libcfs/include/libcfs/linux/linux-wait.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __LIBCFS_LINUX_WAIT_BIT_H
   3 #define __LIBCFS_LINUX_WAIT_BIT_H
   4
   5 /* Make sure we can see if we have TASK_NOLOAD */
   6 #include <linux/sched.h>
   7 /*
   8  * Linux wait-bit related types and methods:
   9  */
  10 #ifdef HAVE_WAIT_BIT_HEADER_H
  11 #include <linux/wait_bit.h>
  12 #endif
  13 #include <linux/wait.h>
  14
  15 #ifndef HAVE_WAIT_QUEUE_ENTRY
  16 #define wait_queue_entry_t wait_queue_t
  17 #endif
  18
  19 #ifndef HAVE_WAIT_BIT_HEADER_H
  20 struct wait_bit_queue_entry {
  21         struct wait_bit_key     key;
  22         wait_queue_entry_t      wq_entry;
  23 };
  24
  25 #define ___wait_is_interruptible(state)                                         \
  26         (!__builtin_constant_p(state) ||                                        \
  27                 state == TASK_INTERRUPTIBLE || state == TASK_KILLABLE)          \
  28
  29 #endif /* ! HAVE_WAIT_BIT_HEADER_H */
  30
  31 #ifndef HAVE_PREPARE_TO_WAIT_EVENT
  32 extern long prepare_to_wait_event(wait_queue_head_t *wq_head,
  33                                   wait_queue_entry_t *wq_entry, int state);
  34 #endif
  35
  36 /* ___wait_cond_timeout changed number of args in v3.12-rc1-78-g35a2af94c7ce
  37  * so let's define our own ___wait_cond_timeout1
  38  */
  39
  40 #define ___wait_cond_timeout1(condition)                                \
  41 ({                                                                      \
  42         bool __cond = (condition);                                      \
  43         if (__cond && !__ret)                                           \
  44                 __ret = 1;                                              \
  45         __cond || !__ret;                                               \
  46 })
  47
  48 #ifndef HAVE_CLEAR_AND_WAKE_UP_BIT
  49 /**
  50  * clear_and_wake_up_bit - clear a bit and wake up anyone waiting on that bit
  51  *
  52  * @bit: the bit of the word being waited on
  53  * @word: the word being waited on, a kernel virtual address
  54  *
  55  * You can use this helper if bitflags are manipulated atomically rather than
  56  * non-atomically under a lock.
  57  */
  58 static inline void clear_and_wake_up_bit(int bit, void *word)
  59 {
  60         clear_bit_unlock(bit, word);
  61         /* See wake_up_bit() for which memory barrier you need to use. */
  62         smp_mb__after_atomic();
  63         wake_up_bit(word, bit);
  64 }
  65 #endif /* ! HAVE_CLEAR_AND_WAKE_UP_BIT */
  66
  67 #ifndef HAVE_WAIT_VAR_EVENT
  68 extern void __init wait_bit_init(void);
  69 extern void init_wait_var_entry(struct wait_bit_queue_entry *wbq_entry,
  70                                 void *var, int flags);
  71 extern void wake_up_var(void *var);
  72 extern wait_queue_head_t *__var_waitqueue(void *p);
  73
  74 #define ___wait_var_event(var, condition, state, exclusive, ret, cmd)   \
  75 ({                                                                      \
  76         __label__ __out;                                                \
  77         wait_queue_head_t *__wq_head = __var_waitqueue(var);            \
  78         struct wait_bit_queue_entry __wbq_entry;                        \
  79         long __ret = ret; /* explicit shadow */                         \
  80                                                                         \
  81         init_wait_var_entry(&__wbq_entry, var,                          \
  82                             exclusive ? WQ_FLAG_EXCLUSIVE : 0);         \
  83         for (;;) {                                                      \
  84                 long __int = prepare_to_wait_event(__wq_head,           \
  85                                                    &__wbq_entry.wq_entry, \
  86                                                    state);              \
  87                 if (condition)                                          \
  88                         break;                                          \
  89                                                                         \
  90                 if (___wait_is_interruptible(state) && __int) {         \
