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