config/spl-build.m4

   1 dnl #
   2 dnl # Default SPL kernel configuration
   3 dnl #
   4 AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
   5         SPL_AC_KERNEL
   6
   7         dnl # Kernel build make options
   8         dnl # KERNELMAKE_PARAMS="V=1"   # Enable verbose module build
   9         KERNELMAKE_PARAMS="V=1"
  10
  11         dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
  12         dnl # compiler options are added by the kernel build system.
  13         abs_srcdir=`readlink -f ${srcdir}`
  14         KERNELCPPFLAGS="$KERNELCPPFLAGS -Wstrict-prototypes -Werror"
  15         KERNELCPPFLAGS="$KERNELCPPFLAGS -I${abs_srcdir} -I${abs_srcdir}/include"
  16
  17         if test "${LINUX_OBJ}" != "${LINUX}"; then
  18                 KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
  19         fi
  20
  21         AC_SUBST(KERNELMAKE_PARAMS)
  22         AC_SUBST(KERNELCPPFLAGS)
  23
  24         SPL_AC_DEBUG
  25         SPL_AC_DEBUG_KMEM
  26         SPL_AC_DEBUG_MUTEX
  27         SPL_AC_DEBUG_KSTAT
  28         SPL_AC_DEBUG_CALLB
  29         SPL_AC_TYPE_UINTPTR_T
  30         SPL_AC_TYPE_ATOMIC64_T
  31         SPL_AC_3ARGS_INIT_WORK
  32         SPL_AC_2ARGS_REGISTER_SYSCTL
  33         SPL_AC_SET_SHRINKER
  34         SPL_AC_PATH_IN_NAMEIDATA
  35         SPL_AC_TASK_CURR
  36         SPL_AC_CTL_UNNUMBERED
  37         SPL_AC_FLS64
  38         SPL_AC_DEVICE_CREATE
  39         SPL_AC_5ARGS_DEVICE_CREATE
  40         SPL_AC_CLASS_DEVICE_CREATE
  41         SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT
  42         SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE
  43         SPL_AC_TIMESPEC_SUB
  44         SPL_AC_INIT_UTSNAME
  45         SPL_AC_FDTABLE_HEADER
  46         SPL_AC_FILES_FDTABLE
  47         SPL_AC_UACCESS_HEADER
  48         SPL_AC_KMALLOC_NODE
  49         SPL_AC_MONOTONIC_CLOCK
  50         SPL_AC_INODE_I_MUTEX
  51         SPL_AC_MUTEX_LOCK_NESTED
  52         SPL_AC_DIV64_64
  53         SPL_AC_DIV64_U64
  54         SPL_AC_3ARGS_ON_EACH_CPU
  55         SPL_AC_KALLSYMS_LOOKUP_NAME
  56         SPL_AC_GET_VMALLOC_INFO
  57         SPL_AC_PGDAT_HELPERS
  58         SPL_AC_FIRST_ONLINE_PGDAT
  59         SPL_AC_NEXT_ONLINE_PGDAT
  60         SPL_AC_NEXT_ZONE
  61         SPL_AC_PGDAT_LIST
  62         SPL_AC_GLOBAL_PAGE_STATE
  63         SPL_AC_ZONE_STAT_ITEM_FREE
  64         SPL_AC_ZONE_STAT_ITEM_INACTIVE
  65         SPL_AC_ZONE_STAT_ITEM_ACTIVE
  66         SPL_AC_GET_ZONE_COUNTS
  67         SPL_AC_2ARGS_VFS_UNLINK
  68         SPL_AC_4ARGS_VFS_RENAME
  69         SPL_AC_CRED_STRUCT
  70         SPL_AC_GROUPS_SEARCH
  71         SPL_AC_PUT_TASK_STRUCT
  72 ])
  73
  74 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
  75         modpost=$LINUX/scripts/Makefile.modpost
  76         AC_MSG_CHECKING([kernel file name for module symbols])
  77         if test -f "$modpost"; then
  78                 if grep -q Modules.symvers $modpost; then
  79                         LINUX_SYMBOLS=Modules.symvers
  80                 else
  81                         LINUX_SYMBOLS=Module.symvers
  82                 fi
  83         else
  84                 LINUX_SYMBOLS=NONE
  85         fi
  86         AC_MSG_RESULT($LINUX_SYMBOLS)
  87         AC_SUBST(LINUX_SYMBOLS)
  88 ])
  89
  90 AC_DEFUN([SPL_AC_KERNEL], [
  91         AC_ARG_WITH([linux],
  92                 AS_HELP_STRING([--with-linux=PATH],
  93                 [Path to kernel source]),
  94                 [kernelsrc="$withval"])
  95
  96         AC_ARG_WITH([linux-obj],
  97                 AS_HELP_STRING([--with-linux-obj=PATH],
  98                 [Path to kernel build objects]),
  99                 [kernelbuild="$withval"])
 100
 101         AC_MSG_CHECKING([kernel source directory])
 102         if test -z "$kernelsrc"; then
 103                 sourcelink=`ls -1d /usr/src/kernels/* /usr/src/linux-* \
 104                             2>/dev/null | grep -v obj | tail -1`
 105
 106                 if test -e ${sourcelink}; then
 107                         kernelsrc=`readlink -f ${sourcelink}`
 108                 else
 109                         AC_MSG_RESULT([Not found])
 110                         AC_MSG_ERROR([
 111                         *** Please specify the location of the kernel source
 112                         *** with the '--with-linux=PATH' option])
 113                 fi
 114         else
 115                 if test "$kernelsrc" = "NONE"; then
 116                         kernsrcver=NONE
 117                 fi
 118         fi
 119
 120         AC_MSG_RESULT([$kernelsrc])
 121         AC_MSG_CHECKING([kernel build directory])
 122         if test -z "$kernelbuild"; then
 123                 if test -d ${kernelsrc}-obj/`arch`/`arch`; then
 124                         kernelbuild=${kernelsrc}-obj/`arch`/`arch`
 125                 elif test -d ${kernelsrc}-obj/`arch`/default; then
 126                         kernelbuild=${kernelsrc}-obj/`arch`/default
 127                 elif test -d `dirname ${kernelsrc}`/build-`arch`; then
 128                         kernelbuild=`dirname ${kernelsrc}`/build-`arch`
 129                 else
 130                         kernelbuild=${kernelsrc}
 131                 fi
 132         fi
 133         AC_MSG_RESULT([$kernelbuild])
 134
 135         AC_MSG_CHECKING([kernel source version])
 136         if test -r $kernelbuild/include/linux/version.h &&
 137                 fgrep -q UTS_RELEASE $kernelbuild/include/linux/version.h; then
 138
 139                 kernsrcver=`(echo "#include <linux/version.h>";
 140                              echo "kernsrcver=UTS_RELEASE") |
 141                              cpp -I $kernelbuild/include |
 142                              grep "^kernsrcver=" | cut -d \" -f 2`
 143
 144         elif test -r $kernelbuild/include/linux/utsrelease.h &&
 145                 fgrep -q UTS_RELEASE $kernelbuild/include/linux/utsrelease.h; then
 146
 147                 kernsrcver=`(echo "#include <linux/utsrelease.h>";
 148                              echo "kernsrcver=UTS_RELEASE") |
 149                              cpp -I $kernelbuild/include |
 150                              grep "^kernsrcver=" | cut -d \" -f 2`
 151         fi
 152
 153         if test -z "$kernsrcver"; then
 154                 AC_MSG_RESULT([Not found])
 155                 AC_MSG_ERROR([
 156                 *** Cannot determine the version of the linux kernel source.