  91                         __ret = __int;                                  \
  92                         goto __out;                                     \
  93                 }                                                       \
  94                                                                         \
  95                 cmd;                                                    \
  96         }                                                               \
  97         finish_wait(__wq_head, &__wbq_entry.wq_entry);                  \
  98 __out:  __ret;                                                          \
  99 })
 100
 101 #define __wait_var_event(var, condition)                                \
 102         ___wait_var_event(var, condition, TASK_UNINTERRUPTIBLE, 0, 0,   \
 103                           schedule())
 104
 105 #define wait_var_event(var, condition)                                  \
 106 do {                                                                    \
 107         might_sleep();                                                  \
 108         if (condition)                                                  \
 109                 break;                                                  \
 110         __wait_var_event(var, condition);                               \
 111 } while (0)
 112
 113 #define __wait_var_event_killable(var, condition)                       \
 114         ___wait_var_event(var, condition, TASK_KILLABLE, 0, 0,          \
 115                           schedule())
 116
 117 #define wait_var_event_killable(var, condition)                         \
 118 ({                                                                      \
 119         int __ret = 0;                                                  \
 120         might_sleep();                                                  \
 121         if (!(condition))                                               \
 122                 __ret = __wait_var_event_killable(var, condition);      \
 123         __ret;                                                          \
 124 })
 125
 126 #define __wait_var_event_timeout(var, condition, timeout)               \
 127         ___wait_var_event(var, ___wait_cond_timeout1(condition),        \
 128                           TASK_UNINTERRUPTIBLE, 0, timeout,             \
 129                           __ret = schedule_timeout(__ret))
 130
 131 #define wait_var_event_timeout(var, condition, timeout)                 \
 132 ({                                                                      \
 133         long __ret = timeout;                                           \
 134         might_sleep();                                                  \
 135         if (!___wait_cond_timeout1(condition))                          \
 136                 __ret = __wait_var_event_timeout(var, condition, timeout); \
 137         __ret;                                                          \
 138 })
 139 #endif /* ! HAVE_WAIT_VAR_EVENT */
 140
 141 /*
 142  * prepare_to_wait_event() does not support an exclusive
 143  * lifo wait.
 144  * However it will not relink the wait_queue_entry if
 145  * it is already linked.  So we link to the head of the
 146  * queue here, and it will stay there.
 147  */
 148 static inline void prepare_to_wait_exclusive_head(
 149         wait_queue_head_t *waitq, wait_queue_entry_t *link)
 150 {
 151         unsigned long flags;
 152
 153         spin_lock_irqsave(&(waitq->lock), flags);
 154 #ifdef HAVE_WAIT_QUEUE_ENTRY_LIST
 155         if (list_empty(&link->entry))
 156 #else
 157         if (list_empty(&link->task_list))
 158 #endif
 159                 __add_wait_queue_exclusive(waitq, link);
 160         spin_unlock_irqrestore(&((waitq)->lock), flags);
 161 }
 162
 163 #ifndef ___wait_event
 164 /*
 165  * The below macro ___wait_event() has an explicit shadow of the __ret
 166  * variable when used from the wait_event_*() macros.
 167  *
 168  * This is so that both can use the ___wait_cond_timeout1() construct
 169  * to wrap the condition.
 170  *
 171  * The type inconsistency of the wait_event_*() __ret variable is also
 172  * on purpose; we use long where we can return timeout values and int
 173  * otherwise.
