libcfs/autoconf/lustre-libcfs.m4

   1 #
   2 # LIBCFS_CONFIG_CDEBUG
   3 #
   4 # whether to enable various libcfs debugs (CDEBUG, ENTRY/EXIT, LASSERT, etc.)
   5 #
   6 AC_DEFUN([LIBCFS_CONFIG_CDEBUG], [
   7 AC_MSG_CHECKING([whether to enable CDEBUG, CWARN])
   8 AC_ARG_ENABLE([libcfs_cdebug],
   9         AC_HELP_STRING([--disable-libcfs-cdebug],
  10                 [disable libcfs CDEBUG, CWARN]),
  11         [], [enable_libcfs_cdebug="yes"])
  12 AC_MSG_RESULT([$enable_libcfs_cdebug])
  13 AS_IF([test "x$enable_libcfs_cdebug" = xyes],
  14         [AC_DEFINE(CDEBUG_ENABLED, 1, [enable libcfs CDEBUG, CWARN])])
  15
  16 AC_MSG_CHECKING([whether to enable ENTRY/EXIT])
  17 AC_ARG_ENABLE([libcfs_trace],
  18         AC_HELP_STRING([--disable-libcfs-trace],
  19                 [disable libcfs ENTRY/EXIT]),
  20         [], [enable_libcfs_trace="yes"])
  21 AC_MSG_RESULT([$enable_libcfs_trace])
  22 AS_IF([test "x$enable_libcfs_trace" = xyes],
  23         [AC_DEFINE(CDEBUG_ENTRY_EXIT, 1, [enable libcfs ENTRY/EXIT])])
  24
  25 AC_MSG_CHECKING([whether to enable LASSERT, LASSERTF])
  26 AC_ARG_ENABLE([libcfs_assert],
  27         AC_HELP_STRING([--disable-libcfs-assert],
  28                 [disable libcfs LASSERT, LASSERTF]),
  29         [], [enable_libcfs_assert="yes"])
  30 AC_MSG_RESULT([$enable_libcfs_assert])
  31 AS_IF([test x$enable_libcfs_assert = xyes],
  32         [AC_DEFINE(LIBCFS_DEBUG, 1, [enable libcfs LASSERT, LASSERTF])])
  33 ]) # LIBCFS_CONFIG_CDEBUG
  34
  35 #
  36 # LIBCFS_CONFIG_PANIC_DUMPLOG
  37 #
  38 # check if tunable panic_dumplog is wanted
  39 #
  40 AC_DEFUN([LIBCFS_CONFIG_PANIC_DUMPLOG], [
  41 AC_MSG_CHECKING([whether to use tunable 'panic_dumplog' support])
  42 AC_ARG_ENABLE([panic_dumplog],
  43         AC_HELP_STRING([--enable-panic_dumplog],
  44                 [enable panic_dumplog]),
  45         [], [enable_panic_dumplog="no"])
  46 AC_MSG_RESULT([$enable_panic_dumplog])
  47 AS_IF([test "x$enable_panic_dumplog" = xyes],
  48         [AC_DEFINE(LNET_DUMP_ON_PANIC, 1, [use dumplog on panic])])
  49 ]) # LIBCFS_CONFIG_PANIC_DUMPLOG
  50
  51 #
  52 # Kernel version 3.11 introduced ktime_get_ts64
  53 #
  54 AC_DEFUN([LIBCFS_KTIME_GET_TS64],[
  55 LB_CHECK_COMPILE([does function 'ktime_get_ts64' exist],
  56 ktime_get_ts64, [
  57         #include <linux/hrtimer.h>
  58         #include <linux/ktime.h>
  59 ],[
  60         struct timespec64 *ts = NULL;
  61
  62         ktime_get_ts64(ts);
  63 ],[
  64         AC_DEFINE(HAVE_KTIME_GET_TS64, 1,
  65                 ['ktime_get_ts64' is available])
  66 ])
  67 ]) # LIBCFS_KTIME_GET_TS64
  68
  69 #
  70 # Kernel version 3.12-rc4 commit c2d816443ef30 added prepare_to_wait_event()
  71 #
  72 AC_DEFUN([LIBCFS_PREPARE_TO_WAIT_EVENT],[
  73 LB_CHECK_COMPILE([does function 'prepare_to_wait_event' exist],
  74 prepare_to_wait_event, [
  75         #include <linux/wait.h>
  76 ],[
  77         prepare_to_wait_event(NULL, NULL, 0);
  78 ],[
  79         AC_DEFINE(HAVE_PREPARE_TO_WAIT_EVENT, 1,
  80                 ['prepare_to_wait_event' is available])
  81 ])
  82 ]) # LIBCFS_PREPARE_TO_WAIT_EVENT
  83
  84 #
  85 # Linux kernel 3.12 introduced struct kernel_param_ops
  86 # This has been backported to all lustre supported
  87 # clients except RHEL6. We have to handle the differences.
  88 #
  89 AC_DEFUN([LIBCFS_KERNEL_PARAM_OPS],[
  90 LB_CHECK_COMPILE([does 'struct kernel_param_ops' exist],
  91 kernel_param_ops, [
  92         #include <linux/module.h>
  93 ],[
  94         struct kernel_param_ops ops;
  95
  96         ops.set = NULL;
  97 ],[
  98         AC_DEFINE(HAVE_KERNEL_PARAM_OPS, 1,
  99                 ['struct kernel_param_ops' is available])
 100 ])
 101 ]) # LIBCFS_KERNEL_PARAM_OPS
 102
 103 #
 104 # Kernel version 3.12 introduced ktime_add
 105 #
 106 AC_DEFUN([LIBCFS_KTIME_ADD],[
 107 LB_CHECK_COMPILE([does function 'ktime_add' exist],
 108 ktime_add, [
 109         #include <linux/hrtimer.h>
 110         #include <linux/ktime.h>
 111 ],[
 112         ktime_t start = ktime_set(0, 0);
 113         ktime_t end = start;
 114         ktime_t total;
 115
 116         total = ktime_add(start, end);
 117 ],[
 118         AC_DEFINE(HAVE_KTIME_ADD, 1,
 119                 [ktime_add is available])
 120 ])
 121 ]) # LIBCFS_KTIME_ADD
 122
 123 #
 124 # Kernel version 3.12 introduced ktime_after
 125 #
 126 AC_DEFUN([LIBCFS_KTIME_AFTER],[
 127 LB_CHECK_COMPILE([does function 'ktime_after' exist],
 128 ktime_after, [
 129         #include <linux/hrtimer.h>
 130         #include <linux/ktime.h>
 131 ],[
 132         ktime_t start = ktime_set(0, 0);
 133         ktime_t end = start;
 134
 135         ktime_after(start, end);
 136 ],[
 137         AC_DEFINE(HAVE_KTIME_AFTER, 1,
 138                 [ktime_after is available])
 139 ])
 140 ]) # LIBCFS_KTIME_AFTER
 141
 142 #
 143 # Kernel version 3.12 introduced ktime_before
 144 # See linux commit 67cb9366ff5f99868100198efba5ca88aaa6ad25
 145 #
 146 AC_DEFUN([LIBCFS_KTIME_BEFORE],[
 147 LB_CHECK_COMPILE([does function 'ktime_before' exist],
 148 ktime_before, [
 149         #include <linux/hrtimer.h>
 150         #include <linux/ktime.h>
 151 ],[
 152         ktime_t start = ktime_set(0, 0);
 153         ktime_t end = start;
 154
 155         ktime_before(start, end);
 156 ],[
 157         AC_DEFINE(HAVE_KTIME_BEFORE, 1,
 158                 [ktime_before is available])
 159 ])
 160 ]) # LIBCFS_KTIME_BEFORE
 161
 162 #
 163 # Kernel version 3.12 introduced ktime_compare
 164 #
 165 AC_DEFUN([LIBCFS_KTIME_COMPARE],[
 166 LB_CHECK_COMPILE([does function 'ktime_compare' exist],
 167 ktime_compare, [
 168         #include <linux/hrtimer.h>
 169         #include <linux/ktime.h>
 170 ],[
 171         ktime_t start = ktime_set(0, 0);
 172         ktime_t end = start;
 173
 174         ktime_compare(start, end);
 175 ],[
 176         AC_DEFINE(HAVE_KTIME_COMPARE, 1,
 177                 [ktime_compare is available])
 178 ])
 179 ]) # LIBCFS_KTIME_COMPARE
 180
 181 #
 182 # FC19 3.12 kernel struct shrinker change
 183 #
 184 AC_DEFUN([LIBCFS_SHRINKER_COUNT],[
 185 LB_CHECK_COMPILE([shrinker has 'count_objects'],
 186 shrinker_count_objects, [
 187         #include <linux/mmzone.h>
 188         #include <linux/shrinker.h>
 189 ],[
 190         struct shrinker shrinker;
 191
 192         shrinker.count_objects = NULL;
 193 ],[
 194         AC_DEFINE(HAVE_SHRINKER_COUNT, 1,
 195                 [shrinker has count_objects member])
 196 ])
 197 ]) # LIBCFS_SHRINKER_COUNT
 198
 199 #
 200 # Kernel version 3.13 commit aace05097a0fd467230e39acb148be0fdaa90068
 201 # add match_wildcard() function.
