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                 /* We have to do this here because some signals */      \
 225                 /* are not blockable - ie from strace(1).       */      \
 226                 /* In these cases we want to schedule_timeout() */      \
 227                 /* again, because we don't want that to return  */      \
 228                 /* -EINTR when the RPC actually succeeded.      */      \
 229                 /* the recalc_sigpending() below will deliver the */    \
 230                 /* signal properly.                             */      \
 231                 if (signal_pending(current)) {                          \
 232                         spin_lock_irqsave(&current->sighand->siglock,   \
 233                                           flags);                       \
 234                         clear_tsk_thread_flag(current, TIF_SIGPENDING); \
 235                         spin_unlock_irqrestore(&current->sighand->siglock,\
 236                                                flags);                  \
 237                 }                                                       \
 238                 cmd;                                                    \
 239         }                                                               \
 240         finish_wait(&wq_head, &__wq_entry);                             \
 241         cfs_restore_sigs(__blocked);                                    \
 242         __ret;                                                          \
 243 })
 244
 245 #define wait_event_idle(wq_head, condition)                             \
 246 do {                                                                    \
 247         might_sleep();                                                  \
 248         if (!(condition))                                               \
 249                 ___wait_event_idle(wq_head, condition, 0, 0, schedule());\
 250 } while (0)
 251
 252 #define wait_event_idle_exclusive(wq_head, condition)                   \
 253 do {                                                                    \
 254         might_sleep();                                                  \
 255         if (!(condition))                                               \
 256                 ___wait_event_idle(wq_head, condition, 1, 0, schedule());\
 257 } while (0)
 258
 259 #define __wait_event_idle_exclusive_timeout(wq_head, condition, timeout)\
 260         ___wait_event_idle(wq_head, ___wait_cond_timeout1(condition),   \
 261                            1, timeout,                                  \
 262                            __ret = schedule_timeout(__ret))
 263
 264 #define wait_event_idle_exclusive_timeout(wq_head, condition, timeout)  \
 265 ({                                                                      \
 266         long __ret = timeout;                                           \
 267         might_sleep();                                                  \
 268         if (!___wait_cond_timeout1(condition))                          \
 269                 __ret = __wait_event_idle_exclusive_timeout(            \
 270                         wq_head, condition, timeout);                   \
 271         __ret;                                                          \
 272 })
 273
 274 #define __wait_event_idle_exclusive_timeout_cmd(wq_head, condition,     \
 275                                                 timeout, cmd1, cmd2)    \
 276         ___wait_event_idle(wq_head, ___wait_cond_timeout1(condition),   \
 277                            1, timeout,                                  \
 278                            cmd1; __ret = schedule_timeout(__ret); cmd2)
 279
 280 #define wait_event_idle_exclusive_timeout_cmd(wq_head, condition, timeout,\
 281                                               cmd1, cmd2)               \
 282 ({                                                                      \
 283         long __ret = timeout;                                           \
 284         might_sleep();                                                  \
 285         if (!___wait_cond_timeout1(condition))                          \
 286                 __ret = __wait_event_idle_exclusive_timeout_cmd(        \
 287                         wq_head, condition, timeout, cmd1, cmd2);       \
 288         __ret;                                                          \
 289 })
 290
 291 #define __wait_event_idle_timeout(wq_head, condition, timeout)          \
 292         ___wait_event_idle(wq_head, ___wait_cond_timeout1(condition),   \
 293                            0, timeout,                                  \
 294                            __ret = schedule_timeout(__ret))
 295
 296 #define wait_event_idle_timeout(wq_head, condition, timeout)            \
 297 ({                                                                      \
 298         long __ret = timeout;                                           \
 299         might_sleep();                                                  \
 300         if (!___wait_cond_timeout1(condition))                          \
 301                 __ret = __wait_event_idle_timeout(wq_head, condition,   \
 302                                                   timeout);             \
 303         __ret;                                                          \
 304 })
 305
 306 #else /* TASK_IDLE */
 307 #ifndef wait_event_idle
 308 /**
 309  * wait_event_idle - wait for a condition without contributing to system load
 310  * @wq_head: the waitqueue to wait on
 311  * @condition: a C expression for the event to wait for
 312  *
 313  * The process is put to sleep (TASK_IDLE) until the
 314  * @condition evaluates to true.