 174  */
 175
 176 #define ___wait_event(wq_head, condition, state, exclusive, ret, cmd)   \
 177 ({                                                                      \
 178         __label__ __out;                                                \
 179         wait_queue_entry_ __wq_entry;                                   \
 180         long __ret = ret;       /* explicit shadow */                   \
 181                                                                         \
 182         init_wait(&__wq_entry);                                         \
 183         if (exclusive)                                                  \
 184                 __wq_entry.flags = WQ_FLAG_EXCLUSIVE                    \
 185         for (;;) {                                                      \
 186                 long __int = prepare_to_wait_event(&wq_head,            \
 187                                                   &__wq_entry, state);  \
 188                                                                         \
 189                 if (condition)                                          \
 190                         break;                                          \
 191                                                                         \
 192                 if (___wait_is_interruptible(state) && __int) {         \
 193                         __ret = __int;                                  \
 194                         goto __out;                                     \
 195                 }                                                       \
 196                                                                         \
 197                 cmd;                                                    \
 198         }                                                               \
 199         finish_wait(&wq_head, &__wq_entry);                             \
 200 __out:  __ret;                                                          \
 201 })
 202 #endif
 203
 204 #ifndef TASK_NOLOAD
 205
 206 #define ___wait_event_idle(wq_head, condition, exclusive, ret, cmd)     \
 207 ({                                                                      \
 208         wait_queue_entry_t __wq_entry;                                  \
 209         unsigned long flags;                                            \
 210         long __ret = ret;       /* explicit shadow */                   \
 211         sigset_t __blocked;                                             \
 212                                                                         \
 213         __blocked = cfs_block_sigsinv(0);                               \
 214         init_wait(&__wq_entry);                                         \
 215         if (exclusive)                                                  \
 216                 __wq_entry.flags = WQ_FLAG_EXCLUSIVE;                   \
 217         for (;;) {                                                      \
 218                 prepare_to_wait_event(&wq_head,                         \
 219                                    &__wq_entry,                         \
 220                                    TASK_INTERRUPTIBLE);                 \
 221                                                                         \
 222                 if (condition)                                          \
 223                         break;                                          \
 224                 /* See justification in __l_wait_event */               \
 225                 if (signal_pending(current)) {                          \
 226                         spin_lock_irqsave(&current->sighand->siglock,   \
 227                                           flags);                       \
 228                         clear_tsk_thread_flag(current, TIF_SIGPENDING); \
 229                         spin_unlock_irqrestore(&current->sighand->siglock,\
 230                                                flags);                  \
 231                 }                                                       \
 232                 cmd;                                                    \
 233         }                                                               \
 234         finish_wait(&wq_head, &__wq_entry);                             \
 235         cfs_restore_sigs(__blocked);                                    \
 236         __ret;                                                          \
 237 })
 238
 239 #define wait_event_idle(wq_head, condition)                             \
 240 do {                                                                    \
 241         might_sleep();                                                  \
 242         if (!(condition))                                               \
 243                 ___wait_event_idle(wq_head, condition, 0, 0, schedule());\
 244 } while (0)
 245
 246 #define wait_event_idle_exclusive(wq_head, condition)                   \
 247 do {                                                                    \
 248         might_sleep();                                                  \
 249         if (!(condition))                                               \
 250                 ___wait_event_idle(wq_head, condition, 1, 0, schedule());\
 251 } while (0)
 252
 253 #define __wait_event_idle_exclusive_timeout(wq_head, condition, timeout)\
 254         ___wait_event_idle(wq_head, ___wait_cond_timeout1(condition),   \
 255                            1, timeout,                                  \
 256                            __ret = schedule_timeout(__ret))
 257
 258 #define wait_event_idle_exclusive_timeout(wq_head, condition, timeout)  \
 259 ({                                                                      \
 260         long __ret = timeout;                                           \
 261         might_sleep();                                                  \
 262         if (!___wait_cond_timeout1(condition))                          \
 263                 __ret = __wait_event_idle_exclusive_timeout(            \
 264                         wq_head, condition, timeout);                   \
 265         __ret;                                                          \
 266 })
 267
 268 #define __wait_event_idle_exclusive_timeout_cmd(wq_head, condition,     \
 269                                                 timeout, cmd1, cmd2)    \
 270         ___wait_event_idle(wq_head, ___wait_cond_timeout1(condition),   \
 271                            1, timeout,                                  \
 272                            cmd1; __ret = schedule_timeout(__ret); cmd2)
 273
 274 #define wait_event_idle_exclusive_timeout_cmd(wq_head, condition, timeout,\
 275                                               cmd1, cmd2)               \
 276 ({                                                                      \
 277         long __ret = timeout;                                           \
 278         might_sleep();                                                  \
 279         if (!___wait_cond_timeout1(condition))                          \
 280                 __ret = __wait_event_idle_exclusive_timeout_cmd(        \
 281                         wq_head, condition, timeout, cmd1, cmd2);       \
 282         __ret;                                                          \
 283 })
 284
 285 #define __wait_event_idle_timeout(wq_head, condition, timeout)          \
 286         ___wait_event_idle(wq_head, ___wait_cond_timeout1(condition),   \
 287                            0, timeout,                                  \
 288                            __ret = schedule_timeout(__ret))
 289
 290 #define wait_event_idle_timeout(wq_head, condition, timeout)            \
 291 ({                                                                      \
 292         long __ret = timeout;                                           \
 293         might_sleep();                                                  \
 294         if (!___wait_cond_timeout1(condition))                          \
 295                 __ret = __wait_event_idle_timeout(wq_head, condition,   \
 296                                                   timeout);             \
 297         __ret;                                                          \
 298 })
 299
 300 #else /* TASK_IDLE */
 301 #ifndef wait_event_idle
 302 /**
 303  * wait_event_idle - wait for a condition without contributing to system load
 304  * @wq_head: the waitqueue to wait on
 305  * @condition: a C expression for the event to wait for
 306  *
 307  * The process is put to sleep (TASK_IDLE) until the
 308  * @condition evaluates to true.