 202 #
 203 AC_DEFUN([LIBCFS_MATCH_WILDCARD],[
 204 LB_CHECK_COMPILE([does function 'match_wildcard' exist],
 205 match_wildcard, [
 206         #include <linux/parser.h>
 207 ],[
 208         bool match;
 209
 210         match = match_wildcard(NULL, NULL);
 211 ],[
 212         AC_DEFINE(HAVE_MATCH_WILDCARD, 1,
 213                 [match_wildcard() is available])
 214 ])
 215 ]) # LIBCFS_MATCH_WILDCARD
 216
 217 #
 218 # LIBCFS_HAVE_MAPPING_AS_EXITING_FLAG
 219 #
 220 # v3.14-7405-g91b0abe36a7b added AS_EXITING flag with
 221 # mapping_exiting() and mapping_set_exiting()
 222 #
 223 AC_DEFUN([LIBCFS_HAVE_MAPPING_AS_EXITING_FLAG], [
 224 m4_pattern_allow([AS_EXITING])
 225 tmp_flags="$EXTRA_KCFLAGS"
 226 EXTRA_KCFLAGS="-Werror"
 227 LB_CHECK_COMPILE([if enum mapping_flags has AS_EXITING flag],
 228 mapping_exiting_exists, [
 229         #include <linux/pagemap.h>
 230 ],[
 231         enum mapping_flags flag = AS_EXITING;
 232         (void)flag;
 233 ],[
 234         AC_DEFINE(HAVE_MAPPING_AS_EXITING_FLAG, 1,
 235                 [enum mapping_flags has AS_EXITING flag])
 236 ])
 237 EXTRA_KCFLAGS="$tmp_flags"
 238 ]) # LIBCFS_HAVE_MAPPING_AS_EXITING_FLAG
 239
 240 #
 241 # LIBCFS_IOV_ITER_HAS_TYPE
 242 #
 243 # kernel 3.15-rc4 commit 71d8e532b1549a478e6a6a8a44f309d050294d00
 244 # start adding the tag to iov_iter
 245 #
 246 AC_DEFUN([LIBCFS_IOV_ITER_HAS_TYPE], [
 247 tmp_flags="$EXTRA_KCFLAGS"
 248 EXTRA_KCFLAGS="-Werror"
 249 LB_CHECK_COMPILE([if iov_iter has member type],
 250 iov_iter_has_type_member, [
 251         #include <linux/uio.h>
 252 ],[
 253         struct iov_iter iter = { .type = ITER_KVEC };
 254         (void)iter;
 255 ],[
 256         AC_DEFINE(HAVE_IOV_ITER_HAS_TYPE_MEMBER, 1,
 257                 [if iov_iter has member type])
 258 ])
 259 EXTRA_KCFLAGS="$tmp_flags"
 260 ]) # LIBCFS_IOV_ITER_HAS_TYPE
 261
 262 #
 263 # LIBCFS_HAVE_NS_TO_TIMESPEC64
 264 #
 265 # Kernel version 3.16-rc3 commit a84d1169164b274f13b97a23ff235c000efe3b49
 266 # introduced struct __kernel_old_timeval
 267 #
 268 AC_DEFUN([LIBCFS_HAVE_NS_TO_TIMESPEC64],[
 269 LB_CHECK_COMPILE([does 'ns_to_timespec64()' exist],
 270 kernel_old_timeval, [
 271         #include <linux/time.h>
 272 ],[
 273         struct timespec64 kts;
 274
 275         kts = ns_to_timespec64(0);
 276 ],[
 277         AC_DEFINE(HAVE_NS_TO_TIMESPEC64, 1,
 278                 [ns_to_timespec64() is available])
 279 ])
 280 ]) # LIBCFS_HAVE_NS_TO_TIMESPEC64
 281
 282 #
 283 # LIBCFS_HAVE_GLOB
 284 #
 285 # Kernel version 3.16 commit b01250856b25f4417c51aa33afc451fbf7da1484
 286 # added glob support to the Linux kernel
 287 #
 288 AC_DEFUN([LIBCFS_HAVE_GLOB],[
 289 tmp_flags="$EXTRA_KCFLAGS"
 290 EXTRA_KCFLAGS="-Werror"
 291 LB_CHECK_COMPILE([does 'glob_match()' exist],
 292 glob, [
 293         #include <linux/glob.h>
 294 ],[
 295         return glob_match(NULL, NULL);
 296 ],[
 297         AC_DEFINE(HAVE_GLOB, 1,
 298                 [glob_match() is available])
 299 ])
 300 EXTRA_KCFLAGS="$tmp_flags"
 301 ]) # LIBCFS_HAVE_GLOB
 302
 303 #
 304 # Kernel version 3.17 changed hlist_add_after to
 305 # hlist_add_behind
 306 #
 307 AC_DEFUN([LIBCFS_HLIST_ADD_AFTER],[
 308 LB_CHECK_COMPILE([does function 'hlist_add_after' exist],
 309 hlist_add_after, [
 310         #include <linux/list.h>
 311 ],[
 312         hlist_add_after(NULL, NULL);
 313 ],[
 314         AC_DEFINE(HAVE_HLIST_ADD_AFTER, 1,
 315                 [hlist_add_after is available])
 316 ])
 317 ]) # LIBCFS_HLIST_ADD_AFTER
 318
 319 #
 320 # Kernel version 3.17 introduced struct timespec64
 321 #
 322 AC_DEFUN([LIBCFS_TIMESPEC64],[
 323 LB_CHECK_COMPILE([does 'struct timespec64' exist],
 324 timespec64, [
 325         #include <linux/time.h>
 326 ],[
 327         struct timespec64 ts;
 328
 329         ts.tv_sec = 0;
 330         ts.tv_nsec = 0;
 331 ],[
 332         AC_DEFINE(HAVE_TIMESPEC64, 1,
 333                 ['struct timespec64' is available])
 334 ])
 335 ]) # LIBCFS_TIMESPEC64
 336
 337 #
 338 # Kernel version 3.17 introduced ktime_get_real_ts64
 339 #
 340 AC_DEFUN([LIBCFS_KTIME_GET_REAL_TS64],[
 341 LB_CHECK_COMPILE([does function 'ktime_get_real_ts64' exist],
 342 ktime_get_real_ts64, [
 343         #include <linux/ktime.h>
 344 ],[
 345         struct timespec64 *ts = NULL;
 346
 347         ktime_get_real_ts64(ts);
 348 ],[
 349         AC_DEFINE(HAVE_KTIME_GET_REAL_TS64, 1,
 350                 ['ktime_get_real_ts64' is available])
 351 ])
 352 ]) # LIBCFS_KTIME_GET_REAL_TS64
 353
 354 #
 355 # Kernel version 3.17 introduced ktime_get_real_seconds
 356 #
 357 AC_DEFUN([LIBCFS_KTIME_GET_REAL_SECONDS],[
 358 LB_CHECK_COMPILE([does function 'ktime_get_real_seconds' exist],
 359 ktime_get_real_seconds, [
 360         #include <linux/hrtimer.h>
 361         #include <linux/ktime.h>
 362 ],[
 363         time64_t now;
 364
 365         now = ktime_get_real_seconds();
 366 ],[
 367         AC_DEFINE(HAVE_KTIME_GET_REAL_SECONDS, 1,
 368                 ['ktime_get_real_seconds' is available])
 369 ])
 370 ]) # LIBCFS_KTIME_GET_REAL_SECONDS
 371
 372 #
 373 # Kernel version 3.17 created ktime_get_ns wrapper
 374 #
 375 AC_DEFUN([LIBCFS_KTIME_GET_NS],[
 376 LB_CHECK_COMPILE([does function 'ktime_get_ns' exist],
 377 ktime_get_ns, [
 378         #include <linux/hrtimer.h>
 379         #include <linux/ktime.h>
 380 ],[
 381         u64 nanoseconds;
 382
 383         nanoseconds = ktime_get_ns();
 384 ],[],[
 385         AC_DEFINE(NEED_KTIME_GET_NS, 1,
 386                 ['ktime_get_ns' is not available])
 387 ])
 388 ]) # LIBCFS_KTIME_GET_NS
 389
 390 #
 391 # Kernel version 3.17 created ktime_get_real_ns wrapper
 392 #
 393 AC_DEFUN([LIBCFS_KTIME_GET_REAL_NS],[
 394 LB_CHECK_COMPILE([does function 'ktime_get_real_ns' exist],
 395 ktime_get_real_ns, [
 396         #include <linux/hrtimer.h>
 397         #include <linux/ktime.h>
 398 ],[
 399         u64 nanoseconds;
 400
 401         nanoseconds = ktime_get_real_ns();
 402 ],[],[
 403         AC_DEFINE(NEED_KTIME_GET_REAL_NS, 1,
 404                 ['ktime_get_real_ns' is not available])
 405 ])
 406 ]) # LIBCFS_KTIME_GET_REAL_NS
 407
 408 #
 409 # Kernel version 3.17 introduced ktime_to_timespec64
 410 #
 411 AC_DEFUN([LIBCFS_KTIME_TO_TIMESPEC64],[
 412 LB_CHECK_COMPILE([does function 'ktime_to_timespec64' exist],
 413 ktime_to_timespec64, [
 414         #include <linux/hrtimer.h>
 415         #include <linux/ktime.h>
 416 ],[
 417         ktime_t now = ktime_set(0, 0);
 418         struct timespec64 ts;
 419
 420         ts = ktime_to_timespec64(now);
 421 ],[
 422         AC_DEFINE(HAVE_KTIME_TO_TIMESPEC64, 1,
 423                 ['ktime_to_timespec64' is available])
 424 ])
 425 ]) # LIBCFS_KTIME_TO_TIMESPEC64
 426
 427 #
 428 # Kernel version 3.17 introduced timespec64_sub
 429 #
 430 AC_DEFUN([LIBCFS_TIMESPEC64_SUB],[
 431 LB_CHECK_COMPILE([does function 'timespec64_sub' exist],
 432 timespec64_sub, [
 433         #include <linux/time.h>
 434 ],[
 435         struct timespec64 later = { }, earlier = { }, diff;
 436
 437         diff = timespec64_sub(later, earlier);
 438 ],[
 439         AC_DEFINE(HAVE_TIMESPEC64_SUB, 1,
 440                 ['timespec64_sub' is available])
 441 ])
 442 ]) # LIBCFS_TIMESPEC64_SUB
 443
 444 #
 445 # Kernel version 3.17 introduced timespec64_to_ktime
 446 #
 447 AC_DEFUN([LIBCFS_TIMESPEC64_TO_KTIME],[
 448 LB_CHECK_COMPILE([does function 'timespec64_to_ktime' exist],
 449 timespec64_to_ktime, [
 450         #include <linux/ktime.h>
 451 ],[
 452         struct timespec64 ts;
 453         ktime_t now;
 454
 455         now = timespec64_to_ktime(ts);
 456 ],[
 457         AC_DEFINE(HAVE_TIMESPEC64_TO_KTIME, 1,
 458                 ['timespec64_to_ktime' is available])
 459 ])
 460 ]) # LIBCFS_TIMESPEC64_TO_KTIME
 461
 462 #
 463 # Kernel version 3.19 introduced ktime_get_seconds
 464 #
 465 AC_DEFUN([LIBCFS_KTIME_GET_SECONDS],[
 466 LB_CHECK_COMPILE([does function 'ktime_get_seconds' exist],
 467 ktime_get_seconds, [
 468         #include <linux/ktime.h>
 469 ],[
 470         time64_t now;
 471
 472         now = ktime_get_seconds();
 473 ],[
 474         AC_DEFINE(HAVE_KTIME_GET_SECONDS, 1,
 475                 ['ktime_get_seconds' is available])
 476 ])
 477 ]) # LIBCFS_KTIME_GET_SECONDS
 478
 479 #
 480 # Kernel version 3.19 commit v3.18-rc2-26-g61ada528dea0
 481 # introduce wait_woken()
 482 #
 483 AC_DEFUN([LIBCFS_WAIT_WOKEN],[
 484 LB_CHECK_COMPILE([does function 'wait_woken' exist],
 485 wait_woken, [
 486         #include <linux/wait.h>
 487 ],[
 488         wait_woken(NULL, 0, 0);
 489 ],[
 490         AC_DEFINE(HAVE_WAIT_WOKEN, 1,
 491                 ['wait_woken, is available'])
 492 ])
 493 ]) # LIBCFS_WAIT_WOKEN
 494
 495 #
 496 # Kernel version 4.0 commit 41fbf3b39d5eca01527338b4d0ee15ee1ae1023c
 497 # introduced the helper function ktime_ms_delta.
 498 #
 499 AC_DEFUN([LIBCFS_KTIME_MS_DELTA],[
 500 LB_CHECK_COMPILE([does function 'ktime_ms_delta' exist],
 501 ktime_ms_delta, [
 502         #include <linux/ktime.h>
 503 ],[
 504         ktime_t start = ktime_set(0, 0);
 505         ktime_t end = start;
 506
 507         ktime_ms_delta(start, end);
 508 ],[
 509         AC_DEFINE(HAVE_KTIME_MS_DELTA, 1,
 510                 ['ktime_ms_delta' is available])
 511 ])
 512 ]) # LIBCFS_KTIME_MS_DELTA
 513
 514 #
 515 # Kernel version 4.1 commit b51d23e4e9fea6f264d39535c2a62d1f51e7ccc3
 516 # create per module locks which added kernel_param_[un]lock(). Older
 517 # kernels you have to use __kernel_param_[un]lock(). In that case its
 518 # a global lock for all modules but that is okay since its a rare event.
 519 #
 520 AC_DEFUN([LIBCFS_KERNEL_PARAM_LOCK],[
 521 LB_CHECK_COMPILE([does function 'kernel_param_[un]lock' exist],
 522 kernel_param_lock, [
 523         #include <linux/moduleparam.h>
 524 ],[
 525         kernel_param_lock(NULL);
 526         kernel_param_unlock(NULL);
 527 ],[
 528         AC_DEFINE(HAVE_KERNEL_PARAM_LOCK, 1,
 529                 ['kernel_param_[un]lock' is available])
 530 ])
 531 ]) # LIBCFS_KERNEL_PARAM_LOCK
 532
 533 #
 534 # Kernel version 4.2 changed topology_thread_cpumask
 535 # to topology_sibling_cpumask
 536 #
 537 AC_DEFUN([LIBCFS_HAVE_TOPOLOGY_SIBLING_CPUMASK],[
 538 LB_CHECK_COMPILE([does function 'topology_sibling_cpumask' exist],
 539 topology_sibling_cpumask, [
 540         #include <linux/topology.h>
 541 ],[
 542         const struct cpumask *mask;
 543
 544         mask = topology_sibling_cpumask(0);
 545 ],[
 546         AC_DEFINE(HAVE_TOPOLOGY_SIBLING_CPUMASK, 1,
 547                 [topology_sibling_cpumask is available])
 548 ])
 549 ]) # LIBCFS_HAVE_TOPOLOGY_SIBLING_CPUMASK
 550
 551 #
 552 # Kernel version 4.4 commit ef951599074ba4fad2d0efa0a977129b41e6d203
 553 # introduced kstrtobool and kstrtobool_from_user.