 315  * The @condition is checked each time the waitqueue @wq_head is woken up.
 316  *
 317  * wake_up() has to be called after changing any variable that could
 318  * change the result of the wait condition.
 319  *
 320  */
 321 #define wait_event_idle(wq_head, condition)                             \
 322 do {                                                                    \
 323         might_sleep();                                                  \
 324         if (!(condition))                                               \
 325                 ___wait_event(wq_head, condition, TASK_IDLE, 0, 0,      \
 326                               schedule());                              \
 327 } while (0)
 328 #endif
 329 #ifndef wait_event_idle_exclusive
 330 /**
 331  * wait_event_idle_exclusive - wait for a condition without contributing to
 332  *               system load
 333  * @wq_head: the waitqueue to wait on
 334  * @condition: a C expression for the event to wait for
 335  *
 336  * The process is put to sleep (TASK_IDLE) until the
 337  * @condition evaluates to true.
 338  * The @condition is checked each time the waitqueue @wq_head is woken up.
 339  *
 340  * The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag
 341  * set thus if other processes wait on the same list, when this
 342  * process is woken further processes are not considered.
 343  *
 344  * wake_up() has to be called after changing any variable that could
 345  * change the result of the wait condition.
 346  *
 347  */
 348 #define wait_event_idle_exclusive(wq_head, condition)                   \
 349 do {                                                                    \
 350         might_sleep();                                                  \
 351         if (!(condition))                                               \
 352                 ___wait_event(wq_head, condition, TASK_IDLE, 1, 0,      \
 353                               schedule());                              \
 354 } while (0)
 355 #endif
 356 #ifndef wait_event_idle_exclusive_timeout
 357 /**
 358  * wait_event_idle_exclusive_timeout - sleep without load until a condition
 359  *                       becomes true or a timeout elapses
 360  * @wq_head: the waitqueue to wait on
 361  * @condition: a C expression for the event to wait for
 362  * @timeout: timeout, in jiffies
 363  *
 364  * The process is put to sleep (TASK_IDLE) until the
 365  * @condition evaluates to true. The @condition is checked each time
 366  * the waitqueue @wq_head is woken up.
 367  *
 368  * The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag
 369  * set thus if other processes wait on the same list, when this
 370  * process is woken further processes are not considered.
 371  *
 372  * wake_up() has to be called after changing any variable that could
 373  * change the result of the wait condition.
 374  *
 375  * Returns:
 376  * 0 if the @condition evaluated to %false after the @timeout elapsed,
 377  * 1 if the @condition evaluated to %true after the @timeout elapsed,
 378  * or the remaining jiffies (at least 1) if the @condition evaluated
 379  * to %true before the @timeout elapsed.
 380  */
 381 #define wait_event_idle_exclusive_timeout(wq_head, condition, timeout)  \
 382 ({                                                                      \
 383         long __ret = timeout;                                           \
 384         might_sleep();                                                  \
 385         if (!___wait_cond_timeout1(condition))                          \
 386                 __ret = __wait_event_idle_exclusive_timeout(wq_head,    \
 387                                                             condition,  \
 388                                                             timeout);   \
 389         __ret;                                                          \
 390 })
 391 #endif
 392 #ifndef wait_event_idle_exclusive_timeout_cmd
 393 #define __wait_event_idle_exclusive_timeout_cmd(wq_head, condition,     \
 394                                                 timeout, cmd1, cmd2)    \
 395         ___wait_event(wq_head, ___wait_cond_timeout1(condition),        \
 396                       TASK_IDLE, 1, timeout,                            \
 397                       cmd1; __ret = schedule_timeout(__ret); cmd2)
 398
 399 #define wait_event_idle_exclusive_timeout_cmd(wq_head, condition, timeout,\
 400                                               cmd1, cmd2)               \
 401 ({                                                                      \
 402         long __ret = timeout;                                           \
 403         might_sleep();                                                  \
 404         if (!___wait_cond_timeout1(condition))                          \
 405                 __ret = __wait_event_idle_exclusive_timeout_cmd(        \
 406                         wq_head, condition, timeout, cmd1, cmd2);       \
 407         __ret;                                                          \
 408 })
 409 #endif
 410
 411 #ifndef wait_event_idle_timeout
 412
 413 #define __wait_event_idle_timeout(wq_head, condition, timeout)          \
 414         ___wait_event(wq_head, ___wait_cond_timeout1(condition),        \
 415                       TASK_IDLE, 0, timeout,                            \
 416                       __ret = schedule_timeout(__ret))
 417
 418 /**
 419  * wait_event_idle_timeout - sleep without load until a condition becomes
 420  *                           true or a timeout elapses
 421  * @wq_head: the waitqueue to wait on
 422  * @condition: a C expression for the event to wait for
 423  * @timeout: timeout, in jiffies
 424  *
 425  * The process is put to sleep (TASK_IDLE) until the
 426  * @condition evaluates to true. The @condition is checked each time
 427  * the waitqueue @wq_head is woken up.
