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_KMEM_TRACKING
  27         SPL_AC_ATOMIC_SPINLOCK
  28         SPL_AC_TYPE_ATOMIC64_CMPXCHG
  29         SPL_AC_TYPE_ATOMIC64_XCHG
  30         SPL_AC_TYPE_UINTPTR_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_OWNER
  52         SPL_AC_MUTEX_LOCK_NESTED
  53         SPL_AC_DIV64_64
  54         SPL_AC_DIV64_U64
  55         SPL_AC_3ARGS_ON_EACH_CPU
  56         SPL_AC_KALLSYMS_LOOKUP_NAME
  57         SPL_AC_GET_VMALLOC_INFO
  58         SPL_AC_PGDAT_HELPERS
  59         SPL_AC_FIRST_ONLINE_PGDAT
  60         SPL_AC_NEXT_ONLINE_PGDAT
  61         SPL_AC_NEXT_ZONE
  62         SPL_AC_PGDAT_LIST
  63         SPL_AC_GLOBAL_PAGE_STATE
  64         SPL_AC_ZONE_STAT_ITEM_FREE
  65         SPL_AC_ZONE_STAT_ITEM_INACTIVE
  66         SPL_AC_ZONE_STAT_ITEM_ACTIVE
  67         SPL_AC_GET_ZONE_COUNTS
  68         SPL_AC_SET_FS_PWD
  69         SPL_AC_2ARGS_SET_FS_PWD
  70         SPL_AC_2ARGS_VFS_UNLINK
  71         SPL_AC_4ARGS_VFS_RENAME
  72         SPL_AC_CRED_STRUCT
  73         SPL_AC_GROUPS_SEARCH
  74         SPL_AC_PUT_TASK_STRUCT
  75         SPL_AC_5ARGS_PROC_HANDLER
  76 ])
  77
  78 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
  79         modpost=$LINUX/scripts/Makefile.modpost
  80         AC_MSG_CHECKING([kernel file name for module symbols])
  81         if test -f "$modpost"; then
  82                 if grep -q Modules.symvers $modpost; then
  83                         LINUX_SYMBOLS=Modules.symvers
  84                 else
  85                         LINUX_SYMBOLS=Module.symvers
  86                 fi
  87         else
  88                 LINUX_SYMBOLS=NONE
  89         fi
  90         AC_MSG_RESULT($LINUX_SYMBOLS)
  91         AC_SUBST(LINUX_SYMBOLS)
  92 ])
  93
  94 AC_DEFUN([SPL_AC_KERNEL], [
  95         AC_ARG_WITH([linux],
  96                 AS_HELP_STRING([--with-linux=PATH],
  97                 [Path to kernel source]),
  98                 [kernelsrc="$withval"])
  99
 100         AC_ARG_WITH([linux-obj],
 101                 AS_HELP_STRING([--with-linux-obj=PATH],
 102                 [Path to kernel build objects]),
 103                 [kernelbuild="$withval"])
 104
 105         AC_MSG_CHECKING([kernel source directory])
 106         if test -z "$kernelsrc"; then
 107                 sourcelink=`ls -1d /usr/src/kernels/* /usr/src/linux-* \
 108                             2>/dev/null | grep -v obj | tail -1`
 109
 110                 if test -e ${sourcelink}; then
 111                         kernelsrc=`readlink -f ${sourcelink}`
 112                 else
 113                         AC_MSG_RESULT([Not found])
 114                         AC_MSG_ERROR([
 115                         *** Please specify the location of the kernel source
 116                         *** with the '--with-linux=PATH' option])
 117                 fi
 118         else
 119                 if test "$kernelsrc" = "NONE"; then
 120                         kernsrcver=NONE
 121                 fi
 122         fi
 123
 124         AC_MSG_RESULT([$kernelsrc])
 125         AC_MSG_CHECKING([kernel build directory])
 126         if test -z "$kernelbuild"; then
 127                 if test -d ${kernelsrc}-obj/`arch`/`arch`; then
 128                         kernelbuild=${kernelsrc}-obj/`arch`/`arch`
 129                 elif test -d ${kernelsrc}-obj/`arch`/default; then
 130                         kernelbuild=${kernelsrc}-obj/`arch`/default
 131                 elif test -d `dirname ${kernelsrc}`/build-`arch`; then
 132                         kernelbuild=`dirname ${kernelsrc}`/build-`arch`
 133                 else
 134                         kernelbuild=${kernelsrc}
 135                 fi
 136         fi
 137         AC_MSG_RESULT([$kernelbuild])
 138
 139         AC_MSG_CHECKING([kernel source version])
 140         if test -r $kernelbuild/include/linux/version.h &&
 141                 fgrep -q UTS_RELEASE $kernelbuild/include/linux/version.h; then
 142
 143                 kernsrcver=`(echo "#include <linux/version.h>";
 144                              echo "kernsrcver=UTS_RELEASE") |
 145                              cpp -I $kernelbuild/include |
 146                              grep "^kernsrcver=" | cut -d \" -f 2`
 147
 148         elif test -r $kernelbuild/include/linux/utsrelease.h &&
 149                 fgrep -q UTS_RELEASE $kernelbuild/include/linux/utsrelease.h; then
 150
 151                 kernsrcver=`(echo "#include <linux/utsrelease.h>";
 152                              echo "kernsrcver=UTS_RELEASE") |
 153                              cpp -I $kernelbuild/include |
 154                              grep "^kernsrcver=" | cut -d \" -f 2`
 155         fi
 156
 157         if test -z "$kernsrcver"; then
 158                 AC_MSG_RESULT([Not found])
 159                 AC_MSG_ERROR([
 160                 *** Cannot determine the version of the linux kernel source.
 161                 *** Please prepare the kernel before running this script])
 162         fi
 163
 164         AC_MSG_RESULT([$kernsrcver])
 165
 166         LINUX=${kernelsrc}
 167         LINUX_OBJ=${kernelbuild}
 168         LINUX_VERSION=${kernsrcver}
 169
 170         AC_SUBST(LINUX)
 171         AC_SUBST(LINUX_OBJ)
 172         AC_SUBST(LINUX_VERSION)
 173
 174         SPL_AC_MODULE_SYMVERS
 175 ])
 176
 177 dnl #
 178 dnl # Default SPL user configuration
 179 dnl #
 180 AC_DEFUN([SPL_AC_CONFIG_USER], [])
 181
 182 AC_DEFUN([SPL_AC_LICENSE], [
 183         AC_MSG_CHECKING([spl license])
 184         LICENSE=GPL
 185         AC_MSG_RESULT([$LICENSE])
 186         KERNELCPPFLAGS="${KERNELCPPFLAGS} -DHAVE_GPL_ONLY_SYMBOLS"
 187         AC_SUBST(LICENSE)
 188 ])
 189
 190 AC_DEFUN([SPL_AC_CONFIG], [
 191         SPL_CONFIG=all
 192         AC_ARG_WITH([config],
 193                 AS_HELP_STRING([--with-config=CONFIG],
 194                 [Config file 'kernel|user|all|srpm']),
 195                 [SPL_CONFIG="$withval"])
 196
 197         AC_MSG_CHECKING([spl config])
 198         AC_MSG_RESULT([$SPL_CONFIG]);
 199         AC_SUBST(SPL_CONFIG)
 200
 201         case "$SPL_CONFIG" in
 202                 kernel) SPL_AC_CONFIG_KERNEL ;;
 203                 user)   SPL_AC_CONFIG_USER   ;;
 204                 all)    SPL_AC_CONFIG_KERNEL
 205                         SPL_AC_CONFIG_USER   ;;
 206                 srpm)                        ;;
 207                 *)