 554 #
 555 AC_DEFUN([LIBCFS_KSTRTOBOOL_FROM_USER], [
 556 LB_CHECK_COMPILE([if Linux kernel has 'kstrtobool_from_user'],
 557 kstrtobool_from_user, [
 558         #include <linux/kernel.h>
 559 ],[
 560         bool result;
 561         return kstrtobool_from_user(NULL, 0, &result);
 562 ],[
 563         AC_DEFINE(HAVE_KSTRTOBOOL_FROM_USER, 1,
 564                 [kernel has kstrtobool_from_user])
 565 ])
 566 ]) # LIBCFS_KSTRTOBOOL_FROM_USER
 567
 568 #
 569 # LIBCFS_NETLINK_CALLBACK_START
 570 #
 571 # Kernel version 4.4-rc3 commit fc9e50f5a5a4e1fa9ba2756f745a13e693cf6a06
 572 # added a start function callback for struct netlink_callback
 573 #
 574 AC_DEFUN([LIBCFS_NETLINK_CALLBACK_START], [
 575 LB_CHECK_COMPILE([if struct genl_ops has start callback],
 576 cb_start, [
 577         #include <net/genetlink.h>
 578 ],[
 579         struct genl_ops ops;
 580
 581         ops.start = NULL;
 582 ],[
 583         AC_DEFINE(HAVE_NETLINK_CALLBACK_START, 1,
 584                 [struct genl_ops has 'start' callback])
 585 ])
 586 ]) # LIBCFS_NETLINK_CALLBACK_START
 587
 588 #
 589 # Kernel version 4.5-rc1 commit d12481bc58fba89427565f8592e88446ec084a24
 590 # added crypto hash helpers
 591 #
 592 AC_DEFUN([LIBCFS_CRYPTO_HASH_HELPERS], [
 593 LB_CHECK_COMPILE([does crypto hash helper functions exist],
 594 crypto_hash_helpers, [
 595         #include <crypto/hash.h>
 596 ],[
 597         crypto_ahash_alg_name(NULL);
 598         crypto_ahash_driver_name(NULL);
 599 ],[
 600         AC_DEFINE(HAVE_CRYPTO_HASH_HELPERS, 1,
 601                 [crypto hash helper functions are available])
 602 ])
 603 ]) # LIBCFS_CRYPTO_HASH_HELPERS
 604
 605 #
 606 # Kernel version 4.5-rc1 commit 3502cad73c4bbf8f6365d539e814159275252c59
 607 # introduced rhashtable_replace_fast
 608 #
 609 AC_DEFUN([LIBCFS_RHASHTABLE_REPLACE], [
 610 LB_CHECK_COMPILE([if 'rhashtable_replace_fast' exists],
 611 rhashtable_replace_fast, [
 612         #include <linux/rhashtable.h>
 613 ],[
 614         const struct rhashtable_params params = { 0 };
 615
 616         rhashtable_replace_fast(NULL, NULL, NULL, params);
 617 ],[
 618         AC_DEFINE(HAVE_RHASHTABLE_REPLACE, 1,
 619                 [rhashtable_replace_fast() is available])
 620 ])
 621 ]) # LIBCFS_RHASHTABLE_REPLACE
 622
 623 #
 624 # Kernel version 4.5-rc3 commit 2fe829aca9d7bed5fd6b49c6a1452e5e486b6cc3dd
 625 # made kset_find_obj() exportable to modules
 626 #
 627 AC_DEFUN([LIBCFS_EXPORT_KSET_FIND_OBJ], [
 628 LB_CHECK_EXPORT([kset_find_obj], [lib/kobject.c],
 629         [AC_DEFINE(HAVE_KSET_FIND_OBJ, 1,
 630                 [kset_find_obj is exported by the kernel])])
 631 ]) # LIBCFS_EXPORT_KSET_FIND_OBJ
 632
 633 #
 634 # Kernel version 4.6+ commit ef703f49a6c5b909a85149bb6625c4ed0d697186
 635 # fixed the brokenness of hash_64(). The fix removed GOLDEN_RATIO_PRIME_64
 636 # since it was a poor prime value.
 637 #
 638 AC_DEFUN([LIBCFS_BROKEN_HASH_64], [
 639 LB_CHECK_COMPILE([kernel has fixed hash_64()],
 640 broken_hash_64, [
 641         #include <linux/hash.h>
 642 ],[
 643         int tmp = GOLDEN_RATIO_PRIME_64;
 644 ],[
 645         AC_DEFINE(HAVE_BROKEN_HASH_64, 1, [kernel hash_64() is broken])
 646 ])
 647 ]) # LIBCFS_BROKEN_HASH_64
 648
 649 #
 650 # LIBCFS_STACKTRACE_OPS_ADDRESS_RETURN_INT
 651 #
 652 # linux 4.6 kernel changed stacktrace_ops address to return an int
 653 #
 654 AC_DEFUN([LIBCFS_STACKTRACE_OPS_ADDRESS_RETURN_INT], [
 655 LB_CHECK_COMPILE([if 'struct stacktrace_ops' address function returns an int],
 656 stacktrace_ops_address_return_int, [
 657         #include <asm/stacktrace.h>
 658 ],[
 659         int rc;
 660
 661         rc = ((struct stacktrace_ops *)0)->address(NULL, 0, 0);
 662 ],[
 663         AC_DEFINE(STACKTRACE_OPS_ADDRESS_RETURN_INT, 1,
 664                 ['struct stacktrace_ops' address function returns an int])
 665 ])
 666 ]) # LIBCFS_STACKTRACE_OPS_ADDRESS_RETURN_INT
 667
 668 #
 669 # Kernel version 4.6 removed both struct task_struct and struct mm_struct
 670 # arguments to get_user_pages
 671 #
 672 AC_DEFUN([LIBCFS_GET_USER_PAGES_6ARG], [
 673 LB_CHECK_COMPILE([if 'get_user_pages()' takes 6 arguments],
 674 get_user_pages_6arg, [
 675         #include <linux/mm.h>
 676 ],[
 677         int rc;
 678
 679         rc = get_user_pages(0, 0, 0, 0, NULL, NULL);
 680 ],[
 681         AC_DEFINE(HAVE_GET_USER_PAGES_6ARG, 1,
 682                 [get_user_pages takes 6 arguments])
 683 ])
 684 ]) # LIBCFS_GET_USER_PAGES_6ARG
 685
 686 #
 687 # LIBCFS_STRINGHASH
 688 #
 689 # 4.6 kernel created stringhash.h which moved stuff out of dcache.h
 690 # commit f4bcbe792b8f434e32487cff9d9e30ab45a3ce02
 691 #
 692 AC_DEFUN([LIBCFS_STRINGHASH], [
 693 LB_CHECK_LINUX_HEADER([linux/stringhash.h], [
 694         AC_DEFINE(HAVE_STRINGHASH, 1,
 695                 [stringhash.h is present])])
 696 ]) # LIBCFS_STRINGHASH
 697
 698 #
 699 # LIBCFS_RHASHTABLE_INSERT_FAST
 700 #
 701 # 4.7+ kernel commit 5ca8cc5bf11faed257c762018aea9106d529232f
 702 # changed __rhashtable_insert_fast to support the new function
 703 # rhashtable_lookup_get_insert_key().
 704 #
 705 AC_DEFUN([LIBCFS_RHASHTABLE_INSERT_FAST], [
 706 tmp_flags="$EXTRA_KCFLAGS"
 707 EXTRA_KCFLAGS="-Werror"
 708 LB_CHECK_COMPILE([if internal '__rhashtable_insert_fast()' returns int],
 709 rhashtable_insert_fast, [
 710         #include <linux/rhashtable.h>
 711 ],[
 712         const struct rhashtable_params params = { 0 };
 713         int rc;
 714
 715         rc = __rhashtable_insert_fast(NULL, NULL, NULL, params);
 716 ],[
 717         AC_DEFINE(HAVE_HASHTABLE_INSERT_FAST_RETURN_INT, 1,
 718                   ['__rhashtable_insert_fast()' returns int])
 719 ])
 720 EXTRA_KCFLAGS="$tmp_flags"
 721 ]) # LIBCFS_RHASHTABLE_INSERT_FAST
 722
 723 #
 724 # Kernel version 4.7-rc1 commit 8f6fd83c6c5ec66a4a70c728535ddcdfef4f3697
 725 # added 3rd arg to rhashtable_walk_init
 726 #
 727 AC_DEFUN([LIBCFS_RHASHTABLE_WALK_INIT_3ARG], [
 728 LB_CHECK_COMPILE([if 'rhashtable_walk_init' has 3 args],
 729 rhashtable_walk_init, [
 730         #include <linux/gfp.h>
 731         #include <linux/rhashtable.h>
 732 ],[
 733         rhashtable_walk_init(NULL, NULL, GFP_KERNEL);
 734 ],[
 735         AC_DEFINE(HAVE_3ARG_RHASHTABLE_WALK_INIT, 1,
 736                 [rhashtable_walk_init() has 3 args])
 737 ])
 738 ]) # LIBCFS_RHASHTABLE_WALK_INIT_3ARG
 739
 740 #
 741 # Kernel version 4.8-rc6 commit ca26893f05e86497a86732768ec53cd38c0819ca
 742 # introduced rhashtable_lookup
 743 #
 744 AC_DEFUN([LIBCFS_RHASHTABLE_LOOKUP], [
 745 LB_CHECK_COMPILE([if 'rhashtable_lookup' exist],
 746 rhashtable_lookup, [
 747         #include <linux/rhashtable.h>
 748 ],[
 749         const struct rhashtable_params params = { 0 };
 750         void *ret;
 751
 752         ret = rhashtable_lookup(NULL, NULL, params);
 753 ],[
 754         AC_DEFINE(HAVE_RHASHTABLE_LOOKUP, 1,
 755                 [rhashtable_lookup() is available])
 756 ])
 757 ]) # LIBCFS_RHASHTABLE_LOOKUP
 758
 759 #
 760 # LIBCFS_RHLTABLE
 761 # Kernel version 4.8-rc6 commit ca26893f05e86497a86732768ec53cd38c0819ca
 762 # created the rhlist interface to allow inserting duplicate objects
 763 # into the same table.
 764 #
 765 AC_DEFUN([LIBCFS_RHLTABLE], [
 766 LB_CHECK_COMPILE([does 'struct rhltable' exist],
 767 rhtable, [
 768         #include <linux/rhashtable.h>
 769 ],[
 770         struct rhltable *hlt;
 771
 772         rhltable_destroy(hlt);
 773 ],[
 774         AC_DEFINE(HAVE_RHLTABLE, 1,
 775                   [struct rhltable exist])
 776 ])
 777 ]) # LIBCFS_RHLTABLE
 778
 779 #
 780 # LIBCFS_STACKTRACE_OPS
 781 #
 782 # Kernel version 4.8 commit c8fe4609827aedc9c4b45de80e7cdc8ccfa8541b
 783 # removed both struct stacktrace_ops and dump_trace() function
 784 #
 785 AC_DEFUN([LIBCFS_STACKTRACE_OPS], [
 786 LB_CHECK_COMPILE([if 'struct stacktrace_ops' exists],
 787 stacktrace_ops, [
 788         struct task_struct;
 789         struct pt_regs;
 790         #include <asm/stacktrace.h>
 791 ],[
 792         struct stacktrace_ops ops;
 793         ops.stack = NULL;
 794 ],[
 795         AC_DEFINE(HAVE_STACKTRACE_OPS, 1,
 796                 [struct stacktrace_ops exists])
 797 ])
 798 ]) # LIBCFS_STACKTRACE_OPS
 799
 800 #
 801 # Kernel version 4.9-rc1 commit 246779dd090bd1b74d2652b3a6ca7759f593b27a
 802 # introduced rhashtable_walk_enter
 803 #
 804 AC_DEFUN([LIBCFS_RHASHTABLE_WALK_ENTER], [
 805 LB_CHECK_COMPILE([if 'rhashtable_walk_enter' exists],
 806 rhashtable_walk_enter, [
 807         #include <linux/rhashtable.h>
 808 ],[
 809         rhashtable_walk_enter(NULL, NULL);
 810 ],[
 811         AC_DEFINE(HAVE_RHASHTABLE_WALK_ENTER, 1,
 812                 [rhashtable_walk_enter() is available])
 813 ])
 814 ]) # LIBCFS_RHASHTABLE_WALK_ENTER
 815
 816 #
 817 # Kernel version 4.9 commit 768ae309a96103ed02eb1e111e838c87854d8b51
 818 # mm: replace get_user_pages() write/force parameters with gup_flags
 819 #
 820 AC_DEFUN([LIBCFS_GET_USER_PAGES_GUP_FLAGS], [
 821 LB_CHECK_COMPILE([if 'get_user_pages()' takes gup_flags in arguments],
 822 get_user_pages_gup_flags, [
 823         #include <linux/mm.h>
 824 ],[
 825         int rc;
 826         rc = get_user_pages(0, 0, FOLL_WRITE, NULL, NULL);
 827 ],[
 828         AC_DEFINE(HAVE_GET_USER_PAGES_GUP_FLAGS, 1,
 829                 [get_user_pages takes gup_flags in arguments])
 830 ])
 831 ]) # LIBCFS_GET_USER_PAGES_GUP_FLAGS
 832
 833 #
 834 # Kernel version 4.10 commit 7b737965b33188bd3dbb44e938535c4006d97fbb
 835 # libcfs: Convert to hotplug state machine
 836 #
 837 AC_DEFUN([LIBCFS_HOTPLUG_STATE_MACHINE], [
 838 LB_CHECK_COMPILE([if libcfs supports CPU hotplug state machine],
 839 cpu_hotplug_state_machine, [
 840         #include <linux/cpuhotplug.h>
 841 ],[
 842         cpuhp_remove_state(CPUHP_LUSTRE_CFS_DEAD);
 843 ],[
 844         AC_DEFINE(HAVE_HOTPLUG_STATE_MACHINE, 1,
 845                 [hotplug state machine is supported])
 846 ])
 847 ]) # LIBCFS_HOTPLUG_STATE_MACHINE
 848
 849 #
 850 # Kernel version 4.10-rc3 commit f405df5de3170c00e5c54f8b7cf4766044a032ba
 851 # introduced refcount_t which is atomic_t plus over flow guards.