 157                 *** Please prepare the kernel before running this script])
 158         fi
 159
 160         AC_MSG_RESULT([$kernsrcver])
 161
 162         LINUX=${kernelsrc}
 163         LINUX_OBJ=${kernelbuild}
 164         LINUX_VERSION=${kernsrcver}
 165
 166         AC_SUBST(LINUX)
 167         AC_SUBST(LINUX_OBJ)
 168         AC_SUBST(LINUX_VERSION)
 169
 170         SPL_AC_MODULE_SYMVERS
 171 ])
 172
 173 dnl #
 174 dnl # Default SPL user configuration
 175 dnl #
 176 AC_DEFUN([SPL_AC_CONFIG_USER], [])
 177
 178 AC_DEFUN([SPL_AC_LICENSE], [
 179         AC_MSG_CHECKING([spl license])
 180         LICENSE=GPL
 181         AC_MSG_RESULT([$LICENSE])
 182         KERNELCPPFLAGS="${KERNELCPPFLAGS} -DHAVE_GPL_ONLY_SYMBOLS"
 183         AC_SUBST(LICENSE)
 184 ])
 185
 186 AC_DEFUN([SPL_AC_CONFIG], [
 187         SPL_CONFIG=all
 188         AC_ARG_WITH([config],
 189                 AS_HELP_STRING([--with-config=CONFIG],
 190                 [Config file 'kernel|user|all']),
 191                 [SPL_CONFIG="$withval"])
 192
 193         AC_MSG_CHECKING([spl config])
 194         AC_MSG_RESULT([$SPL_CONFIG]);
 195         AC_SUBST(SPL_CONFIG)
 196
 197         case "$SPL_CONFIG" in
 198                 kernel) SPL_AC_CONFIG_KERNEL ;;
 199                 user)   SPL_AC_CONFIG_USER   ;;
 200                 all)    SPL_AC_CONFIG_KERNEL
 201                         SPL_AC_CONFIG_USER   ;;
 202                 *)
 203                 AC_MSG_RESULT([Error!])
 204                 AC_MSG_ERROR([Bad value "$SPL_CONFIG" for --with-config,
 205                               user kernel|user|all]) ;;
 206         esac
 207
 208         AM_CONDITIONAL([CONFIG_USER],
 209                        [test "$SPL_CONFIG" = user] ||
 210                        [test "$SPL_CONFIG" = all])
 211         AM_CONDITIONAL([CONFIG_KERNEL],
 212                        [test "$SPL_CONFIG" = kernel] ||
 213                        [test "$SPL_CONFIG" = all])
 214 ])
 215
 216 AC_DEFUN([SPL_AC_DEBUG], [
 217         AC_MSG_CHECKING([whether debugging is enabled])
 218         AC_ARG_ENABLE( [debug],
 219                 AS_HELP_STRING([--enable-debug],
 220                 [Enable generic debug support (default off)]),
 221                 [ case "$enableval" in
 222                         yes) spl_ac_debug=yes ;;
 223                         no)  spl_ac_debug=no  ;;
 224                         *) AC_MSG_RESULT([Error!])
 225                         AC_MSG_ERROR([Bad value "$enableval" for --enable-debug]) ;;
 226                 esac ]
 227         )
 228         if test "$spl_ac_debug" = yes; then
 229                 AC_MSG_RESULT([yes])
 230                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG"
 231         else
 232                 AC_MSG_RESULT([no])
 233                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DNDEBUG"
 234         fi
 235 ])
 236
 237 AC_DEFUN([SPL_AC_DEBUG_KMEM], [
 238         AC_MSG_CHECKING([whether kmem debugging is enabled])
 239         AC_ARG_ENABLE( [debug-kmem],
 240                 AS_HELP_STRING([--enable-debug-kmem],
 241                 [Enable kmem debug support (default off)]),
 242                 [ case "$enableval" in
 243                         yes) spl_ac_debug_kmem=yes ;;
 244                         no)  spl_ac_debug_kmem=no  ;;
 245                         *) AC_MSG_RESULT([Error!])
 246                         AC_MSG_ERROR([Bad value "$enableval" for --enable-debug-kmem]) ;;
 247                 esac ]
 248         )
 249         if test "$spl_ac_debug_kmem" = yes; then
 250                 AC_MSG_RESULT([yes])
 251                 AC_DEFINE([DEBUG_KMEM], [1],
 252                 [Define to 1 to enable kmem debugging])
 253                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM"
 254         else
 255                 AC_MSG_RESULT([no])
 256         fi
 257 ])
 258
 259 AC_DEFUN([SPL_AC_DEBUG_MUTEX], [
 260         AC_MSG_CHECKING([whether mutex debugging is enabled])
 261         AC_ARG_ENABLE( [debug-mutex],
 262                 AS_HELP_STRING([--enable-debug-mutex],
 263                 [Enable mutex debug support (default off)]),
 264                 [ case "$enableval" in
 265                         yes) spl_ac_debug_mutex=yes ;;
 266                         no)  spl_ac_debug_mutex=no  ;;
 267                         *) AC_MSG_RESULT([Error!])
 268                         AC_MSG_ERROR([Bad value "$enableval" for --enable-debug-mutex]) ;;
 269                 esac ]
 270         )
 271         if test "$spl_ac_debug_mutex" = yes; then
 272                 AC_MSG_RESULT([yes])
 273                 AC_DEFINE([DEBUG_MUTEX], [1],
 274                 [Define to 1 to enable mutex debugging])
 275                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_MUTEX"
 276         else
 277                 AC_MSG_RESULT([no])
 278         fi
 279 ])
 280
 281 AC_DEFUN([SPL_AC_DEBUG_KSTAT], [
 282         AC_MSG_CHECKING([whether kstat debugging is enabled])
 283         AC_ARG_ENABLE( [debug-kstat],
 284                 AS_HELP_STRING([--enable-debug-kstat],
 285                 [Enable kstat debug support (default off)]),
 286                 [ case "$enableval" in
 287                         yes) spl_ac_debug_kstat=yes ;;
 288                         no)  spl_ac_debug_kstat=no  ;;
 289                         *) AC_MSG_RESULT([Error!])
