config/spl-build.m4

   1 ###############################################################################
   2 # Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
   3 # Copyright (C) 2007 The Regents of the University of California.
   4 # Written by Brian Behlendorf <behlendorf1@llnl.gov>.
   5 ###############################################################################
   6 # SPL_AC_CONFIG_KERNEL: Default SPL kernel configuration.
   7 ###############################################################################
   8
   9 AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
  10         SPL_AC_KERNEL
  11
  12         if test "${LINUX_OBJ}" != "${LINUX}"; then
  13                 KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
  14         fi
  15         AC_SUBST(KERNELMAKE_PARAMS)
  16
  17         KERNELCPPFLAGS="$KERNELCPPFLAGS -Wstrict-prototypes"
  18         AC_SUBST(KERNELCPPFLAGS)
  19
  20         SPL_AC_DEBUG
  21         SPL_AC_DEBUG_LOG
  22         SPL_AC_DEBUG_KMEM
  23         SPL_AC_DEBUG_KMEM_TRACKING
  24         SPL_AC_TEST_MODULE
  25         SPL_AC_ATOMIC_SPINLOCK
  26         SPL_AC_TYPE_ATOMIC64_CMPXCHG
  27         SPL_AC_TYPE_ATOMIC64_XCHG
  28         SPL_AC_TYPE_UINTPTR_T
  29         SPL_AC_2ARGS_REGISTER_SYSCTL
  30         SPL_AC_SET_SHRINKER
  31         SPL_AC_3ARGS_SHRINKER_CALLBACK
  32         SPL_AC_PATH_IN_NAMEIDATA
  33         SPL_AC_TASK_CURR
  34         SPL_AC_CTL_UNNUMBERED
  35         SPL_AC_CTL_NAME
  36         SPL_AC_FLS64
  37         SPL_AC_DEVICE_CREATE
  38         SPL_AC_5ARGS_DEVICE_CREATE
  39         SPL_AC_CLASS_DEVICE_CREATE
  40         SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT
  41         SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE
  42         SPL_AC_TIMESPEC_SUB
  43         SPL_AC_INIT_UTSNAME
  44         SPL_AC_UACCESS_HEADER
  45         SPL_AC_KMALLOC_NODE
  46         SPL_AC_MONOTONIC_CLOCK
  47         SPL_AC_INODE_I_MUTEX
  48         SPL_AC_MUTEX_OWNER
  49         SPL_AC_MUTEX_OWNER_TASK_STRUCT
  50         SPL_AC_MUTEX_LOCK_NESTED
  51         SPL_AC_3ARGS_ON_EACH_CPU
  52         SPL_AC_KALLSYMS_LOOKUP_NAME
  53         SPL_AC_GET_VMALLOC_INFO
  54         SPL_AC_PGDAT_HELPERS
  55         SPL_AC_FIRST_ONLINE_PGDAT
  56         SPL_AC_NEXT_ONLINE_PGDAT
  57         SPL_AC_NEXT_ZONE
  58         SPL_AC_PGDAT_LIST
  59         SPL_AC_GLOBAL_PAGE_STATE
  60         SPL_AC_ZONE_STAT_ITEM_FREE
  61         SPL_AC_ZONE_STAT_ITEM_INACTIVE
  62         SPL_AC_ZONE_STAT_ITEM_ACTIVE
  63         SPL_AC_GET_ZONE_COUNTS
  64         SPL_AC_USER_PATH_DIR
  65         SPL_AC_SET_FS_PWD
  66         SPL_AC_2ARGS_SET_FS_PWD
  67         SPL_AC_SET_FS_PWD_WITH_CONST
  68         SPL_AC_2ARGS_VFS_UNLINK
  69         SPL_AC_4ARGS_VFS_RENAME
  70         SPL_AC_VFS_FSYNC
  71         SPL_AC_2ARGS_VFS_FSYNC
  72         SPL_AC_INODE_TRUNCATE_RANGE
  73         SPL_AC_FS_STRUCT_SPINLOCK
  74         SPL_AC_CRED_STRUCT
  75         SPL_AC_GROUPS_SEARCH
  76         SPL_AC_PUT_TASK_STRUCT
  77         SPL_AC_5ARGS_PROC_HANDLER
  78         SPL_AC_KVASPRINTF
  79         SPL_AC_EXPORTED_RWSEM_IS_LOCKED
  80         SPL_AC_KERNEL_FALLOCATE
  81         SPL_AC_SHRINK_DCACHE_MEMORY
  82         SPL_AC_SHRINK_ICACHE_MEMORY
  83         SPL_AC_KERN_PATH_PARENT_HEADER
  84         SPL_AC_KERN_PATH_PARENT_SYMBOL
  85         SPL_AC_KERN_PATH_LOCKED
  86         SPL_AC_CONFIG_KALLSYMS
  87         SPL_AC_CONFIG_ZLIB_INFLATE
  88         SPL_AC_CONFIG_ZLIB_DEFLATE
  89         SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
  90         SPL_AC_SHRINK_CONTROL_STRUCT
  91         SPL_AC_RWSEM_SPINLOCK_IS_RAW
  92         SPL_AC_SCHED_RT_HEADER
  93         SPL_AC_2ARGS_VFS_GETATTR
  94 ])
  95
  96 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
  97         modpost=$LINUX/scripts/Makefile.modpost
  98         AC_MSG_CHECKING([kernel file name for module symbols])
  99         if test "x$enable_linux_builtin" != xyes -a -f "$modpost"; then
 100                 if grep -q Modules.symvers $modpost; then
 101                         LINUX_SYMBOLS=Modules.symvers
 102                 else
 103                         LINUX_SYMBOLS=Module.symvers
 104                 fi
 105
 106                 if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
 107                         AC_MSG_ERROR([
 108         *** Please make sure the kernel devel package for your distribution
 109         *** is installed.  If your building with a custom kernel make sure the
 110         *** kernel is configured, built, and the '--with-linux=PATH' configure
 111         *** option refers to the location of the kernel source.])
 112                 fi
 113         else
 114                 LINUX_SYMBOLS=NONE
 115         fi
 116         AC_MSG_RESULT($LINUX_SYMBOLS)
 117         AC_SUBST(LINUX_SYMBOLS)
 118 ])
 119
 120 AC_DEFUN([SPL_AC_KERNEL], [
 121         AC_ARG_WITH([linux],
 122                 AS_HELP_STRING([--with-linux=PATH],
 123                 [Path to kernel source]),
 124                 [kernelsrc="$withval"])
 125
 126         AC_ARG_WITH([linux-obj],
 127                 AS_HELP_STRING([--with-linux-obj=PATH],
 128                 [Path to kernel build objects]),
 129                 [kernelbuild="$withval"])
 130
 131         AC_MSG_CHECKING([kernel source directory])
 132         if test -z "$kernelsrc"; then
 133                 if test -e "/lib/modules/$(uname -r)/source"; then
 134                         headersdir="/lib/modules/$(uname -r)/source"
 135                         sourcelink=$(readlink -f "$headersdir")
 136                 elif test -e "/lib/modules/$(uname -r)/build"; then
 137                         headersdir="/lib/modules/$(uname -r)/build"
 138                         sourcelink=$(readlink -f "$headersdir")
 139                 else
 140                         sourcelink=$(ls -1d /usr/src/kernels/* \
 141                                      /usr/src/linux-* \
 142                                      2>/dev/null | grep -v obj | tail -1)
 143                 fi
 144
 145                 if test -n "$sourcelink" && test -e ${sourcelink}; then
 146                         kernelsrc=`readlink -f ${sourcelink}`
 147                 else
 148                         kernelsrc="[Not found]"
 149                 fi
 150         else
 151                 if test "$kernelsrc" = "NONE"; then
 152                         kernsrcver=NONE
 153                 fi
 154         fi
 155
 156         AC_MSG_RESULT([$kernelsrc])
 157         if test ! -d "$kernelsrc"; then
 158                 AC_MSG_ERROR([
 159         *** Please make sure the kernel devel package for your distribution
 160         *** is installed then try again.  If that fails you can specify the
 161         *** location of the kernel source with the '--with-linux=PATH' option.])
 162         fi
 163
 164         AC_MSG_CHECKING([kernel build directory])
 165         if test -z "$kernelbuild"; then
 166                 if test -e "/lib/modules/$(uname -r)/build"; then
 167                         kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
 168                 elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
 169                         kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
 170                 elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
 171                         kernelbuild=${kernelsrc}-obj/${target_cpu}/default
 172                 elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
 173                         kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
 174                 else
 175                         kernelbuild=${kernelsrc}
 176                 fi
 177         fi
 178         AC_MSG_RESULT([$kernelbuild])
 179
 180         AC_MSG_CHECKING([kernel source version])
 181         utsrelease1=$kernelbuild/include/linux/version.h
 182         utsrelease2=$kernelbuild/include/linux/utsrelease.h
 183         utsrelease3=$kernelbuild/include/generated/utsrelease.h
 184         if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
 185                 utsrelease=linux/version.h
 186         elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
 187                 utsrelease=linux/utsrelease.h
 188         elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
 189                 utsrelease=generated/utsrelease.h
 190         fi
 191
 192         if test "$utsrelease"; then
 193                 kernsrcver=`(echo "#include <$utsrelease>";
 194                              echo "kernsrcver=UTS_RELEASE") |
 195                              cpp -I $kernelbuild/include |
 196                              grep "^kernsrcver=" | cut -d \" -f 2`
 197
 198                 if test -z "$kernsrcver"; then
 199                         AC_MSG_RESULT([Not found])
 200                         AC_MSG_ERROR([*** Cannot determine kernel version.])
 201                 fi
 202         else
 203                 AC_MSG_RESULT([Not found])
 204                 if test "x$enable_linux_builtin" != xyes; then
 205                         AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
 206                 else
 207                         AC_MSG_ERROR([
 208         *** Cannot find UTS_RELEASE definition.
 209         *** Please run 'make prepare' inside the kernel source tree.])
 210                 fi
 211         fi
 212
 213         AC_MSG_RESULT([$kernsrcver])
 214
 215         LINUX=${kernelsrc}
 216         LINUX_OBJ=${kernelbuild}
 217         LINUX_VERSION=${kernsrcver}
 218
 219         AC_SUBST(LINUX)
 220         AC_SUBST(LINUX_OBJ)
 221         AC_SUBST(LINUX_VERSION)
 222
 223         SPL_AC_MODULE_SYMVERS
 224 ])
 225
 226 dnl #
 227 dnl # Default SPL user configuration
 228 dnl #
 229 AC_DEFUN([SPL_AC_CONFIG_USER], [])
 230
 231 dnl #
 232 dnl # Check for rpm+rpmbuild to build RPM packages.  If these tools
 233 dnl # are missing it is non-fatal but you will not be able to build
 234 dnl # RPM packages and will be warned if you try too.
 235 dnl #
 236 AC_DEFUN([SPL_AC_RPM], [
 237         RPM=rpm
 238         RPMBUILD=rpmbuild
 239
 240         AC_MSG_CHECKING([whether $RPM is available])
 241         AS_IF([tmp=$($RPM --version 2>/dev/null)], [
 242                 RPM_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
 243                 HAVE_RPM=yes
 244                 AC_MSG_RESULT([$HAVE_RPM ($RPM_VERSION)])
 245         ],[
 246                 HAVE_RPM=no
 247                 AC_MSG_RESULT([$HAVE_RPM])
 248         ])
 249
 250         AC_MSG_CHECKING([whether $RPMBUILD is available])
 251         AS_IF([tmp=$($RPMBUILD --version 2>/dev/null)], [
 252                 RPMBUILD_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
 253                 HAVE_RPMBUILD=yes
 254                 AC_MSG_RESULT([$HAVE_RPMBUILD ($RPMBUILD_VERSION)])
 255         ],[
 256                 HAVE_RPMBUILD=no
 257                 AC_MSG_RESULT([$HAVE_RPMBUILD])
 258         ])
 259
 260         AC_SUBST(HAVE_RPM)
 261         AC_SUBST(RPM)
 262         AC_SUBST(RPM_VERSION)
 263
 264         AC_SUBST(HAVE_RPMBUILD)
 265         AC_SUBST(RPMBUILD)
 266         AC_SUBST(RPMBUILD_VERSION)
 267 ])
 268
 269 dnl #
 270 dnl # Check for dpkg+dpkg-buildpackage to build DEB packages.  If these
 271 dnl # tools are missing it is non-fatal but you will not be able to build
 272 dnl # DEB packages and will be warned if you try too.
