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_SET_FS_PWD_WITH_CONST
  67         SPL_AC_2ARGS_VFS_UNLINK
  68         SPL_AC_4ARGS_VFS_RENAME
  69         SPL_AC_VFS_FSYNC
  70         SPL_AC_2ARGS_VFS_FSYNC
  71         SPL_AC_INODE_TRUNCATE_RANGE
  72         SPL_AC_FS_STRUCT_SPINLOCK
  73         SPL_AC_CRED_STRUCT
  74         SPL_AC_GROUPS_SEARCH
  75         SPL_AC_PUT_TASK_STRUCT
  76         SPL_AC_5ARGS_PROC_HANDLER
  77         SPL_AC_KVASPRINTF
  78         SPL_AC_EXPORTED_RWSEM_IS_LOCKED
  79         SPL_AC_KERNEL_FALLOCATE
  80         SPL_AC_SHRINK_DCACHE_MEMORY
  81         SPL_AC_SHRINK_ICACHE_MEMORY
  82         SPL_AC_KERN_PATH_PARENT_HEADER
  83         SPL_AC_KERN_PATH_PARENT_SYMBOL
  84         SPL_AC_KERN_PATH_LOCKED
  85         SPL_AC_CONFIG_KALLSYMS
  86         SPL_AC_CONFIG_ZLIB_INFLATE
  87         SPL_AC_CONFIG_ZLIB_DEFLATE
  88         SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
  89         SPL_AC_SHRINK_CONTROL_STRUCT
  90         SPL_AC_RWSEM_SPINLOCK_IS_RAW
  91         SPL_AC_SCHED_RT_HEADER
  92         SPL_AC_2ARGS_VFS_GETATTR
  93 ])
  94
  95 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
  96         modpost=$LINUX/scripts/Makefile.modpost
  97         AC_MSG_CHECKING([kernel file name for module symbols])
  98         if test "x$enable_linux_builtin" != xyes -a -f "$modpost"; then
  99                 if grep -q Modules.symvers $modpost; then
 100                         LINUX_SYMBOLS=Modules.symvers
 101                 else
 102                         LINUX_SYMBOLS=Module.symvers
 103                 fi
 104
 105                 if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
 106                         AC_MSG_ERROR([
 107         *** Please make sure the kernel devel package for your distribution
 108         *** is installed.  If your building with a custom kernel make sure the
 109         *** kernel is configured, built, and the '--with-linux=PATH' configure
 110         *** option refers to the location of the kernel source.])
 111                 fi
 112         else
 113                 LINUX_SYMBOLS=NONE
 114         fi
 115         AC_MSG_RESULT($LINUX_SYMBOLS)
 116         AC_SUBST(LINUX_SYMBOLS)
 117 ])
 118
 119 AC_DEFUN([SPL_AC_KERNEL], [
 120         AC_ARG_WITH([linux],
 121                 AS_HELP_STRING([--with-linux=PATH],
 122                 [Path to kernel source]),
 123                 [kernelsrc="$withval"])
 124
 125         AC_ARG_WITH([linux-obj],
 126                 AS_HELP_STRING([--with-linux-obj=PATH],
 127                 [Path to kernel build objects]),
 128                 [kernelbuild="$withval"])
 129
 130         AC_MSG_CHECKING([kernel source directory])
 131         if test -z "$kernelsrc"; then
 132                 if test -e "/lib/modules/$(uname -r)/source"; then
 133                         headersdir="/lib/modules/$(uname -r)/source"
 134                         sourcelink=$(readlink -f "$headersdir")
 135                 elif test -e "/lib/modules/$(uname -r)/build"; then
 136                         headersdir="/lib/modules/$(uname -r)/build"
 137                         sourcelink=$(readlink -f "$headersdir")
 138                 else
 139                         sourcelink=$(ls -1d /usr/src/kernels/* \
 140                                      /usr/src/linux-* \
 141                                      2>/dev/null | grep -v obj | tail -1)
 142                 fi
 143
 144                 if test -n "$sourcelink" && test -e ${sourcelink}; then
 145                         kernelsrc=`readlink -f ${sourcelink}`
 146                 else
 147                         kernelsrc="[Not found]"
 148                 fi
 149         else
 150                 if test "$kernelsrc" = "NONE"; then
 151                         kernsrcver=NONE
 152                 fi
 153         fi
 154
 155         AC_MSG_RESULT([$kernelsrc])
 156         if test ! -d "$kernelsrc"; then
 157                 AC_MSG_ERROR([
 158         *** Please make sure the kernel devel package for your distribution
 159         *** is installed then try again.  If that fails you can specify the
 160         *** location of the kernel source with the '--with-linux=PATH' option.])