 290                         AC_MSG_ERROR([Bad value "$enableval" for --enable-debug-kstat]) ;;
 291                 esac ]
 292         )
 293         if test "$spl_ac_debug_kstat" = yes; then
 294                 AC_MSG_RESULT([yes])
 295                 AC_DEFINE([DEBUG_KSTAT], [1],
 296                 [Define to 1 to enable kstat debugging])
 297                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KSTAT"
 298         else
 299                 AC_MSG_RESULT([no])
 300         fi
 301 ])
 302
 303 AC_DEFUN([SPL_AC_DEBUG_CALLB], [
 304         AC_MSG_CHECKING([whether callb debugging is enabled])
 305         AC_ARG_ENABLE( [debug-callb],
 306                 AS_HELP_STRING([--enable-debug-callb],
 307                 [Enable callb debug support (default off)]),
 308                 [ case "$enableval" in
 309                         yes) spl_ac_debug_callb=yes ;;
 310                         no)  spl_ac_debug_callb=no  ;;
 311                         *) AC_MSG_RESULT([Error!])
 312                         AC_MSG_ERROR([Bad value "$enableval" for --enable-debug-callb]) ;;
 313                 esac ]
 314         )
 315         if test "$spl_ac_debug_callb" = yes; then
 316                 AC_MSG_RESULT([yes])
 317                 AC_DEFINE([DEBUG_CALLB], [1],
 318                 [Define to 1 to enable callb debugging])
 319                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_CALLB"
 320         else
 321                 AC_MSG_RESULT([no])
 322         fi
 323 ])
 324
 325 dnl #
 326 dnl # SPL_LINUX_CONFTEST
 327 dnl #
 328 AC_DEFUN([SPL_LINUX_CONFTEST], [
 329 cat >conftest.c <<_ACEOF
 330 $1
 331 _ACEOF
 332 ])
 333
 334 dnl #
 335 dnl # SPL_LANG_PROGRAM(C)([PROLOGUE], [BODY])
 336 dnl #
 337 m4_define([SPL_LANG_PROGRAM], [
 338 $1
 339 int
 340 main (void)
 341 {
 342 dnl Do *not* indent the following line: there may be CPP directives.
 343 dnl Don't move the `;' right after for the same reason.
 344 $2
 345   ;
 346   return 0;
 347 }
 348 ])
 349
 350 dnl #
 351 dnl # SPL_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
 352 dnl #
 353 AC_DEFUN([SPL_LINUX_COMPILE_IFELSE], [
 354         m4_ifvaln([$1], [SPL_LINUX_CONFTEST([$1])])
 355         rm -Rf build && mkdir -p build
 356         echo "obj-m := conftest.o" >build/Makefile
 357         AS_IF(
 358                 [AC_TRY_COMMAND(cp conftest.c build && make [$2] -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build) >/dev/null && AC_TRY_COMMAND([$3])],
 359                 [$4],
 360                 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
 361         )
 362         rm -Rf build
 363 ])
 364
 365 dnl #
 366 dnl # SPL_LINUX_TRY_COMPILE like AC_TRY_COMPILE
 367 dnl #
 368 AC_DEFUN([SPL_LINUX_TRY_COMPILE],
 369         [SPL_LINUX_COMPILE_IFELSE(
 370         [AC_LANG_SOURCE([SPL_LANG_PROGRAM([[$1]], [[$2]])])],
 371         [modules],
 372         [test -s build/conftest.o],
 373         [$3], [$4])
 374 ])
 375
 376 dnl #
 377 dnl # SPL_LINUX_CONFIG
 378 dnl #
 379 AC_DEFUN([SPL_LINUX_CONFIG],
 380         [AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
 381         SPL_LINUX_TRY_COMPILE([
 382                 #ifndef AUTOCONF_INCLUDED
 383                 #include <linux/config.h>
 384                 #endif
 385         ],[
 386                 #ifndef CONFIG_$1
 387                 #error CONFIG_$1 not #defined
 388                 #endif
 389         ],[
 390                 AC_MSG_RESULT([yes])
 391                 $2
 392         ],[
 393                 AC_MSG_RESULT([no])
 394                 $3
 395         ])
 396 ])
 397
 398 dnl #
 399 dnl # SPL_CHECK_SYMBOL_EXPORT
 400 dnl # check symbol exported or not
 401 dnl #
 402 AC_DEFUN([SPL_CHECK_SYMBOL_EXPORT],
 403         [AC_MSG_CHECKING([whether symbol $1 is exported])
 404         grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
 405                 $LINUX_OBJ/Module*.symvers 2>/dev/null
 406         rc=$?
 407         if test $rc -ne 0; then
 408                 export=0
 409                 for file in $2; do
 410                         grep -q -E "EXPORT_SYMBOL.*($1)" \
 411                                 "$LINUX_OBJ/$file" 2>/dev/null
 412                         rc=$?
 413                         if test $rc -eq 0; then
 414                                 export=1
 415                                 break;
 416                         fi
 417                 done
 418                 if test $export -eq 0; then
 419                         AC_MSG_RESULT([no])
 420                         $4
 421                 else
 422                         AC_MSG_RESULT([yes])
 423                         $3
 424                 fi
 425         else
 426                 AC_MSG_RESULT([yes])
 427                 $3
 428         fi
 429 ])
 430
 431 dnl #
 432 dnl # SPL_CHECK_HEADER
 433 dnl # check whether header exists and define HAVE_$2_HEADER
 434 dnl #
 435 AC_DEFUN([SPL_CHECK_HEADER],
 436         [AC_MSG_CHECKING([whether header $1 exists])
 437         SPL_LINUX_TRY_COMPILE([
 438                 #include <$1>
 439         ],[
 440                 return 0;
 441         ],[
 442                 AC_DEFINE(HAVE_$2_HEADER, 1, [$1 exists])
 443                 AC_MSG_RESULT(yes)
 444                 $3
 445         ],[
 446                 AC_MSG_RESULT(no)
 447                 $4
 448         ])
 449 ])
 450
 451 dnl #
 452 dnl # 2.6.24 API change,
 453 dnl # check if uintptr_t typedef is defined
 454 dnl #
 455 AC_DEFUN([SPL_AC_TYPE_UINTPTR_T],
 456         [AC_MSG_CHECKING([whether kernel defines uintptr_t])
 457         SPL_LINUX_TRY_COMPILE([
 458                 #include <linux/types.h>
 459         ],[
 460                 uintptr_t *ptr;
 461         ],[