 273 dnl #
 274 AC_DEFUN([SPL_AC_DPKG], [
 275         DPKG=dpkg
 276         DPKGBUILD=dpkg-buildpackage
 277
 278         AC_MSG_CHECKING([whether $DPKG is available])
 279         AS_IF([tmp=$($DPKG --version 2>/dev/null)], [
 280                 DPKG_VERSION=$(echo $tmp | $AWK '/Debian/ { print $[7] }')
 281                 HAVE_DPKG=yes
 282                 AC_MSG_RESULT([$HAVE_DPKG ($DPKG_VERSION)])
 283         ],[
 284                 HAVE_DPKG=no
 285                 AC_MSG_RESULT([$HAVE_DPKG])
 286         ])
 287
 288         AC_MSG_CHECKING([whether $DPKGBUILD is available])
 289         AS_IF([tmp=$($DPKGBUILD --version 2>/dev/null)], [
 290                 DPKGBUILD_VERSION=$(echo $tmp | \
 291                     $AWK '/Debian/ { print $[4] }' | cut -f-4 -d'.')
 292                 HAVE_DPKGBUILD=yes
 293                 AC_MSG_RESULT([$HAVE_DPKGBUILD ($DPKGBUILD_VERSION)])
 294         ],[
 295                 HAVE_DPKGBUILD=no
 296                 AC_MSG_RESULT([$HAVE_DPKGBUILD])
 297         ])
 298
 299         AC_SUBST(HAVE_DPKG)
 300         AC_SUBST(DPKG)
 301         AC_SUBST(DPKG_VERSION)
 302
 303         AC_SUBST(HAVE_DPKGBUILD)
 304         AC_SUBST(DPKGBUILD)
 305         AC_SUBST(DPKGBUILD_VERSION)
 306 ])
 307
 308 dnl #
 309 dnl # Until native packaging for various different packing systems
 310 dnl # can be added the least we can do is attempt to use alien to
 311 dnl # convert the RPM packages to the needed package type.  This is
 312 dnl # a hack but so far it has worked reasonable well.
 313 dnl #
 314 AC_DEFUN([SPL_AC_ALIEN], [
 315         ALIEN=alien
 316
 317         AC_MSG_CHECKING([whether $ALIEN is available])
 318         AS_IF([tmp=$($ALIEN --version 2>/dev/null)], [
 319                 ALIEN_VERSION=$(echo $tmp | $AWK '{ print $[3] }')
 320                 HAVE_ALIEN=yes
 321                 AC_MSG_RESULT([$HAVE_ALIEN ($ALIEN_VERSION)])
 322         ],[
 323                 HAVE_ALIEN=no
 324                 AC_MSG_RESULT([$HAVE_ALIEN])
 325         ])
 326
 327         AC_SUBST(HAVE_ALIEN)
 328         AC_SUBST(ALIEN)
 329         AC_SUBST(ALIEN_VERSION)
 330 ])
 331
 332 dnl #
 333 dnl # Using the VENDOR tag from config.guess set the default
 334 dnl # package type for 'make pkg': (rpm | deb | tgz)
 335 dnl #
 336 AC_DEFUN([SPL_AC_DEFAULT_PACKAGE], [
 337         AC_MSG_CHECKING([linux distribution])
 338         if test -f /etc/toss-release ; then
 339                 VENDOR=toss ;
 340         elif test -f /etc/fedora-release ; then
 341                 VENDOR=fedora ;
 342         elif test -f /etc/redhat-release ; then
 343                 VENDOR=redhat ;
 344         elif test -f /etc/gentoo-release ; then
 345                 VENDOR=gentoo ;
 346         elif test -f /etc/arch-release ; then
 347                 VENDOR=arch ;
 348         elif test -f /etc/SuSE-release ; then
 349                 VENDOR=sles ;
 350         elif test -f /etc/slackware-version ; then
 351                 VENDOR=slackware ;
 352         elif test -f /etc/lunar.release ; then
 353                 VENDOR=lunar ;
 354         elif test -f /etc/lsb-release ; then
 355                 VENDOR=ubuntu ;
 356         elif test -f /etc/debian_version ; then
 357                 VENDOR=debian ;
 358         else
 359                 VENDOR= ;
 360         fi
 361         AC_MSG_RESULT([$VENDOR])
 362         AC_SUBST(VENDOR)
 363
 364         AC_MSG_CHECKING([default package type])
 365         case "$VENDOR" in
 366                 toss)       DEFAULT_PACKAGE=rpm  ;;
 367                 redhat)     DEFAULT_PACKAGE=rpm  ;;
 368                 fedora)     DEFAULT_PACKAGE=rpm  ;;
 369                 gentoo)     DEFAULT_PACKAGE=tgz  ;;
 370                 arch)       DEFAULT_PACKAGE=tgz  ;;
 371                 sles)       DEFAULT_PACKAGE=rpm  ;;
 372                 slackware)  DEFAULT_PACKAGE=tgz  ;;
 373                 lunar)      DEFAULT_PACKAGE=tgz  ;;
 374                 ubuntu)     DEFAULT_PACKAGE=deb  ;;
 375                 debian)     DEFAULT_PACKAGE=deb  ;;
 376                 *)          DEFAULT_PACKAGE=rpm  ;;
 377         esac
 378
 379         AC_MSG_RESULT([$DEFAULT_PACKAGE])
 380         AC_SUBST(DEFAULT_PACKAGE)
 381 ])
 382
 383 dnl #
 384 dnl # Default SPL user configuration
 385 dnl #
 386 AC_DEFUN([SPL_AC_PACKAGE], [
 387         SPL_AC_DEFAULT_PACKAGE
 388         SPL_AC_RPM
 389         SPL_AC_DPKG
 390         SPL_AC_ALIEN
 391 ])
 392
 393 AC_DEFUN([SPL_AC_LICENSE], [
 394         AC_MSG_CHECKING([spl license])
 395         LICENSE=GPL
 396         AC_MSG_RESULT([$LICENSE])
 397         KERNELCPPFLAGS="${KERNELCPPFLAGS} -DHAVE_GPL_ONLY_SYMBOLS"
 398         AC_SUBST(LICENSE)
 399 ])
 400
 401 AC_DEFUN([SPL_AC_CONFIG], [
 402         SPL_CONFIG=all
 403         AC_ARG_WITH([config],
 404                 AS_HELP_STRING([--with-config=CONFIG],
 405                 [Config file 'kernel|user|all|srpm']),
 406                 [SPL_CONFIG="$withval"])
 407         AC_ARG_ENABLE([linux-builtin],
 408                 [AC_HELP_STRING([--enable-linux-builtin],
 409                 [Configure for builtin in-tree kernel modules @<:@default=no@:>@])],
 410                 [],
 411                 [enable_linux_builtin=no])
 412
 413         AC_MSG_CHECKING([spl config])
 414         AC_MSG_RESULT([$SPL_CONFIG]);
 415         AC_SUBST(SPL_CONFIG)
 416
 417         case "$SPL_CONFIG" in
 418                 kernel) SPL_AC_CONFIG_KERNEL ;;
 419                 user)   SPL_AC_CONFIG_USER   ;;
 420                 all)    SPL_AC_CONFIG_KERNEL
 421                         SPL_AC_CONFIG_USER   ;;
 422                 srpm)                        ;;
 423                 *)
 424                 AC_MSG_RESULT([Error!])
 425                 AC_MSG_ERROR([Bad value "$SPL_CONFIG" for --with-config,
 426                              user kernel|user|all|srpm]) ;;
 427         esac
 428
 429         AM_CONDITIONAL([CONFIG_USER],
 430                        [test "$SPL_CONFIG" = user -o "$SPL_CONFIG" = all])
 431         AM_CONDITIONAL([CONFIG_KERNEL],
 432                        [test "$SPL_CONFIG" = kernel -o "$SPL_CONFIG" = all] &&
 433                        [test "x$enable_linux_builtin" != xyes ])
 434 ])
 435
 436 dnl #
 437 dnl # Enable if the SPL should be compiled with internal debugging enabled.
 438 dnl # By default this support is disabled.
 439 dnl #
 440 AC_DEFUN([SPL_AC_DEBUG], [
 441         AC_MSG_CHECKING([whether debugging is enabled])
 442         AC_ARG_ENABLE([debug],
 443                 [AS_HELP_STRING([--enable-debug],
 444                 [Enable generic debug support @<:@default=no@:>@])],
 445                 [],
 446                 [enable_debug=no])
 447
 448         AS_IF([test "x$enable_debug" = xyes],
 449         [
 450                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG -Werror"
 451                 DEBUG_CFLAGS="-DDEBUG -Werror"
 452                 DEBUG_SPL="_with_debug"
 453         ], [
 454                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DNDEBUG"
 455                 DEBUG_CFLAGS="-DNDEBUG"
 456                 DEBUG_SPL="_without_debug"
 457         ])
 458
 459         AC_SUBST(DEBUG_CFLAGS)
 460         AC_SUBST(DEBUG_SPL)
 461         AC_MSG_RESULT([$enable_debug])
 462 ])
 463
 464 dnl #
 465 dnl # Enabled by default it provides a basic debug log infrastructure.
 466 dnl # Each subsystem registers itself with a name and logs messages
 467 dnl # using predefined types.  If the debug mask it set to allow the
 468 dnl # message type it will be written to the internal log.  The log
 469 dnl # can be dumped to a file by echoing 1 to the 'dump' proc entry,
 470 dnl # after dumping the log it must be decoded using the spl utility.
 471 dnl #
 472 dnl # echo 1 >/proc/sys/kernel/spl/debug/dump
 473 dnl # spl /tmp/spl-log.xxx.yyy /tmp/spl-log.xxx.yyy.txt
 474 dnl #
 475 AC_DEFUN([SPL_AC_DEBUG_LOG], [
 476         AC_ARG_ENABLE([debug-log],
 477                 [AS_HELP_STRING([--enable-debug-log],
 478                 [Enable basic debug logging @<:@default=yes@:>@])],
 479                 [],
 480                 [enable_debug_log=yes])
 481
 482         AS_IF([test "x$enable_debug_log" = xyes],
 483         [
 484                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_LOG"
 485                 DEBUG_LOG="_with_debug_log"
 486                 AC_DEFINE([DEBUG_LOG], [1],
 487                 [Define to 1 to enable basic debug logging])
 488         ], [
 489                 DEBUG_LOG="_without_debug_log"
 490         ])
 491
 492         AC_SUBST(DEBUG_LOG)
 493         AC_MSG_CHECKING([whether basic debug logging is enabled])
 494         AC_MSG_RESULT([$enable_debug_log])
 495 ])
 496
 497 dnl #
 498 dnl # Enabled by default it provides a minimal level of memory tracking.
 499 dnl # A total count of bytes allocated is kept for each alloc and free.
 500 dnl # Then at module unload time a report to the console will be printed
 501 dnl # if memory was leaked.  Additionally, /proc/spl/kmem/slab will exist
 502 dnl # and provide an easy way to inspect the kmem based slab.
 503 dnl #
 504 AC_DEFUN([SPL_AC_DEBUG_KMEM], [
 505         AC_ARG_ENABLE([debug-kmem],
 506                 [AS_HELP_STRING([--enable-debug-kmem],
 507                 [Enable basic kmem accounting @<:@default=yes@:>@])],
 508                 [],
 509                 [enable_debug_kmem=yes])
 510
 511         AS_IF([test "x$enable_debug_kmem" = xyes],
 512         [
 513                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM"
 514                 DEBUG_KMEM="_with_debug_kmem"
 515                 AC_DEFINE([DEBUG_KMEM], [1],
 516                 [Define to 1 to enable basic kmem accounting])
 517         ], [
 518                 DEBUG_KMEM="_without_debug_kmem"
 519         ])
 520
 521         AC_SUBST(DEBUG_KMEM)
 522         AC_MSG_CHECKING([whether basic kmem accounting is enabled])
 523         AC_MSG_RESULT([$enable_debug_kmem])
 524 ])
 525
 526 dnl #
 527 dnl # Disabled by default it provides detailed memory tracking.  This
 528 dnl # feature also requires --enable-debug-kmem to be set.  When enabled
 529 dnl # not only will total bytes be tracked but also the location of every
 530 dnl # alloc and free.  When the SPL module is unloaded a list of all leaked
 531 dnl # addresses and where they were allocated will be dumped to the console.
 532 dnl # Enabling this feature has a significant impact on performance but it
 533 dnl # makes finding memory leaks pretty straight forward.