 161         fi
 162
 163         AC_MSG_CHECKING([kernel build directory])
 164         if test -z "$kernelbuild"; then
 165                 if test -e "/lib/modules/$(uname -r)/build"; then
 166                         kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
 167                 elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
 168                         kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
 169                 elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
 170                         kernelbuild=${kernelsrc}-obj/${target_cpu}/default
 171                 elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
 172                         kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
 173                 else
 174                         kernelbuild=${kernelsrc}
 175                 fi
 176         fi
 177         AC_MSG_RESULT([$kernelbuild])
 178
 179         AC_MSG_CHECKING([kernel source version])
 180         utsrelease1=$kernelbuild/include/linux/version.h
 181         utsrelease2=$kernelbuild/include/linux/utsrelease.h
 182         utsrelease3=$kernelbuild/include/generated/utsrelease.h
 183         if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
 184                 utsrelease=linux/version.h
 185         elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
 186                 utsrelease=linux/utsrelease.h
 187         elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
 188                 utsrelease=generated/utsrelease.h
 189         fi
 190
 191         if test "$utsrelease"; then
 192                 kernsrcver=`(echo "#include <$utsrelease>";
 193                              echo "kernsrcver=UTS_RELEASE") |
 194                              cpp -I $kernelbuild/include |
 195                              grep "^kernsrcver=" | cut -d \" -f 2`
 196
 197                 if test -z "$kernsrcver"; then
 198                         AC_MSG_RESULT([Not found])
 199                         AC_MSG_ERROR([*** Cannot determine kernel version.])
 200                 fi
 201         else
 202                 AC_MSG_RESULT([Not found])
 203                 if test "x$enable_linux_builtin" != xyes; then
 204                         AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
 205                 else
 206                         AC_MSG_ERROR([
 207         *** Cannot find UTS_RELEASE definition.
 208         *** Please run 'make prepare' inside the kernel source tree.])
 209                 fi
 210         fi
 211
 212         AC_MSG_RESULT([$kernsrcver])
 213
 214         LINUX=${kernelsrc}
 215         LINUX_OBJ=${kernelbuild}
 216         LINUX_VERSION=${kernsrcver}
 217
 218         AC_SUBST(LINUX)
 219         AC_SUBST(LINUX_OBJ)
 220         AC_SUBST(LINUX_VERSION)
 221
 222         SPL_AC_MODULE_SYMVERS
 223 ])
 224
 225 dnl #
 226 dnl # Default SPL user configuration
 227 dnl #
 228 AC_DEFUN([SPL_AC_CONFIG_USER], [])
 229
 230 dnl #
 231 dnl # Check for rpm+rpmbuild to build RPM packages.  If these tools
 232 dnl # are missing it is non-fatal but you will not be able to build
 233 dnl # RPM packages and will be warned if you try too.
 234 dnl #
 235 dnl # By default the generic spec file will be used because it requires
 236 dnl # minimal dependencies.  Distribution specific spec files can be
 237 dnl # placed under the 'rpm/<distribution>' directory and enabled using
 238 dnl # the --with-spec=<distribution> configure option.