 208                 AC_MSG_RESULT([Error!])
 209                 AC_MSG_ERROR([Bad value "$SPL_CONFIG" for --with-config,
 210                               user kernel|user|all|srpm]) ;;
 211         esac
 212
 213         AM_CONDITIONAL([CONFIG_USER],
 214                        [test "$SPL_CONFIG" = user] ||
 215                        [test "$SPL_CONFIG" = all])
 216         AM_CONDITIONAL([CONFIG_KERNEL],
 217                        [test "$SPL_CONFIG" = kernel] ||
 218                        [test "$SPL_CONFIG" = all])
 219 ])
 220
 221 dnl #
 222 dnl # Enable if the SPL should be compiled with internal debugging enabled.
 223 dnl # By default this support is disabled.
 224 dnl #
 225 AC_DEFUN([SPL_AC_DEBUG], [
 226         AC_ARG_ENABLE([debug],
 227                 [AS_HELP_STRING([--enable-debug],
 228                 [Enable generic debug support @<:@default=no@:>@])],
 229                 [],
 230                 [enable_debug=no])
 231
 232         AS_IF([test "x$enable_debug" = xyes],
 233                 [KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG"],
 234                 [KERNELCPPFLAGS="${KERNELCPPFLAGS} -DNDEBUG"])
 235
 236         AC_MSG_CHECKING([whether debugging is enabled])
 237         AC_MSG_RESULT([$enable_debug])
 238 ])
 239
 240 dnl #
 241 dnl # Enabled by default it provides a minimal level of memory tracking.
 242 dnl # A total count of bytes allocated is kept for each alloc and free.
 243 dnl # Then at module unload time a report to the console will be printed
 244 dnl # if memory was leaked.  Additionally, /proc/spl/kmem/slab will exist
 245 dnl # and provide an easy way to inspect the kmem based slab.
 246 dnl #
 247 AC_DEFUN([SPL_AC_DEBUG_KMEM], [
 248         AC_ARG_ENABLE([debug-kmem],
 249                 [AS_HELP_STRING([--enable-debug-kmem],
 250                 [Enable basic kmem accounting @<:@default=yes@:>@])],
 251                 [],
 252                 [enable_debug_kmem=yes])
 253
 254         AS_IF([test "x$enable_debug_kmem" = xyes],
 255                 [AC_DEFINE([DEBUG_KMEM], [1],
 256                 [Define to 1 to enable basic kmem accounting])
 257                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM"])
 258
 259         AC_MSG_CHECKING([whether basic kmem accounting is enabled])
 260         AC_MSG_RESULT([$enable_debug_kmem])
 261 ])
 262
 263 dnl #
 264 dnl # Disabled by default it provides detailed memory tracking.  This
 265 dnl # feature also requires --enable-debug-kmem to be set.  When enabled
 266 dnl # not only will total bytes be tracked but also the location of every
 267 dnl # alloc and free.  When the SPL module is unloaded a list of all leaked
 268 dnl # addresses and where they were allocated will be dumped to the console.
 269 dnl # Enabling this feature has a significant impact on performance but it
 270 dnl # makes finding memory leaks pretty straight forward.
 271 dnl #
 272 AC_DEFUN([SPL_AC_DEBUG_KMEM_TRACKING], [
 273         AC_ARG_ENABLE([debug-kmem-tracking],
 274                 [AS_HELP_STRING([--enable-debug-kmem-tracking],
 275                 [Enable detailed kmem tracking  @<:@default=no@:>@])],
 276                 [],
 277                 [enable_debug_kmem_tracking=no])
 278
 279         AS_IF([test "x$enable_debug_kmem_tracking" = xyes],
 280                 [AC_DEFINE([DEBUG_KMEM_TRACKING], [1],
 281                 [Define to 1 to enable detailed kmem tracking])
 282                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM_TRACKING"])
 283
 284         AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
 285         AC_MSG_RESULT([$enable_debug_kmem_tracking])
 286 ])
 287
 288 dnl #
 289 dnl # SPL_LINUX_CONFTEST
 290 dnl #
 291 AC_DEFUN([SPL_LINUX_CONFTEST], [
 292 cat >conftest.c <<_ACEOF
 293 $1
 294 _ACEOF
 295 ])
 296
 297 dnl #
 298 dnl # SPL_LANG_PROGRAM(C)([PROLOGUE], [BODY])
 299 dnl #
 300 m4_define([SPL_LANG_PROGRAM], [
 301 $1
 302 int
 303 main (void)
 304 {
 305 dnl Do *not* indent the following line: there may be CPP directives.
 306 dnl Don't move the `;' right after for the same reason.
 307 $2
 308   ;
 309   return 0;
 310 }
 311 ])
 312
 313 dnl #
 314 dnl # SPL_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
 315 dnl #
 316 AC_DEFUN([SPL_LINUX_COMPILE_IFELSE], [
 317         m4_ifvaln([$1], [SPL_LINUX_CONFTEST([$1])])
 318         rm -Rf build && mkdir -p build
 319         echo "obj-m := conftest.o" >build/Makefile
 320         AS_IF(
 321                 [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])],
 322                 [$4],
 323                 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
 324         )
 325         rm -Rf build
 326 ])
 327
 328 dnl #
 329 dnl # SPL_LINUX_TRY_COMPILE like AC_TRY_COMPILE
 330 dnl #
 331 AC_DEFUN([SPL_LINUX_TRY_COMPILE],
 332         [SPL_LINUX_COMPILE_IFELSE(
 333         [AC_LANG_SOURCE([SPL_LANG_PROGRAM([[$1]], [[$2]])])],
 334         [modules],
 335         [test -s build/conftest.o],
 336         [$3], [$4])
 337 ])
 338
 339 dnl #
 340 dnl # SPL_LINUX_CONFIG
 341 dnl #
 342 AC_DEFUN([SPL_LINUX_CONFIG],
 343         [AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
 344         SPL_LINUX_TRY_COMPILE([
 345                 #ifndef AUTOCONF_INCLUDED
 346                 #include <linux/config.h>
 347                 #endif
 348         ],[
 349                 #ifndef CONFIG_$1
 350                 #error CONFIG_$1 not #defined
 351                 #endif
 352         ],[
 353                 AC_MSG_RESULT([yes])
 354                 $2
 355         ],[
 356                 AC_MSG_RESULT([no])
 357                 $3
 358         ])
 359 ])
 360
 361 dnl #
 362 dnl # SPL_CHECK_SYMBOL_EXPORT
 363 dnl # check symbol exported or not
 364 dnl #
 365 AC_DEFUN([SPL_CHECK_SYMBOL_EXPORT],
 366         [AC_MSG_CHECKING([whether symbol $1 is exported])
 367         grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
 368                 $LINUX_OBJ/Module*.symvers 2>/dev/null
 369         rc=$?
