   >> 536  *
                                                   >> 537  * Forces execution of the kernel-global workqueue and blocks until its
                                                   >> 538  * completion.
                                                   >> 539  *
                                                   >> 540  * Think twice before calling this function!  It's very easy to get into
                                                   >> 541  * trouble if you don't take great care.  Either of the following situations
                                                   >> 542  * will lead to deadlock:
                                                   >> 543  *
                                                   >> 544  *      One of the work items currently on the workqueue needs to acquire
                                                   >> 545  *      a lock held by your code or its caller.
                                                   >> 546  *
                                                   >> 547  *      Your code is running in the context of a work routine.
                                                   >> 548  *
                                                   >> 549  * They will be detected by lockdep when they occur, but the first might not
                                                   >> 550  * occur very often.  It depends on what work items are on the workqueue and
                                                   >> 551  * what locks they need, which you have no control over.
                                                   >> 552  *
                                                   >> 553  * In most situations flushing the entire workqueue is overkill; you merely
                                                   >> 554  * need to know that a particular work item isn't queued and isn't running.
                                                   >> 555  * In such cases you should use cancel_delayed_work_sync() or
                                                   >> 556  * cancel_work_sync() instead.
                                                   >> 557  */
                                                   >> 558 static inline void flush_scheduled_work(void)
                                                   >> 559 {
                                                   >> 560         flush_workqueue(system_wq);
                                                   >> 561 }
                                                   >> 562 
                                                   >> 563 /**
554  * schedule_delayed_work_on - queue work in gl    564  * schedule_delayed_work_on - queue work in global workqueue on CPU after delay
555  * @cpu: cpu to use                               565  * @cpu: cpu to use
556  * @dwork: job to be done                         566  * @dwork: job to be done
557  * @delay: number of jiffies to wait              567  * @delay: number of jiffies to wait
558  *                                                568  *
559  * After waiting for a given time this puts a     569  * After waiting for a given time this puts a job in the kernel-global
560  * workqueue on the specified CPU.                570  * workqueue on the specified CPU.
561  */                                               571  */
562 static inline bool schedule_delayed_work_on(in    572 static inline bool schedule_delayed_work_on(int cpu, struct delayed_work *dwork,
563                                             un    573                                             unsigned long delay)
564 {                                                 574 {
565         return queue_delayed_work_on(cpu, syst    575         return queue_delayed_work_on(cpu, system_wq, dwork, delay);
566 }                                                 576 }
567                                                   577 
568 /**                                               578 /**
569  * schedule_delayed_work - put work task in gl    579  * schedule_delayed_work - put work task in global workqueue after delay
570  * @dwork: job to be done                         580  * @dwork: job to be done
571  * @delay: number of jiffies to wait or 0 for     581  * @delay: number of jiffies to wait or 0 for immediate execution
572  *                                                582  *
573  * After waiting for a given time this puts a     583  * After waiting for a given time this puts a job in the kernel-global
574  * workqueue.                                     584  * workqueue.
575  */                                               585  */
576 static inline bool schedule_delayed_work(struc    586 static inline bool schedule_delayed_work(struct delayed_work *dwork,
577                                          unsig    587                                          unsigned long delay)
578 {                                                 588 {
579         return queue_delayed_work(system_wq, d    589         return queue_delayed_work(system_wq, dwork, delay);
580 }                                                 590 }
581                                                   591 
582 /**                                               592 /**
583  * keventd_up - is workqueue initialized yet?     593  * keventd_up - is workqueue initialized yet?
584  */                                               594  */
585 static inline bool keventd_up(void)               595 static inline bool keventd_up(void)
586 {                                                 596 {
587         return system_wq != NULL;                 597         return system_wq != NULL;
588 }                                                 598 }
589                                                   599 
590 /* used to be different but now identical to f << 
591 static inline bool __deprecated flush_work_syn << 
592 {                                              << 
593         return flush_work(work);               << 
594 }                                              << 
595                                                << 
596 /* used to be different but now identical to f << 
597 static inline bool __deprecated flush_delayed_ << 
598 {                                              << 
599         return flush_delayed_work(dwork);      << 
600 }                                              << 
601                                                << 
602 #ifndef CONFIG_SMP                                600 #ifndef CONFIG_SMP
603 static inline long work_on_cpu(int cpu, long (    601 static inline long work_on_cpu(int cpu, long (*fn)(void *), void *arg)
604 {                                                 602 {
605         return fn(arg);                           603         return fn(arg);
606 }                                                 604 }
607 #else                                             605 #else
608 long work_on_cpu(int cpu, long (*fn)(void *),     606 long work_on_cpu(int cpu, long (*fn)(void *), void *arg);
609 #endif /* CONFIG_SMP */                           607 #endif /* CONFIG_SMP */
610                                                   608 
611 #ifdef CONFIG_FREEZER                             609 #ifdef CONFIG_FREEZER
612 extern void freeze_workqueues_begin(void);        610 extern void freeze_workqueues_begin(void);
613 extern bool freeze_workqueues_busy(void);         611 extern bool freeze_workqueues_busy(void);
614 extern void thaw_workqueues(void);                612 extern void thaw_workqueues(void);
615 #endif /* CONFIG_FREEZER */                       613 #endif /* CONFIG_FREEZER */
616                                                   614 
617 #ifdef CONFIG_SYSFS                               615 #ifdef CONFIG_SYSFS
618 int workqueue_sysfs_register(struct workqueue_    616 int workqueue_sysfs_register(struct workqueue_struct *wq);
619 #else   /* CONFIG_SYSFS */                        617 #else   /* CONFIG_SYSFS */
620 static inline int workqueue_sysfs_register(str    618 static inline int workqueue_sysfs_register(struct workqueue_struct *wq)
621 { return 0; }                                     619 { return 0; }
622 #endif  /* CONFIG_SYSFS */                        620 #endif  /* CONFIG_SYSFS */
                                                   >> 621 
                                                   >> 622 #ifdef CONFIG_WQ_WATCHDOG
                                                   >> 623 void wq_watchdog_touch(int cpu);
                                                   >> 624 #else   /* CONFIG_WQ_WATCHDOG */
                                                   >> 625 static inline void wq_watchdog_touch(int cpu) { }
                                                   >> 626 #endif  /* CONFIG_WQ_WATCHDOG */
623                                                   627 
624 #endif                                            628 #endif
625                                                   629 

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