 852 #
 853 AC_DEFUN([LIBCFS_REFCOUNT_T], [
 854 tmp_flags="$EXTRA_KCFLAGS"
 855 EXTRA_KCFLAGS="-Werror"
 856 LB_CHECK_LINUX_HEADER([linux/refcount.h], [
 857         AC_DEFINE(HAVE_REFCOUNT_T, 1,
 858                 [refcount_t is supported])
 859 ])
 860 EXTRA_KCFLAGS="$tmp_flags"
 861 ]) # LIBCFS_REFCOUNT_T
 862
 863 #
 864 # Kernel version 4.12 commit 499118e966f1d2150bd66647c8932343c4e9a0b8
 865 # introduce memalloc_noreclaim_{save,restore}
 866 #
 867 AC_DEFUN([LIBCFS_MEMALLOC_NORECLAIM], [
 868 LB_CHECK_COMPILE([if memalloc_noreclaim_{save,restore} exist],
 869 memalloc_noreclaim, [
 870         #include <linux/sched/mm.h>
 871 ],[
 872         int flag = memalloc_noreclaim_save();
 873         memalloc_noreclaim_restore(flag);
 874 ],[
 875         AC_DEFINE(HAVE_MEMALLOC_RECLAIM, 1,
 876                 [memalloc_noreclaim_{save,restore}() is supported])
 877 ])
 878 ]) # LIBCFS_MEMALLOC_NORECLAIM
 879
 880 #
 881 # LIBCFS_SCHED_HEADERS
 882 #
 883 # 4.11 has broken up sched.h into more headers.
 884 #
 885 AC_DEFUN([LIBCFS_SCHED_HEADERS], [
 886 LB_CHECK_LINUX_HEADER([linux/sched/signal.h], [
 887         AC_DEFINE(HAVE_SCHED_HEADERS, 1,
 888                 [linux/sched header directory exist])])
 889 ]) # LIBCFS_SCHED_HEADERS
 890
 891 #
 892 # Kernel version 4.11-rc1 commit 2c935bc57221cc2edc787c72ea0e2d30cdcd3d5e
 893 # introduce kref_read
 894 #
 895 AC_DEFUN([LIBCFS_KREF_READ], [
 896 LB_CHECK_COMPILE([if 'kref_read' exists],
 897 kref_read, [
 898         #include <linux/kref.h>
 899 ],[
 900         kref_read(NULL);
 901 ],[
 902         AC_DEFINE(HAVE_KREF_READ, 1,
 903                 [kref_read() is available])
 904 ])
 905 ]) # LIBCFS_KREF_READ
 906
 907 #
 908 # Kernel version 4.11-rc1 commit da20420f83ea0fbcf3d03afda08d971ea1d8a356
 909 # introduced rht_bucket_var
 910 #
 911 AC_DEFUN([LIBCFS_RHT_BUCKET_VAR], [
 912 LB_CHECK_COMPILE([if 'rht_bucket_var' exists],
 913 rht_bucket_var, [
 914         #include <linux/rhashtable.h>
 915 ],[
 916
 917         rht_bucket_var(NULL, 0);
 918 ],[
 919         AC_DEFINE(HAVE_RHT_BUCKET_VAR, 1,
 920                 [rht_bucket_var() is available])
 921 ])
 922 ]) # LIBCFS_RHT_BUCKET_VAR
 923
 924 #
 925 # Kernel version 4.11-rc5 commit fceb6435e85298f747fee938415057af837f5a8a
 926 # began the enhanchement of Netlink with extended ACK struct for advanced
 927 # error handling. By commit 7ab606d1609dd6dfeae9c8ad0a8a4e051d831e46 we
 928 # had full support for this new feature.
 929 #
 930 AC_DEFUN([LIBCFS_NL_EXT_ACK], [
 931 LB_CHECK_COMPILE([if Netlink supports netlink_ext_ack],
 932 netlink_ext_ack, [
 933         #include <net/genetlink.h>
 934 ],[
 935         struct genl_info info;
 936
 937         info.extack = NULL;
 938 ],[
 939         AC_DEFINE(HAVE_NL_PARSE_WITH_EXT_ACK, 1,
 940                 [netlink_ext_ack is an argument to nla_parse type function])
 941 ])
 942 ]) # LIBCFS_NL_EXT_ACK
 943
 944 #
 945 # Kernel version 4.11 commit f9fe1c12d126f9887441fa5bb165046f30ddd4b5
 946 # introduced rhashtable_lookup_get_insert_fast
 947 #
 948 AC_DEFUN([LIBCFS_RHASHTABLE_LOOKUP_GET_INSERT_FAST], [
 949 LB_CHECK_COMPILE([if 'rhashtable_lookup_get_insert_fast' exist],
 950 rhashtable_lookup_get_insert_fast, [
 951         #include <linux/rhashtable.h>
 952 ],[
 953         const struct rhashtable_params params = { 0 };
 954         void *ret;
 955
 956         ret = rhashtable_lookup_get_insert_fast(NULL, NULL, params);
 957 ],[
 958         AC_DEFINE(HAVE_RHASHTABLE_LOOKUP_GET_INSERT_FAST, 1,
 959                 [rhashtable_lookup_get_insert_fast() is available])
 960 ])
 961 ]) # LIBCFS_RHASHTABLE_LOOKUP_GET_INSERT_FAST
 962
 963 #
 964 # Kernel version 4.12-rc2 8f553c498e1772cccb39a114da4a498d22992758
 965 # provide proper CPU hotplug locking
 966 #
 967 AC_DEFUN([LIBCFS_CPUS_READ_LOCK], [
 968 LB_CHECK_COMPILE([if 'cpus_read_[un]lock' exist],
 969 cpu_read_lock, [
 970         #include <linux/cpu.h>
 971 ],[
 972         cpus_read_lock();
 973         cpus_read_unlock();
 974 ],[
 975         AC_DEFINE(HAVE_CPUS_READ_LOCK, 1, ['cpus_read_lock' exist])
 976 ])
 977 ]) # LIBCFS_CPUS_READ_LOCK
 978
 979 #
 980 # Kernel version 4.12-rc3 f9727a17db9bab71ddae91f74f11a8a2f9a0ece6
 981 # renamed uuid_be to uuid_t
 982 #
 983 AC_DEFUN([LIBCFS_UUID_T], [
 984 LB_CHECK_COMPILE([if 'uuid_t' exist],
 985 uuid_t, [
 986         #include <linux/uuid.h>
 987 ],[
 988         uuid_t uuid;
 989
 990         memset(uuid.b, 0, 16);
 991 ],[
 992         AC_DEFINE(HAVE_UUID_T, 1, ['uuid_t' exist])
 993 ])
 994 ]) # LIBCFS_UUID_T
 995
 996 #
 997 # Kernel version 4.12-rc3 commit fd851a3cdc196bfc1d229b5f22369069af532bf8
 998 # introduce processor.h
 999 #
1000 AC_DEFUN([LIBCFS_HAVE_PROCESSOR_HEADER], [
1001 tmp_flags="$EXTRA_KCFLAGS"
1002 EXTRA_KCFLAGS="-Werror"
1003 LB_CHECK_LINUX_HEADER([linux/processor.h], [
1004         AC_DEFINE(HAVE_PROCESSOR_H, 1,
1005                 [processor.h is present])
1006 ])
1007 EXTRA_KCFLAGS="$tmp_flags"
1008 ]) # LIBCFS_HAVE_PROCESSOR_HEADER
1009
1010 #
1011 # Kernel verison 4.12-rc6 commit 5dd43ce2f69d42a71dcacdb13d17d8c0ac1fe8f7
1012 # created wait_bit.h
1013 #
1014 AC_DEFUN([LIBCFS_HAVE_WAIT_BIT_HEADER], [
1015 LB_CHECK_LINUX_HEADER([linux/wait_bit.h], [
1016         AC_DEFINE(HAVE_WAIT_BIT_HEADER_H, 1,
1017                 [wait_bit.h is present])])
1018 ]) # LIBCFS_HAVE_WAIT_BIT_HEADER
1019
1020 #
1021 # Kernel version 4.12-rc6 commmit 2055da97389a605c8a00d163d40903afbe413921
1022 # changed:
1023 #       struct wait_queue_head::task_list       => ::head
1024 #       struct wait_queue_entry::task_list      => ::entry
1025 #
1026 AC_DEFUN([LIBCFS_WAIT_QUEUE_TASK_LIST_RENAME], [
1027 LB_CHECK_COMPILE([if linux wait_queue_head list_head is named head],
1028 wait_queue_task_list, [
1029         #include <linux/wait.h>
1030 ],[
1031         wait_queue_head_t e;
1032
1033         INIT_LIST_HEAD(&e.head);
1034 ],[
1035         AC_DEFINE(HAVE_WAIT_QUEUE_ENTRY_LIST, 1,
1036                 [linux wait_queue_head_t list_head is name head])
1037 ])
1038 ]) # LIBCFS_WAIT_QUEUE_TASK_LIST_RENAME
1039
1040 #
1041 # LIBCFS_WAIT_BIT_QUEUE_ENTRY_EXISTS
1042 #
1043 # Kernel version v4.12-rc6-23-g76c85ddc4695
1044 # sched/wait: Standardize wait_bit_queue naming
1045 #
1046 # renamed struct wait_bit_queue  => wait_bit_queue_entry
1047 #
1048 AC_DEFUN([LIBCFS_WAIT_BIT_QUEUE_ENTRY_EXISTS], [
1049 LB_CHECK_COMPILE([if struct wait_bit_queue_entry exists],
1050 struct_wait_bit_queue_entry_exists, [
1051         #include <linux/wait.h>
1052         #if HAVE_WAIT_BIT_HEADER_H
1053                 #include <linux/wait_bit.h>
1054         #endif
1055 ],[
1056         struct wait_bit_queue_entry entry;
1057         memset(&entry, 0, sizeof(entry));
1058 ],[
1059         AC_DEFINE(HAVE_WAIT_BIT_QUEUE_ENTRY, 1,
1060                 [if struct wait_bit_queue_entry exists])
1061 ])
1062 ]) # LIBCFS_WAIT_BIT_QUEUE_ENTRY_EXISTS
1063
1064 #
1065 # LIBCFS_NLA_STRDUP
1066 #
1067 # Kernel version 4.13-rc1 commit 2cf0c8b3e6942ecafe6ebb1a6d0328a81641bf39
1068 # created nla_strdup(). This is needed since push strings can be
1069 # any size.