 370         if test $rc -ne 0; then
 371                 export=0
 372                 for file in $2; do
 373                         grep -q -E "EXPORT_SYMBOL.*($1)" \
 374                                 "$LINUX_OBJ/$file" 2>/dev/null
 375                         rc=$?
 376                         if test $rc -eq 0; then
 377                                 export=1
 378                                 break;
 379                         fi
 380                 done
 381                 if test $export -eq 0; then
 382                         AC_MSG_RESULT([no])
 383                         $4
 384                 else
 385                         AC_MSG_RESULT([yes])
 386                         $3
 387                 fi
 388         else
 389                 AC_MSG_RESULT([yes])
 390                 $3
 391         fi
 392 ])
 393
 394 dnl #
 395 dnl # SPL_CHECK_HEADER
 396 dnl # check whether header exists and define HAVE_$2_HEADER
 397 dnl #
 398 AC_DEFUN([SPL_CHECK_HEADER],
 399         [AC_MSG_CHECKING([whether header $1 exists])
 400         SPL_LINUX_TRY_COMPILE([
 401                 #include <$1>
 402         ],[
 403                 return 0;
 404         ],[
 405                 AC_DEFINE(HAVE_$2_HEADER, 1, [$1 exists])
 406                 AC_MSG_RESULT(yes)
 407                 $3
 408         ],[
 409                 AC_MSG_RESULT(no)
 410                 $4
 411         ])
 412 ])
 413
 414 dnl #
 415 dnl # Use the atomic implemenation based on global spinlocks.  This
 416 dnl # should only be needed by 32-bit kernels which do not provide
 417 dnl # the atomic64_* API.  It may be optionally enabled as a fallback
 418 dnl # if problems are observed with the direct mapping to the native
 419 dnl # Linux atomic operations.  You may not disable atomic spinlocks
 420 dnl # if you kernel does not an atomic64_* API.
 421 dnl #
 422 AC_DEFUN([SPL_AC_ATOMIC_SPINLOCK], [
 423         AC_ARG_ENABLE([atomic-spinlocks],
 424                 [AS_HELP_STRING([--enable-atomic-spinlocks],
 425                 [Atomic types use spinlocks @<:@default=check@:>@])],
 426                 [],
 427                 [enable_atomic_spinlocks=check])
 428
 429         SPL_LINUX_TRY_COMPILE([
 430                 #include <asm/atomic.h>
 431         ],[
 432                 atomic64_t *ptr;
 433         ],[
 434                 have_atomic64_t=yes
 435                 AC_DEFINE(HAVE_ATOMIC64_T, 1,
 436                         [kernel defines atomic64_t])
 437         ],[
 438                 have_atomic64_t=no
 439         ])
 440
 441         AS_IF([test "x$enable_atomic_spinlocks" = xcheck], [
 442                 AS_IF([test "x$have_atomic64_t" = xyes], [
 443                         enable_atomic_spinlocks=no
 444                 ],[
 445                         enable_atomic_spinlocks=yes
 446                 ])
 447         ])
 448
 449         AS_IF([test "x$enable_atomic_spinlocks" = xyes], [
 450                 AC_DEFINE([ATOMIC_SPINLOCK], [1],
 451                         [Atomic types use spinlocks])
 452         ],[
 453                 AS_IF([test "x$have_atomic64_t" = xno], [
 454                         AC_MSG_FAILURE(
 455                         [--disable-atomic-spinlocks given but required atomic64 support is unavailable])
 456                 ])
 457         ])
 458
 459         AC_MSG_CHECKING([whether atomic types use spinlocks])
 460         AC_MSG_RESULT([$enable_atomic_spinlocks])
 461
 462         AC_MSG_CHECKING([whether kernel defines atomic64_t])
 463         AC_MSG_RESULT([$have_atomic64_t])
 464 ])
 465
 466 dnl #
 467 dnl # 2.6.24 API change,
 468 dnl # check if atomic64_cmpxchg is defined
 469 dnl #
 470 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_CMPXCHG],
 471         [AC_MSG_CHECKING([whether kernel defines atomic64_cmpxchg])
 472         SPL_LINUX_TRY_COMPILE([
 473                 #include <asm/atomic.h>
 474         ],[
 475                 atomic64_cmpxchg((atomic64_t *)NULL, 0, 0);
 476         ],[
 477                 AC_MSG_RESULT([yes])
 478                 AC_DEFINE(HAVE_ATOMIC64_CMPXCHG, 1,
 479                           [kernel defines atomic64_cmpxchg])
 480         ],[
 481                 AC_MSG_RESULT([no])
 482         ])
 483 ])
 484
 485 dnl #
 486 dnl # 2.6.24 API change,
 487 dnl # check if atomic64_xchg is defined
 488 dnl #
 489 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_XCHG],
 490         [AC_MSG_CHECKING([whether kernel defines atomic64_xchg])
 491         SPL_LINUX_TRY_COMPILE([
 492                 #include <asm/atomic.h>
 493         ],[
 494                 atomic64_xchg((atomic64_t *)NULL, 0);
 495         ],[
 496                 AC_MSG_RESULT([yes])
 497                 AC_DEFINE(HAVE_ATOMIC64_XCHG, 1,
 498                           [kernel defines atomic64_xchg])
 499         ],[
 500                 AC_MSG_RESULT([no])
 501         ])
 502 ])
 503
 504 dnl #
 505 dnl # 2.6.24 API change,
 506 dnl # check if uintptr_t typedef is defined
 507 dnl #
 508 AC_DEFUN([SPL_AC_TYPE_UINTPTR_T],
 509         [AC_MSG_CHECKING([whether kernel defines uintptr_t])
 510         SPL_LINUX_TRY_COMPILE([
 511                 #include <linux/types.h>
 512         ],[
 513                 uintptr_t *ptr;
 514         ],[
 515                 AC_MSG_RESULT([yes])
 516                 AC_DEFINE(HAVE_UINTPTR_T, 1,
 517                           [kernel defines uintptr_t])
 518         ],[
 519                 AC_MSG_RESULT([no])
 520         ])
 521 ])
 522
 523 dnl #
 524 dnl # 2.6.20 API change,
 525 dnl # INIT_WORK use 2 args and not store data inside
 526 dnl #
 527 AC_DEFUN([SPL_AC_3ARGS_INIT_WORK],
 528         [AC_MSG_CHECKING([whether INIT_WORK wants 3 args])
 529         SPL_LINUX_TRY_COMPILE([
 530                 #include <linux/workqueue.h>
 531         ],[
 532                 struct work_struct work;
 533                 INIT_WORK(&work, NULL, NULL);
 534         ],[
 535                 AC_MSG_RESULT(yes)
 536                 AC_DEFINE(HAVE_3ARGS_INIT_WORK, 1,
 537                           [INIT_WORK wants 3 args])
 538         ],[
 539                 AC_MSG_RESULT(no)