 534 dnl #
 535 AC_DEFUN([SPL_AC_DEBUG_KMEM_TRACKING], [
 536         AC_ARG_ENABLE([debug-kmem-tracking],
 537                 [AS_HELP_STRING([--enable-debug-kmem-tracking],
 538                 [Enable detailed kmem tracking  @<:@default=no@:>@])],
 539                 [],
 540                 [enable_debug_kmem_tracking=no])
 541
 542         AS_IF([test "x$enable_debug_kmem_tracking" = xyes],
 543         [
 544                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM_TRACKING"
 545                 DEBUG_KMEM_TRACKING="_with_debug_kmem_tracking"
 546                 AC_DEFINE([DEBUG_KMEM_TRACKING], [1],
 547                 [Define to 1 to enable detailed kmem tracking])
 548         ], [
 549                 DEBUG_KMEM_TRACKING="_without_debug_kmem_tracking"
 550         ])
 551
 552         AC_SUBST(DEBUG_KMEM_TRACKING)
 553         AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
 554         AC_MSG_RESULT([$enable_debug_kmem_tracking])
 555 ])
 556
 557 dnl #
 558 dnl # SPL_LINUX_CONFTEST
 559 dnl #
 560 AC_DEFUN([SPL_LINUX_CONFTEST], [
 561 cat confdefs.h - <<_ACEOF >conftest.c
 562 $1
 563 _ACEOF
 564 ])
 565
 566 dnl #
 567 dnl # SPL_LANG_PROGRAM(C)([PROLOGUE], [BODY])
 568 dnl #
 569 m4_define([SPL_LANG_PROGRAM], [
 570 $1
 571 int
 572 main (void)
 573 {
 574 dnl Do *not* indent the following line: there may be CPP directives.
 575 dnl Don't move the `;' right after for the same reason.
 576 $2
 577   ;
 578   return 0;
 579 }
 580 ])
 581
 582 dnl #
 583 dnl # SPL_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
 584 dnl #
 585 AC_DEFUN([SPL_LINUX_COMPILE_IFELSE], [
 586         m4_ifvaln([$1], [SPL_LINUX_CONFTEST([$1])])
 587         rm -Rf build && mkdir -p build && touch build/conftest.mod.c
 588         echo "obj-m := conftest.o" >build/Makefile
 589         modpost_flag=''
 590         test "x$enable_linux_builtin" = xyes && modpost_flag='modpost=true' # fake modpost stage
 591         AS_IF(
 592                 [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 $modpost_flag) >/dev/null && AC_TRY_COMMAND([$3])],
 593                 [$4],
 594                 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
 595         )
 596         rm -Rf build
 597 ])
 598
 599 dnl #
 600 dnl # SPL_LINUX_TRY_COMPILE like AC_TRY_COMPILE
 601 dnl #
 602 AC_DEFUN([SPL_LINUX_TRY_COMPILE],
 603         [SPL_LINUX_COMPILE_IFELSE(
 604         [AC_LANG_SOURCE([SPL_LANG_PROGRAM([[$1]], [[$2]])])],
 605         [modules],
 606         [test -s build/conftest.o],
 607         [$3], [$4])
 608 ])
 609
 610 dnl #
 611 dnl # SPL_CHECK_SYMBOL_EXPORT
 612 dnl # check symbol exported or not
 613 dnl #
 614 AC_DEFUN([SPL_CHECK_SYMBOL_EXPORT], [
 615         grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
 616                 $LINUX_OBJ/Module*.symvers 2>/dev/null
 617         rc=$?
 618         if test $rc -ne 0; then
 619                 export=0
 620                 for file in $2; do
 621                         grep -q -E "EXPORT_SYMBOL.*($1)" \
 622                                 "$LINUX_OBJ/$file" 2>/dev/null
 623                         rc=$?
 624                         if test $rc -eq 0; then
 625                                 export=1
 626                                 break;
 627                         fi
 628                 done
 629                 if test $export -eq 0; then :
 630                         $4
 631                 else :
 632                         $3
 633                 fi
 634         else :
 635                 $3
 636         fi
 637 ])
 638
 639 dnl #
 640 dnl # SPL_LINUX_TRY_COMPILE_SYMBOL
 641 dnl # like SPL_LINUX_TRY_COMPILE, except SPL_CHECK_SYMBOL_EXPORT
 642 dnl # is called if not compiling for builtin
 643 dnl #
 644 AC_DEFUN([SPL_LINUX_TRY_COMPILE_SYMBOL], [
 645         SPL_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
 646         if test $rc -ne 0; then :
 647                 $6
 648         else
 649                 if test "x$enable_linux_builtin" != xyes; then
 650                         SPL_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
 651                 fi
 652                 if test $rc -ne 0; then :
 653                         $6
 654                 else :
 655                         $5
 656                 fi
 657         fi
 658 ])
 659
 660 dnl #
 661 dnl # SPL_CHECK_SYMBOL_HEADER
 662 dnl # check if a symbol prototype is defined in listed headers.
 663 dnl #
 664 AC_DEFUN([SPL_CHECK_SYMBOL_HEADER], [
 665         AC_MSG_CHECKING([whether symbol $1 exists in header])
 666         header=0
 667         for file in $3; do
 668                 grep -q "$2" "$LINUX/$file" 2>/dev/null
 669                 rc=$?
 670                 if test $rc -eq 0; then
 671                         header=1
 672                         break;
 673                 fi
 674         done
 675         if test $header -eq 0; then
 676                 AC_MSG_RESULT([no])
 677                 $5
 678         else
 679                 AC_MSG_RESULT([yes])
 680                 $4
 681         fi
 682 ])
 683
 684 dnl #
 685 dnl # SPL_CHECK_HEADER
 686 dnl # check whether header exists and define HAVE_$2_HEADER
 687 dnl #
 688 AC_DEFUN([SPL_CHECK_HEADER],
 689         [AC_MSG_CHECKING([whether header $1 exists])
 690         SPL_LINUX_TRY_COMPILE([
 691                 #include <$1>
 692         ],[
 693                 return 0;
 694         ],[
 695                 AC_DEFINE(HAVE_$2_HEADER, 1, [$1 exists])
 696                 AC_MSG_RESULT(yes)
 697                 $3
 698         ],[
 699                 AC_MSG_RESULT(no)
 700                 $4
 701         ])
 702 ])
 703
 704 dnl #
 705 dnl # Basic toolchain sanity check.
 706 dnl #
 707 AC_DEFUN([SPL_AC_TEST_MODULE],
 708         [AC_MSG_CHECKING([whether modules can be built])
 709         SPL_LINUX_TRY_COMPILE([],[],[
 710                 AC_MSG_RESULT([yes])
 711         ],[
 712                 AC_MSG_RESULT([no])
 713                 if test "x$enable_linux_builtin" != xyes; then
 714                         AC_MSG_ERROR([*** Unable to build an empty module.])
 715                 else
 716                         AC_MSG_ERROR([
 717         *** Unable to build an empty module.
 718         *** Please run 'make scripts' inside the kernel source tree.])
 719                 fi
 720         ])
 721 ])
 722
 723 dnl #
 724 dnl # Use the atomic implemenation based on global spinlocks.  This
 725 dnl # should only be needed by 32-bit kernels which do not provide
 726 dnl # the atomic64_* API.  It may be optionally enabled as a fallback
 727 dnl # if problems are observed with the direct mapping to the native
 728 dnl # Linux atomic operations.  You may not disable atomic spinlocks
 729 dnl # if you kernel does not an atomic64_* API.
 730 dnl #
 731 AC_DEFUN([SPL_AC_ATOMIC_SPINLOCK], [
 732         AC_ARG_ENABLE([atomic-spinlocks],
 733                 [AS_HELP_STRING([--enable-atomic-spinlocks],
 734                 [Atomic types use spinlocks @<:@default=check@:>@])],
 735                 [],
 736                 [enable_atomic_spinlocks=check])
 737
 738         SPL_LINUX_TRY_COMPILE([
 739                 #include <linux/fs.h>
 740         ],[
 741                 atomic64_t *ptr __attribute__ ((unused));
 742         ],[
 743                 have_atomic64_t=yes
 744                 AC_DEFINE(HAVE_ATOMIC64_T, 1,
 745                         [kernel defines atomic64_t])
 746         ],[
 747                 have_atomic64_t=no
 748         ])
 749
 750         AS_IF([test "x$enable_atomic_spinlocks" = xcheck], [
 751                 AS_IF([test "x$have_atomic64_t" = xyes], [
 752                         enable_atomic_spinlocks=no
 753                 ],[
 754                         enable_atomic_spinlocks=yes
 755                 ])
 756         ])
 757
 758         AS_IF([test "x$enable_atomic_spinlocks" = xyes], [
 759                 AC_DEFINE([ATOMIC_SPINLOCK], [1],
 760                         [Atomic types use spinlocks])
 761         ],[
 762                 AS_IF([test "x$have_atomic64_t" = xno], [
 763                         AC_MSG_FAILURE(
 764                         [--disable-atomic-spinlocks given but required atomic64 support is unavailable])
 765                 ])
 766         ])
 767
 768         AC_MSG_CHECKING([whether atomic types use spinlocks])
 769         AC_MSG_RESULT([$enable_atomic_spinlocks])
 770
 771         AC_MSG_CHECKING([whether kernel defines atomic64_t])
 772         AC_MSG_RESULT([$have_atomic64_t])
 773 ])
 774
 775 dnl #
 776 dnl # 2.6.24 API change,
 777 dnl # check if atomic64_cmpxchg is defined
 778 dnl #
 779 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_CMPXCHG],
 780         [AC_MSG_CHECKING([whether kernel defines atomic64_cmpxchg])
 781         SPL_LINUX_TRY_COMPILE([
 782                 #include <linux/fs.h>
 783         ],[
 784                 atomic64_cmpxchg((atomic64_t *)NULL, 0, 0);
 785         ],[
 786                 AC_MSG_RESULT([yes])
 787                 AC_DEFINE(HAVE_ATOMIC64_CMPXCHG, 1,
 788                           [kernel defines atomic64_cmpxchg])
 789         ],[
 790                 AC_MSG_RESULT([no])
 791         ])
 792 ])
 793
 794 dnl #
 795 dnl # 2.6.24 API change,
 796 dnl # check if atomic64_xchg is defined
 797 dnl #
 798 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_XCHG],
 799         [AC_MSG_CHECKING([whether kernel defines atomic64_xchg])
 800         SPL_LINUX_TRY_COMPILE([
 801                 #include <linux/fs.h>
 802         ],[
 803                 atomic64_xchg((atomic64_t *)NULL, 0);
 804         ],[
 805                 AC_MSG_RESULT([yes])
 806                 AC_DEFINE(HAVE_ATOMIC64_XCHG, 1,
 807                           [kernel defines atomic64_xchg])
 808         ],[
 809                 AC_MSG_RESULT([no])
 810         ])
 811 ])
 812
 813 dnl #
 814 dnl # 2.6.24 API change,
 815 dnl # check if uintptr_t typedef is defined
 816 dnl #
 817 AC_DEFUN([SPL_AC_TYPE_UINTPTR_T],
 818         [AC_MSG_CHECKING([whether kernel defines uintptr_t])
 819         SPL_LINUX_TRY_COMPILE([
 820                 #include <linux/types.h>
 821         ],[
 822                 uintptr_t *ptr __attribute__ ((unused));
 823         ],[
 824                 AC_MSG_RESULT([yes])
 825                 AC_DEFINE(HAVE_UINTPTR_T, 1,
 826                           [kernel defines uintptr_t])
 827         ],[
 828                 AC_MSG_RESULT([no])
 829         ])
 830 ])
 831
 832 dnl #
 833 dnl # 2.6.21 API change,
 834 dnl # 'register_sysctl_table' use only one argument instead of two
 835 dnl #
 836 AC_DEFUN([SPL_AC_2ARGS_REGISTER_SYSCTL],
 837         [AC_MSG_CHECKING([whether register_sysctl_table() wants 2 args])
 838         SPL_LINUX_TRY_COMPILE([
 839                 #include <linux/sysctl.h>
 840         ],[
 841                 (void) register_sysctl_table(NULL, 0);
 842         ],[
 843                 AC_MSG_RESULT(yes)
 844                 AC_DEFINE(HAVE_2ARGS_REGISTER_SYSCTL, 1,
 845                           [register_sysctl_table() wants 2 args])
 846         ],[
 847                 AC_MSG_RESULT(no)
 848         ])
 849 ])
 850
 851 dnl #
 852 dnl # 2.6.23 API change