 462                 AC_MSG_RESULT([yes])
 463                 AC_DEFINE(HAVE_UINTPTR_T, 1,
 464                           [kernel defines uintptr_t])
 465         ],[
 466                 AC_MSG_RESULT([no])
 467         ])
 468 ])
 469
 470 dnl #
 471 dnl # 2.6.x API change,
 472 dnl # check if atomic64_t typedef is defined
 473 dnl #
 474 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_T],
 475         [AC_MSG_CHECKING([whether kernel defines atomic64_t])
 476         SPL_LINUX_TRY_COMPILE([
 477                 #include <asm/atomic.h>
 478         ],[
 479                 atomic64_t *ptr;
 480         ],[
 481                 AC_MSG_RESULT([yes])
 482                 AC_DEFINE(HAVE_ATOMIC64_T, 1,
 483                           [kernel defines atomic64_t])
 484         ],[
 485                 AC_MSG_RESULT([no])
 486         ])
 487 ])
 488
 489 dnl #
 490 dnl # 2.6.20 API change,
 491 dnl # INIT_WORK use 2 args and not store data inside
 492 dnl #
 493 AC_DEFUN([SPL_AC_3ARGS_INIT_WORK],
 494         [AC_MSG_CHECKING([whether INIT_WORK wants 3 args])
 495         SPL_LINUX_TRY_COMPILE([
 496                 #include <linux/workqueue.h>
 497         ],[
 498                 struct work_struct work;
 499                 INIT_WORK(&work, NULL, NULL);
 500         ],[
 501                 AC_MSG_RESULT(yes)
 502                 AC_DEFINE(HAVE_3ARGS_INIT_WORK, 1,
 503                           [INIT_WORK wants 3 args])
 504         ],[
 505                 AC_MSG_RESULT(no)
 506         ])
 507 ])
 508
 509 dnl #
 510 dnl # 2.6.21 API change,
 511 dnl # 'register_sysctl_table' use only one argument instead of two
 512 dnl #
 513 AC_DEFUN([SPL_AC_2ARGS_REGISTER_SYSCTL],
 514         [AC_MSG_CHECKING([whether register_sysctl_table() wants 2 args])
 515         SPL_LINUX_TRY_COMPILE([
 516                 #include <linux/sysctl.h>
 517         ],[
 518                 return register_sysctl_table(NULL,0);
 519         ],[
 520                 AC_MSG_RESULT(yes)
 521                 AC_DEFINE(HAVE_2ARGS_REGISTER_SYSCTL, 1,
 522                           [register_sysctl_table() wants 2 args])
 523         ],[
 524                 AC_MSG_RESULT(no)
 525         ])
 526 ])
 527
 528 dnl #
 529 dnl # 2.6.23 API change
 530 dnl # Old set_shrinker API replaced with register_shrinker
 531 dnl #
 532 AC_DEFUN([SPL_AC_SET_SHRINKER], [
 533         AC_MSG_CHECKING([whether set_shrinker() available])
 534         SPL_LINUX_TRY_COMPILE([
 535                 #include <linux/mm.h>
 536         ],[
 537                 return set_shrinker(DEFAULT_SEEKS, NULL);
 538         ],[
 539                 AC_MSG_RESULT([yes])
 540                 AC_DEFINE(HAVE_SET_SHRINKER, 1,
 541                           [set_shrinker() available])
 542         ],[
 543                 AC_MSG_RESULT([no])
 544         ])
 545 ])
 546
 547 dnl #
 548 dnl # 2.6.25 API change,
 549 dnl # struct path entry added to struct nameidata
 550 dnl #
 551 AC_DEFUN([SPL_AC_PATH_IN_NAMEIDATA],
 552         [AC_MSG_CHECKING([whether struct path used in struct nameidata])
 553         SPL_LINUX_TRY_COMPILE([
 554                 #include <linux/namei.h>
 555         ],[
 556                 struct nameidata nd;
 557
 558                 nd.path.mnt = NULL;
 559                 nd.path.dentry = NULL;
 560         ],[
 561                 AC_MSG_RESULT(yes)
 562                 AC_DEFINE(HAVE_PATH_IN_NAMEIDATA, 1,
 563                           [struct path used in struct nameidata])
 564         ],[
 565                 AC_MSG_RESULT(no)
 566         ])
 567 ])
 568
 569 dnl #
 570 dnl # Custom SPL patch may export this system it is not required
 571 dnl #
 572 AC_DEFUN([SPL_AC_TASK_CURR], [
 573         SPL_CHECK_SYMBOL_EXPORT([task_curr], [kernel/sched.c],
 574                 [AC_DEFINE(HAVE_TASK_CURR, 1, [task_curr() exported])],
 575                 [])
 576 ])
 577
 578 dnl #
 579 dnl # 2.6.19 API change,
 580 dnl # Use CTL_UNNUMBERED when binary sysctl is not required
 581 dnl #
 582 AC_DEFUN([SPL_AC_CTL_UNNUMBERED],
 583         [AC_MSG_CHECKING([whether unnumbered sysctl support exists])
 584         SPL_LINUX_TRY_COMPILE([
 585                 #include <linux/sysctl.h>
 586         ],[
 587                 #ifndef CTL_UNNUMBERED
 588                 #error CTL_UNNUMBERED undefined
 589                 #endif
 590         ],[
 591                 AC_MSG_RESULT(yes)
 592                 AC_DEFINE(HAVE_CTL_UNNUMBERED, 1,
 593                           [unnumbered sysctl support exists])
 594         ],[
 595                 AC_MSG_RESULT(no)
 596         ])
 597 ])
 598
 599 dnl #
 600 dnl # 2.6.16 API change.
 601 dnl # Check if 'fls64()' is available
 602 dnl #
 603 AC_DEFUN([SPL_AC_FLS64],
 604         [AC_MSG_CHECKING([whether fls64() is available])
 605         SPL_LINUX_TRY_COMPILE([
 606                 #include <linux/bitops.h>
 607         ],[
 608                 return fls64(0);
 609         ],[
 610                 AC_MSG_RESULT(yes)
 611                 AC_DEFINE(HAVE_FLS64, 1, [fls64() is available])
 612         ],[
 613                 AC_MSG_RESULT(no)
 614         ])
 615 ])
 616
 617 dnl #
 618 dnl # 2.6.18 API change, check whether device_create() is available.
 619 dnl # Device_create() was introduced in 2.6.18 and depricated
 620 dnl # class_device_create() which was fully removed in 2.6.26.
 621 dnl #
 622 AC_DEFUN([SPL_AC_DEVICE_CREATE], [
 623         SPL_CHECK_SYMBOL_EXPORT(
 624                 [device_create],
 625                 [drivers/base/core.c],
 626                 [AC_DEFINE(HAVE_DEVICE_CREATE, 1,
 627                 [device_create() is available])],
 628                 [])
 629 ])
 630
 631 dnl #
 632 dnl # 2.6.27 API change,
 633 dnl # device_create() uses 5 args, new 'drvdata' argument.