 540         ])
 541 ])
 542
 543 dnl #
 544 dnl # 2.6.21 API change,
 545 dnl # 'register_sysctl_table' use only one argument instead of two
 546 dnl #
 547 AC_DEFUN([SPL_AC_2ARGS_REGISTER_SYSCTL],
 548         [AC_MSG_CHECKING([whether register_sysctl_table() wants 2 args])
 549         SPL_LINUX_TRY_COMPILE([
 550                 #include <linux/sysctl.h>
 551         ],[
 552                 return register_sysctl_table(NULL,0);
 553         ],[
 554                 AC_MSG_RESULT(yes)
 555                 AC_DEFINE(HAVE_2ARGS_REGISTER_SYSCTL, 1,
 556                           [register_sysctl_table() wants 2 args])
 557         ],[
 558                 AC_MSG_RESULT(no)
 559         ])
 560 ])
 561
 562 dnl #
 563 dnl # 2.6.23 API change
 564 dnl # Old set_shrinker API replaced with register_shrinker
 565 dnl #
 566 AC_DEFUN([SPL_AC_SET_SHRINKER], [
 567         AC_MSG_CHECKING([whether set_shrinker() available])
 568         SPL_LINUX_TRY_COMPILE([
 569                 #include <linux/mm.h>
 570         ],[
 571                 return set_shrinker(DEFAULT_SEEKS, NULL);
 572         ],[
 573                 AC_MSG_RESULT([yes])
 574                 AC_DEFINE(HAVE_SET_SHRINKER, 1,
 575                           [set_shrinker() available])
 576         ],[
 577                 AC_MSG_RESULT([no])
 578         ])
 579 ])
 580
 581 dnl #
 582 dnl # 2.6.25 API change,
 583 dnl # struct path entry added to struct nameidata
 584 dnl #
 585 AC_DEFUN([SPL_AC_PATH_IN_NAMEIDATA],
 586         [AC_MSG_CHECKING([whether struct path used in struct nameidata])
 587         SPL_LINUX_TRY_COMPILE([
 588                 #include <linux/namei.h>
 589         ],[
 590                 struct nameidata nd;
 591
 592                 nd.path.mnt = NULL;
 593                 nd.path.dentry = NULL;
 594         ],[
 595                 AC_MSG_RESULT(yes)
 596                 AC_DEFINE(HAVE_PATH_IN_NAMEIDATA, 1,
 597                           [struct path used in struct nameidata])
 598         ],[
 599                 AC_MSG_RESULT(no)
 600         ])
 601 ])
 602
 603 dnl #
 604 dnl # Custom SPL patch may export this system it is not required
 605 dnl #
 606 AC_DEFUN([SPL_AC_TASK_CURR], [
 607         SPL_CHECK_SYMBOL_EXPORT([task_curr], [kernel/sched.c],
 608                 [AC_DEFINE(HAVE_TASK_CURR, 1, [task_curr() exported])],
 609                 [])
 610 ])
 611
 612 dnl #
 613 dnl # 2.6.19 API change,
 614 dnl # Use CTL_UNNUMBERED when binary sysctl is not required
 615 dnl #
 616 AC_DEFUN([SPL_AC_CTL_UNNUMBERED],
 617         [AC_MSG_CHECKING([whether unnumbered sysctl support exists])
 618         SPL_LINUX_TRY_COMPILE([
 619                 #include <linux/sysctl.h>
 620         ],[
 621                 #ifndef CTL_UNNUMBERED
 622                 #error CTL_UNNUMBERED undefined
 623                 #endif
 624         ],[
 625                 AC_MSG_RESULT(yes)
 626                 AC_DEFINE(HAVE_CTL_UNNUMBERED, 1,
 627                           [unnumbered sysctl support exists])
 628         ],[
 629                 AC_MSG_RESULT(no)
 630         ])
 631 ])
 632
 633 dnl #
 634 dnl # 2.6.16 API change.
 635 dnl # Check if 'fls64()' is available
 636 dnl #
 637 AC_DEFUN([SPL_AC_FLS64],
 638         [AC_MSG_CHECKING([whether fls64() is available])
 639         SPL_LINUX_TRY_COMPILE([
 640                 #include <linux/bitops.h>
 641         ],[
 642                 return fls64(0);
 643         ],[
 644                 AC_MSG_RESULT(yes)
 645                 AC_DEFINE(HAVE_FLS64, 1, [fls64() is available])
 646         ],[
 647                 AC_MSG_RESULT(no)
 648         ])
 649 ])
 650
 651 dnl #
 652 dnl # 2.6.18 API change, check whether device_create() is available.
 653 dnl # Device_create() was introduced in 2.6.18 and depricated
 654 dnl # class_device_create() which was fully removed in 2.6.26.
 655 dnl #
 656 AC_DEFUN([SPL_AC_DEVICE_CREATE], [
 657         SPL_CHECK_SYMBOL_EXPORT(
 658                 [device_create],
 659                 [drivers/base/core.c],
 660                 [AC_DEFINE(HAVE_DEVICE_CREATE, 1,
 661                 [device_create() is available])],
 662                 [])
 663 ])
 664
 665 dnl #
 666 dnl # 2.6.27 API change,
 667 dnl # device_create() uses 5 args, new 'drvdata' argument.
 668 dnl #
 669 AC_DEFUN([SPL_AC_5ARGS_DEVICE_CREATE], [
 670         AC_MSG_CHECKING([whether device_create() wants 5 args])
 671         tmp_flags="$EXTRA_KCFLAGS"
 672         EXTRA_KCFLAGS="-Werror"
 673         SPL_LINUX_TRY_COMPILE([
 674                 #include <linux/device.h>
 675         ],[
 676                 device_create(NULL, NULL, 0, NULL, "%d", 1);
 677         ],[
 678                 AC_MSG_RESULT(yes)
 679                 AC_DEFINE(HAVE_5ARGS_DEVICE_CREATE, 1,
 680                           [device_create wants 5 args])
 681         ],[
 682                 AC_MSG_RESULT(no)
 683         ])
 684         EXTRA_KCFLAGS="$tmp_flags"
 685 ])
 686
 687 dnl #
 688 dnl # 2.6.13 API change, check whether class_device_create() is available.
 689 dnl # Class_device_create() was introduced in 2.6.13 and depricated
 690 dnl # class_simple_device_add() which was fully removed in 2.6.13.
 691 dnl #
 692 AC_DEFUN([SPL_AC_CLASS_DEVICE_CREATE], [
 693         SPL_CHECK_SYMBOL_EXPORT(
 694                 [class_device_create],
 695                 [drivers/base/class.c],
 696                 [AC_DEFINE(HAVE_CLASS_DEVICE_CREATE, 1,
 697                 [class_device_create() is available])],
 698                 [])
 699 ])
 700
 701 dnl #
 702 dnl # 2.6.26 API change, set_normalized_timespec() is exported.
 703 dnl #
 704 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT], [
 705         SPL_CHECK_SYMBOL_EXPORT(
 706                 [set_normalized_timespec],
 707                 [kernel/time.c],
 708                 [AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_EXPORT, 1,
 709                 [set_normalized_timespec() is available as export])],
 710                 [])
 711 ])
 712
 713 dnl #
 714 dnl # 2.6.16 API change, set_normalize_timespec() moved to time.c
 715 dnl # previously it was available in time.h as an inline.