1070 #
1071 AC_DEFUN([LIBCFS_NLA_STRDUP], [
1072 LB_CHECK_COMPILE([if 'nla_strdup()' exists],
1073 nla_strdup, [
1074         #include <net/netlink.h>
1075 ],[
1076         char *tmp = nla_strdup(NULL, GFP_KERNEL);
1077 ],[
1078         AC_DEFINE(HAVE_NLA_STRDUP, 1,
1079                 ['nla_strdup' is available])
1080 ])
1081 ]) # LIBCFS_NLA_STRDUP
1082
1083 #
1084 # LIBCFS_WAIT_QUEUE_ENTRY
1085 #
1086 # Kernel version 4.13 ac6424b981bce1c4bc55675c6ce11bfe1bbfa64f
1087 # Rename wait_queue_t => wait_queue_entry_t
1088 #
1089 AC_DEFUN([LIBCFS_WAIT_QUEUE_ENTRY], [
1090 LB_CHECK_COMPILE([if 'wait_queue_entry_t' exists],
1091 wait_queue_entry, [
1092         #include <linux/wait.h>
1093 ],[
1094         wait_queue_entry_t e;
1095
1096         e.flags = 0;
1097 ],[
1098         AC_DEFINE(HAVE_WAIT_QUEUE_ENTRY, 1,
1099                 ['wait_queue_entry_t' is available])
1100 ])
1101 ]) # LIBCFS_WAIT_QUEUE_ENTRY
1102
1103 #
1104 # LIBCFS_NEW_KERNEL_WRITE
1105 #
1106 # Kernel version 4.14 e13ec939e96b13e664bb6cee361cc976a0ee621a
1107 # changed kernel_write prototype to make is plug compatible
1108 # with the unexported vfs_write()
1109 #
1110 AC_DEFUN([LIBCFS_NEW_KERNEL_WRITE], [
1111 tmp_flags="$EXTRA_KCFLAGS"
1112 EXTRA_KCFLAGS="-Werror"
1113 LB_CHECK_COMPILE([if 'kernel_write' matches other read/write helpers],
1114 kernel_write_match, [
1115         #include <linux/fs.h>
1116 ],[
1117         const void *buf = NULL;
1118         loff_t pos = 0;
1119         return kernel_write(NULL, buf, 0, &pos);
1120 ],[
1121         AC_DEFINE(HAVE_NEW_KERNEL_WRITE, 1,
1122                 ['kernel_write' aligns with read/write helpers])
1123 ])
1124 EXTRA_KCFLAGS="$tmp_flags"
1125 ]) # LIBCFS_NEW_KERNEL_WRITE
1126
1127 #
1128 # LIBCFS_MM_TOTALRAM_PAGES_FUNC
1129 #
1130 # kernel 5.0 commit ca79b0c211af63fa3276f0e3fd7dd9ada2439839
1131 # mm: convert totalram_pages and totalhigh_pages variables to atomic
1132 #
1133 AC_DEFUN([LIBCFS_MM_TOTALRAM_PAGES_FUNC], [
1134 tmp_flags="$EXTRA_KCFLAGS"
1135 EXTRA_KCFLAGS="-Werror"
1136 LB_CHECK_COMPILE([if totalram_pages is a function],
1137 totalram_pages, [
1138         #include <linux/mm.h>
1139 ],[
1140         totalram_pages_inc();
1141 ],[
1142         AC_DEFINE(HAVE_TOTALRAM_PAGES_AS_FUNC, 1,
1143                 [if totalram_pages is a function])
1144 ])
1145 EXTRA_KCFLAGS="$tmp_flags"
1146 ]) # LIBCFS_MM_TOTALRAM_PAGES_FUNC
1147
1148 #
1149 # LIBCFS_NEW_KERNEL_READ
1150 #
1151 # 4.14 commit bdd1d2d3d251c65b74ac4493e08db18971c09240 changed
1152 # the signature of kernel_read to match other read/write helpers
1153 # and place offset last.
1154 #
1155 AC_DEFUN([LIBCFS_NEW_KERNEL_READ], [
1156 tmp_flags="$EXTRA_KCFLAGS"
1157 EXTRA_KCFLAGS="-Werror"
1158 LB_CHECK_COMPILE([if 'kernel_read()' has loff_t *pos as last parameter],
1159 kernel_read, [
1160         #include <linux/fs.h>
1161         ],[
1162         loff_t pos = 0;
1163         kernel_read(NULL, NULL, 0, &pos);
1164 ],[
1165         AC_DEFINE(HAVE_KERNEL_READ_LAST_POSP, 1,
1166                 [kernel_read() signature ends with loff_t *pos])
1167 ])
1168 EXTRA_KCFLAGS="$tmp_flags"
1169 ]) # LIBCFS_NEW_KERNEL_READ
1170
1171 #
1172 # LIBCFS_DEFINE_TIMER
1173 #
1174 # Kernel version 4.14 commit 1d27e3e2252ba9d949ca82fbdb73cde102cb2067
1175 # remove expires and data arguments from DEFINE_TIMER. Also the callback
1176 # when from using unsigned long argument to using struct timer_list pointer.
1177 #
1178 AC_DEFUN([LIBCFS_DEFINE_TIMER], [
1179 LB_CHECK_COMPILE([if DEFINE_TIMER takes only 2 arguments],
1180 define_timer, [
1181         #include <linux/timer.h>
1182 ],[
1183         static DEFINE_TIMER(my_timer, NULL);
1184 ],[
1185         AC_DEFINE(HAVE_NEW_DEFINE_TIMER, 1,
1186                 [DEFINE_TIMER uses only 2 arguements])
1187 ])
1188 ]) # LIBCFS_DEFINE_TIMER
1189
1190 #
1191 # LIBCFS_EXPORT_SAVE_STACK_TRACE_TSK
1192 #
1193 # Kernel 2.6.27 commit 8594698ebddeef5443b7da8258ae33b3eaca61d5
1194 # exported save_stack_trace_tsk for x86.
1195 # Kernel 2.6.27 commit 01f4b8b8b8db09b88be7df7e51192e4e678b69d3
1196 # exported save_stack_trace_tsk for powerpc
1197 # Kernel 4.13 commit e27c7fa015d61c8be6a2c32b2144aad2ae6ec975
1198 # exported save_stack_trace_tsk for arm64
1199 # Kernel 4.14 commit 9a3dc3186fc3795e076a4122da9e0258651a9631
1200 # exported save_stack_trace_tsk for arm
1201 #
1202 AC_DEFUN([LIBCFS_EXPORT_SAVE_STACK_TRACE_TSK], [
1203 LB_CHECK_EXPORT([save_stack_trace_tsk], [arch/$SUBARCH/kernel/stacktrace.c],
1204         [AC_DEFINE(HAVE_SAVE_STACK_TRACE_TSK, 1,
1205                 [save_stack_trace_tsk is exported])])
1206 ]) # LIBCFS_EXPORT_SAVE_STACK_TRACE_TSK
1207
1208 #
1209 # LIBCFS_LOCKDEP_IS_HELD
1210 #
1211 # Kernel v4.15-rc8-106-g08f36ff64234
1212 # lockdep: Make lockdep checking constant
1213 #
1214 AC_DEFUN([LIBCFS_LOCKDEP_IS_HELD], [
1215 tmp_flags="$EXTRA_KCFLAGS"
1216 EXTRA_KCFLAGS="-Werror"
1217 LB_CHECK_COMPILE([if 'lockdep_is_held()' uses const argument],
1218 lockdep_is_held, [
1219         #include <linux/lockdep.h>
1220 ],[
1221 #ifdef CONFIG_LOCKDEP
1222         const struct spinlock *lock = NULL;
1223
1224         lockdep_is_held(lock);
1225 #endif
1226 ],[],[
1227         AC_DEFINE(NEED_LOCKDEP_IS_HELD_DISCARD_CONST, 1,
1228                 [lockdep_is_held() argument is const])
1229 ])
1230 EXTRA_KCFLAGS="$tmp_flags"
1231 ]) # LIBCFS_LOCKDEP_IS_HELD
1232
1233 #
1234 # LIBCFS_TIMER_SETUP
1235 #
1236 # Kernel version 4.15 commit e99e88a9d2b067465adaa9c111ada99a041bef9a
1237 # setup_timer() was replaced by timer_setup(), where the callback
1238 # argument is the structure already holding the struct timer_list.
1239 #
1240 AC_DEFUN([LIBCFS_TIMER_SETUP], [
1241 LB_CHECK_COMPILE([if setup_timer has been replaced with timer_setup],
1242 timer_setup, [
1243         #include <linux/timer.h>
1244 ],[
1245         timer_setup(NULL, NULL, 0);
1246 ],[
1247         AC_DEFINE(HAVE_TIMER_SETUP, 1,
1248                 [timer_setup has replaced setup_timer])
1249 ])
1250 ]) # LIBCFS_TIMER_SETUP
1251
1252 #
1253 # LIBCFS_WAIT_VAR_EVENT
1254 #
1255 # Kernel version 4.16-rc4 commit 6b2bb7265f0b62605e8caee3613449ed0db270b9
1256 # added wait_var_event()
1257 #
1258 AC_DEFUN([LIBCFS_WAIT_VAR_EVENT], [
1259 LB_CHECK_COMPILE([if 'wait_var_event' exist],
1260 wait_var_event, [
1261         #ifdef HAVE_WAIT_BIT_HEADER_H
1262         #include <linux/wait_bit.h>
1263         #endif
1264         #include <linux/wait.h>
1265 ],[
1266         wake_up_var(NULL);
1267 ],[
1268         AC_DEFINE(HAVE_WAIT_VAR_EVENT, 1,
1269                 ['wait_var_event' is available])
1270 ])
1271 ]) # LIBCFS_WAIT_VAR_EVENT
1272
1273 #
1274 # LIBCFS_BITMAP_ALLOC
1275 #
1276 # Kernel version 4.17 commit c42b65e363ce97a828f81b59033c3558f8fa7f70
1277 # added bitmap memory allocation handling.