 309  * The @condition is checked each time the waitqueue @wq_head is woken up.
 310  *
 311  * wake_up() has to be called after changing any variable that could
 312  * change the result of the wait condition.
 313  *
 314  */
 315 #define wait_event_idle(wq_head, condition)                             \
 316 do {                                                                    \
 317         might_sleep();                                                  \
 318         if (!(condition))                                               \
 319                 ___wait_event(wq_head, condition, TASK_IDLE, 0, 0,      \
 320                               schedule());                              \
 321 } while (0)
 322 #endif
 323 #ifndef wait_event_idle_exclusive
 324 /**
 325  * wait_event_idle_exclusive - wait for a condition without contributing to
 326  *               system load
 327  * @wq_head: the waitqueue to wait on
 328  * @condition: a C expression for the event to wait for
 329  *
 330  * The process is put to sleep (TASK_IDLE) until the
 331  * @condition evaluates to true.
 332  * The @condition is checked each time the waitqueue @wq_head is woken up.
 333  *
 334  * The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag
 335  * set thus if other processes wait on the same list, when this
 336  * process is woken further processes are not considered.
 337  *
 338  * wake_up() has to be called after changing any variable that could
 339  * change the result of the wait condition.
 340  *
 341  */
 342 #define wait_event_idle_exclusive(wq_head, condition)                   \
 343 do {                                                                    \
 344         might_sleep();                                                  \
 345         if (!(condition))                                               \
 346                 ___wait_event(wq_head, condition, TASK_IDLE, 1, 0,      \
 347                               schedule());                              \
 348 } while (0)
 349 #endif
 350 #ifndef wait_event_idle_exclusive_timeout
 351 /**
 352  * wait_event_idle_exclusive_timeout - sleep without load until a condition
 353  *                       becomes true or a timeout elapses
 354  * @wq_head: the waitqueue to wait on
 355  * @condition: a C expression for the event to wait for
 356  * @timeout: timeout, in jiffies
 357  *
 358  * The process is put to sleep (TASK_IDLE) until the
 359  * @condition evaluates to true. The @condition is checked each time
 360  * the waitqueue @wq_head is woken up.
 361  *
 362  * The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag
 363  * set thus if other processes wait on the same list, when this
 364  * process is woken further processes are not considered.
 365  *
 366  * wake_up() has to be called after changing any variable that could
 367  * change the result of the wait condition.
 368  *
 369  * Returns:
 370  * 0 if the @condition evaluated to %false after the @timeout elapsed,
 371  * 1 if the @condition evaluated to %true after the @timeout elapsed,
 372  * or the remaining jiffies (at least 1) if the @condition evaluated
 373  * to %true before the @timeout elapsed.