 716 dnl #
 717 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE], [
 718         AC_MSG_CHECKING([whether set_normalized_timespec() is an inline])
 719         SPL_LINUX_TRY_COMPILE([
 720                 #include <linux/time.h>
 721                 void set_normalized_timespec(struct timespec *ts,
 722                                              time_t sec, long nsec) { }
 723         ],
 724         [],
 725         [
 726                 AC_MSG_RESULT(no)
 727         ],[
 728                 AC_MSG_RESULT(yes)
 729                 AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_INLINE, 1,
 730                           [set_normalized_timespec() is available as inline])
 731         ])
 732 ])
 733
 734 dnl #
 735 dnl # 2.6.18 API change,
 736 dnl # timespec_sub() inline function available in linux/time.h
 737 dnl #
 738 AC_DEFUN([SPL_AC_TIMESPEC_SUB], [
 739         AC_MSG_CHECKING([whether timespec_sub() is available])
 740         SPL_LINUX_TRY_COMPILE([
 741                 #include <linux/time.h>
 742         ],[
 743                 struct timespec a, b, c = { 0 };
 744                 c = timespec_sub(a, b);
 745         ],[
 746                 AC_MSG_RESULT(yes)
 747                 AC_DEFINE(HAVE_TIMESPEC_SUB, 1, [timespec_sub() is available])
 748         ],[
 749                 AC_MSG_RESULT(no)
 750         ])
 751 ])
 752
 753 dnl #
 754 dnl # 2.6.19 API change,
 755 dnl # check if init_utsname() is available in linux/utsname.h
 756 dnl #
 757 AC_DEFUN([SPL_AC_INIT_UTSNAME], [
 758         AC_MSG_CHECKING([whether init_utsname() is available])
 759         SPL_LINUX_TRY_COMPILE([
 760                 #include <linux/utsname.h>
 761         ],[
 762                 struct new_utsname *a = init_utsname();
 763         ],[
 764                 AC_MSG_RESULT(yes)
 765                 AC_DEFINE(HAVE_INIT_UTSNAME, 1, [init_utsname() is available])
 766         ],[
 767                 AC_MSG_RESULT(no)
 768         ])
 769 ])
 770
 771 dnl #
 772 dnl # 2.6.26 API change,
 773 dnl # definition of struct fdtable relocated to linux/fdtable.h
 774 dnl #
 775 AC_DEFUN([SPL_AC_FDTABLE_HEADER], [
 776         SPL_CHECK_HEADER([linux/fdtable.h], [FDTABLE], [], [])
 777 ])
 778
 779 dnl #
 780 dnl # 2.6.14 API change,
 781 dnl # check whether 'files_fdtable()' exists
 782 dnl #
 783 AC_DEFUN([SPL_AC_FILES_FDTABLE], [
 784         AC_MSG_CHECKING([whether files_fdtable() is available])
 785         SPL_LINUX_TRY_COMPILE([
 786                 #include <linux/sched.h>
 787                 #include <linux/file.h>
 788                 #ifdef HAVE_FDTABLE_HEADER
 789                 #include <linux/fdtable.h>
 790                 #endif
 791         ],[
 792                 struct files_struct *files = current->files;
 793                 struct fdtable *fdt = files_fdtable(files);
 794         ],[
 795                 AC_MSG_RESULT(yes)
 796                 AC_DEFINE(HAVE_FILES_FDTABLE, 1, [files_fdtable() is available])
 797         ],[
 798                 AC_MSG_RESULT(no)
 799         ])
 800 ])
 801
 802 dnl #
 803 dnl # 2.6.18 API change,
 804 dnl # added linux/uaccess.h
 805 dnl #
 806 AC_DEFUN([SPL_AC_UACCESS_HEADER], [
 807         SPL_CHECK_HEADER([linux/uaccess.h], [UACCESS], [], [])
 808 ])
 809
 810 dnl #
 811 dnl # 2.6.12 API change,
 812 dnl # check whether 'kmalloc_node()' is available.
 813 dnl #
 814 AC_DEFUN([SPL_AC_KMALLOC_NODE], [
 815         AC_MSG_CHECKING([whether kmalloc_node() is available])
 816         SPL_LINUX_TRY_COMPILE([
 817                 #include <linux/slab.h>
 818         ],[
 819                 void *a = kmalloc_node(1, GFP_KERNEL, 0);
 820         ],[
 821                 AC_MSG_RESULT(yes)
 822                 AC_DEFINE(HAVE_KMALLOC_NODE, 1, [kmalloc_node() is available])
 823         ],[
 824                 AC_MSG_RESULT(no)
 825         ])
 826 ])
 827
 828 dnl #
 829 dnl # 2.6.9 API change,
 830 dnl # check whether 'monotonic_clock()' is available it may
 831 dnl # be available for some archs but not others.
 832 dnl #
 833 AC_DEFUN([SPL_AC_MONOTONIC_CLOCK], [
 834         SPL_CHECK_SYMBOL_EXPORT(
 835                 [monotonic_clock],
 836                 [],
 837                 [AC_DEFINE(HAVE_MONOTONIC_CLOCK, 1,
 838                 [monotonic_clock() is available])],
 839                 [])
 840 ])
 841
 842 dnl #
 843 dnl # 2.6.16 API change,
 844 dnl # check whether 'struct inode' has i_mutex
 845 dnl #
 846 AC_DEFUN([SPL_AC_INODE_I_MUTEX], [
 847         AC_MSG_CHECKING([whether struct inode has i_mutex])
 848         SPL_LINUX_TRY_COMPILE([
 849                 #include <linux/fs.h>
 850                 #include <linux/mutex.h>
 851         ],[
 852                 struct inode i;
 853                 mutex_init(&i.i_mutex);
 854         ],[
 855                 AC_MSG_RESULT(yes)
 856                 AC_DEFINE(HAVE_INODE_I_MUTEX, 1, [struct inode has i_mutex])
 857         ],[
 858                 AC_MSG_RESULT(no)
 859         ])
 860 ])
 861
 862 dnl #
 863 dnl # 2.6.29 API change,
 864 dnl # Adaptive mutexs introduced.
 865 dnl #
 866 AC_DEFUN([SPL_AC_MUTEX_OWNER], [
 867         AC_MSG_CHECKING([whether struct mutex has owner])
 868         SPL_LINUX_TRY_COMPILE([
 869                 #include <linux/mutex.h>
 870         ],[
 871                 struct mutex mtx;
 872                 mtx.owner = NULL;
 873         ],[
 874                 AC_MSG_RESULT(yes)
 875                 AC_DEFINE(HAVE_MUTEX_OWNER, 1, [struct mutex has owner])
 876         ],[
 877                 AC_MSG_RESULT(no)
 878         ])
 879 ])
 880
 881 dnl #
 882 dnl # 2.6.18 API change,
 883 dnl # First introduced 'mutex_lock_nested()' in include/linux/mutex.h,
 884 dnl # as part of the mutex validator.  Fallback to using 'mutex_lock()'
 885 dnl # if the mutex validator is disabled or otherwise unavailable.