 634 dnl #
 635 AC_DEFUN([SPL_AC_5ARGS_DEVICE_CREATE], [
 636         AC_MSG_CHECKING([whether device_create() wants 5 args])
 637         tmp_flags="$EXTRA_KCFLAGS"
 638         EXTRA_KCFLAGS="-Werror"
 639         SPL_LINUX_TRY_COMPILE([
 640                 #include <linux/device.h>
 641         ],[
 642                 device_create(NULL, NULL, 0, NULL, "%d", 1);
 643         ],[
 644                 AC_MSG_RESULT(yes)
 645                 AC_DEFINE(HAVE_5ARGS_DEVICE_CREATE, 1,
 646                           [device_create wants 5 args])
 647         ],[
 648                 AC_MSG_RESULT(no)
 649         ])
 650         EXTRA_KCFLAGS="$tmp_flags"
 651 ])
 652
 653 dnl #
 654 dnl # 2.6.13 API change, check whether class_device_create() is available.
 655 dnl # Class_device_create() was introduced in 2.6.13 and depricated
 656 dnl # class_simple_device_add() which was fully removed in 2.6.13.
 657 dnl #
 658 AC_DEFUN([SPL_AC_CLASS_DEVICE_CREATE], [
 659         SPL_CHECK_SYMBOL_EXPORT(
 660                 [class_device_create],
 661                 [drivers/base/class.c],
 662                 [AC_DEFINE(HAVE_CLASS_DEVICE_CREATE, 1,
 663                 [class_device_create() is available])],
 664                 [])
 665 ])
 666
 667 dnl #
 668 dnl # 2.6.26 API change, set_normalized_timespec() is exported.
 669 dnl #
 670 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT], [
 671         SPL_CHECK_SYMBOL_EXPORT(
 672                 [set_normalized_timespec],
 673                 [kernel/time.c],
 674                 [AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_EXPORT, 1,
 675                 [set_normalized_timespec() is available as export])],
 676                 [])
 677 ])
 678
 679 dnl #
 680 dnl # 2.6.16 API change, set_normalize_timespec() moved to time.c
 681 dnl # previously it was available in time.h as an inline.
 682 dnl #
 683 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE], [
 684         AC_MSG_CHECKING([whether set_normalized_timespec() is an inline])
 685         SPL_LINUX_TRY_COMPILE([
 686                 #include <linux/time.h>
 687                 void set_normalized_timespec(struct timespec *ts,
 688                                              time_t sec, long nsec) { }
 689         ],
 690         [],
 691         [
 692                 AC_MSG_RESULT(no)
 693         ],[
 694                 AC_MSG_RESULT(yes)
 695                 AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_INLINE, 1,
 696                           [set_normalized_timespec() is available as inline])
 697         ])
 698 ])
 699
 700 dnl #
 701 dnl # 2.6.18 API change,
 702 dnl # timespec_sub() inline function available in linux/time.h
 703 dnl #
 704 AC_DEFUN([SPL_AC_TIMESPEC_SUB], [
 705         AC_MSG_CHECKING([whether timespec_sub() is available])
 706         SPL_LINUX_TRY_COMPILE([
 707                 #include <linux/time.h>
 708         ],[
 709                 struct timespec a, b, c = { 0 };
 710                 c = timespec_sub(a, b);
 711         ],[
 712                 AC_MSG_RESULT(yes)
 713                 AC_DEFINE(HAVE_TIMESPEC_SUB, 1, [timespec_sub() is available])
 714         ],[
 715                 AC_MSG_RESULT(no)
 716         ])
 717 ])
 718
 719 dnl #
 720 dnl # 2.6.19 API change,
 721 dnl # check if init_utsname() is available in linux/utsname.h
 722 dnl #
 723 AC_DEFUN([SPL_AC_INIT_UTSNAME], [
 724         AC_MSG_CHECKING([whether init_utsname() is available])
 725         SPL_LINUX_TRY_COMPILE([
 726                 #include <linux/utsname.h>
 727         ],[
 728                 struct new_utsname *a = init_utsname();
 729         ],[
 730                 AC_MSG_RESULT(yes)
 731                 AC_DEFINE(HAVE_INIT_UTSNAME, 1, [init_utsname() is available])
 732         ],[
 733                 AC_MSG_RESULT(no)
 734         ])
 735 ])
 736
 737 dnl #
 738 dnl # 2.6.26 API change,
 739 dnl # definition of struct fdtable relocated to linux/fdtable.h
 740 dnl #
 741 AC_DEFUN([SPL_AC_FDTABLE_HEADER], [
 742         SPL_CHECK_HEADER([linux/fdtable.h], [FDTABLE], [], [])
 743 ])
 744
 745 dnl #
 746 dnl # 2.6.14 API change,
 747 dnl # check whether 'files_fdtable()' exists
 748 dnl #
 749 AC_DEFUN([SPL_AC_FILES_FDTABLE], [
 750         AC_MSG_CHECKING([whether files_fdtable() is available])
 751         SPL_LINUX_TRY_COMPILE([
 752                 #include <linux/sched.h>
 753                 #include <linux/file.h>
 754                 #ifdef HAVE_FDTABLE_HEADER
 755                 #include <linux/fdtable.h>
 756                 #endif
 757         ],[
 758                 struct files_struct *files = current->files;
 759                 struct fdtable *fdt = files_fdtable(files);
 760         ],[
 761                 AC_MSG_RESULT(yes)
 762                 AC_DEFINE(HAVE_FILES_FDTABLE, 1, [files_fdtable() is available])
 763         ],[
 764                 AC_MSG_RESULT(no)
 765         ])
 766 ])
 767
 768 dnl #
 769 dnl # 2.6.18 API change,
 770 dnl # added linux/uaccess.h
 771 dnl #
 772 AC_DEFUN([SPL_AC_UACCESS_HEADER], [
 773         SPL_CHECK_HEADER([linux/uaccess.h], [UACCESS], [], [])
 774 ])
 775
 776 dnl #
 777 dnl # 2.6.12 API change,
 778 dnl # check whether 'kmalloc_node()' is available.
 779 dnl #
 780 AC_DEFUN([SPL_AC_KMALLOC_NODE], [
 781         AC_MSG_CHECKING([whether kmalloc_node() is available])
 782         SPL_LINUX_TRY_COMPILE([
 783                 #include <linux/slab.h>
 784         ],[
 785                 void *a = kmalloc_node(1, GFP_KERNEL, 0);
 786         ],[
 787                 AC_MSG_RESULT(yes)
 788                 AC_DEFINE(HAVE_KMALLOC_NODE, 1, [kmalloc_node() is available])
 789         ],[
 790                 AC_MSG_RESULT(no)
 791         ])
 792 ])
 793
 794 dnl #
 795 dnl # 2.6.9 API change,
 796 dnl # check whether 'monotonic_clock()' is available it may
 797 dnl # be available for some archs but not others.