 374  */
 375 #define wait_event_idle_exclusive_timeout(wq_head, condition, timeout)  \
 376 ({                                                                      \
 377         long __ret = timeout;                                           \
 378         might_sleep();                                                  \
 379         if (!___wait_cond_timeout1(condition))                          \
 380                 __ret = __wait_event_idle_exclusive_timeout(wq_head,    \
 381                                                             condition,  \
 382                                                             timeout);   \
 383         __ret;                                                          \
 384 })
 385 #endif
 386 #ifndef wait_event_idle_exclusive_timeout_cmd
 387 #define __wait_event_idle_exclusive_timeout_cmd(wq_head, condition,     \
 388                                                 timeout, cmd1, cmd2)    \
 389         ___wait_event(wq_head, ___wait_cond_timeout1(condition),        \
 390                       TASK_IDLE, 1, timeout,                            \
 391                       cmd1; __ret = schedule_timeout(__ret); cmd2)
 392
 393 #define wait_event_idle_exclusive_timeout_cmd(wq_head, condition, timeout,\
 394                                               cmd1, cmd2)               \
 395 ({                                                                      \
 396         long __ret = timeout;                                           \
 397         might_sleep();                                                  \
 398         if (!___wait_cond_timeout1(condition))                          \
 399                 __ret = __wait_event_idle_exclusive_timeout_cmd(        \
 400                         wq_head, condition, timeout, cmd1, cmd2);       \
 401         __ret;                                                          \
 402 })
 403 #endif
 404
 405 #ifndef wait_event_idle_timeout
 406
 407 #define __wait_event_idle_timeout(wq_head, condition, timeout)          \
 408         ___wait_event(wq_head, ___wait_cond_timeout1(condition),        \
 409                       TASK_IDLE, 0, timeout,                            \
 410                       __ret = schedule_timeout(__ret))
 411
 412 /**
 413  * wait_event_idle_timeout - sleep without load until a condition becomes
 414  *                           true or a timeout elapses
 415  * @wq_head: the waitqueue to wait on
 416  * @condition: a C expression for the event to wait for
 417  * @timeout: timeout, in jiffies
 418  *
 419  * The process is put to sleep (TASK_IDLE) until the
 420  * @condition evaluates to true. The @condition is checked each time
 421  * the waitqueue @wq_head is woken up.
 422  *
 423  * wake_up() has to be called after changing any variable that could
 424  * change the result of the wait condition.
 425  *
 426  * Returns:
 427  * 0 if the @condition evaluated to %false after the @timeout elapsed,
 428  * 1 if the @condition evaluated to %true after the @timeout elapsed,
 429  * or the remaining jiffies (at least 1) if the @condition evaluated
 430  * to %true before the @timeout elapsed.
 431  */
 432 #define wait_event_idle_timeout(wq_head, condition, timeout)            \
 433 ({                                                                      \
 434         long __ret = timeout;                                           \
 435         might_sleep();                                                  \
 436         if (!___wait_cond_timeout1(condition))                          \
 437                 __ret = __wait_event_idle_timeout(wq_head, condition,   \
 438                                                   timeout);             \
 439         __ret;                                                          \
 440 })
 441 #endif
 442 #endif /* TASK_IDLE */
 443
 444 /* ___wait_event_lifo is used for lifo exclusive 'idle' waits */
 445 #ifdef TASK_NOLOAD
 446
 447 #define ___wait_event_lifo(wq_head, condition, ret, cmd)                \
 448 ({                                                                      \
 449         wait_queue_entry_t       __wq_entry;                            \
 450         long __ret = ret;       /* explicit shadow */                   \
 451                                                                         \
 452         init_wait(&__wq_entry);                                         \
 453         __wq_entry.flags =  WQ_FLAG_EXCLUSIVE;                          \
 454         for (;;) {                                                      \
 455                 prepare_to_wait_exclusive_head(&wq_head, &__wq_entry);  \
 456                 prepare_to_wait_event(&wq_head, &__wq_entry, TASK_IDLE);\
 457                                                                         \
 458                 if (condition)                                          \
 459                         break;                                          \
 460                                                                         \
 461                 cmd;                                                    \
 462         }                                                               \
 463         finish_wait(&wq_head, &__wq_entry);                             \
 464         __ret;                                                          \
 465 })
 466 #else
 467 #define ___wait_event_lifo(wq_head, condition, ret, cmd)                \
 468 ({                                                                      \
 469         wait_queue_entry_t __wq_entry;                                  \
 470         unsigned long flags;                                            \
 471         long __ret = ret;       /* explicit shadow */                   \
 472         sigset_t __blocked;                                             \
 473                                                                         \