 886 dnl #
 887 AC_DEFUN([SPL_AC_MUTEX_LOCK_NESTED], [
 888         AC_MSG_CHECKING([whether mutex_lock_nested() is available])
 889         SPL_LINUX_TRY_COMPILE([
 890                 #include <linux/mutex.h>
 891         ],[
 892                 struct mutex mutex;
 893                 mutex_init(&mutex);
 894                 mutex_lock_nested(&mutex, 0);
 895         ],[
 896                 AC_MSG_RESULT(yes)
 897                 AC_DEFINE(HAVE_MUTEX_LOCK_NESTED, 1,
 898                 [mutex_lock_nested() is available])
 899         ],[
 900                 AC_MSG_RESULT(no)
 901         ])
 902 ])
 903
 904 dnl #
 905 dnl # 2.6.22 API change,
 906 dnl # First introduced 'div64_64()' in lib/div64.c
 907 dnl
 908 AC_DEFUN([SPL_AC_DIV64_64], [
 909         SPL_CHECK_SYMBOL_EXPORT(
 910                 [div64_64],
 911                 [],
 912                 [AC_DEFINE(HAVE_DIV64_64, 1,
 913                 [div64_64() is available])],
 914                 [])
 915 ])
 916
 917 dnl #
 918 dnl # 2.6.26 API change,
 919 dnl # Renamed 'div64_64()' to 'div64_u64' in lib/div64.c
 920 dnl #
 921 AC_DEFUN([SPL_AC_DIV64_U64], [
 922         SPL_CHECK_SYMBOL_EXPORT(
 923                 [div64_u64],
 924                 [],
 925                 [AC_DEFINE(HAVE_DIV64_U64, 1,
 926                 [div64_u64() is available])],
 927                 [])
 928 ])
 929
 930 dnl #
 931 dnl # 2.6.27 API change,
 932 dnl # on_each_cpu() uses 3 args, no 'retry' argument
 933 dnl #
 934 AC_DEFUN([SPL_AC_3ARGS_ON_EACH_CPU], [
 935         AC_MSG_CHECKING([whether on_each_cpu() wants 3 args])
 936         SPL_LINUX_TRY_COMPILE([
 937                 #include <linux/smp.h>
 938         ],[
 939                 on_each_cpu(NULL, NULL, 0);
 940         ],[
 941                 AC_MSG_RESULT(yes)
 942                 AC_DEFINE(HAVE_3ARGS_ON_EACH_CPU, 1,
 943                           [on_each_cpu wants 3 args])
 944         ],[
 945                 AC_MSG_RESULT(no)
 946         ])
 947 ])
 948
 949 dnl #
 950 dnl # 2.6.18 API change,
 951 dnl # kallsyms_lookup_name no longer exported
 952 dnl #
 953 AC_DEFUN([SPL_AC_KALLSYMS_LOOKUP_NAME], [
 954         SPL_CHECK_SYMBOL_EXPORT(
 955                 [kallsyms_lookup_name],
 956                 [],
 957                 [AC_DEFINE(HAVE_KALLSYMS_LOOKUP_NAME, 1,
 958                 [kallsyms_lookup_name() is available])],
 959                 [])
 960 ])
 961
 962 dnl #
 963 dnl # Proposed API change,
 964 dnl # This symbol is not available in stock kernels.  You may build a
 965 dnl # custom kernel with the *-spl-export-symbols.patch which will export
 966 dnl # these symbols for use.  If your already rolling a custom kernel for
 967 dnl # your environment this is recommended.
 968 dnl #
 969 AC_DEFUN([SPL_AC_GET_VMALLOC_INFO], [
 970         SPL_CHECK_SYMBOL_EXPORT(
 971                 [get_vmalloc_info],
 972                 [],
 973                 [AC_DEFINE(HAVE_GET_VMALLOC_INFO, 1,
 974                 [get_vmalloc_info() is available])],
 975                 [])
 976 ])
 977
 978 dnl #
 979 dnl # 2.6.17 API change
 980 dnl # The helper functions first_online_pgdat(), next_online_pgdat(), and
 981 dnl # next_zone() are introduced to simplify for_each_zone().  These symbols
 982 dnl # were exported in 2.6.17 for use by modules which was consistent with
 983 dnl # the previous implementation of for_each_zone().  From 2.6.18 - 2.6.19
 984 dnl # the symbols were exported as 'unused', and by 2.6.20 they exports
 985 dnl # were dropped entirely leaving modules no way to directly iterate over
 986 dnl # the zone list.  Because we need access to the zone helpers we check
 987 dnl # if the kernel contains the old or new implementation.  Then we check
 988 dnl # to see if the symbols we need for each version are available.  If they
 989 dnl # are not, dynamically aquire the addresses with kallsyms_lookup_name().
 990 dnl #
 991 AC_DEFUN([SPL_AC_PGDAT_HELPERS], [
 992         AC_MSG_CHECKING([whether symbol *_pgdat exist])
 993         grep -q -E 'first_online_pgdat' $LINUX/include/linux/mmzone.h 2>/dev/null
 994         rc=$?
 995         if test $rc -eq 0; then
 996                 AC_MSG_RESULT([yes])
 997                 AC_DEFINE(HAVE_PGDAT_HELPERS, 1, [pgdat helpers are available])
 998         else
 999                 AC_MSG_RESULT([no])
1000         fi
1001 ])
1002
1003 dnl #
1004 dnl # Proposed API change,
1005 dnl # This symbol is not available in stock kernels.  You may build a
1006 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1007 dnl # these symbols for use.  If your already rolling a custom kernel for
1008 dnl # your environment this is recommended.
1009 dnl #
1010 AC_DEFUN([SPL_AC_FIRST_ONLINE_PGDAT], [
1011         SPL_CHECK_SYMBOL_EXPORT(
1012                 [first_online_pgdat],
1013                 [],
1014                 [AC_DEFINE(HAVE_FIRST_ONLINE_PGDAT, 1,
1015                 [first_online_pgdat() is available])],
1016                 [])
1017 ])
1018
1019 dnl #
1020 dnl # Proposed API change,
1021 dnl # This symbol is not available in stock kernels.  You may build a
1022 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1023 dnl # these symbols for use.  If your already rolling a custom kernel for
1024 dnl # your environment this is recommended.
1025 dnl #
1026 AC_DEFUN([SPL_AC_NEXT_ONLINE_PGDAT], [
1027         SPL_CHECK_SYMBOL_EXPORT(
1028                 [next_online_pgdat],
1029                 [],
1030                 [AC_DEFINE(HAVE_NEXT_ONLINE_PGDAT, 1,
1031                 [next_online_pgdat() is available])],
1032                 [])
1033 ])
1034
1035 dnl #
1036 dnl # Proposed API change,
1037 dnl # This symbol is not available in stock kernels.  You may build a
1038 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1039 dnl # these symbols for use.  If your already rolling a custom kernel for
1040 dnl # your environment this is recommended.