 853 dnl # Old set_shrinker API replaced with register_shrinker
 854 dnl #
 855 AC_DEFUN([SPL_AC_SET_SHRINKER], [
 856         AC_MSG_CHECKING([whether set_shrinker() available])
 857         SPL_LINUX_TRY_COMPILE([
 858                 #include <linux/mm.h>
 859         ],[
 860                 return set_shrinker(DEFAULT_SEEKS, NULL);
 861         ],[
 862                 AC_MSG_RESULT([yes])
 863                 AC_DEFINE(HAVE_SET_SHRINKER, 1,
 864                           [set_shrinker() available])
 865         ],[
 866                 AC_MSG_RESULT([no])
 867         ])
 868 ])
 869
 870 dnl #
 871 dnl # 2.6.35 API change,
 872 dnl # Add context to shrinker callback
 873 dnl #
 874 AC_DEFUN([SPL_AC_3ARGS_SHRINKER_CALLBACK],
 875         [AC_MSG_CHECKING([whether shrinker callback wants 3 args])
 876         tmp_flags="$EXTRA_KCFLAGS"
 877         EXTRA_KCFLAGS="-Werror"
 878         SPL_LINUX_TRY_COMPILE([
 879                 #include <linux/mm.h>
 880
 881                 int shrinker_cb(struct shrinker *, int, unsigned int);
 882         ],[
 883                 struct shrinker cache_shrinker = {
 884                         .shrink = shrinker_cb,
 885                         .seeks = DEFAULT_SEEKS,
 886                 };
 887                 register_shrinker(&cache_shrinker);
 888         ],[
 889                 AC_MSG_RESULT(yes)
 890                 AC_DEFINE(HAVE_3ARGS_SHRINKER_CALLBACK, 1,
 891                           [shrinker callback wants 3 args])
 892         ],[
 893                 AC_MSG_RESULT(no)
 894         ])
 895         EXTRA_KCFLAGS="$tmp_flags"
 896 ])
 897
 898 dnl #
 899 dnl # 2.6.25 API change,
 900 dnl # struct path entry added to struct nameidata
 901 dnl #
 902 AC_DEFUN([SPL_AC_PATH_IN_NAMEIDATA],
 903         [AC_MSG_CHECKING([whether struct path used in struct nameidata])
 904         SPL_LINUX_TRY_COMPILE([
 905                 #include <linux/namei.h>
 906         ],[
 907                 struct nameidata nd __attribute__ ((unused));
 908
 909                 nd.path.mnt = NULL;
 910                 nd.path.dentry = NULL;
 911         ],[
 912                 AC_MSG_RESULT(yes)
 913                 AC_DEFINE(HAVE_PATH_IN_NAMEIDATA, 1,
 914                           [struct path used in struct nameidata])
 915         ],[
 916                 AC_MSG_RESULT(no)
 917         ])
 918 ])
 919
 920 dnl #
 921 dnl # Custom SPL patch may export this system it is not required
 922 dnl #
 923 AC_DEFUN([SPL_AC_TASK_CURR],
 924         [AC_MSG_CHECKING([whether task_curr() is available])
 925         SPL_LINUX_TRY_COMPILE_SYMBOL([
 926                 #include <linux/sched.h>
 927         ], [
 928                 task_curr(NULL);
 929         ], [task_curr], [kernel/sched.c], [
 930                 AC_MSG_RESULT(yes)
 931                 AC_DEFINE(HAVE_TASK_CURR, 1, [task_curr() is available])
 932         ], [
 933                 AC_MSG_RESULT(no)
 934         ])
 935 ])
 936
 937 dnl #
 938 dnl # 2.6.19 API change,
 939 dnl # Use CTL_UNNUMBERED when binary sysctl is not required
 940 dnl #
 941 AC_DEFUN([SPL_AC_CTL_UNNUMBERED],
 942         [AC_MSG_CHECKING([whether unnumbered sysctl support exists])
 943         SPL_LINUX_TRY_COMPILE([
 944                 #include <linux/sysctl.h>
 945         ],[
 946                 #ifndef CTL_UNNUMBERED
 947                 #error CTL_UNNUMBERED undefined
 948                 #endif
 949         ],[
 950                 AC_MSG_RESULT(yes)
 951                 AC_DEFINE(HAVE_CTL_UNNUMBERED, 1,
 952                           [unnumbered sysctl support exists])
 953         ],[
 954                 AC_MSG_RESULT(no)
 955         ])
 956 ])
 957
 958 dnl #
 959 dnl # 2.6.33 API change,
 960 dnl # Removed .ctl_name from struct ctl_table.
 961 dnl #
 962 AC_DEFUN([SPL_AC_CTL_NAME], [
 963         AC_MSG_CHECKING([whether struct ctl_table has ctl_name])
 964         SPL_LINUX_TRY_COMPILE([
 965                 #include <linux/sysctl.h>
 966         ],[
 967                 struct ctl_table ctl __attribute__ ((unused));
 968                 ctl.ctl_name = 0;
 969         ],[
 970                 AC_MSG_RESULT(yes)
 971                 AC_DEFINE(HAVE_CTL_NAME, 1, [struct ctl_table has ctl_name])
 972         ],[
 973                 AC_MSG_RESULT(no)
 974         ])
 975 ])
 976
 977 dnl #
 978 dnl # 2.6.16 API change.
 979 dnl # Check if 'fls64()' is available
 980 dnl #
 981 AC_DEFUN([SPL_AC_FLS64],
 982         [AC_MSG_CHECKING([whether fls64() is available])
 983         SPL_LINUX_TRY_COMPILE([
 984                 #include <linux/bitops.h>
 985         ],[
 986                 return fls64(0);
 987         ],[
 988                 AC_MSG_RESULT(yes)
 989                 AC_DEFINE(HAVE_FLS64, 1, [fls64() is available])
 990         ],[
 991                 AC_MSG_RESULT(no)
 992         ])
 993 ])
 994
 995 dnl #
 996 dnl # 2.6.18 API change, check whether device_create() is available.
 997 dnl # Device_create() was introduced in 2.6.18 and depricated
 998 dnl # class_device_create() which was fully removed in 2.6.26.
 999 dnl #
1000 AC_DEFUN([SPL_AC_DEVICE_CREATE],
1001         [AC_MSG_CHECKING([whether device_create() is available])
1002         SPL_CHECK_SYMBOL_EXPORT([device_create], [drivers/base/core.c], [
1003                 AC_MSG_RESULT(yes)
1004                 AC_DEFINE(HAVE_DEVICE_CREATE, 1,
1005                           [device_create() is available])
1006         ], [
1007                 AC_MSG_RESULT(no)
1008         ])
1009 ])
1010
1011 dnl #
1012 dnl # 2.6.27 API change,
1013 dnl # device_create() uses 5 args, new 'drvdata' argument.
1014 dnl #
1015 AC_DEFUN([SPL_AC_5ARGS_DEVICE_CREATE], [
1016         AC_MSG_CHECKING([whether device_create() wants 5 args])
1017         tmp_flags="$EXTRA_KCFLAGS"
1018         EXTRA_KCFLAGS="-Werror"
1019         SPL_LINUX_TRY_COMPILE([
1020                 #include <linux/device.h>
1021         ],[
1022                 device_create(NULL, NULL, 0, NULL, "%d", 1);
1023         ],[
1024                 AC_MSG_RESULT(yes)
1025                 AC_DEFINE(HAVE_5ARGS_DEVICE_CREATE, 1,
1026                           [device_create wants 5 args])
1027         ],[
1028                 AC_MSG_RESULT(no)
1029         ])
1030         EXTRA_KCFLAGS="$tmp_flags"
1031 ])
1032
1033 dnl #
1034 dnl # 2.6.13 API change, check whether class_device_create() is available.
1035 dnl # Class_device_create() was introduced in 2.6.13 and depricated
1036 dnl # class_simple_device_add() which was fully removed in 2.6.13.
1037 dnl #
1038 AC_DEFUN([SPL_AC_CLASS_DEVICE_CREATE],
1039         [AC_MSG_CHECKING([whether class_device_create() is available])
1040         SPL_LINUX_TRY_COMPILE_SYMBOL([
1041                 #include <linux/device.h>
1042         ], [
1043                 class_device_create(NULL, NULL, 0, NULL, NULL);
1044         ], [class_device_create], [drivers/base/class.c], [
1045                 AC_MSG_RESULT(yes)
1046                 AC_DEFINE(HAVE_CLASS_DEVICE_CREATE, 1,
1047                           [class_device_create() is available])
1048         ], [
1049                 AC_MSG_RESULT(no)
1050         ])
1051 ])
1052
1053 dnl #
1054 dnl # 2.6.26 API change, set_normalized_timespec() is exported.
1055 dnl #
1056 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT],
1057         [AC_MSG_CHECKING([whether set_normalized_timespec() is available as export])
1058         SPL_LINUX_TRY_COMPILE_SYMBOL([
1059                 #include <linux/time.h>
1060         ], [
1061                 set_normalized_timespec(NULL, 0, 0);
1062         ], [set_normalized_timespec], [kernel/time.c], [
1063                 AC_MSG_RESULT(yes)
1064                 AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_EXPORT, 1,
1065                           [set_normalized_timespec() is available as export])
1066         ], [
1067                 AC_MSG_RESULT(no)
1068         ])
1069 ])
1070
1071 dnl #
1072 dnl # 2.6.16 API change, set_normalize_timespec() moved to time.c
1073 dnl # previously it was available in time.h as an inline.
1074 dnl #
1075 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE], [
1076         AC_MSG_CHECKING([whether set_normalized_timespec() is an inline])
1077         SPL_LINUX_TRY_COMPILE([
1078                 #include <linux/time.h>
1079                 void set_normalized_timespec(struct timespec *ts,
1080                                              time_t sec, long nsec) { }
1081         ],
1082         [],
1083         [
1084                 AC_MSG_RESULT(no)
1085         ],[
1086                 AC_MSG_RESULT(yes)
1087                 AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_INLINE, 1,
1088                           [set_normalized_timespec() is available as inline])
1089         ])
1090 ])
1091
1092 dnl #
1093 dnl # 2.6.18 API change,
1094 dnl # timespec_sub() inline function available in linux/time.h
1095 dnl #
1096 AC_DEFUN([SPL_AC_TIMESPEC_SUB], [
1097         AC_MSG_CHECKING([whether timespec_sub() is available])
1098         SPL_LINUX_TRY_COMPILE([
1099                 #include <linux/time.h>
1100         ],[
1101                 struct timespec a = { 0 };
1102                 struct timespec b = { 0 };
1103                 struct timespec c __attribute__ ((unused));
1104                 c = timespec_sub(a, b);
1105         ],[
1106                 AC_MSG_RESULT(yes)
1107                 AC_DEFINE(HAVE_TIMESPEC_SUB, 1, [timespec_sub() is available])
1108         ],[
1109                 AC_MSG_RESULT(no)
1110         ])
1111 ])
1112
1113 dnl #
1114 dnl # 2.6.19 API change,
1115 dnl # check if init_utsname() is available in linux/utsname.h
1116 dnl #
1117 AC_DEFUN([SPL_AC_INIT_UTSNAME], [
1118         AC_MSG_CHECKING([whether init_utsname() is available])
1119         SPL_LINUX_TRY_COMPILE([
1120                 #include <linux/utsname.h>
1121         ],[
1122                 struct new_utsname *a __attribute__ ((unused));
1123                 a = init_utsname();
1124         ],[
1125                 AC_MSG_RESULT(yes)
1126                 AC_DEFINE(HAVE_INIT_UTSNAME, 1, [init_utsname() is available])
1127         ],[
1128                 AC_MSG_RESULT(no)
1129         ])
1130 ])
1131
1132 dnl #
1133 dnl # 2.6.18 API change,
1134 dnl # added linux/uaccess.h
1135 dnl #
1136 AC_DEFUN([SPL_AC_UACCESS_HEADER], [
1137         SPL_CHECK_HEADER([linux/uaccess.h], [UACCESS], [], [])
1138 ])
1139
1140 dnl #
1141 dnl # 2.6.12 API change,
1142 dnl # check whether 'kmalloc_node()' is available.
1143 dnl #
1144 AC_DEFUN([SPL_AC_KMALLOC_NODE], [
1145         AC_MSG_CHECKING([whether kmalloc_node() is available])
1146         SPL_LINUX_TRY_COMPILE([
1147                 #include <linux/slab.h>
1148         ],[
1149                 void *a __attribute__ ((unused));
1150                 a = kmalloc_node(1, GFP_KERNEL, 0);
1151         ],[
1152                 AC_MSG_RESULT(yes)
1153                 AC_DEFINE(HAVE_KMALLOC_NODE, 1, [kmalloc_node() is available])
1154         ],[
1155                 AC_MSG_RESULT(no)
1156         ])
1157 ])
1158
1159 dnl #
1160 dnl # 2.6.9 API change,
1161 dnl # check whether 'monotonic_clock()' is available it may
1162 dnl # be available for some archs but not others.