 239 dnl #
 240 AC_DEFUN([SPL_AC_RPM], [
 241         RPM=rpm
 242         RPMBUILD=rpmbuild
 243
 244         AC_MSG_CHECKING([whether $RPM is available])
 245         AS_IF([tmp=$($RPM --version 2>/dev/null)], [
 246                 RPM_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
 247                 HAVE_RPM=yes
 248                 AC_MSG_RESULT([$HAVE_RPM ($RPM_VERSION)])
 249         ],[
 250                 HAVE_RPM=no
 251                 AC_MSG_RESULT([$HAVE_RPM])
 252         ])
 253
 254         AC_MSG_CHECKING([whether $RPMBUILD is available])
 255         AS_IF([tmp=$($RPMBUILD --version 2>/dev/null)], [
 256                 RPMBUILD_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
 257                 HAVE_RPMBUILD=yes
 258                 AC_MSG_RESULT([$HAVE_RPMBUILD ($RPMBUILD_VERSION)])
 259         ],[
 260                 HAVE_RPMBUILD=no
 261                 AC_MSG_RESULT([$HAVE_RPMBUILD])
 262         ])
 263
 264         RPM_DEFINE_COMMON='--define "$(DEBUG_SPL) 1" --define "$(DEBUG_LOG) 1" --define "$(DEBUG_KMEM) 1" --define "$(DEBUG_KMEM_TRACKING) 1"'
 265         RPM_DEFINE_UTIL=
 266         RPM_DEFINE_KMOD='--define "kernels $(LINUX_VERSION)"'
 267         RPM_DEFINE_DKMS=
 268
 269         SRPM_DEFINE_COMMON='--define "build_src_rpm 1"'
 270         SRPM_DEFINE_UTIL=
 271         SRPM_DEFINE_KMOD=
 272         SRPM_DEFINE_DKMS=
 273
 274         RPM_SPEC_DIR="rpm/generic"
 275         AC_ARG_WITH([spec],
 276                 AS_HELP_STRING([--with-spec=SPEC],
 277                 [Spec files 'generic|fedora']),
 278                 [RPM_SPEC_DIR="rpm/$withval"])
 279
 280         AC_MSG_CHECKING([whether spec files are available])
 281         AC_MSG_RESULT([yes ($RPM_SPEC_DIR/*.spec.in)])
 282
 283         AC_SUBST(HAVE_RPM)
 284         AC_SUBST(RPM)
 285         AC_SUBST(RPM_VERSION)
 286
 287         AC_SUBST(HAVE_RPMBUILD)
 288         AC_SUBST(RPMBUILD)
 289         AC_SUBST(RPMBUILD_VERSION)
 290
 291         AC_SUBST(RPM_SPEC_DIR)
 292         AC_SUBST(RPM_DEFINE_UTIL)
 293         AC_SUBST(RPM_DEFINE_KMOD)
 294         AC_SUBST(RPM_DEFINE_DKMS)
 295         AC_SUBST(RPM_DEFINE_COMMON)
 296         AC_SUBST(SRPM_DEFINE_UTIL)
 297         AC_SUBST(SRPM_DEFINE_KMOD)
 298         AC_SUBST(SRPM_DEFINE_DKMS)
 299         AC_SUBST(SRPM_DEFINE_COMMON)
 300 ])
 301
 302 dnl #
 303 dnl # Check for dpkg+dpkg-buildpackage to build DEB packages.  If these
 304 dnl # tools are missing it is non-fatal but you will not be able to build
 305 dnl # DEB packages and will be warned if you try too.
 306 dnl #
 307 AC_DEFUN([SPL_AC_DPKG], [
 308         DPKG=dpkg
 309         DPKGBUILD=dpkg-buildpackage
 310
 311         AC_MSG_CHECKING([whether $DPKG is available])
 312         AS_IF([tmp=$($DPKG --version 2>/dev/null)], [
 313                 DPKG_VERSION=$(echo $tmp | $AWK '/Debian/ { print $[7] }')
 314                 HAVE_DPKG=yes
 315                 AC_MSG_RESULT([$HAVE_DPKG ($DPKG_VERSION)])
 316         ],[
 317                 HAVE_DPKG=no
 318                 AC_MSG_RESULT([$HAVE_DPKG])
 319         ])
 320
 321         AC_MSG_CHECKING([whether $DPKGBUILD is available])
 322         AS_IF([tmp=$($DPKGBUILD --version 2>/dev/null)], [
 323                 DPKGBUILD_VERSION=$(echo $tmp | \
 324                     $AWK '/Debian/ { print $[4] }' | cut -f-4 -d'.')