 798 dnl #
 799 AC_DEFUN([SPL_AC_MONOTONIC_CLOCK], [
 800         SPL_CHECK_SYMBOL_EXPORT(
 801                 [monotonic_clock],
 802                 [],
 803                 [AC_DEFINE(HAVE_MONOTONIC_CLOCK, 1,
 804                 [monotonic_clock() is available])],
 805                 [])
 806 ])
 807
 808 dnl #
 809 dnl # 2.6.16 API change,
 810 dnl # check whether 'struct inode' has i_mutex
 811 dnl #
 812 AC_DEFUN([SPL_AC_INODE_I_MUTEX], [
 813         AC_MSG_CHECKING([whether struct inode has i_mutex])
 814         SPL_LINUX_TRY_COMPILE([
 815                 #include <linux/fs.h>
 816                 #include <linux/mutex.h>
 817         ],[
 818                 struct inode i;
 819                 mutex_init(&i.i_mutex);
 820         ],[
 821                 AC_MSG_RESULT(yes)
 822                 AC_DEFINE(HAVE_INODE_I_MUTEX, 1, [struct inode has i_mutex])
 823         ],[
 824                 AC_MSG_RESULT(no)
 825         ])
 826 ])
 827
 828 dnl #
 829 dnl # 2.6.18 API change,
 830 dnl # First introduced 'mutex_lock_nested()' in include/linux/mutex.h,
 831 dnl # as part of the mutex validator.  Fallback to using 'mutex_lock()'
 832 dnl # if the mutex validator is disabled or otherwise unavailable.
 833 dnl #
 834 AC_DEFUN([SPL_AC_MUTEX_LOCK_NESTED], [
 835         AC_MSG_CHECKING([whether mutex_lock_nested() is available])
 836         SPL_LINUX_TRY_COMPILE([
 837                 #include <linux/mutex.h>
 838         ],[
 839                 struct mutex mutex;
 840                 mutex_init(&mutex);
 841                 mutex_lock_nested(&mutex, 0);
 842         ],[
 843                 AC_MSG_RESULT(yes)
 844                 AC_DEFINE(HAVE_MUTEX_LOCK_NESTED, 1,
 845                 [mutex_lock_nested() is available])
 846         ],[
 847                 AC_MSG_RESULT(no)
 848         ])
 849 ])
 850
 851 dnl #
 852 dnl # 2.6.22 API change,
 853 dnl # First introduced 'div64_64()' in lib/div64.c
 854 dnl
 855 AC_DEFUN([SPL_AC_DIV64_64], [
 856         SPL_CHECK_SYMBOL_EXPORT(
 857                 [div64_64],
 858                 [],
 859                 [AC_DEFINE(HAVE_DIV64_64, 1,
 860                 [div64_64() is available])],
 861                 [])
 862 ])
 863
 864 dnl #
 865 dnl # 2.6.26 API change,
 866 dnl # Renamed 'div64_64()' to 'div64_u64' in lib/div64.c
 867 dnl #
 868 AC_DEFUN([SPL_AC_DIV64_U64], [
 869         SPL_CHECK_SYMBOL_EXPORT(
 870                 [div64_u64],
 871                 [],
 872                 [AC_DEFINE(HAVE_DIV64_U64, 1,
 873                 [div64_u64() is available])],
 874                 [])
 875 ])
 876
 877 dnl #
 878 dnl # 2.6.27 API change,
 879 dnl # on_each_cpu() uses 3 args, no 'retry' argument
 880 dnl #
 881 AC_DEFUN([SPL_AC_3ARGS_ON_EACH_CPU], [
 882         AC_MSG_CHECKING([whether on_each_cpu() wants 3 args])
 883         SPL_LINUX_TRY_COMPILE([
 884                 #include <linux/smp.h>
 885         ],[
 886                 on_each_cpu(NULL, NULL, 0);
 887         ],[
 888                 AC_MSG_RESULT(yes)
 889                 AC_DEFINE(HAVE_3ARGS_ON_EACH_CPU, 1,
 890                           [on_each_cpu wants 3 args])
 891         ],[
 892                 AC_MSG_RESULT(no)
 893         ])
 894 ])
 895
 896 dnl #
 897 dnl # 2.6.18 API change,
 898 dnl # kallsyms_lookup_name no longer exported
 899 dnl #
 900 AC_DEFUN([SPL_AC_KALLSYMS_LOOKUP_NAME], [
 901         SPL_CHECK_SYMBOL_EXPORT(
 902                 [kallsyms_lookup_name],
 903                 [],
 904                 [AC_DEFINE(HAVE_KALLSYMS_LOOKUP_NAME, 1,
 905                 [kallsyms_lookup_name() is available])],
 906                 [])
 907 ])
 908
 909 dnl #
 910 dnl # Proposed API change,
 911 dnl # This symbol is not available in stock kernels.  You may build a
 912 dnl # custom kernel with the *-spl-export-symbols.patch which will export
 913 dnl # these symbols for use.  If your already rolling a custom kernel for
 914 dnl # your environment this is recommended.
 915 dnl #
 916 AC_DEFUN([SPL_AC_GET_VMALLOC_INFO], [
 917         SPL_CHECK_SYMBOL_EXPORT(
 918                 [get_vmalloc_info],
 919                 [],
 920                 [AC_DEFINE(HAVE_GET_VMALLOC_INFO, 1,
 921                 [get_vmalloc_info() is available])],
 922                 [])
 923 ])
 924
 925 dnl #
 926 dnl # 2.6.17 API change
 927 dnl # The helper functions first_online_pgdat(), next_online_pgdat(), and
 928 dnl # next_zone() are introduced to simplify for_each_zone().  These symbols
 929 dnl # were exported in 2.6.17 for use by modules which was consistent with
 930 dnl # the previous implementation of for_each_zone().  From 2.6.18 - 2.6.19
 931 dnl # the symbols were exported as 'unused', and by 2.6.20 they exports
 932 dnl # were dropped entirely leaving modules no way to directly iterate over
 933 dnl # the zone list.  Because we need access to the zone helpers we check
 934 dnl # if the kernel contains the old or new implementation.  Then we check
 935 dnl # to see if the symbols we need for each version are available.  If they
 936 dnl # are not, dynamically aquire the addresses with kallsyms_lookup_name().
 937 dnl #
 938 AC_DEFUN([SPL_AC_PGDAT_HELPERS], [
 939         AC_MSG_CHECKING([whether symbol *_pgdat exist])
 940         grep -q -E 'first_online_pgdat' $LINUX/include/linux/mmzone.h 2>/dev/null
 941         rc=$?
 942         if test $rc -eq 0; then
 943                 AC_MSG_RESULT([yes])
 944                 AC_DEFINE(HAVE_PGDAT_HELPERS, 1, [pgdat helpers are available])
 945         else
 946                 AC_MSG_RESULT([no])
 947         fi
 948 ])
 949
 950 dnl #
 951 dnl # Proposed API change,
 952 dnl # This symbol is not available in stock kernels.  You may build a
 953 dnl # custom kernel with the *-spl-export-symbols.patch which will export
 954 dnl # these symbols for use.  If your already rolling a custom kernel for
 955 dnl # your environment this is recommended.