1163 dnl #
1164 AC_DEFUN([SPL_AC_MONOTONIC_CLOCK],
1165         [AC_MSG_CHECKING([whether monotonic_clock() is available])
1166         SPL_LINUX_TRY_COMPILE_SYMBOL([
1167                 #include <linux/timex.h>
1168         ], [
1169                 monotonic_clock();
1170         ], [monotonic_clock], [], [
1171                 AC_MSG_RESULT(yes)
1172                 AC_DEFINE(HAVE_MONOTONIC_CLOCK, 1,
1173                           [monotonic_clock() is available])
1174         ], [
1175                 AC_MSG_RESULT(no)
1176         ])
1177 ])
1178
1179 dnl #
1180 dnl # 2.6.16 API change,
1181 dnl # check whether 'struct inode' has i_mutex
1182 dnl #
1183 AC_DEFUN([SPL_AC_INODE_I_MUTEX], [
1184         AC_MSG_CHECKING([whether struct inode has i_mutex])
1185         SPL_LINUX_TRY_COMPILE([
1186                 #include <linux/fs.h>
1187                 #include <linux/mutex.h>
1188         ],[
1189                 struct inode i;
1190                 mutex_init(&i.i_mutex);
1191         ],[
1192                 AC_MSG_RESULT(yes)
1193                 AC_DEFINE(HAVE_INODE_I_MUTEX, 1, [struct inode has i_mutex])
1194         ],[
1195                 AC_MSG_RESULT(no)
1196         ])
1197 ])
1198
1199 dnl #
1200 dnl # 2.6.29 API change,
1201 dnl # Adaptive mutexs introduced.
1202 dnl #
1203 AC_DEFUN([SPL_AC_MUTEX_OWNER], [
1204         AC_MSG_CHECKING([whether struct mutex has owner])
1205         SPL_LINUX_TRY_COMPILE([
1206                 #include <linux/mutex.h>
1207         ],[
1208                 struct mutex mtx __attribute__ ((unused));
1209                 mtx.owner = NULL;
1210         ],[
1211                 AC_MSG_RESULT(yes)
1212                 AC_DEFINE(HAVE_MUTEX_OWNER, 1, [struct mutex has owner])
1213         ],[
1214                 AC_MSG_RESULT(no)
1215         ])
1216 ])
1217
1218 dnl #
1219 dnl # 2.6.39 API change,
1220 dnl # Owner type change.  A Linux mutex prior to 2.6.39 would store
1221 dnl # the owner as a thread_info pointer when CONFIG_DEBUG_MUTEXES
1222 dnl # was defined.  As of 2.6.39 this was changed to a task_struct
1223 dnl # pointer which frankly makes a lot more sense.
1224 dnl #
1225 AC_DEFUN([SPL_AC_MUTEX_OWNER_TASK_STRUCT], [
1226         AC_MSG_CHECKING([whether struct mutex owner is a task_struct])
1227         tmp_flags="$EXTRA_KCFLAGS"
1228         EXTRA_KCFLAGS="-Werror"
1229         SPL_LINUX_TRY_COMPILE([
1230                 #include <linux/mutex.h>
1231                 #include <linux/sched.h>
1232         ],[
1233                 struct mutex mtx __attribute__ ((unused));
1234                 mtx.owner = current;
1235         ],[
1236                 AC_MSG_RESULT(yes)
1237                 AC_DEFINE(HAVE_MUTEX_OWNER_TASK_STRUCT, 1,
1238                 [struct mutex owner is a task_struct])
1239         ],[
1240                 AC_MSG_RESULT(no)
1241         ])
1242         EXTRA_KCFLAGS="$tmp_flags"
1243 ])
1244
1245 dnl #
1246 dnl # 2.6.18 API change,
1247 dnl # First introduced 'mutex_lock_nested()' in include/linux/mutex.h,
1248 dnl # as part of the mutex validator.  Fallback to using 'mutex_lock()'
1249 dnl # if the mutex validator is disabled or otherwise unavailable.
1250 dnl #
1251 AC_DEFUN([SPL_AC_MUTEX_LOCK_NESTED], [
1252         AC_MSG_CHECKING([whether mutex_lock_nested() is available])
1253         SPL_LINUX_TRY_COMPILE([
1254                 #include <linux/mutex.h>
1255         ],[
1256                 struct mutex mutex;
1257                 mutex_init(&mutex);
1258                 mutex_lock_nested(&mutex, 0);
1259         ],[
1260                 AC_MSG_RESULT(yes)
1261                 AC_DEFINE(HAVE_MUTEX_LOCK_NESTED, 1,
1262                 [mutex_lock_nested() is available])
1263         ],[
1264                 AC_MSG_RESULT(no)
1265         ])
1266 ])
1267
1268 dnl #
1269 dnl # 2.6.27 API change,
1270 dnl # on_each_cpu() uses 3 args, no 'retry' argument
1271 dnl #
1272 AC_DEFUN([SPL_AC_3ARGS_ON_EACH_CPU], [
1273         AC_MSG_CHECKING([whether on_each_cpu() wants 3 args])
1274         SPL_LINUX_TRY_COMPILE([
1275                 #include <linux/interrupt.h>
1276                 #include <linux/smp.h>
1277
1278                 void on_each_cpu_func(void *data) { return; }
1279         ],[
1280                 on_each_cpu(on_each_cpu_func, NULL, 0);
1281         ],[
1282                 AC_MSG_RESULT(yes)
1283                 AC_DEFINE(HAVE_3ARGS_ON_EACH_CPU, 1,
1284                           [on_each_cpu wants 3 args])
1285         ],[
1286                 AC_MSG_RESULT(no)
1287         ])
1288 ])
1289
1290 dnl #
1291 dnl # 2.6.18 API change,
1292 dnl # kallsyms_lookup_name no longer exported
1293 dnl #
1294 AC_DEFUN([SPL_AC_KALLSYMS_LOOKUP_NAME],
1295         [AC_MSG_CHECKING([whether kallsyms_lookup_name() is available])
1296         SPL_LINUX_TRY_COMPILE_SYMBOL([
1297                 #include <linux/kallsyms.h>
1298         ], [
1299                 kallsyms_lookup_name(NULL);
1300         ], [kallsyms_lookup_name], [], [
1301                 AC_MSG_RESULT(yes)
1302                 AC_DEFINE(HAVE_KALLSYMS_LOOKUP_NAME, 1,
1303                           [kallsyms_lookup_name() is available])
1304         ], [
1305                 AC_MSG_RESULT(no)
1306         ])
1307 ])
1308
1309 dnl #
1310 dnl # Proposed API change,
1311 dnl # This symbol is not available in stock kernels.  You may build a
1312 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1313 dnl # these symbols for use.  If your already rolling a custom kernel for
1314 dnl # your environment this is recommended.
1315 dnl #
1316 AC_DEFUN([SPL_AC_GET_VMALLOC_INFO],
1317         [AC_MSG_CHECKING([whether get_vmalloc_info() is available])
1318         SPL_CHECK_SYMBOL_EXPORT([get_vmalloc_info], [], [
1319                 AC_MSG_RESULT(yes)
1320                 AC_DEFINE(HAVE_GET_VMALLOC_INFO, 1,
1321                           [get_vmalloc_info() is available])
1322         ], [
1323                 AC_MSG_RESULT(no)
1324         ])
1325 ])
1326
1327 dnl #
1328 dnl # 2.6.17 API change
1329 dnl # The helper functions first_online_pgdat(), next_online_pgdat(), and
1330 dnl # next_zone() are introduced to simplify for_each_zone().  These symbols
1331 dnl # were exported in 2.6.17 for use by modules which was consistent with
1332 dnl # the previous implementation of for_each_zone().  From 2.6.18 - 2.6.19
1333 dnl # the symbols were exported as 'unused', and by 2.6.20 they exports
1334 dnl # were dropped entirely leaving modules no way to directly iterate over
1335 dnl # the zone list.  Because we need access to the zone helpers we check
1336 dnl # if the kernel contains the old or new implementation.  Then we check
1337 dnl # to see if the symbols we need for each version are available.  If they
1338 dnl # are not, dynamically aquire the addresses with kallsyms_lookup_name().
1339 dnl #
1340 AC_DEFUN([SPL_AC_PGDAT_HELPERS], [
1341         AC_MSG_CHECKING([whether symbol *_pgdat exist])
1342         grep -q -E 'first_online_pgdat' $LINUX/include/linux/mmzone.h 2>/dev/null
1343         rc=$?
1344         if test $rc -eq 0; then
1345                 AC_MSG_RESULT([yes])
1346                 AC_DEFINE(HAVE_PGDAT_HELPERS, 1, [pgdat helpers are available])
1347         else
1348                 AC_MSG_RESULT([no])
1349         fi
1350 ])
1351
1352 dnl #
1353 dnl # Proposed API change,
1354 dnl # This symbol is not available in stock kernels.  You may build a
1355 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1356 dnl # these symbols for use.  If your already rolling a custom kernel for
1357 dnl # your environment this is recommended.
1358 dnl #
1359 AC_DEFUN([SPL_AC_FIRST_ONLINE_PGDAT],
1360         [AC_MSG_CHECKING([whether first_online_pgdat() is available])
1361         SPL_LINUX_TRY_COMPILE_SYMBOL([
1362                 #include <linux/mmzone.h>
1363         ], [
1364                 first_online_pgdat();
1365         ], [first_online_pgdat], [], [
1366                 AC_MSG_RESULT(yes)
1367                 AC_DEFINE(HAVE_FIRST_ONLINE_PGDAT, 1,
1368                           [first_online_pgdat() is available])
1369         ], [
1370                 AC_MSG_RESULT(no)
1371         ])
1372 ])
1373
1374 dnl #
1375 dnl # Proposed API change,
1376 dnl # This symbol is not available in stock kernels.  You may build a
1377 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1378 dnl # these symbols for use.  If your already rolling a custom kernel for
1379 dnl # your environment this is recommended.
1380 dnl #
1381 AC_DEFUN([SPL_AC_NEXT_ONLINE_PGDAT],
1382         [AC_MSG_CHECKING([whether next_online_pgdat() is available])
1383         SPL_LINUX_TRY_COMPILE_SYMBOL([
1384                 #include <linux/mmzone.h>
1385         ], [
1386                 next_online_pgdat(NULL);
1387         ], [next_online_pgdat], [], [
1388                 AC_MSG_RESULT(yes)
1389                 AC_DEFINE(HAVE_NEXT_ONLINE_PGDAT, 1,
1390                           [next_online_pgdat() is available])
1391         ], [
1392                 AC_MSG_RESULT(no)
1393         ])
1394 ])
1395
1396 dnl #
1397 dnl # Proposed API change,
1398 dnl # This symbol is not available in stock kernels.  You may build a
1399 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1400 dnl # these symbols for use.  If your already rolling a custom kernel for
1401 dnl # your environment this is recommended.
1402 dnl #
1403 AC_DEFUN([SPL_AC_NEXT_ZONE],
1404         [AC_MSG_CHECKING([whether next_zone() is available])
1405         SPL_LINUX_TRY_COMPILE_SYMBOL([
1406                 #include <linux/mmzone.h>
1407         ], [
1408                 next_zone(NULL);
1409         ], [next_zone], [], [
1410                 AC_MSG_RESULT(yes)
1411                 AC_DEFINE(HAVE_NEXT_ZONE, 1, [next_zone() is available])
1412         ], [
1413                 AC_MSG_RESULT(no)
1414         ])
1415 ])
1416
1417 dnl #
1418 dnl # 2.6.17 API change,
1419 dnl # See SPL_AC_PGDAT_HELPERS for details.
1420 dnl #
1421 AC_DEFUN([SPL_AC_PGDAT_LIST],
1422         [AC_MSG_CHECKING([whether pgdat_list is available])
1423         SPL_LINUX_TRY_COMPILE_SYMBOL([
1424                 #include <linux/topology.h>
1425                 pg_data_t *tmp = pgdat_list;
1426         ], [], [pgdat_list], [], [
1427                 AC_MSG_RESULT(yes)
1428                 AC_DEFINE(HAVE_PGDAT_LIST, 1, [pgdat_list is available])
1429         ], [
1430                 AC_MSG_RESULT(no)
1431         ])
1432 ])
1433
1434 dnl #
1435 dnl # 2.6.18 API change,
1436 dnl # First introduced global_page_state() support as an inline.
1437 dnl #
1438 AC_DEFUN([SPL_AC_GLOBAL_PAGE_STATE], [
1439         AC_MSG_CHECKING([whether global_page_state() is available])
1440         SPL_LINUX_TRY_COMPILE([
1441                 #include <linux/mm.h>
1442         ],[
1443                 unsigned long state __attribute__ ((unused));
1444                 state = global_page_state(0);
1445         ],[
1446                 AC_MSG_RESULT(yes)
1447                 AC_DEFINE(HAVE_GLOBAL_PAGE_STATE, 1,
1448                           [global_page_state() is available])
1449         ],[
1450                 AC_MSG_RESULT(no)
1451         ])
1452 ])
1453
1454 dnl #
1455 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1456 dnl # Public global zone stats now include a free page count.  However
1457 dnl # the enumerated names of the counters have changed since this API
1458 dnl # was introduced.  We need to deduce the corrent name to use.  This
1459 dnl # replaces the priviate get_zone_counts() interface.