1278 #
1279 AC_DEFUN([LIBCFS_BITMAP_ALLOC], [
1280 LB_CHECK_COMPILE([if Linux bitmap memory management exist],
1281 bitmap_alloc, [
1282         #include <linux/bitmap.h>
1283 ],[
1284         unsigned long *map = bitmap_alloc(1, GFP_KERNEL);
1285 ],[
1286         AC_DEFINE(HAVE_BITMAP_ALLOC, 1,
1287                 [Linux bitmap can be allocated])
1288 ])
1289 ]) # LIBCFS_BITMAP_ALLOC
1290
1291 #
1292 # LIBCFS_CLEAR_AND_WAKE_UP_BIT
1293 #
1294 # Kernel version 4.17-rc2 commit 8236b0ae31c837d2b3a2565c5f8d77f637e824cc
1295 # added clear_and_wake_up_bit()
1296 #
1297 AC_DEFUN([LIBCFS_CLEAR_AND_WAKE_UP_BIT], [
1298 LB_CHECK_COMPILE([if 'clear_and_wake_up_bit' exist],
1299 clear_and_wake_up_bit, [
1300         #ifdef HAVE_WAIT_BIT_HEADER_H
1301         #include <linux/wait_bit.h>
1302         #endif
1303         #include <linux/wait.h>
1304 ],[
1305         clear_and_wake_up_bit(0, NULL);
1306 ],[
1307         AC_DEFINE(HAVE_CLEAR_AND_WAKE_UP_BIT, 1,
1308                 ['clear_and_wake_up_bit' is available])
1309 ])
1310 ]) # LIBCFS_CLEAR_AND_WAKE_UP_BIT
1311
1312 #
1313 # LIBCFS_TCP_SOCK_SET_NODELAY
1314 #
1315 # kernel 4.18.0-293.el8
1316 # tcp_sock_set_nodelay() was added
1317 AC_DEFUN([LIBCFS_TCP_SOCK_SET_NODELAY], [
1318 tmp_flags="$EXTRA_KCFLAGS"
1319 EXTRA_KCFLAGS="-Werror"
1320 LB_CHECK_COMPILE([if 'tcp_sock_set_nodelay()' exists],
1321 tcp_sock_set_nodelay_exists, [
1322         #include <linux/tcp.h>
1323 ],[
1324         tcp_sock_set_nodelay(NULL);
1325 ],[
1326         AC_DEFINE(HAVE_TCP_SOCK_SET_NODELAY, 1,
1327                 ['tcp_sock_set_nodelay()' exists])
1328 ])
1329 EXTRA_KCFLAGS="$tmp_flags"
1330 ]) # LIBCFS_TCP_SOCK_SET_NODELAY
1331
1332 #
1333 # LIBCFS_TCP_SOCK_SET_KEEPIDLE
1334 #
1335 # kernel 4.18.0-293.el8
1336 # tcp_sock_set_keepidle() was added
1337 AC_DEFUN([LIBCFS_TCP_SOCK_SET_KEEPIDLE], [
1338 tmp_flags="$EXTRA_KCFLAGS"
1339 EXTRA_KCFLAGS="-Werror"
1340 LB_CHECK_COMPILE([if 'tcp_sock_set_keepidle()' exists],
1341 tcp_sock_set_keepidle_exists, [
1342         #include <linux/tcp.h>
1343 ],[
1344         tcp_sock_set_keepidle(NULL, 0);
1345 ],[
1346         AC_DEFINE(HAVE_TCP_SOCK_SET_KEEPIDLE, 1,
1347                 ['tcp_sock_set_keepidle()' exists])
1348 ])
1349 EXTRA_KCFLAGS="$tmp_flags"
1350 ]) # LIBCFS_TCP_SOCK_SET_KEEPIDLE
1351
1352 #
1353 # LIBCFS_TCP_SOCK_SET_QUICKACK
1354 # kernel v5.7-rc6-2504-gddd061b8daed
1355 #   tcp: add tcp_sock_set_quickack
1356 #
1357 AC_DEFUN([LIBCFS_TCP_SOCK_SET_QUICKACK], [
1358 tmp_flags="$EXTRA_KCFLAGS"
1359 EXTRA_KCFLAGS="-Werror"
1360 LB_CHECK_COMPILE([if 'tcp_sock_set_quickack()' exists],
1361 tcp_sock_set_quickack_exists, [
1362         #include <linux/tcp.h>
1363 ],[
1364         tcp_sock_set_quickack(NULL, 0);
1365 ],[
1366         AC_DEFINE(HAVE_TCP_SOCK_SET_QUICKACK, 1,
1367                 ['tcp_sock_set_quickack()' exists])
1368 ])
1369 EXTRA_KCFLAGS="$tmp_flags"
1370 ]) # LIBCFS_TCP_SOCK_SET_QUICKACK
1371
1372 #
1373 # LIBCFS_TCP_SOCK_SET_KEEPINTVL
1374 # v5.7-rc6-2508-gd41ecaac903c
1375 # tcp: add tcp_sock_set_keepintvl
1376 #
1377 AC_DEFUN([LIBCFS_TCP_SOCK_SET_KEEPINTVL], [
1378 tmp_flags="$EXTRA_KCFLAGS"
1379 EXTRA_KCFLAGS="-Werror"
1380 LB_CHECK_COMPILE([if 'tcp_sock_set_keepintvl()' exists],
1381 tcp_sock_set_keepintvl_exists, [
1382         #include <linux/tcp.h>
1383 ],[
1384         tcp_sock_set_keepintvl(NULL, 0);
1385 ],[
1386         AC_DEFINE(HAVE_TCP_SOCK_SET_KEEPINTVL, 1,
1387                 ['tcp_sock_set_keepintvl()' exists])
1388 ])
1389 EXTRA_KCFLAGS="$tmp_flags"
1390 ]) # LIBCFS_TCP_SOCK_SET_KEEPINTVL
1391
1392 #
1393 # LIBCFS_TCP_SOCK_SET_KEEPCNT
1394 # v5.7-rc6-2509-g480aeb9639d6
1395 # tcp: add tcp_sock_set_keepcnt
1396 #
1397 AC_DEFUN([LIBCFS_TCP_SOCK_SET_KEEPCNT], [
1398 tmp_flags="$EXTRA_KCFLAGS"
1399 EXTRA_KCFLAGS="-Werror"
1400 LB_CHECK_COMPILE([if 'tcp_sock_set_keepcnt()' exists],
1401 tcp_sock_set_keepcnt_exists, [
1402         #include <linux/tcp.h>
1403 ],[
1404         tcp_sock_set_keepcnt(NULL, 0);
1405 ],[
1406         AC_DEFINE(HAVE_TCP_SOCK_SET_KEEPCNT, 1,
1407                 ['tcp_sock_set_keepcnt()' exists])
1408 ])
1409 EXTRA_KCFLAGS="$tmp_flags"
1410 ]) # LIBCFS_TCP_SOCK_SET_KEEPCNT
1411
1412 #
1413 # LIBCFS_XARRAY_SUPPORT
1414 #
1415 # 4.19-rc5 kernel commit 3159f943aafdbacb2f94c38fdaadabf2bbde2a14
1416 # replaced the radix tree implementation with Xarrays. This change
1417 # introduced functionaly needed for general Xarray support
1418 #
1419 AC_DEFUN([LIBCFS_XARRAY_SUPPORT], [
1420 tmp_flags="$EXTRA_KCFLAGS"
1421 EXTRA_KCFLAGS="-Werror"
1422 LB_CHECK_COMPILE([if page cache uses Xarray],
1423 xarray_support, [
1424         #include <linux/xarray.h>
1425 ],[
1426         xa_is_value(NULL);
1427 ],[
1428         AC_DEFINE(HAVE_XARRAY_SUPPORT, 1,
1429                 [kernel Xarray implementation lacks 'xa_is_value'])
1430 ])
1431 EXTRA_KCFLAGS="$tmp_flags"
1432 ]) # LIBCFS_XARRAY_SUPPORT
1433
1434 #
1435 # Kernel version 4.19-rc6 commit 4a19edb60d0203cd5bf95a8b46ea8f63fd41194c
1436 # added extended ACK handling to Netlink dump handlers
1437 #
1438 AC_DEFUN([LIBCFS_NL_DUMP_EXT_ACK], [
1439 LB_CHECK_COMPILE([if Netlink dump handlers support ext_ack],
1440 netlink_dump_ext_ack, [
1441         #include <net/netlink.h>
1442 ],[
1443         struct netlink_callback *cb = NULL;
1444         cb->extack = NULL;
1445 ],[
1446         AC_DEFINE(HAVE_NL_DUMP_WITH_EXT_ACK, 1,
1447                 [netlink_ext_ack is handled for Netlink dump handlers])
1448 ])
1449 ]) # LIBCFS_NL_DUMP_EXT_ACK
1450
1451 #
1452 # LIBCFS_HAVE_IOV_ITER_TYPE
1453 #
1454 # kernel 4.20 commit 00e23707442a75b404392cef1405ab4fd498de6b
1455 # iov_iter: Use accessor functions to access an iterator's type and direction.
1456 #
1457 AC_DEFUN([LIBCFS_HAVE_IOV_ITER_TYPE], [
1458 tmp_flags="$EXTRA_KCFLAGS"
1459 EXTRA_KCFLAGS="-Werror"
1460 LB_CHECK_COMPILE([if iov_iter_type exists],
1461 macro_iov_iter_type_exists, [
1462         #include <linux/uio.h>
1463 ],[
1464         struct iov_iter iter = { .type = ITER_KVEC };
1465         enum iter_type type = iov_iter_type(&iter);
1466         (void)type;
1467 ],[
1468         AC_DEFINE(HAVE_IOV_ITER_TYPE, 1,
1469                 [if iov_iter_type exists])
1470 ])
1471 EXTRA_KCFLAGS="$tmp_flags"
1472 ]) # LIBCFS_HAVE_IOV_ITER_TYPE
1473
1474 #
1475 # LIBCFS_GET_REQUEST_KEY_AUTH
1476 #
1477 # kernel 5.0 commit 822ad64d7e46a8e2c8b8a796738d7b657cbb146d
1478 # keys: Fix dependency loop between construction record and auth key
1479 #
1480 # Added <keys/request_key_auth-type.h> and get_request_key_auth()
1481 # which was propagated to stable
1482 #
1483 AC_DEFUN([LIBCFS_GET_REQUEST_KEY_AUTH], [
1484 tmp_flags="$EXTRA_KCFLAGS"
1485 EXTRA_KCFLAGS="-Werror"
1486 LB_CHECK_COMPILE([if get_request_key_auth() is available],
1487 get_request_key_auth_exported, [
1488         #include <linux/key.h>
1489         #include <linux/keyctl.h>
1490         #include <keys/request_key_auth-type.h>
1491 ],[
1492         struct key *ring;
1493         const struct key *key = NULL;
1494         struct request_key_auth *rka = get_request_key_auth(key);
1495
1496         ring = key_get(rka->dest_keyring);
1497 ],[
1498         AC_DEFINE(HAVE_GET_REQUEST_KEY_AUTH, 1,
1499                 [get_request_key_auth() is available])
1500 ])
1501 EXTRA_KCFLAGS="$tmp_flags"
1502 ]) # LIBCFS_GET_REQUEST_KEY_AUTH
1503
1504 #
1505 # LIBCFS_LOOKUP_USER_KEY
1506 #
1507 # kernel 5.3 commit 3cf5d076fb4d48979f382bc9452765bf8b79e740
1508 # signal: Remove task parameter from force_sig
1509 #
1510 AC_DEFUN([LIBCFS_LOOKUP_USER_KEY], [
1511 tmp_flags="$EXTRA_KCFLAGS"
1512 EXTRA_KCFLAGS="-Werror"
1513 LB_CHECK_COMPILE([if lookup_user_key() is available],
1514 lookup_user_key_exported, [
1515         #include <linux/key.h>
1516         #include <linux/keyctl.h>
1517 ],[
1518         lookup_user_key(KEY_SPEC_USER_KEYRING, 0, 0);
1519 ],[
1520         AC_DEFINE(HAVE_LOOKUP_USER_KEY, 1,
1521                 [lookup_user_key() is available])
1522 ])
1523 EXTRA_KCFLAGS="$tmp_flags"
1524 ]) # LIBCFS_LOOKUP_USER_KEY
1525
1526 #
1527 # LIBCFS_FORCE_SIG_WITH_TASK
1528 #
1529 # kernel 5.3 commit 3cf5d076fb4d48979f382bc9452765bf8b79e740
1530 # signal: Remove task parameter from force_sig
1531 #
1532 AC_DEFUN([LIBCFS_FORCE_SIG_WITH_TASK], [
1533 tmp_flags="$EXTRA_KCFLAGS"
1534 EXTRA_KCFLAGS="-Werror"
1535 LB_CHECK_COMPILE([if force_sig has task parameter],
1536 force_sig_with_task, [
1537         #include <linux/sched/signal.h>
1538 ],[
1539         force_sig(SIGINT, NULL);
1540 ],[
1541         AC_DEFINE(HAVE_FORCE_SIG_WITH_TASK, 1,
1542                 [force_sig() has task parameter])
1543 ])
1544 EXTRA_KCFLAGS="$tmp_flags"
1545 ]) # LIBCFS_FORCE_SIG_WITH_TASK
1546
1547 #
1548 # LIBCFS_CACHE_DETAIL_WRITERS
1549 #
1550 # kernel v5.3-rc2-1-g64a38e840ce5
1551 # SUNRPC: Track writers of the 'channel' file to improve cache_listeners_exist
1552 #
1553 AC_DEFUN([LIBCFS_CACHE_DETAIL_WRITERS], [
1554 tmp_flags="$EXTRA_KCFLAGS"
1555 EXTRA_KCFLAGS="-Werror"
1556 LB_CHECK_COMPILE([if struct cache_detail has writers],
1557 cache_detail_writers_atomic, [
1558         #include <linux/sunrpc/cache.h>
1559
1560         static struct cache_detail rsi_cache;
1561 ],[
1562         atomic_set(&rsi_cache.writers, 0);
1563 ],[
1564         AC_DEFINE(HAVE_CACHE_DETAIL_WRITERS, 1,
1565                 [struct cache_detail has writers])
1566 ])
1567 EXTRA_KCFLAGS="$tmp_flags"
1568 ]) # LIBCFS_CACHE_DETAIL_WRITERS
1569
1570 #
1571 # LIBCFS_GENL_DUMPIT_INFO
1572 #
1573 # kernel v5.4-rc1 commit bf813b0afeae2f012f0e527a526c1b78ca21ad82
1574 # expanded struct genl_dumpit_info to include struct genl_family.