 474         __blocked = cfs_block_sigsinv(0);                               \
 475         init_wait(&__wq_entry);                                         \
 476         __wq_entry.flags = WQ_FLAG_EXCLUSIVE;                           \
 477         for (;;) {                                                      \
 478                 prepare_to_wait_exclusive_head(&wq_head, &__wq_entry);  \
 479                 prepare_to_wait_event(&wq_head, &__wq_entry,            \
 480                                       TASK_INTERRUPTIBLE);              \
 481                                                                         \
 482                 if (condition)                                          \
 483                         break;                                          \
 484                 /* See justification in __l_wait_event */               \
 485                 if (signal_pending(current)) {                          \
 486                         spin_lock_irqsave(&current->sighand->siglock,   \
 487                                           flags);                       \
 488                         clear_tsk_thread_flag(current, TIF_SIGPENDING); \
 489                         spin_unlock_irqrestore(&current->sighand->siglock,\
 490                                                flags);                  \
 491                 }                                                       \
 492                 cmd;                                                    \
 493         }                                                               \
 494         cfs_restore_sigs(__blocked);                                    \
 495         finish_wait(&wq_head, &__wq_entry);                             \
 496         __ret;                                                          \
 497 })
 498 #endif
 499
 500 #define wait_event_idle_exclusive_lifo(wq_head, condition)              \
 501 do {                                                                    \
 502         might_sleep();                                                  \
 503         if (!(condition))                                               \
 504                 ___wait_event_lifo(wq_head, condition, 0, schedule());  \
 505 } while (0)
 506
 507 #define __wait_event_idle_lifo_timeout(wq_head, condition, timeout)     \
 508         ___wait_event_lifo(wq_head, ___wait_cond_timeout1(condition),   \
 509                            timeout,                                     \
 510                            __ret = schedule_timeout(__ret))
 511
 512 #define wait_event_idle_exclusive_lifo_timeout(wq_head, condition, timeout)\
 513 ({                                                                      \
 514         long __ret = timeout;                                           \
 515         might_sleep();                                                  \
 516         if (!___wait_cond_timeout1(condition))                          \
 517                 __ret = __wait_event_idle_lifo_timeout(wq_head,         \
 518                                                        condition,       \
 519                                                        timeout);        \
 520         __ret;                                                          \
 521 })
 522
 523 /* l_wait_event_abortable() is a bit like wait_event_killable()
 524  * except there is a fixed set of signals which will abort:
 525  * LUSTRE_FATAL_SIGS
 526  */
 527 #define LUSTRE_FATAL_SIGS                                        \
 528         (sigmask(SIGKILL) | sigmask(SIGINT) | sigmask(SIGTERM) | \
 529          sigmask(SIGQUIT) | sigmask(SIGALRM))
 530
 531 #define l_wait_event_abortable(wq, condition)                           \
 532 ({                                                                      \
 533         sigset_t __new_blocked, __old_blocked;                          \
 534         int __ret = 0;                                                  \
 535         siginitsetinv(&__new_blocked, LUSTRE_FATAL_SIGS);               \
 536         sigprocmask(SIG_BLOCK, &__new_blocked, &__old_blocked);         \
 537         __ret = wait_event_interruptible(wq, condition);                \
 538         sigprocmask(SIG_SETMASK, &__old_blocked, NULL);                 \
 539         __ret;                                                          \
 540 })
 541
 542 #define l_wait_event_abortable_timeout(wq, condition, timeout)          \
 543 ({                                                                      \
 544         sigset_t __new_blocked, __old_blocked;                          \
 545         int __ret = 0;                                                  \
 546         siginitsetinv(&__new_blocked, LUSTRE_FATAL_SIGS);               \
 547         sigprocmask(SIG_BLOCK, &__new_blocked, &__old_blocked);         \
 548         __ret = wait_event_interruptible_timeout(wq, condition, timeout);\
 549         sigprocmask(SIG_SETMASK, &__old_blocked, NULL);                 \
 550         __ret;                                                          \
 551 })
 552
 553 #define l_wait_event_abortable_exclusive(wq, condition)                 \
 554 ({                                                                      \
 555         sigset_t __new_blocked, __old_blocked;                          \
 556         int __ret = 0;                                                  \
 557         siginitsetinv(&__new_blocked, LUSTRE_FATAL_SIGS);               \
 558         sigprocmask(SIG_BLOCK, &__new_blocked, &__old_blocked);         \
 559         __ret = wait_event_interruptible_exclusive(wq, condition);      \
 560         sigprocmask(SIG_SETMASK, &__old_blocked, NULL);                 \
 561         __ret;                                                          \
 562 })
 563
 564 #endif /* __LICBFS_LINUX_WAIT_BIT_H */