 956 dnl #
 957 AC_DEFUN([SPL_AC_FIRST_ONLINE_PGDAT], [
 958         SPL_CHECK_SYMBOL_EXPORT(
 959                 [first_online_pgdat],
 960                 [],
 961                 [AC_DEFINE(HAVE_FIRST_ONLINE_PGDAT, 1,
 962                 [first_online_pgdat() is available])],
 963                 [])
 964 ])
 965
 966 dnl #
 967 dnl # Proposed API change,
 968 dnl # This symbol is not available in stock kernels.  You may build a
 969 dnl # custom kernel with the *-spl-export-symbols.patch which will export
 970 dnl # these symbols for use.  If your already rolling a custom kernel for
 971 dnl # your environment this is recommended.
 972 dnl #
 973 AC_DEFUN([SPL_AC_NEXT_ONLINE_PGDAT], [
 974         SPL_CHECK_SYMBOL_EXPORT(
 975                 [next_online_pgdat],
 976                 [],
 977                 [AC_DEFINE(HAVE_NEXT_ONLINE_PGDAT, 1,
 978                 [next_online_pgdat() is available])],
 979                 [])
 980 ])
 981
 982 dnl #
 983 dnl # Proposed API change,
 984 dnl # This symbol is not available in stock kernels.  You may build a
 985 dnl # custom kernel with the *-spl-export-symbols.patch which will export
 986 dnl # these symbols for use.  If your already rolling a custom kernel for
 987 dnl # your environment this is recommended.
 988 dnl #
 989 AC_DEFUN([SPL_AC_NEXT_ZONE], [
 990         SPL_CHECK_SYMBOL_EXPORT(
 991                 [next_zone],
 992                 [],
 993                 [AC_DEFINE(HAVE_NEXT_ZONE, 1,
 994                 [next_zone() is available])],
 995                 [])
 996 ])
 997
 998 dnl #
 999 dnl # 2.6.17 API change,
1000 dnl # See SPL_AC_PGDAT_HELPERS for details.
1001 dnl #
1002 AC_DEFUN([SPL_AC_PGDAT_LIST], [
1003         SPL_CHECK_SYMBOL_EXPORT(
1004                 [pgdat_list],
1005                 [],
1006                 [AC_DEFINE(HAVE_PGDAT_LIST, 1,
1007                 [pgdat_list is available])],
1008                 [])
1009 ])
1010
1011 dnl #
1012 dnl # 2.6.18 API change,
1013 dnl # First introduced global_page_state() support as an inline.
1014 dnl #
1015 AC_DEFUN([SPL_AC_GLOBAL_PAGE_STATE], [
1016         AC_MSG_CHECKING([whether global_page_state() is available])
1017         SPL_LINUX_TRY_COMPILE([
1018                 #include <linux/mm.h>
1019         ],[
1020                 unsigned long state;
1021                 state = global_page_state(0);
1022         ],[
1023                 AC_MSG_RESULT(yes)
1024                 AC_DEFINE(HAVE_GLOBAL_PAGE_STATE, 1,
1025                           [global_page_state() is available])
1026         ],[
1027                 AC_MSG_RESULT(no)
1028         ])
1029 ])
1030
1031 dnl #
1032 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1033 dnl # Public global zone stats now include a free page count.  However
1034 dnl # the enumerated names of the counters have changed since this API
1035 dnl # was introduced.  We need to deduce the corrent name to use.  This
1036 dnl # replaces the priviate get_zone_counts() interface.
1037 dnl #
1038 dnl # NR_FREE_PAGES was available from 2.6.21 to current kernels, which
1039 dnl # is 2.6.30 as of when this was written.
1040 dnl #
1041 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_FREE], [
1042         AC_MSG_CHECKING([whether page state NR_FREE_PAGES is available])
1043         SPL_LINUX_TRY_COMPILE([
1044                 #include <linux/mm.h>
1045         ],[
1046                 enum zone_stat_item zsi;
1047                 zsi = NR_FREE_PAGES;
1048         ],[
1049                 AC_MSG_RESULT(yes)
1050                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES, 1,
1051                           [Page state NR_FREE_PAGES is available])
1052         ],[
1053                 AC_MSG_RESULT(no)
1054         ])
1055 ])
1056
1057 dnl #
1058 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1059 dnl # Public global zone stats now include an inactive page count.  However
1060 dnl # the enumerated names of the counters have changed since this API
1061 dnl # was introduced.  We need to deduce the corrent name to use.  This
1062 dnl # replaces the priviate get_zone_counts() interface.
1063 dnl #
1064 dnl # NR_INACTIVE was available from 2.6.21 to 2.6.27 and included both
1065 dnl # anonymous and file inactive pages.  As of 2.6.28 it was split in
1066 dnl # to NR_INACTIVE_ANON and NR_INACTIVE_FILE.
1067 dnl #
1068 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_INACTIVE], [
1069         AC_MSG_CHECKING([whether page state NR_INACTIVE is available])
1070         SPL_LINUX_TRY_COMPILE([
1071                 #include <linux/mm.h>
1072         ],[
1073                 enum zone_stat_item zsi;
1074                 zsi = NR_INACTIVE;
1075         ],[
1076                 AC_MSG_RESULT(yes)
1077                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE, 1,
1078                           [Page state NR_INACTIVE is available])
1079         ],[
1080                 AC_MSG_RESULT(no)
1081         ])
1082
1083         AC_MSG_CHECKING([whether page state NR_INACTIVE_ANON is available])
1084         SPL_LINUX_TRY_COMPILE([
1085                 #include <linux/mm.h>
1086         ],[
1087                 enum zone_stat_item zsi;
1088                 zsi = NR_INACTIVE_ANON;
1089         ],[
1090                 AC_MSG_RESULT(yes)
1091                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON, 1,
1092                           [Page state NR_INACTIVE_ANON is available])
1093         ],[
1094                 AC_MSG_RESULT(no)
1095         ])
1096
1097         AC_MSG_CHECKING([whether page state NR_INACTIVE_FILE is available])
1098         SPL_LINUX_TRY_COMPILE([
1099                 #include <linux/mm.h>
1100         ],[
1101                 enum zone_stat_item zsi;
1102                 zsi = NR_INACTIVE_FILE;
1103         ],[
1104                 AC_MSG_RESULT(yes)
1105                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE, 1,
1106                           [Page state NR_INACTIVE_FILE is available])
1107         ],[
1108                 AC_MSG_RESULT(no)
1109         ])
1110 ])
1111
1112 dnl #
1113 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1114 dnl # Public global zone stats now include an active page count.  However
1115 dnl # the enumerated names of the counters have changed since this API
1116 dnl # was introduced.  We need to deduce the corrent name to use.  This
1117 dnl # replaces the priviate get_zone_counts() interface.