1575 #
1576 AC_DEFUN([LIBCFS_GENL_DUMPIT_INFO], [
1577 tmp_flags="$EXTRA_KCFLAGS"
1578 EXTRA_KCFLAGS="-Werror"
1579 LB_CHECK_COMPILE([if struct genl_dumpit_info has family field],
1580 genl_dumpit_info, [
1581         #include <net/genetlink.h>
1582 ],[
1583         static struct genl_dumpit_info info;
1584
1585         info.family = NULL;
1586 ],[
1587         AC_DEFINE(HAVE_GENL_DUMPIT_INFO, 1,
1588                 [struct genl_dumpit_info has family field])
1589 ])
1590 EXTRA_KCFLAGS="$tmp_flags"
1591 ]) # LIBCFS_GENL_DUMPIT_INFO
1592
1593 #
1594 # LIBCFS_KALLSYMS_LOOKUP
1595 #
1596 # kernel v5.6-11591-g0bd476e6c671
1597 # kallsyms: unexport kallsyms_lookup_name() and kallsyms_on_each_symbol()
1598 AC_DEFUN([LIBCFS_KALLSYMS_LOOKUP], [
1599 LB_CHECK_EXPORT([kallsyms_lookup_name], [kernel/kallsyms.c],
1600         [AC_DEFINE(HAVE_KALLSYMS_LOOKUP_NAME, 1,
1601                 [kallsyms_lookup_name is exported by kernel])])
1602 ]) # LIBCFS_KALLSYMS_LOOKUP
1603
1604 #
1605 # v5.5-8862-gd56c0d45f0e2
1606 # proc: decouple proc from VFS with "struct proc_ops"
1607 #
1608 AC_DEFUN([LIBCFS_SRC_HAVE_PROC_OPS], [
1609         LB2_LINUX_TEST_SRC([proc_ops], [
1610                 #include <linux/proc_fs.h>
1611
1612                 static struct proc_ops *my_proc;
1613         ],[
1614                 my_proc->proc_lseek = NULL;
1615         ],[-Werror])
1616 ]) # LIBCFS_SRC_HAVE_PROC_OPS
1617 AC_DEFUN([LIBCFS_HAVE_PROC_OPS], [
1618         AC_MSG_CHECKING([if struct proc_ops exists])
1619         LB2_LINUX_TEST_RESULT([proc_ops], [
1620                 AC_DEFINE(HAVE_PROC_OPS, 1,
1621                         [struct proc_ops exists])
1622                 AC_MSG_RESULT(yes)
1623         ],[
1624                 AC_MSG_RESULT(no)
1625         ])
1626 ]) # LIBCFS_HAVE_PROC_OPS
1627
1628 #
1629 # LIBCFS_VMALLOC_2ARGS
1630 #
1631 # kernel v5.8-rc1~201^2~19
1632 # mm: remove the pgprot argument to __vmalloc
1633 AC_DEFUN([LIBCFS_VMALLOC_2ARGS], [
1634 LB_CHECK_COMPILE([if __vmalloc has 2 args],
1635 vmalloc_2args, [
1636         #include <linux/vmalloc.h>
1637 ],[
1638         __vmalloc(0, 0);
1639 ],[
1640         AC_DEFINE(HAVE_VMALLOC_2ARGS, 1,
1641                 [__vmalloc only takes 2 args.])
1642 ])
1643 ]) # LIBCFS_VMALLOC_2ARGS
1644
1645 #
1646 # LIBCFS_HAVE_NR_UNSTABLE_NFS
1647 #
1648 # kernel v5.8-rc1~201^2~75
1649 # mm/writeback: discard NR_UNSTABLE_NFS, use NR_WRITEBACK instead
1650 #
1651 AC_DEFUN([LIBCFS_HAVE_NR_UNSTABLE_NFS], [
1652 tmp_flags="$EXTRA_KCFLAGS"
1653 EXTRA_KCFLAGS="-Werror"
1654 LB_CHECK_COMPILE([if NR_UNSTABLE_NFS still in use],
1655 nr_unstable_nfs_exists, [
1656         #include <linux/mm.h>
1657
1658         int i;
1659 ],[
1660         i = NR_UNSTABLE_NFS;
1661 ],[
1662         AC_DEFINE(HAVE_NR_UNSTABLE_NFS, 1,
1663                 [NR_UNSTABLE_NFS is still in use.])
1664 ])
1665 EXTRA_KCFLAGS="$tmp_flags"
1666 ]) # LIBCFS_HAVE_NR_UNSTABLE_NFS
1667
1668 #
1669 # LIBCFS_HAVE_MMAP_LOCK
1670 #
1671 # kernel v5.8-rc1~83^2~24
1672 # mmap locking API: rename mmap_sem to mmap_lock
1673 #
1674 AC_DEFUN([LIBCFS_HAVE_MMAP_LOCK], [
1675 LB_CHECK_COMPILE([if mmap_lock API is available],
1676 mmap_write_lock, [
1677         #include <linux/mm.h>
1678 ],[
1679         mmap_write_lock(NULL);
1680 ],[
1681         AC_DEFINE(HAVE_MMAP_LOCK, 1,
1682                 [mmap_lock API is available.])
1683 ])
1684 ]) # LIBCFS_HAVE_MMAP_LOCK
1685
1686 #
1687 # LIBCFS_KERNEL_SETSOCKOPT
1688 #
1689 # kernel v5.8-rc1~165^2~59^2
1690 # net: remove kernel_setsockopt
1691 AC_DEFUN([LIBCFS_KERNEL_SETSOCKOPT], [
1692 tmp_flags="$EXTRA_KCFLAGS"
1693 EXTRA_KCFLAGS="-Werror"
1694 LB_CHECK_COMPILE([if kernel_setsockopt still in use],
1695 kernel_setsockopt_exists, [
1696         #include <linux/net.h>
1697 ],[
1698         kernel_setsockopt(NULL, 0, 0, NULL, 0);
1699 ],[
1700         AC_DEFINE(HAVE_KERNEL_SETSOCKOPT, 1,
1701                 [kernel_setsockopt still in use])
1702 ])
1703 EXTRA_KCFLAGS="$tmp_flags"
1704 ]) # LIBCFS_KERNEL_SETSOCKOPT
1705
1706 #
1707 # LIBCFS_SEC_RELEASE_SECCTX
1708 #
1709 # kernel linux-hwe-5.8 (5.8.0-22.23~20.04.1)
1710 # LSM: Use lsmcontext in security_release_secctx
1711 AC_DEFUN([LIBCFS_SEC_RELEASE_SECCTX], [
1712 LB_CHECK_COMPILE([if security_release_secctx has 1 arg],
1713 security_release_secctx_1arg, [
1714         #include <linux/security.h>
1715 ],[
1716         security_release_secctx(NULL);
1717 ],[
1718         AC_DEFINE(HAVE_SEC_RELEASE_SECCTX_1ARG, 1,
1719                 [security_release_secctx has 1 arg.])
1720 ])
1721 ]) # LIBCFS_SEC_RELEASE_SECCTX
1722
1723 #
1724 # LIBCFS_HAVE_KFREE_SENSITIVE
1725 #
1726 # kernel v5.10-rc1~3
1727 # mm: remove kzfree() compatibility definition
1728 #
1729 AC_DEFUN([LIBCFS_HAVE_KFREE_SENSITIVE], [
1730 LB_CHECK_COMPILE([if kfree_sensitive() is available],
1731 kfree_sensitive_exists, [
1732         #include <linux/slab.h>
1733
1734 ],[
1735         kfree_sensitive(NULL);
1736 ],[
1737         AC_DEFINE(HAVE_KFREE_SENSITIVE, 1,
1738                 [kfree_sensitive() is available.])
1739 ])
1740 EXTRA_KCFLAGS="$tmp_flags"
1741 ]) # LIBCFS_HAVE_KFREE_SENSITIVE
1742
1743 #
1744 # LIBCFS_HAVE_CRYPTO_SHA2_HEADER
1745 #
1746 # Kernel v5.10-rc1-114-ga24d22b225ce
1747 # crypto: sha - split sha.h into sha1.h and sha2.h
1748 #
1749 AC_DEFUN([LIBCFS_HAVE_CRYPTO_SHA2_HEADER], [
1750 LB_CHECK_LINUX_HEADER([crypto/sha2.h], [
1751         AC_DEFINE(HAVE_CRYPTO_SHA2_HEADER, 1,
1752                 [crypto/sha2.h is present])])
1753 ]) # LIBCFS_HAVE_CRYPTO_SHA2_HEADER
1754
1755 #
1756 # LIBCFS_HAVE_LIST_CMP_FUNC_T
1757 #
1758 # kernel 5.10.70 commit 4f0f586bf0c898233d8f316f471a21db2abd522d
1759 # treewide: Change list_sort to use const pointers
1760 AC_DEFUN([LIBCFS_HAVE_LIST_CMP_FUNC_T], [
1761 tmp_flags="$EXTRA_KCFLAGS"
1762 EXTRA_KCFLAGS="-Werror -Wno-unused-variable"
1763 LB_CHECK_COMPILE([if list_cmp_func_t type is defined],
1764 list_cmp_func_t, [
1765         #include <linux/list_sort.h>
1766 ],[
1767         list_cmp_func_t cmp;
1768 ],[
1769         AC_DEFINE(HAVE_LIST_CMP_FUNC_T, 1,
1770                 [list_cmp_func_t type is defined])
1771 ])
1772 EXTRA_KCFLAGS="$tmp_flags"
1773 ]) # LIBCFS_HAVE_LIST_CMP_FUNC_T
1774
1775 #
1776 # LIBCFS_NLA_STRSCPY
1777 #
1778 # Kernel version 5.10-rc3 commit 872f690341948b502c93318f806d821c56772c42
1779 # replaced nla_strlcpy() with nla_strscpy().