1460 dnl #
1461 dnl # NR_FREE_PAGES was available from 2.6.21 to current kernels, which
1462 dnl # is 2.6.30 as of when this was written.
1463 dnl #
1464 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_FREE], [
1465         AC_MSG_CHECKING([whether page state NR_FREE_PAGES is available])
1466         SPL_LINUX_TRY_COMPILE([
1467                 #include <linux/mm.h>
1468         ],[
1469                 enum zone_stat_item zsi __attribute__ ((unused));
1470                 zsi = NR_FREE_PAGES;
1471         ],[
1472                 AC_MSG_RESULT(yes)
1473                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES, 1,
1474                           [Page state NR_FREE_PAGES is available])
1475         ],[
1476                 AC_MSG_RESULT(no)
1477         ])
1478 ])
1479
1480 dnl #
1481 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1482 dnl # Public global zone stats now include an inactive page count.  However
1483 dnl # the enumerated names of the counters have changed since this API
1484 dnl # was introduced.  We need to deduce the corrent name to use.  This
1485 dnl # replaces the priviate get_zone_counts() interface.
1486 dnl #
1487 dnl # NR_INACTIVE was available from 2.6.21 to 2.6.27 and included both
1488 dnl # anonymous and file inactive pages.  As of 2.6.28 it was split in
1489 dnl # to NR_INACTIVE_ANON and NR_INACTIVE_FILE.
1490 dnl #
1491 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_INACTIVE], [
1492         AC_MSG_CHECKING([whether page state NR_INACTIVE is available])
1493         SPL_LINUX_TRY_COMPILE([
1494                 #include <linux/mm.h>
1495         ],[
1496                 enum zone_stat_item zsi __attribute__ ((unused));
1497                 zsi = NR_INACTIVE;
1498         ],[
1499                 AC_MSG_RESULT(yes)
1500                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE, 1,
1501                           [Page state NR_INACTIVE is available])
1502         ],[
1503                 AC_MSG_RESULT(no)
1504         ])
1505
1506         AC_MSG_CHECKING([whether page state NR_INACTIVE_ANON is available])
1507         SPL_LINUX_TRY_COMPILE([
1508                 #include <linux/mm.h>
1509         ],[
1510                 enum zone_stat_item zsi __attribute__ ((unused));
1511                 zsi = NR_INACTIVE_ANON;
1512         ],[
1513                 AC_MSG_RESULT(yes)
1514                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON, 1,
1515                           [Page state NR_INACTIVE_ANON is available])
1516         ],[
1517                 AC_MSG_RESULT(no)
1518         ])
1519
1520         AC_MSG_CHECKING([whether page state NR_INACTIVE_FILE is available])
1521         SPL_LINUX_TRY_COMPILE([
1522                 #include <linux/mm.h>
1523         ],[
1524                 enum zone_stat_item zsi __attribute__ ((unused));
1525                 zsi = NR_INACTIVE_FILE;
1526         ],[
1527                 AC_MSG_RESULT(yes)
1528                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE, 1,
1529                           [Page state NR_INACTIVE_FILE is available])
1530         ],[
1531                 AC_MSG_RESULT(no)
1532         ])
1533 ])
1534
1535 dnl #
1536 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1537 dnl # Public global zone stats now include an active page count.  However
1538 dnl # the enumerated names of the counters have changed since this API
1539 dnl # was introduced.  We need to deduce the corrent name to use.  This
1540 dnl # replaces the priviate get_zone_counts() interface.
1541 dnl #
1542 dnl # NR_ACTIVE was available from 2.6.21 to 2.6.27 and included both
1543 dnl # anonymous and file active pages.  As of 2.6.28 it was split in
1544 dnl # to NR_ACTIVE_ANON and NR_ACTIVE_FILE.
1545 dnl #
1546 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_ACTIVE], [
1547         AC_MSG_CHECKING([whether page state NR_ACTIVE is available])
1548         SPL_LINUX_TRY_COMPILE([
1549                 #include <linux/mm.h>
1550         ],[
1551                 enum zone_stat_item zsi __attribute__ ((unused));
1552                 zsi = NR_ACTIVE;
1553         ],[
1554                 AC_MSG_RESULT(yes)
1555                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE, 1,
1556                           [Page state NR_ACTIVE is available])
1557         ],[
1558                 AC_MSG_RESULT(no)
1559         ])
1560
1561         AC_MSG_CHECKING([whether page state NR_ACTIVE_ANON is available])
1562         SPL_LINUX_TRY_COMPILE([
1563                 #include <linux/mm.h>
1564         ],[
1565                 enum zone_stat_item zsi __attribute__ ((unused));
1566                 zsi = NR_ACTIVE_ANON;
1567         ],[
1568                 AC_MSG_RESULT(yes)
1569                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON, 1,
1570                           [Page state NR_ACTIVE_ANON is available])
1571         ],[
1572                 AC_MSG_RESULT(no)
1573         ])
1574
1575         AC_MSG_CHECKING([whether page state NR_ACTIVE_FILE is available])
1576         SPL_LINUX_TRY_COMPILE([
1577                 #include <linux/mm.h>
1578         ],[
1579                 enum zone_stat_item zsi __attribute__ ((unused));
1580                 zsi = NR_ACTIVE_FILE;
1581         ],[
1582                 AC_MSG_RESULT(yes)
1583                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE, 1,
1584                           [Page state NR_ACTIVE_FILE is available])
1585         ],[
1586                 AC_MSG_RESULT(no)
1587         ])
1588 ])
1589
1590 dnl #
1591 dnl # Proposed API change for legacy kernels.
1592 dnl # This symbol is not available in older kernels.  For kernels post
1593 dnl # 2.6.21 the global_page_state() API is used to get free/inactive/active
1594 dnl # page state information.  This symbol is only used in legacy kernels
1595 dnl # any only as a last resort.
1596 dnl
1597 AC_DEFUN([SPL_AC_GET_ZONE_COUNTS], [
1598         AC_MSG_CHECKING([whether symbol get_zone_counts is needed])
1599         SPL_LINUX_TRY_COMPILE([
1600         ],[
1601                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES)
1602                 #error "global_page_state needs NR_FREE_PAGES"
1603                 #endif
1604
1605                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE) && \
1606                     !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON) && \
1607                     !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE)
1608                 #error "global_page_state needs NR_ACTIVE*"
1609                 #endif
1610
1611                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE) && \
1612                     !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON) && \
1613                     !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE)
1614                 #error "global_page_state needs NR_INACTIVE*"
1615                 #endif
1616         ],[
1617                 AC_MSG_RESULT(no)
1618         ],[
1619                 AC_MSG_RESULT(yes)
1620                 AC_DEFINE(NEED_GET_ZONE_COUNTS, 1,
1621                           [get_zone_counts() is needed])
1622
1623                 AC_MSG_CHECKING([whether get_zone_counts() is available])
1624                 SPL_LINUX_TRY_COMPILE_SYMBOL([
1625                         #include <linux/mmzone.h>
1626                 ], [
1627                         get_zone_counts(NULL, NULL, NULL);
1628                 ], [get_zone_counts], [], [
1629                         AC_MSG_RESULT(yes)
1630                         AC_DEFINE(HAVE_GET_ZONE_COUNTS, 1,
1631                                   [get_zone_counts() is available])
1632                 ], [
1633                         AC_MSG_RESULT(no)
1634                 ])
1635         ])
1636 ])
1637
1638 dnl #
1639 dnl # 2.6.27 API change,
1640 dnl # The user_path_dir() replaces __user_walk()
1641 dnl #
1642 AC_DEFUN([SPL_AC_USER_PATH_DIR],
1643         [AC_MSG_CHECKING([whether user_path_dir() is available])
1644         SPL_LINUX_TRY_COMPILE_SYMBOL([
1645                 #include <linux/fcntl.h>
1646                 #include <linux/namei.h>
1647         ], [
1648                 user_path_dir(NULL, NULL);
1649         ], [user_path_at], [], [
1650                 AC_MSG_RESULT(yes)
1651                 AC_DEFINE(HAVE_USER_PATH_DIR, 1, [user_path_dir() is available])
1652         ], [
1653                 AC_MSG_RESULT(no)
1654         ])
1655 ])
1656
1657 dnl #
1658 dnl # Symbol available in RHEL kernels not in stock kernels.
1659 dnl #
1660 AC_DEFUN([SPL_AC_SET_FS_PWD],
1661         [AC_MSG_CHECKING([whether set_fs_pwd() is available])
1662         SPL_LINUX_TRY_COMPILE_SYMBOL([
1663                 #include <linux/spinlock.h>
1664                 #include <linux/fs_struct.h>
1665         ], [
1666                 (void) set_fs_pwd;
1667         ], [set_fs_pwd], [], [
1668                 AC_MSG_RESULT(yes)
1669                 AC_DEFINE(HAVE_SET_FS_PWD, 1, [set_fs_pwd() is available])
1670         ], [
1671                 AC_MSG_RESULT(no)
1672         ])
1673 ])
1674
1675 dnl #
1676 dnl # 2.6.25 API change,
1677 dnl # Simplied API by replacing mnt+dentry args with a single path arg.
1678 dnl #
1679 AC_DEFUN([SPL_AC_2ARGS_SET_FS_PWD],
1680         [AC_MSG_CHECKING([whether set_fs_pwd() wants 2 args])
1681         SPL_LINUX_TRY_COMPILE([
1682                 #include <linux/sched.h>
1683                 #include <linux/fs_struct.h>
1684         ],[
1685                 set_fs_pwd(NULL, NULL);
1686         ],[
1687                 AC_MSG_RESULT(yes)
1688                 AC_DEFINE(HAVE_2ARGS_SET_FS_PWD, 1,
1689                           [set_fs_pwd() wants 2 args])
1690                 HAVE_2ARGS_SET_FS_PWD=yes
1691         ],[
1692                 AC_MSG_RESULT(no)
1693         ])
1694 ])
1695
1696 dnl #
1697 dnl # 3.9 API change
1698 dnl # set_fs_pwd takes const struct path *
1699 dnl #
1700 AC_DEFUN([SPL_AC_SET_FS_PWD_WITH_CONST],
1701 if test "x$HAVE_2ARGS_SET_FS_PWD" = xyes; then
1702         tmp_flags="$EXTRA_KCFLAGS"
1703         EXTRA_KCFLAGS="-Werror"
1704         [AC_MSG_CHECKING([whether set_fs_pwd() requires const struct path *])
1705         SPL_LINUX_TRY_COMPILE([
1706                 #include <linux/spinlock.h>
1707                 #include <linux/fs_struct.h>
1708                 #include <linux/path.h>
1709                 void (*const set_fs_pwd_func)
1710                         (struct fs_struct *, const struct path *)
1711                         = set_fs_pwd;
1712         ],[
1713                 return 0;
1714         ],[
1715                 AC_MSG_RESULT(yes)
1716                 AC_DEFINE(HAVE_SET_FS_PWD_WITH_CONST, 1,
1717                         [set_fs_pwd() needs const path *])
1718         ],[
1719                 SPL_LINUX_TRY_COMPILE([
1720                         #include <linux/spinlock.h>
1721                         #include <linux/fs_struct.h>
1722                         #include <linux/path.h>
1723                         void (*const set_fs_pwd_func)
1724                                 (struct fs_struct *, struct path *)
1725                                 = set_fs_pwd;
1726                 ],[
1727                         return 0;
1728                 ],[
1729                         AC_MSG_RESULT(no)
1730                 ],[
1731                         AC_MSG_ERROR(unknown)
1732                 ])
1733         ])
1734         EXTRA_KCFLAGS="$tmp_flags"
1735 fi
1736 ])
1737
1738 dnl #
1739 dnl # SLES API change, never adopted in mainline,
1740 dnl # Third 'struct vfsmount *' argument removed.
1741 dnl #
1742 AC_DEFUN([SPL_AC_2ARGS_VFS_UNLINK],
1743         [AC_MSG_CHECKING([whether vfs_unlink() wants 2 args])
1744         SPL_LINUX_TRY_COMPILE([
1745                 #include <linux/fs.h>
1746         ],[
1747                 vfs_unlink(NULL, NULL);
1748         ],[
1749                 AC_MSG_RESULT(yes)
1750                 AC_DEFINE(HAVE_2ARGS_VFS_UNLINK, 1,
1751                           [vfs_unlink() wants 2 args])
1752         ],[
1753                 AC_MSG_RESULT(no)
1754         ])
1755 ])
1756
1757 dnl #
1758 dnl # SLES API change, never adopted in mainline,
1759 dnl # Third and sixth 'struct vfsmount *' argument removed.