 428  *
 429  * wake_up() has to be called after changing any variable that could
 430  * change the result of the wait condition.
 431  *
 432  * Returns:
 433  * 0 if the @condition evaluated to %false after the @timeout elapsed,
 434  * 1 if the @condition evaluated to %true after the @timeout elapsed,
 435  * or the remaining jiffies (at least 1) if the @condition evaluated
 436  * to %true before the @timeout elapsed.
 437  */
 438 #define wait_event_idle_timeout(wq_head, condition, timeout)            \
 439 ({                                                                      \
 440         long __ret = timeout;                                           \
 441         might_sleep();                                                  \
 442         if (!___wait_cond_timeout1(condition))                          \
 443                 __ret = __wait_event_idle_timeout(wq_head, condition,   \
 444                                                   timeout);             \
 445         __ret;                                                          \
 446 })
 447 #endif
 448 #endif /* TASK_IDLE */
 449
 450 /* ___wait_event_lifo is used for lifo exclusive 'idle' waits */
 451 #ifdef TASK_NOLOAD
 452
 453 #define ___wait_event_lifo(wq_head, condition, ret, cmd)                \
 454 ({                                                                      \
 455         wait_queue_entry_t       __wq_entry;                            \
 456         long __ret = ret;       /* explicit shadow */                   \
 457                                                                         \
 458         init_wait(&__wq_entry);                                         \
 459         __wq_entry.flags =  WQ_FLAG_EXCLUSIVE;                          \
 460         for (;;) {                                                      \
 461                 prepare_to_wait_exclusive_head(&wq_head, &__wq_entry);  \
 462                 prepare_to_wait_event(&wq_head, &__wq_entry, TASK_IDLE);\
 463                                                                         \
 464                 if (condition)                                          \
 465                         break;                                          \
 466                                                                         \
 467                 cmd;                                                    \
 468         }                                                               \
 469         finish_wait(&wq_head, &__wq_entry);                             \
 470         __ret;                                                          \
 471 })
 472 #else
 473 #define ___wait_event_lifo(wq_head, condition, ret, cmd)                \
 474 ({                                                                      \
 475         wait_queue_entry_t __wq_entry;                                  \
 476         unsigned long flags;                                            \
 477         long __ret = ret;       /* explicit shadow */                   \
 478         sigset_t __blocked;                                             \
 479                                                                         \
 480         __blocked = cfs_block_sigsinv(0);                               \
 481         init_wait(&__wq_entry);                                         \
 482         __wq_entry.flags = WQ_FLAG_EXCLUSIVE;                           \
 483         for (;;) {                                                      \
 484                 prepare_to_wait_exclusive_head(&wq_head, &__wq_entry);  \
 485                 prepare_to_wait_event(&wq_head, &__wq_entry,            \
 486                                       TASK_INTERRUPTIBLE);              \
 487                                                                         \
 488                 if (condition)                                          \
 489                         break;                                          \
 490                 /* See justification in ___wait_event_idle */           \
 491                 if (signal_pending(current)) {                          \
 492                         spin_lock_irqsave(&current->sighand->siglock,   \
 493                                           flags);                       \
 494                         clear_tsk_thread_flag(current, TIF_SIGPENDING); \
 495                         spin_unlock_irqrestore(&current->sighand->siglock,\
 496                                                flags);                  \