1041 dnl #
1042 AC_DEFUN([SPL_AC_NEXT_ZONE], [
1043         SPL_CHECK_SYMBOL_EXPORT(
1044                 [next_zone],
1045                 [],
1046                 [AC_DEFINE(HAVE_NEXT_ZONE, 1,
1047                 [next_zone() is available])],
1048                 [])
1049 ])
1050
1051 dnl #
1052 dnl # 2.6.17 API change,
1053 dnl # See SPL_AC_PGDAT_HELPERS for details.
1054 dnl #
1055 AC_DEFUN([SPL_AC_PGDAT_LIST], [
1056         SPL_CHECK_SYMBOL_EXPORT(
1057                 [pgdat_list],
1058                 [],
1059                 [AC_DEFINE(HAVE_PGDAT_LIST, 1,
1060                 [pgdat_list is available])],
1061                 [])
1062 ])
1063
1064 dnl #
1065 dnl # 2.6.18 API change,
1066 dnl # First introduced global_page_state() support as an inline.
1067 dnl #
1068 AC_DEFUN([SPL_AC_GLOBAL_PAGE_STATE], [
1069         AC_MSG_CHECKING([whether global_page_state() is available])
1070         SPL_LINUX_TRY_COMPILE([
1071                 #include <linux/mm.h>
1072         ],[
1073                 unsigned long state;
1074                 state = global_page_state(0);
1075         ],[
1076                 AC_MSG_RESULT(yes)
1077                 AC_DEFINE(HAVE_GLOBAL_PAGE_STATE, 1,
1078                           [global_page_state() is available])
1079         ],[
1080                 AC_MSG_RESULT(no)
1081         ])
1082 ])
1083
1084 dnl #
1085 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1086 dnl # Public global zone stats now include a free page count.  However
1087 dnl # the enumerated names of the counters have changed since this API
1088 dnl # was introduced.  We need to deduce the corrent name to use.  This
1089 dnl # replaces the priviate get_zone_counts() interface.
1090 dnl #
1091 dnl # NR_FREE_PAGES was available from 2.6.21 to current kernels, which
1092 dnl # is 2.6.30 as of when this was written.
1093 dnl #
1094 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_FREE], [
1095         AC_MSG_CHECKING([whether page state NR_FREE_PAGES is available])
1096         SPL_LINUX_TRY_COMPILE([
1097                 #include <linux/mm.h>
1098         ],[
1099                 enum zone_stat_item zsi;
1100                 zsi = NR_FREE_PAGES;
1101         ],[
1102                 AC_MSG_RESULT(yes)
1103                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES, 1,
1104                           [Page state NR_FREE_PAGES is available])
1105         ],[
1106                 AC_MSG_RESULT(no)
1107         ])
1108 ])
1109
1110 dnl #
1111 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1112 dnl # Public global zone stats now include an inactive page count.  However
1113 dnl # the enumerated names of the counters have changed since this API
1114 dnl # was introduced.  We need to deduce the corrent name to use.  This
1115 dnl # replaces the priviate get_zone_counts() interface.
1116 dnl #
1117 dnl # NR_INACTIVE was available from 2.6.21 to 2.6.27 and included both
1118 dnl # anonymous and file inactive pages.  As of 2.6.28 it was split in
1119 dnl # to NR_INACTIVE_ANON and NR_INACTIVE_FILE.
1120 dnl #
1121 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_INACTIVE], [
1122         AC_MSG_CHECKING([whether page state NR_INACTIVE is available])
1123         SPL_LINUX_TRY_COMPILE([
1124                 #include <linux/mm.h>
1125         ],[
1126                 enum zone_stat_item zsi;
1127                 zsi = NR_INACTIVE;
1128         ],[
1129                 AC_MSG_RESULT(yes)
1130                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE, 1,
1131                           [Page state NR_INACTIVE is available])
1132         ],[
1133                 AC_MSG_RESULT(no)
1134         ])
1135
1136         AC_MSG_CHECKING([whether page state NR_INACTIVE_ANON is available])
1137         SPL_LINUX_TRY_COMPILE([
1138                 #include <linux/mm.h>
1139         ],[
1140                 enum zone_stat_item zsi;
1141                 zsi = NR_INACTIVE_ANON;
1142         ],[
1143                 AC_MSG_RESULT(yes)
1144                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON, 1,
1145                           [Page state NR_INACTIVE_ANON is available])
1146         ],[
1147                 AC_MSG_RESULT(no)
1148         ])
1149
1150         AC_MSG_CHECKING([whether page state NR_INACTIVE_FILE is available])
1151         SPL_LINUX_TRY_COMPILE([
1152                 #include <linux/mm.h>
1153         ],[
1154                 enum zone_stat_item zsi;
1155                 zsi = NR_INACTIVE_FILE;
1156         ],[
1157                 AC_MSG_RESULT(yes)
1158                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE, 1,
1159                           [Page state NR_INACTIVE_FILE is available])
1160         ],[
1161                 AC_MSG_RESULT(no)
1162         ])
1163 ])
1164
1165 dnl #
1166 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1167 dnl # Public global zone stats now include an active page count.  However
1168 dnl # the enumerated names of the counters have changed since this API
1169 dnl # was introduced.  We need to deduce the corrent name to use.  This
1170 dnl # replaces the priviate get_zone_counts() interface.
1171 dnl #
1172 dnl # NR_ACTIVE was available from 2.6.21 to 2.6.27 and included both
1173 dnl # anonymous and file active pages.  As of 2.6.28 it was split in
1174 dnl # to NR_ACTIVE_ANON and NR_ACTIVE_FILE.
1175 dnl #
1176 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_ACTIVE], [
1177         AC_MSG_CHECKING([whether page state NR_ACTIVE is available])
1178         SPL_LINUX_TRY_COMPILE([
1179                 #include <linux/mm.h>
1180         ],[
1181                 enum zone_stat_item zsi;
1182                 zsi = NR_ACTIVE;
1183         ],[
1184                 AC_MSG_RESULT(yes)
1185                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE, 1,
1186                           [Page state NR_ACTIVE is available])
1187         ],[
1188                 AC_MSG_RESULT(no)
1189         ])
1190
1191         AC_MSG_CHECKING([whether page state NR_ACTIVE_ANON is available])
1192         SPL_LINUX_TRY_COMPILE([
1193                 #include <linux/mm.h>
1194         ],[
1195                 enum zone_stat_item zsi;
1196                 zsi = NR_ACTIVE_ANON;
1197         ],[
1198                 AC_MSG_RESULT(yes)
1199                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON, 1,
1200                           [Page state NR_ACTIVE_ANON is available])
1201         ],[
1202                 AC_MSG_RESULT(no)
1203         ])
1204
1205         AC_MSG_CHECKING([whether page state NR_ACTIVE_FILE is available])
1206         SPL_LINUX_TRY_COMPILE([
1207                 #include <linux/mm.h>
1208         ],[
1209                 enum zone_stat_item zsi;
1210                 zsi = NR_ACTIVE_FILE;
1211         ],[
1212                 AC_MSG_RESULT(yes)
1213                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE, 1,
1214                           [Page state NR_ACTIVE_FILE is available])
1215         ],[
1216                 AC_MSG_RESULT(no)
1217         ])
1218 ])
1219
1220 dnl #
1221 dnl # Proposed API change for legacy kernels.