1760 dnl #
1761 AC_DEFUN([SPL_AC_4ARGS_VFS_RENAME],
1762         [AC_MSG_CHECKING([whether vfs_rename() wants 4 args])
1763         SPL_LINUX_TRY_COMPILE([
1764                 #include <linux/fs.h>
1765         ],[
1766                 vfs_rename(NULL, NULL, NULL, NULL);
1767         ],[
1768                 AC_MSG_RESULT(yes)
1769                 AC_DEFINE(HAVE_4ARGS_VFS_RENAME, 1,
1770                           [vfs_rename() wants 4 args])
1771         ],[
1772                 AC_MSG_RESULT(no)
1773         ])
1774 ])
1775
1776 dnl #
1777 dnl # 2.6.36 API change,
1778 dnl # The 'struct fs_struct->lock' was changed from a rwlock_t to
1779 dnl # a spinlock_t to improve the fastpath performance.
1780 dnl #
1781 AC_DEFUN([SPL_AC_FS_STRUCT_SPINLOCK], [
1782         AC_MSG_CHECKING([whether struct fs_struct uses spinlock_t])
1783         tmp_flags="$EXTRA_KCFLAGS"
1784         EXTRA_KCFLAGS="-Werror"
1785         SPL_LINUX_TRY_COMPILE([
1786                 #include <linux/sched.h>
1787                 #include <linux/fs_struct.h>
1788         ],[
1789                 struct fs_struct fs;
1790                 spin_lock_init(&fs.lock);
1791         ],[
1792                 AC_MSG_RESULT(yes)
1793                 AC_DEFINE(HAVE_FS_STRUCT_SPINLOCK, 1,
1794                           [struct fs_struct uses spinlock_t])
1795         ],[
1796                 AC_MSG_RESULT(no)
1797         ])
1798         EXTRA_KCFLAGS="$tmp_flags"
1799 ])
1800
1801 dnl #
1802 dnl # 2.6.29 API change,
1803 dnl # check whether 'struct cred' exists
1804 dnl #
1805 AC_DEFUN([SPL_AC_CRED_STRUCT], [
1806         AC_MSG_CHECKING([whether struct cred exists])
1807         SPL_LINUX_TRY_COMPILE([
1808                 #include <linux/cred.h>
1809         ],[
1810                 struct cred *cr __attribute__ ((unused));
1811                 cr  = NULL;
1812         ],[
1813                 AC_MSG_RESULT(yes)
1814                 AC_DEFINE(HAVE_CRED_STRUCT, 1, [struct cred exists])
1815         ],[
1816                 AC_MSG_RESULT(no)
1817         ])
1818 ])
1819
1820 dnl #
1821 dnl # Custom SPL patch may export this symbol.
1822 dnl #
1823 AC_DEFUN([SPL_AC_GROUPS_SEARCH],
1824         [AC_MSG_CHECKING([whether groups_search() is available])
1825         SPL_LINUX_TRY_COMPILE_SYMBOL([
1826                 #include <linux/cred.h>
1827         ], [
1828                 groups_search(NULL, 0);
1829         ], [groups_search], [], [
1830                 AC_MSG_RESULT(yes)
1831                 AC_DEFINE(HAVE_GROUPS_SEARCH, 1, [groups_search() is available])
1832         ], [
1833                 AC_MSG_RESULT(no)
1834         ])
1835 ])
1836
1837 dnl #
1838 dnl # 2.6.x API change,
1839 dnl # __put_task_struct() was exported in RHEL5 but unavailable elsewhere.
1840 dnl #
1841 AC_DEFUN([SPL_AC_PUT_TASK_STRUCT],
1842         [AC_MSG_CHECKING([whether __put_task_struct() is available])
1843         SPL_LINUX_TRY_COMPILE_SYMBOL([
1844                 #include <linux/sched.h>
1845         ], [
1846                 __put_task_struct(NULL);
1847         ], [__put_task_struct], [], [
1848                 AC_MSG_RESULT(yes)
1849                 AC_DEFINE(HAVE_PUT_TASK_STRUCT, 1,
1850                           [__put_task_struct() is available])
1851         ], [
1852                 AC_MSG_RESULT(no)
1853         ])
1854 ])
1855
1856 dnl #
1857 dnl # 2.6.32 API change,
1858 dnl # Unused 'struct file *' removed from prototype.
1859 dnl #
1860 AC_DEFUN([SPL_AC_5ARGS_PROC_HANDLER], [
1861         AC_MSG_CHECKING([whether proc_handler() wants 5 args])
1862         SPL_LINUX_TRY_COMPILE([
1863                 #include <linux/sysctl.h>
1864         ],[
1865                 proc_dostring(NULL, 0, NULL, NULL, NULL);
1866         ],[
1867                 AC_MSG_RESULT(yes)
1868                 AC_DEFINE(HAVE_5ARGS_PROC_HANDLER, 1,
1869                           [proc_handler() wants 5 args])
1870         ],[
1871                 AC_MSG_RESULT(no)
1872         ])
1873 ])
1874
1875 dnl #
1876 dnl # 2.6.x API change,
1877 dnl # kvasprintf() function added.
1878 dnl #
1879 AC_DEFUN([SPL_AC_KVASPRINTF],
1880         [AC_MSG_CHECKING([whether kvasprintf() is available])
1881         SPL_LINUX_TRY_COMPILE_SYMBOL([
1882                 #include <linux/kernel.h>
1883         ], [
1884                 kvasprintf(0, NULL, *((va_list*)NULL));
1885         ], [kvasprintf], [], [
1886                 AC_MSG_RESULT(yes)
1887                 AC_DEFINE(HAVE_KVASPRINTF, 1, [kvasprintf() is available])
1888         ], [
1889                 AC_MSG_RESULT(no)
1890         ])
1891 ])
1892
1893 dnl #
1894 dnl # 2.6.29 API change,
1895 dnl # vfs_fsync() funcation added, prior to this use file_fsync().
1896 dnl #
1897 AC_DEFUN([SPL_AC_VFS_FSYNC],
1898         [AC_MSG_CHECKING([whether vfs_fsync() is available])
1899         SPL_LINUX_TRY_COMPILE_SYMBOL([
1900                 #include <linux/fs.h>
1901         ], [
1902                 (void) vfs_fsync;
1903         ], [vfs_fsync], [fs/sync.c], [
1904                 AC_MSG_RESULT(yes)
1905                 AC_DEFINE(HAVE_VFS_FSYNC, 1, [vfs_fsync() is available])
1906         ], [
1907                 AC_MSG_RESULT(no)
1908         ])
1909 ])
1910
1911 dnl #
1912 dnl # 2.6.35 API change,
1913 dnl # Unused 'struct dentry *' removed from vfs_fsync() prototype.
1914 dnl #
1915 AC_DEFUN([SPL_AC_2ARGS_VFS_FSYNC], [
1916         AC_MSG_CHECKING([whether vfs_fsync() wants 2 args])
1917         SPL_LINUX_TRY_COMPILE([
1918                 #include <linux/fs.h>
1919         ],[
1920                 vfs_fsync(NULL, 0);
1921         ],[
1922                 AC_MSG_RESULT(yes)
1923                 AC_DEFINE(HAVE_2ARGS_VFS_FSYNC, 1, [vfs_fsync() wants 2 args])
1924         ],[
1925                 AC_MSG_RESULT(no)
1926         ])
1927 ])
1928
1929 dnl #
1930 dnl # 3.5 API change,
1931 dnl # inode_operations.truncate_range removed
1932 dnl #
1933 AC_DEFUN([SPL_AC_INODE_TRUNCATE_RANGE], [
1934         AC_MSG_CHECKING([whether truncate_range() inode operation is available])
1935         SPL_LINUX_TRY_COMPILE([
1936                 #include <linux/fs.h>
1937         ],[
1938                 struct inode_operations ops;
1939                 ops.truncate_range = NULL;
1940         ],[
1941                 AC_MSG_RESULT(yes)
1942                 AC_DEFINE(HAVE_INODE_TRUNCATE_RANGE, 1,
1943                         [truncate_range() inode operation is available])
1944         ],[
1945                 AC_MSG_RESULT(no)
1946         ])
1947 ])
1948
1949 dnl #
1950 dnl # Linux 2.6.38 - 3.x API
1951 dnl #
1952 AC_DEFUN([SPL_AC_KERNEL_FILE_FALLOCATE], [
1953         AC_MSG_CHECKING([whether fops->fallocate() exists])
1954         SPL_LINUX_TRY_COMPILE([
1955                 #include <linux/fs.h>
1956         ],[
1957                 long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL;
1958                 struct file_operations fops __attribute__ ((unused)) = {
1959                         .fallocate = fallocate,
1960                 };
1961         ],[
1962                 AC_MSG_RESULT(yes)
1963                 AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists])
1964         ],[
1965                 AC_MSG_RESULT(no)
1966         ])
1967 ])
1968
1969 dnl #
1970 dnl # Linux 2.6.x - 2.6.37 API
1971 dnl #
1972 AC_DEFUN([SPL_AC_KERNEL_INODE_FALLOCATE], [
1973         AC_MSG_CHECKING([whether iops->fallocate() exists])
1974         SPL_LINUX_TRY_COMPILE([
1975                 #include <linux/fs.h>
1976         ],[
1977                 long (*fallocate) (struct inode *, int, loff_t, loff_t) = NULL;
1978                 struct inode_operations fops __attribute__ ((unused)) = {
1979                         .fallocate = fallocate,
1980                 };
1981         ],[
1982                 AC_MSG_RESULT(yes)
1983                 AC_DEFINE(HAVE_INODE_FALLOCATE, 1, [fops->fallocate() exists])
1984         ],[
1985                 AC_MSG_RESULT(no)
1986         ])
1987 ])
1988
1989 dnl #
1990 dnl # PaX Linux 2.6.38 - 3.x API
1991 dnl #
1992 AC_DEFUN([SPL_AC_PAX_KERNEL_FILE_FALLOCATE], [
1993         AC_MSG_CHECKING([whether fops->fallocate() exists])
1994         SPL_LINUX_TRY_COMPILE([
1995                 #include <linux/fs.h>
1996         ],[
1997                 long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL;
1998                 struct file_operations_no_const fops __attribute__ ((unused)) = {
1999                         .fallocate = fallocate,
2000                 };
2001         ],[
2002                 AC_MSG_RESULT(yes)
2003                 AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists])
2004         ],[
2005                 AC_MSG_RESULT(no)
2006         ])
2007 ])
2008
2009 dnl #
2010 dnl # The fallocate callback was moved from the inode_operations
2011 dnl # structure to the file_operations structure.
2012 dnl #
2013 AC_DEFUN([SPL_AC_KERNEL_FALLOCATE], [
2014         SPL_AC_KERNEL_FILE_FALLOCATE
2015         SPL_AC_KERNEL_INODE_FALLOCATE
2016         SPL_AC_PAX_KERNEL_FILE_FALLOCATE
2017 ])
2018
2019 dnl #
2020 dnl # 2.6.33 API change. Also backported in RHEL5 as of 2.6.18-190.el5.
2021 dnl # Earlier versions of rwsem_is_locked() were inline and had a race
2022 dnl # condition.  The fixed version is exported as a symbol.  The race
2023 dnl # condition is fixed by acquiring sem->wait_lock, so we must not
2024 dnl # call that version while holding sem->wait_lock.
2025 dnl #
2026 AC_DEFUN([SPL_AC_EXPORTED_RWSEM_IS_LOCKED],
2027         [AC_MSG_CHECKING([whether rwsem_is_locked() acquires sem->wait_lock])
2028         SPL_LINUX_TRY_COMPILE_SYMBOL([
2029                 #include <linux/rwsem.h>
2030                 int rwsem_is_locked(struct rw_semaphore *sem) { return 0; }
2031         ], [], [rwsem_is_locked], [lib/rwsem-spinlock.c], [
2032                 AC_MSG_RESULT(yes)
2033                 AC_DEFINE(RWSEM_IS_LOCKED_TAKES_WAIT_LOCK, 1,
2034                           [rwsem_is_locked() acquires sem->wait_lock])
2035         ], [
2036                 AC_MSG_RESULT(no)
2037         ])
2038 ])
2039
2040 dnl #
2041 dnl # 2.6.xx API compat,
2042 dnl # There currently exists no exposed API to partially shrink the dcache.