1118 dnl #
1119 dnl # NR_ACTIVE was available from 2.6.21 to 2.6.27 and included both
1120 dnl # anonymous and file active pages.  As of 2.6.28 it was split in
1121 dnl # to NR_ACTIVE_ANON and NR_ACTIVE_FILE.
1122 dnl #
1123 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_ACTIVE], [
1124         AC_MSG_CHECKING([whether page state NR_ACTIVE is available])
1125         SPL_LINUX_TRY_COMPILE([
1126                 #include <linux/mm.h>
1127         ],[
1128                 enum zone_stat_item zsi;
1129                 zsi = NR_ACTIVE;
1130         ],[
1131                 AC_MSG_RESULT(yes)
1132                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE, 1,
1133                           [Page state NR_ACTIVE is available])
1134         ],[
1135                 AC_MSG_RESULT(no)
1136         ])
1137
1138         AC_MSG_CHECKING([whether page state NR_ACTIVE_ANON is available])
1139         SPL_LINUX_TRY_COMPILE([
1140                 #include <linux/mm.h>
1141         ],[
1142                 enum zone_stat_item zsi;
1143                 zsi = NR_ACTIVE_ANON;
1144         ],[
1145                 AC_MSG_RESULT(yes)
1146                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON, 1,
1147                           [Page state NR_ACTIVE_ANON is available])
1148         ],[
1149                 AC_MSG_RESULT(no)
1150         ])
1151
1152         AC_MSG_CHECKING([whether page state NR_ACTIVE_FILE is available])
1153         SPL_LINUX_TRY_COMPILE([
1154                 #include <linux/mm.h>
1155         ],[
1156                 enum zone_stat_item zsi;
1157                 zsi = NR_ACTIVE_FILE;
1158         ],[
1159                 AC_MSG_RESULT(yes)
1160                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE, 1,
1161                           [Page state NR_ACTIVE_FILE is available])
1162         ],[
1163                 AC_MSG_RESULT(no)
1164         ])
1165 ])
1166
1167 dnl #
1168 dnl # Proposed API change for legacy kernels.
1169 dnl # This symbol is not available in older kernels.  For kernels post
1170 dnl # 2.6.21 the global_page_state() API is used to get free/inactive/active
1171 dnl # page state information.  This symbol is only used in legacy kernels
1172 dnl # any only as a last resort.
1173 dnl
1174 AC_DEFUN([SPL_AC_GET_ZONE_COUNTS], [
1175         AC_MSG_CHECKING([whether symbol get_zone_counts is needed])
1176         SPL_LINUX_TRY_COMPILE([
1177         ],[
1178                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES)
1179                 #error "global_page_state needs NR_FREE_PAGES"
1180                 #endif
1181
1182                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE) && \
1183                     !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON) && \
1184                     !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE)
1185                 #error "global_page_state needs NR_ACTIVE*"
1186                 #endif
1187
1188                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE) && \
1189                     !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON) && \
1190                     !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE)
1191                 #error "global_page_state needs NR_INACTIVE*"
1192                 #endif
1193         ],[
1194                 AC_MSG_RESULT(no)
1195         ],[
1196                 AC_MSG_RESULT(yes)
1197                 AC_DEFINE(NEED_GET_ZONE_COUNTS, 1,
1198                           [get_zone_counts() is needed])
1199
1200                 SPL_CHECK_SYMBOL_EXPORT(
1201                         [get_zone_counts],
1202                         [],
1203                         [AC_DEFINE(HAVE_GET_ZONE_COUNTS, 1,
1204                         [get_zone_counts() is available])],
1205                         [])
1206         ])
1207 ])
1208
1209 dnl #
1210 dnl # SLES API change, never adopted in mainline,
1211 dnl # Third 'struct vfsmount *' argument removed.
1212 dnl #
1213 AC_DEFUN([SPL_AC_2ARGS_VFS_UNLINK],
1214         [AC_MSG_CHECKING([whether vfs_unlink() wants 2 args])
1215         SPL_LINUX_TRY_COMPILE([
1216                 #include <linux/fs.h>
1217         ],[
1218                 vfs_unlink(NULL, NULL);
1219         ],[
1220                 AC_MSG_RESULT(yes)
1221                 AC_DEFINE(HAVE_2ARGS_VFS_UNLINK, 1,
1222                           [vfs_unlink() wants 2 args])
1223         ],[
1224                 AC_MSG_RESULT(no)
1225         ])
1226 ])
1227
1228 dnl #
1229 dnl # SLES API change, never adopted in mainline,
1230 dnl # Third and sixth 'struct vfsmount *' argument removed.
1231 dnl #
1232 AC_DEFUN([SPL_AC_4ARGS_VFS_RENAME],
1233         [AC_MSG_CHECKING([whether vfs_rename() wants 4 args])
1234         SPL_LINUX_TRY_COMPILE([
1235                 #include <linux/fs.h>
1236         ],[
1237                 vfs_rename(NULL, NULL, NULL, NULL);
1238         ],[
1239                 AC_MSG_RESULT(yes)
1240                 AC_DEFINE(HAVE_4ARGS_VFS_RENAME, 1,
1241                           [vfs_rename() wants 4 args])
1242         ],[
1243                 AC_MSG_RESULT(no)
1244         ])
1245 ])
1246
1247 dnl #
1248 dnl # 2.6.29 API change,
1249 dnl # check whether 'struct cred' exists
1250 dnl #
1251 AC_DEFUN([SPL_AC_CRED_STRUCT], [
1252         AC_MSG_CHECKING([whether struct cred exists])
1253         SPL_LINUX_TRY_COMPILE([
1254                 #include <linux/cred.h>
1255         ],[
1256                 struct cred *cr;
1257                 cr  = NULL;
1258         ],[
1259                 AC_MSG_RESULT(yes)
1260                 AC_DEFINE(HAVE_CRED_STRUCT, 1, [struct cred exists])
1261         ],[
1262                 AC_MSG_RESULT(no)
1263         ])
1264 ])
1265
1266 dnl #
1267 dnl # Custom SPL patch may export this symbol.
1268 dnl #
1269 AC_DEFUN([SPL_AC_GROUPS_SEARCH], [
1270         SPL_CHECK_SYMBOL_EXPORT(
1271                 [groups_search],
1272                 [],
1273                 [AC_DEFINE(HAVE_GROUPS_SEARCH, 1,
1274                 [groups_search() is available])],
1275                 [])
1276 ])
1277
1278 dnl #
1279 dnl # 2.6.x API change,
1280 dnl # __put_task_struct() was exported in RHEL5 but unavailable elsewhere.
1281 dnl #
1282 AC_DEFUN([SPL_AC_PUT_TASK_STRUCT], [
1283         SPL_CHECK_SYMBOL_EXPORT(
1284                 [__put_task_struct],
1285                 [],
1286                 [AC_DEFINE(HAVE_PUT_TASK_STRUCT, 1,
1287                 [__put_task_struct() is available])],
1288                 [])
1289 ])