 497                 }                                                       \
 498                 cmd;                                                    \
 499         }                                                               \
 500         cfs_restore_sigs(__blocked);                                    \
 501         finish_wait(&wq_head, &__wq_entry);                             \
 502         __ret;                                                          \
 503 })
 504 #endif
 505
 506 #define wait_event_idle_exclusive_lifo(wq_head, condition)              \
 507 do {                                                                    \
 508         might_sleep();                                                  \
 509         if (!(condition))                                               \
 510                 ___wait_event_lifo(wq_head, condition, 0, schedule());  \
 511 } while (0)
 512
 513 #define __wait_event_idle_lifo_timeout(wq_head, condition, timeout)     \
 514         ___wait_event_lifo(wq_head, ___wait_cond_timeout1(condition),   \
 515                            timeout,                                     \
 516                            __ret = schedule_timeout(__ret))
 517
 518 #define wait_event_idle_exclusive_lifo_timeout(wq_head, condition, timeout)\
 519 ({                                                                      \
 520         long __ret = timeout;                                           \
 521         might_sleep();                                                  \
 522         if (!___wait_cond_timeout1(condition))                          \
 523                 __ret = __wait_event_idle_lifo_timeout(wq_head,         \
 524                                                        condition,       \
 525                                                        timeout);        \
 526         __ret;                                                          \
 527 })
 528
 529 /* l_wait_event_abortable() is a bit like wait_event_killable()
 530  * except there is a fixed set of signals which will abort:
 531  * LUSTRE_FATAL_SIGS
 532  */
 533 #define LUSTRE_FATAL_SIGS                                        \
 534         (sigmask(SIGKILL) | sigmask(SIGINT) | sigmask(SIGTERM) | \
 535          sigmask(SIGQUIT) | sigmask(SIGALRM))
 536
 537 #define l_wait_event_abortable(wq, condition)                           \
 538 ({                                                                      \
 539         sigset_t __new_blocked, __old_blocked;                          \
 540         int __ret = 0;                                                  \
 541         siginitsetinv(&__new_blocked, LUSTRE_FATAL_SIGS);               \
 542         sigprocmask(SIG_BLOCK, &__new_blocked, &__old_blocked);         \
 543         __ret = wait_event_interruptible(wq, condition);                \
 544         sigprocmask(SIG_SETMASK, &__old_blocked, NULL);                 \
 545         __ret;                                                          \
 546 })
 547
 548 #define l_wait_event_abortable_timeout(wq, condition, timeout)          \
 549 ({                                                                      \
 550         sigset_t __new_blocked, __old_blocked;                          \
 551         int __ret = 0;                                                  \
 552         siginitsetinv(&__new_blocked, LUSTRE_FATAL_SIGS);               \
 553         sigprocmask(SIG_BLOCK, &__new_blocked, &__old_blocked);         \
 554         __ret = wait_event_interruptible_timeout(wq, condition, timeout);\
 555         sigprocmask(SIG_SETMASK, &__old_blocked, NULL);                 \
 556         __ret;                                                          \
 557 })
 558
 559 #define l_wait_event_abortable_exclusive(wq, condition)                 \
 560 ({                                                                      \
 561         sigset_t __new_blocked, __old_blocked;                          \
 562         int __ret = 0;                                                  \
 563         siginitsetinv(&__new_blocked, LUSTRE_FATAL_SIGS);               \
 564         sigprocmask(SIG_BLOCK, &__new_blocked, &__old_blocked);         \
 565         __ret = wait_event_interruptible_exclusive(wq, condition);      \
 566         sigprocmask(SIG_SETMASK, &__old_blocked, NULL);                 \
 567         __ret;                                                          \
 568 })
 569
 570 #endif /* __LICBFS_LINUX_WAIT_BIT_H */