2043 dnl # The expected mechanism to shrink the cache is a registered shrinker
2044 dnl # which is called during memory pressure.
2045 dnl #
2046 AC_DEFUN([SPL_AC_SHRINK_DCACHE_MEMORY],
2047         [AC_MSG_CHECKING([whether shrink_dcache_memory() is available])
2048         SPL_LINUX_TRY_COMPILE_SYMBOL([
2049                 #include <linux/dcache.h>
2050         ], [
2051                 shrink_dcache_memory(0, 0);
2052         ], [shrink_dcache_memory], [fs/dcache.c], [
2053                 AC_MSG_RESULT(yes)
2054                 AC_DEFINE(HAVE_SHRINK_DCACHE_MEMORY, 1,
2055                           [shrink_dcache_memory() is available])
2056         ], [
2057                 AC_MSG_RESULT(no)
2058         ])
2059 ])
2060
2061 dnl #
2062 dnl # 2.6.xx API compat,
2063 dnl # There currently exists no exposed API to partially shrink the icache.
2064 dnl # The expected mechanism to shrink the cache is a registered shrinker
2065 dnl # which is called during memory pressure.
2066 dnl #
2067 AC_DEFUN([SPL_AC_SHRINK_ICACHE_MEMORY],
2068         [AC_MSG_CHECKING([whether shrink_icache_memory() is available])
2069         SPL_LINUX_TRY_COMPILE_SYMBOL([
2070                 #include <linux/dcache.h>
2071         ], [
2072                 shrink_icache_memory(0, 0);
2073         ], [shrink_icache_memory], [fs/inode.c], [
2074                 AC_MSG_RESULT(yes)
2075                 AC_DEFINE(HAVE_SHRINK_ICACHE_MEMORY, 1,
2076                           [shrink_icache_memory() is available])
2077         ], [
2078                 AC_MSG_RESULT(no)
2079         ])
2080 ])
2081
2082 dnl #
2083 dnl # 2.6.39 API compat,
2084 dnl # The path_lookup() function has been renamed to kern_path_parent()
2085 dnl # and the flags argument has been removed.  The only behavior now
2086 dnl # offered is that of LOOKUP_PARENT.  The spl already always passed
2087 dnl # this flag so dropping the flag does not impact us.
2088 dnl #
2089 AC_DEFUN([SPL_AC_KERN_PATH_PARENT_HEADER], [
2090         SPL_CHECK_SYMBOL_HEADER(
2091                 [kern_path_parent],
2092                 [int kern_path_parent(const char \*, struct nameidata \*)],
2093                 [include/linux/namei.h],
2094                 [AC_DEFINE(HAVE_KERN_PATH_PARENT_HEADER, 1,
2095                 [kern_path_parent() is available])],
2096                 [])
2097 ])
2098
2099 dnl #
2100 dnl # 3.1 API compat,
2101 dnl # The kern_path_parent() symbol is no longer exported by the kernel.
2102 dnl # However, it remains the prefered interface and since we still have
2103 dnl # access to the prototype we dynamically lookup the required address.
2104 dnl #
2105 AC_DEFUN([SPL_AC_KERN_PATH_PARENT_SYMBOL],
2106         [AC_MSG_CHECKING([whether kern_path_parent() is available])
2107         SPL_LINUX_TRY_COMPILE_SYMBOL([
2108                 #include <linux/namei.h>
2109         ], [
2110                 kern_path_parent(NULL, NULL);
2111         ], [kern_path_parent], [fs/namei.c], [
2112                 AC_MSG_RESULT(yes)
2113                 AC_DEFINE(HAVE_KERN_PATH_PARENT_SYMBOL, 1,
2114                           [kern_path_parent() is available])
2115         ], [
2116                 AC_MSG_RESULT(no)
2117         ])
2118 ])
2119
2120 dnl #
2121 dnl # 3.6 API compat,
2122 dnl # The kern_path_parent() function was replaced by the kern_path_locked()
2123 dnl # function to eliminate all struct nameidata usage outside fs/namei.c.
2124 dnl #
2125 AC_DEFUN([SPL_AC_KERN_PATH_LOCKED], [
2126         SPL_CHECK_SYMBOL_HEADER(
2127                 [kern_path_locked],
2128                 [struct dentry \*kern_path_locked(const char \*, struct path \*)],
2129                 [include/linux/namei.h],
2130                 [AC_DEFINE(HAVE_KERN_PATH_LOCKED, 1,
2131                 [kern_path_locked() is available])],
2132                 [])
2133 ])
2134
2135 dnl #
2136 dnl # /proc/kallsyms support,
2137 dnl # Verify the kernel has CONFIG_KALLSYMS support enabled.
2138 dnl #
2139 AC_DEFUN([SPL_AC_CONFIG_KALLSYMS], [
2140         AC_MSG_CHECKING([whether CONFIG_KALLSYMS is defined])
2141         SPL_LINUX_TRY_COMPILE([
2142                 #if !defined(CONFIG_KALLSYMS)
2143                 #error CONFIG_KALLSYMS not defined
2144                 #endif
2145         ],[ ],[
2146                 AC_MSG_RESULT([yes])
2147         ],[
2148                 AC_MSG_RESULT([no])
2149                 AC_MSG_ERROR([
2150         *** This kernel does not include the required kallsyms support.
2151         *** Rebuild the kernel with CONFIG_KALLSYMS=y set.])
2152         ])
2153 ])
2154
2155 dnl #
2156 dnl # zlib inflate compat,
2157 dnl # Verify the kernel has CONFIG_ZLIB_INFLATE support enabled.
2158 dnl #
2159 AC_DEFUN([SPL_AC_CONFIG_ZLIB_INFLATE], [
2160         AC_MSG_CHECKING([whether CONFIG_ZLIB_INFLATE is defined])
2161         SPL_LINUX_TRY_COMPILE([
2162                 #if !defined(CONFIG_ZLIB_INFLATE) && \
2163                     !defined(CONFIG_ZLIB_INFLATE_MODULE)
2164                 #error CONFIG_ZLIB_INFLATE not defined
2165                 #endif
2166         ],[ ],[
2167                 AC_MSG_RESULT([yes])
2168         ],[
2169                 AC_MSG_RESULT([no])
2170                 AC_MSG_ERROR([
2171         *** This kernel does not include the required zlib inflate support.
2172         *** Rebuild the kernel with CONFIG_ZLIB_INFLATE=y|m set.])
2173         ])
2174 ])
2175
2176 dnl #
2177 dnl # zlib deflate compat,
2178 dnl # Verify the kernel has CONFIG_ZLIB_DEFLATE support enabled.
2179 dnl #
2180 AC_DEFUN([SPL_AC_CONFIG_ZLIB_DEFLATE], [
2181         AC_MSG_CHECKING([whether CONFIG_ZLIB_DEFLATE is defined])
2182         SPL_LINUX_TRY_COMPILE([
2183                 #if !defined(CONFIG_ZLIB_DEFLATE) && \
2184                     !defined(CONFIG_ZLIB_DEFLATE_MODULE)
2185                 #error CONFIG_ZLIB_DEFLATE not defined
2186                 #endif
2187         ],[ ],[
2188                 AC_MSG_RESULT([yes])
2189         ],[
2190                 AC_MSG_RESULT([no])
2191                 AC_MSG_ERROR([
2192         *** This kernel does not include the required zlib deflate support.
2193         *** Rebuild the kernel with CONFIG_ZLIB_DEFLATE=y|m set.])
2194         ])
2195 ])
2196
2197 dnl #
2198 dnl # 2.6.39 API compat,
2199 dnl # The function zlib_deflate_workspacesize() now take 2 arguments.
2200 dnl # This was done to avoid always having to allocate the maximum size
2201 dnl # workspace (268K).  The caller can now specific the windowBits and
2202 dnl # memLevel compression parameters to get a smaller workspace.
2203 dnl #
2204 AC_DEFUN([SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE],
2205         [AC_MSG_CHECKING([whether zlib_deflate_workspacesize() wants 2 args])
2206         SPL_LINUX_TRY_COMPILE([
2207                 #include <linux/zlib.h>
2208         ],[
2209                 return zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL);
2210         ],[
2211                 AC_MSG_RESULT(yes)
2212                 AC_DEFINE(HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE, 1,
2213                           [zlib_deflate_workspacesize() wants 2 args])
2214         ],[
2215                 AC_MSG_RESULT(no)
2216         ])
2217 ])
2218
2219 dnl #
2220 dnl # 2.6.39 API change,
2221 dnl # Shrinker adjust to use common shrink_control structure.
2222 dnl #
2223 AC_DEFUN([SPL_AC_SHRINK_CONTROL_STRUCT], [
2224         AC_MSG_CHECKING([whether struct shrink_control exists])
2225         SPL_LINUX_TRY_COMPILE([
2226                 #include <linux/mm.h>
2227         ],[
2228                 struct shrink_control sc __attribute__ ((unused));
2229
2230                 sc.nr_to_scan = 0;
2231                 sc.gfp_mask = GFP_KERNEL;
2232         ],[
2233                 AC_MSG_RESULT(yes)
2234                 AC_DEFINE(HAVE_SHRINK_CONTROL_STRUCT, 1,
2235                         [struct shrink_control exists])
2236         ],[
2237                 AC_MSG_RESULT(no)
2238         ])
2239 ])
2240
2241 dnl #
2242 dnl # 3.1 API Change
2243 dnl #
2244 dnl # The rw_semaphore.wait_lock member was changed from spinlock_t to
2245 dnl # raw_spinlock_t at commit ddb6c9b58a19edcfac93ac670b066c836ff729f1.
2246 dnl #
2247 AC_DEFUN([SPL_AC_RWSEM_SPINLOCK_IS_RAW], [
2248         AC_MSG_CHECKING([whether struct rw_semaphore member wait_lock is raw])
2249         tmp_flags="$EXTRA_KCFLAGS"
2250         EXTRA_KCFLAGS="-Werror"
2251         SPL_LINUX_TRY_COMPILE([
2252                 #include <linux/rwsem.h>
2253         ],[
2254                 struct rw_semaphore dummy_semaphore __attribute__ ((unused));
2255                 raw_spinlock_t dummy_lock __attribute__ ((unused));
2256                 dummy_semaphore.wait_lock = dummy_lock;
2257         ],[
2258                 AC_MSG_RESULT(yes)
2259                 AC_DEFINE(RWSEM_SPINLOCK_IS_RAW, 1,
2260                 [struct rw_semaphore member wait_lock is raw_spinlock_t])
2261         ],[
2262                 AC_MSG_RESULT(no)
2263         ])
2264         EXTRA_KCFLAGS="$tmp_flags"
2265 ])
2266
2267 dnl #
2268 dnl # 3.9 API change,
2269 dnl # Moved things from linux/sched.h to linux/sched/rt.h
2270 dnl #
2271 AC_DEFUN([SPL_AC_SCHED_RT_HEADER],
2272         [AC_MSG_CHECKING([whether header linux/sched/rt.h exists])
2273         SPL_LINUX_TRY_COMPILE([
2274                 #include <linux/sched.h>
2275                 #include <linux/sched/rt.h>
2276         ],[
2277                 return 0;
2278         ],[
2279                 AC_DEFINE(HAVE_SCHED_RT_HEADER, 1, [linux/sched/rt.h exists])
2280                 AC_MSG_RESULT(yes)
2281         ],[
2282                 AC_MSG_RESULT(no)
2283         ])
2284 ])
2285
2286 dnl #
2287 dnl # 3.9 API change,
2288 dnl # vfs_getattr() uses 2 args
2289 dnl # It takes struct path * instead of struct vfsmount * and struct dentry *
2290 dnl #
2291 AC_DEFUN([SPL_AC_2ARGS_VFS_GETATTR], [
2292         AC_MSG_CHECKING([whether vfs_getattr() wants])
2293         SPL_LINUX_TRY_COMPILE([
2294                 #include <linux/fs.h>
2295         ],[
2296                 vfs_getattr((struct path *) NULL,
2297                         (struct kstat *)NULL);
2298         ],[
2299                 AC_MSG_RESULT(2 args)
2300                 AC_DEFINE(HAVE_2ARGS_VFS_GETATTR, 1,
2301                           [vfs_getattr wants 2 args])
2302         ],[
2303                 SPL_LINUX_TRY_COMPILE([
2304                         #include <linux/fs.h>
2305                 ],[
2306                         vfs_getattr((struct vfsmount *)NULL,
2307                                 (struct dentry *)NULL,
2308                                 (struct kstat *)NULL);
2309                 ],[
2310                         AC_MSG_RESULT(3 args)
2311                 ],[
2312                         AC_MSG_ERROR(unknown)
2313                 ])
2314         ])
2315 ])