1222 dnl # This symbol is not available in older kernels.  For kernels post
1223 dnl # 2.6.21 the global_page_state() API is used to get free/inactive/active
1224 dnl # page state information.  This symbol is only used in legacy kernels
1225 dnl # any only as a last resort.
1226 dnl
1227 AC_DEFUN([SPL_AC_GET_ZONE_COUNTS], [
1228         AC_MSG_CHECKING([whether symbol get_zone_counts is needed])
1229         SPL_LINUX_TRY_COMPILE([
1230         ],[
1231                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES)
1232                 #error "global_page_state needs NR_FREE_PAGES"
1233                 #endif
1234
1235                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE) && \
1236                     !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON) && \
1237                     !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE)
1238                 #error "global_page_state needs NR_ACTIVE*"
1239                 #endif
1240
1241                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE) && \
1242                     !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON) && \
1243                     !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE)
1244                 #error "global_page_state needs NR_INACTIVE*"
1245                 #endif
1246         ],[
1247                 AC_MSG_RESULT(no)
1248         ],[
1249                 AC_MSG_RESULT(yes)
1250                 AC_DEFINE(NEED_GET_ZONE_COUNTS, 1,
1251                           [get_zone_counts() is needed])
1252
1253                 SPL_CHECK_SYMBOL_EXPORT(
1254                         [get_zone_counts],
1255                         [],
1256                         [AC_DEFINE(HAVE_GET_ZONE_COUNTS, 1,
1257                         [get_zone_counts() is available])],
1258                         [])
1259         ])
1260 ])
1261
1262 dnl #
1263 dnl # Symbol available in RHEL kernels not in stock kernels.
1264 dnl #
1265 AC_DEFUN([SPL_AC_SET_FS_PWD], [
1266         SPL_CHECK_SYMBOL_EXPORT(
1267                 [set_fs_pwd],
1268                 [],
1269                 [AC_DEFINE(HAVE_SET_FS_PWD, 1,
1270                 [set_fs_pwd() is available])],
1271                 [])
1272 ])
1273
1274 dnl #
1275 dnl # 2.6.25 API change,
1276 dnl # Simplied API by replacing mnt+dentry args with a single path arg.
1277 dnl #
1278 AC_DEFUN([SPL_AC_2ARGS_SET_FS_PWD],
1279         [AC_MSG_CHECKING([whether set_fs_pwd() wants 2 args])
1280         SPL_LINUX_TRY_COMPILE([
1281                 #include <linux/sched.h>
1282                 #include <linux/fs_struct.h>
1283         ],[
1284                 set_fs_pwd(NULL, NULL);
1285         ],[
1286                 AC_MSG_RESULT(yes)
1287                 AC_DEFINE(HAVE_2ARGS_SET_FS_PWD, 1,
1288                           [set_fs_pwd() wants 2 args])
1289         ],[
1290                 AC_MSG_RESULT(no)
1291         ])
1292 ])
1293
1294 dnl #
1295 dnl # SLES API change, never adopted in mainline,
1296 dnl # Third 'struct vfsmount *' argument removed.
1297 dnl #
1298 AC_DEFUN([SPL_AC_2ARGS_VFS_UNLINK],
1299         [AC_MSG_CHECKING([whether vfs_unlink() wants 2 args])
1300         SPL_LINUX_TRY_COMPILE([
1301                 #include <linux/fs.h>
1302         ],[
1303                 vfs_unlink(NULL, NULL);
1304         ],[
1305                 AC_MSG_RESULT(yes)
1306                 AC_DEFINE(HAVE_2ARGS_VFS_UNLINK, 1,
1307                           [vfs_unlink() wants 2 args])
1308         ],[
1309                 AC_MSG_RESULT(no)
1310         ])
1311 ])
1312
1313 dnl #
1314 dnl # SLES API change, never adopted in mainline,
1315 dnl # Third and sixth 'struct vfsmount *' argument removed.
1316 dnl #
1317 AC_DEFUN([SPL_AC_4ARGS_VFS_RENAME],
1318         [AC_MSG_CHECKING([whether vfs_rename() wants 4 args])
1319         SPL_LINUX_TRY_COMPILE([
1320                 #include <linux/fs.h>
1321         ],[
1322                 vfs_rename(NULL, NULL, NULL, NULL);
1323         ],[
1324                 AC_MSG_RESULT(yes)
1325                 AC_DEFINE(HAVE_4ARGS_VFS_RENAME, 1,
1326                           [vfs_rename() wants 4 args])
1327         ],[
1328                 AC_MSG_RESULT(no)
1329         ])
1330 ])
1331
1332 dnl #
1333 dnl # 2.6.29 API change,
1334 dnl # check whether 'struct cred' exists
1335 dnl #
1336 AC_DEFUN([SPL_AC_CRED_STRUCT], [
1337         AC_MSG_CHECKING([whether struct cred exists])
1338         SPL_LINUX_TRY_COMPILE([
1339                 #include <linux/cred.h>
1340         ],[
1341                 struct cred *cr;
1342                 cr  = NULL;
1343         ],[
1344                 AC_MSG_RESULT(yes)
1345                 AC_DEFINE(HAVE_CRED_STRUCT, 1, [struct cred exists])
1346         ],[
1347                 AC_MSG_RESULT(no)
1348         ])
1349 ])
1350
1351 dnl #
1352 dnl # Custom SPL patch may export this symbol.
1353 dnl #
1354 AC_DEFUN([SPL_AC_GROUPS_SEARCH], [
1355         SPL_CHECK_SYMBOL_EXPORT(
1356                 [groups_search],
1357                 [],
1358                 [AC_DEFINE(HAVE_GROUPS_SEARCH, 1,
1359                 [groups_search() is available])],
1360                 [])
1361 ])
1362
1363 dnl #
1364 dnl # 2.6.x API change,
1365 dnl # __put_task_struct() was exported in RHEL5 but unavailable elsewhere.
1366 dnl #
1367 AC_DEFUN([SPL_AC_PUT_TASK_STRUCT], [
1368         SPL_CHECK_SYMBOL_EXPORT(
1369                 [__put_task_struct],
1370                 [],
1371                 [AC_DEFINE(HAVE_PUT_TASK_STRUCT, 1,
1372                 [__put_task_struct() is available])],
1373                 [])
1374 ])
1375
1376 dnl #
1377 dnl # 2.6.32 API change,
1378 dnl # Unused 'struct file *' removed from prototype.
1379 dnl #
1380 AC_DEFUN([SPL_AC_5ARGS_PROC_HANDLER], [
1381         AC_MSG_CHECKING([whether proc_handler() wants 5 args])
1382         SPL_LINUX_TRY_COMPILE([
1383                 #include <linux/sysctl.h>
1384         ],[
1385                 proc_dostring(NULL, 0, NULL, NULL, NULL);
1386         ],[
1387                 AC_MSG_RESULT(yes)
1388                 AC_DEFINE(HAVE_5ARGS_PROC_HANDLER, 1,
1389                           [proc_handler() wants 5 args])
1390         ],[
1391                 AC_MSG_RESULT(no)
1392         ])
1393 ])