1780 #
1781 AC_DEFUN([LIBCFS_SRC_NLA_STRSCPY], [
1782         LB2_LINUX_TEST_SRC([nla_strscpy], [
1783                 #include <net/netlink.h>
1784         ],[
1785                 if (nla_strscpy(NULL, NULL, 0) < 0)
1786                         return -EINVAL;
1787         ],[
1788         ],[])
1789 ])
1790 AC_DEFUN([LIBCFS_NLA_STRSCPY], [
1791         AC_MSG_CHECKING([if 'nla_strscpy()' exists])
1792         LB2_LINUX_TEST_RESULT([nla_strscpy], [
1793                 AC_DEFINE(HAVE_NLA_STRSCPY, 1,
1794                         ['nla_strscpy' is available])
1795                 AC_MSG_RESULT(yes)
1796         ],[
1797                 AC_MSG_RESULT(no)
1798         ])
1799 ]) # LIBCFS_NLA_STRSCPY
1800
1801 #
1802 # LIBCFS_HAVE_CIPHER_HEADER
1803 #
1804 # Kernel 5.12 commit 0eb76ba29d16df2951d37c54ca279c4e5630b071
1805 # crypto: remove cipher routines from public crypto API
1806 #
1807 AC_DEFUN([LIBCFS_HAVE_CIPHER_HEADER], [
1808 tmp_flags="$EXTRA_KCFLAGS"
1809 EXTRA_KCFLAGS="-Werror"
1810 LB_CHECK_LINUX_HEADER([crypto/internal/cipher.h], [
1811         AC_DEFINE(HAVE_CIPHER_H, 1,
1812                 [crypto/internal/cipher.h is present])
1813 ])
1814 EXTRA_KCFLAGS="$tmp_flags"
1815 ]) # LIBCFS_HAVE_CIPHER_HEADER
1816
1817 #
1818 # LIBCFS_HAVE_PANIC_NOTIFIER_HEADER
1819 #
1820 # Kernel 5.14 commit f39650de687e35766572ac89dbcd16a5911e2f0a
1821 # kernel.h: split out panic and oops helpers
1822 #
1823 AC_DEFUN([LIBCFS_HAVE_PANIC_NOTIFIER_HEADER], [
1824 tmp_flags="$EXTRA_KCFLAGS"
1825 EXTRA_KCFLAGS="-Werror"
1826 LB_CHECK_LINUX_HEADER([linux/panic_notifier.h], [
1827         AC_DEFINE(HAVE_PANIC_NOTIFIER_H, 1,
1828                 [linux/panic_notifier.h is present])
1829 ])
1830 EXTRA_KCFLAGS="$tmp_flags"
1831 ]) # LIBCFS_HAVE_PANIC_NOTIFIER_HEADER
1832
1833 #
1834 # LIBCFS_PARAM_SET_UINT_MINMAX
1835 #
1836 # Kernel 5.15-rc1 commit 2a14c9ae15a38148484a128b84bff7e9ffd90d68
1837 # moved param_set_uint_minmax to common code
1838 #
1839 AC_DEFUN([LIBCFS_PARAM_SET_UINT_MINMAX],[
1840 LB_CHECK_COMPILE([does function 'param_set_uint_minmax' exist],
1841 param_set_uint_minmax, [
1842         #include <linux/moduleparam.h>
1843 ],[
1844         param_set_uint_minmax(NULL, NULL, 0, 0);
1845 ],[
1846         AC_DEFINE(HAVE_PARAM_SET_UINT_MINMAX, 1,
1847                 ['param_set_uint_minmax' is available])
1848 ])
1849 ]) # LIBCFS_PARAM_SET_UINT_MINMAX
1850
1851 AC_DEFUN([LIBCFS_PROG_LINUX_SRC], [
1852         # 5.6
1853         LIBCFS_SRC_HAVE_PROC_OPS
1854         # 5.10
1855         LIBCFS_SRC_NLA_STRSCPY
1856
1857         AC_MSG_CHECKING([for available kernel interfaces to libcfs])
1858         LB2_LINUX_TEST_COMPILE_ALL([libcfs])
1859         AC_MSG_RESULT([done])
1860 ])
1861 AC_DEFUN([LIBCFS_PROG_LINUX_RESULTS], [
1862         # 5.6
1863         LIBCFS_HAVE_PROC_OPS
1864         # 5.10
1865         LIBCFS_NLA_STRSCPY
1866 ])
1867
1868 #
1869 # LIBCFS_PROG_LINUX
1870 #
1871 # LibCFS linux kernel checks
1872 #
1873 AC_DEFUN([LIBCFS_PROG_LINUX], [
1874 AC_MSG_NOTICE([LibCFS kernel checks
1875 ==============================================================================])
1876 LIBCFS_CONFIG_PANIC_DUMPLOG
1877
1878 # 3.11
1879 LIBCFS_KTIME_GET_TS64
1880 # 3.12
1881 LIBCFS_PREPARE_TO_WAIT_EVENT
1882 LIBCFS_KERNEL_PARAM_OPS
1883 LIBCFS_KTIME_ADD
1884 LIBCFS_KTIME_AFTER
1885 LIBCFS_KTIME_BEFORE
1886 LIBCFS_KTIME_COMPARE
1887 LIBCFS_SHRINKER_COUNT
1888 # 3.13
1889 LIBCFS_MATCH_WILDCARD
1890 # 3.15
1891 LIBCFS_HAVE_MAPPING_AS_EXITING_FLAG
1892 LIBCFS_IOV_ITER_HAS_TYPE
1893 # 3.16
1894 LIBCFS_HAVE_GLOB
1895 LIBCFS_HAVE_NS_TO_TIMESPEC64
1896 # 3.17
1897 LIBCFS_HLIST_ADD_AFTER
1898 LIBCFS_TIMESPEC64
1899 LIBCFS_KTIME_GET_NS
1900 LIBCFS_KTIME_GET_REAL_TS64
1901 LIBCFS_KTIME_GET_REAL_SECONDS
1902 LIBCFS_KTIME_GET_REAL_NS
1903 LIBCFS_KTIME_TO_TIMESPEC64
1904 LIBCFS_TIMESPEC64_SUB
1905 LIBCFS_TIMESPEC64_TO_KTIME
1906 # 3.19
1907 LIBCFS_KTIME_GET_SECONDS
1908 LIBCFS_WAIT_WOKEN
1909 # 4.0
1910 LIBCFS_KTIME_MS_DELTA
1911 # 4.1
1912 LIBCFS_KERNEL_PARAM_LOCK
1913 # 4.2
1914 LIBCFS_HAVE_TOPOLOGY_SIBLING_CPUMASK
1915 # 4.4
1916 LIBCFS_KSTRTOBOOL_FROM_USER
1917 LIBCFS_NETLINK_CALLBACK_START
1918 # 4.5
1919 LIBCFS_CRYPTO_HASH_HELPERS
1920 LIBCFS_EXPORT_KSET_FIND_OBJ
1921 LIBCFS_RHASHTABLE_REPLACE
1922 # 4.6
1923 LIBCFS_BROKEN_HASH_64
1924 LIBCFS_STACKTRACE_OPS_ADDRESS_RETURN_INT
1925 LIBCFS_GET_USER_PAGES_6ARG
1926 LIBCFS_STRINGHASH
1927 # 4.7
1928 LIBCFS_RHASHTABLE_INSERT_FAST
1929 LIBCFS_RHASHTABLE_WALK_INIT_3ARG
1930 # 4.8
1931 LIBCFS_RHASHTABLE_LOOKUP
1932 LIBCFS_RHLTABLE
1933 LIBCFS_STACKTRACE_OPS
1934 # 4.9
1935 LIBCFS_GET_USER_PAGES_GUP_FLAGS
1936 LIBCFS_RHASHTABLE_WALK_ENTER
1937 # 4.10
1938 LIBCFS_HOTPLUG_STATE_MACHINE
1939 LIBCFS_REFCOUNT_T
1940 # 4.11
1941 LIBCFS_RHASHTABLE_LOOKUP_GET_INSERT_FAST
1942 LIBCFS_SCHED_HEADERS
1943 LIBCFS_KREF_READ
1944 LIBCFS_RHT_BUCKET_VAR
1945 # 4.12
1946 LIBCFS_HAVE_PROCESSOR_HEADER
1947 LIBCFS_HAVE_WAIT_BIT_HEADER
1948 LIBCFS_MEMALLOC_NORECLAIM
1949 LIBCFS_NL_EXT_ACK
1950 LIBCFS_WAIT_QUEUE_TASK_LIST_RENAME
1951 LIBCFS_CPUS_READ_LOCK
1952 LIBCFS_UUID_T
1953 # 4.13
1954 LIBCFS_NLA_STRDUP
1955 LIBCFS_WAIT_QUEUE_ENTRY
1956 LIBCFS_WAIT_BIT_QUEUE_ENTRY_EXISTS
1957 # 4.14
1958 LIBCFS_DEFINE_TIMER
1959 LIBCFS_NEW_KERNEL_WRITE
1960 LIBCFS_NEW_KERNEL_READ
1961 LIBCFS_EXPORT_SAVE_STACK_TRACE_TSK
1962 # 4.15
1963 LIBCFS_LOCKDEP_IS_HELD
1964 LIBCFS_TIMER_SETUP
1965 # 4.16
1966 LIBCFS_WAIT_VAR_EVENT
1967 # 4.17
1968 LIBCFS_BITMAP_ALLOC
1969 LIBCFS_CLEAR_AND_WAKE_UP_BIT
1970 # 4.18
1971 LIBCFS_TCP_SOCK_SET_NODELAY
1972 LIBCFS_TCP_SOCK_SET_KEEPIDLE
1973 # 4.19
1974 LIBCFS_XARRAY_SUPPORT
1975 LIBCFS_NL_DUMP_EXT_ACK
1976 # 4.20
1977 LIBCFS_HAVE_IOV_ITER_TYPE
1978 # 5.0
1979 LIBCFS_MM_TOTALRAM_PAGES_FUNC
1980 LIBCFS_GET_REQUEST_KEY_AUTH
1981 # 5.3
1982 LIBCFS_LOOKUP_USER_KEY
1983 LIBCFS_FORCE_SIG_WITH_TASK
1984 LIBCFS_CACHE_DETAIL_WRITERS
1985 # 5.4
1986 LIBCFS_GENL_DUMPIT_INFO
1987 # 5.7
1988 LIBCFS_KALLSYMS_LOOKUP
1989 LIBCFS_TCP_SOCK_SET_QUICKACK
1990 LIBCFS_TCP_SOCK_SET_KEEPINTVL
1991 LIBCFS_TCP_SOCK_SET_KEEPCNT
1992 # 5.8
1993 LIBCFS_HAVE_MMAP_LOCK
1994 LIBCFS_KERNEL_SETSOCKOPT
1995 LIBCFS_VMALLOC_2ARGS
1996 LIBCFS_HAVE_NR_UNSTABLE_NFS
1997 LIBCFS_SEC_RELEASE_SECCTX
1998 # 5.10
1999 LIBCFS_HAVE_KFREE_SENSITIVE
2000 LIBCFS_HAVE_CRYPTO_SHA2_HEADER
2001 LIBCFS_HAVE_LIST_CMP_FUNC_T
2002 # 5.12
2003 LIBCFS_HAVE_CIPHER_HEADER
2004 # 5.14
2005 LIBCFS_HAVE_PANIC_NOTIFIER_HEADER
2006 # 5.15
2007 LIBCFS_PARAM_SET_UINT_MINMAX
2008 ]) # LIBCFS_PROG_LINUX
2009
2010 #
2011 # LIBCFS_PATH_DEFAULTS
2012 #
2013 # default paths for installed files
2014 #
2015 AC_DEFUN([LIBCFS_PATH_DEFAULTS], [
2016 ]) # LIBCFS_PATH_DEFAULTS
2017
2018 #
2019 # LIBCFS_CONFIGURE
2020 #
2021 # other configure checks
2022 #
2023 AC_DEFUN([LIBCFS_CONFIGURE], [
2024 AC_MSG_NOTICE([LibCFS core checks
2025 ==============================================================================])
2026
2027 # libcfs/libcfs/util/nidstrings.c
2028 AC_CHECK_HEADERS([netdb.h asm/types.h endian.h])
2029 AC_CHECK_FUNCS([gethostbyname])
2030
2031 # --------  Check for required packages  --------------
2032
2033 AC_MSG_NOTICE([LibCFS required packages checks
2034 ==============================================================================])
2035
2036 AC_MSG_CHECKING([whether to enable readline support])
2037 AC_ARG_ENABLE(readline,
2038         AC_HELP_STRING([--disable-readline],
2039                 [disable readline support]),
2040         [], [enable_readline="yes"])
2041 AC_MSG_RESULT([$enable_readline])
2042
2043 LIBREADLINE=""
2044 AS_IF([test "x$enable_readline" = xyes], [
2045         AC_CHECK_LIB([readline], [readline], [
2046                 LIBREADLINE="-lreadline"
2047                 AC_DEFINE(HAVE_LIBREADLINE, 1,
2048                         [readline library is available])
2049         ])
2050 ])
2051 AC_SUBST(LIBREADLINE)
2052
2053 AC_MSG_CHECKING([whether to use libpthread for libcfs library])
2054 AC_ARG_ENABLE([libpthread],
2055         AC_HELP_STRING([--disable-libpthread],
2056                 [disable libpthread]),
2057         [], [enable_libpthread="yes"])
2058 AC_MSG_RESULT([$enable_libpthread])
2059
2060 PTHREAD_LIBS=""
2061 AS_IF([test "x$enable_libpthread" = xyes], [
2062         AC_CHECK_LIB([pthread], [pthread_create], [
2063                 PTHREAD_LIBS="-lpthread"
2064                 AC_DEFINE([HAVE_LIBPTHREAD], 1,
2065                         [use libpthread for libcfs library])
2066         ])
2067 ], [
2068         AC_MSG_WARN([Using libpthread for libcfs library is disabled explicitly])
2069 ])
2070 AC_SUBST(PTHREAD_LIBS)
2071 ]) # LIBCFS_CONFIGURE
2072
2073 #
2074 # LIBCFS_CONFIG_FILES
2075 #
2076 # files that should be generated with AC_OUTPUT
2077 #
2078 AC_DEFUN([LIBCFS_CONFIG_FILES], [
2079 AC_CONFIG_FILES([
2080 libcfs/Makefile
2081 libcfs/autoMakefile
2082 libcfs/autoconf/Makefile
2083 libcfs/include/Makefile
2084 libcfs/include/libcfs/Makefile
2085 libcfs/include/uapi/Makefile
2086 libcfs/include/libcfs/linux/Makefile
2087 libcfs/include/libcfs/util/Makefile
2088 libcfs/include/libcfs/crypto/Makefile
2089 libcfs/include/uapi/linux/Makefile
2090 libcfs/libcfs/Makefile
2091 libcfs/libcfs/autoMakefile
2092 libcfs/libcfs/linux/Makefile
2093 libcfs/libcfs/util/Makefile
2094 libcfs/libcfs/crypto/Makefile
2095 ])
2096 ]) # LIBCFS_CONFIG_FILES