 325                 HAVE_DPKGBUILD=yes
 326                 AC_MSG_RESULT([$HAVE_DPKGBUILD ($DPKGBUILD_VERSION)])
 327         ],[
 328                 HAVE_DPKGBUILD=no
 329                 AC_MSG_RESULT([$HAVE_DPKGBUILD])
 330         ])
 331
 332         AC_SUBST(HAVE_DPKG)
 333         AC_SUBST(DPKG)
 334         AC_SUBST(DPKG_VERSION)
 335
 336         AC_SUBST(HAVE_DPKGBUILD)
 337         AC_SUBST(DPKGBUILD)
 338         AC_SUBST(DPKGBUILD_VERSION)
 339 ])
 340
 341 dnl #
 342 dnl # Until native packaging for various different packing systems
 343 dnl # can be added the least we can do is attempt to use alien to
 344 dnl # convert the RPM packages to the needed package type.  This is
 345 dnl # a hack but so far it has worked reasonable well.
 346 dnl #
 347 AC_DEFUN([SPL_AC_ALIEN], [
 348         ALIEN=alien
 349
 350         AC_MSG_CHECKING([whether $ALIEN is available])
 351         AS_IF([tmp=$($ALIEN --version 2>/dev/null)], [
 352                 ALIEN_VERSION=$(echo $tmp | $AWK '{ print $[3] }')
 353                 HAVE_ALIEN=yes
 354                 AC_MSG_RESULT([$HAVE_ALIEN ($ALIEN_VERSION)])
 355         ],[
 356                 HAVE_ALIEN=no
 357                 AC_MSG_RESULT([$HAVE_ALIEN])
 358         ])
 359
 360         AC_SUBST(HAVE_ALIEN)
 361         AC_SUBST(ALIEN)
 362         AC_SUBST(ALIEN_VERSION)
 363 ])
 364
 365 dnl #
 366 dnl # Using the VENDOR tag from config.guess set the default
 367 dnl # package type for 'make pkg': (rpm | deb | tgz)
 368 dnl #
 369 AC_DEFUN([SPL_AC_DEFAULT_PACKAGE], [
 370         AC_MSG_CHECKING([linux distribution])
 371         if test -f /etc/toss-release ; then
 372                 VENDOR=toss ;
 373         elif test -f /etc/fedora-release ; then
 374                 VENDOR=fedora ;
 375         elif test -f /etc/redhat-release ; then
 376                 VENDOR=redhat ;
 377         elif test -f /etc/gentoo-release ; then
 378                 VENDOR=gentoo ;
 379         elif test -f /etc/arch-release ; then
 380                 VENDOR=arch ;
 381         elif test -f /etc/SuSE-release ; then
 382                 VENDOR=sles ;
 383         elif test -f /etc/slackware-version ; then
 384                 VENDOR=slackware ;
 385         elif test -f /etc/lunar.release ; then
 386                 VENDOR=lunar ;
 387         elif test -f /etc/lsb-release ; then
 388                 VENDOR=ubuntu ;
 389         elif test -f /etc/debian_version ; then
 390                 VENDOR=debian ;
 391         else
 392                 VENDOR= ;
 393         fi
 394         AC_MSG_RESULT([$VENDOR])
 395         AC_SUBST(VENDOR)
 396
 397         AC_MSG_CHECKING([default package type])
 398         case "$VENDOR" in
 399                 toss)       DEFAULT_PACKAGE=rpm  ;;
 400                 redhat)     DEFAULT_PACKAGE=rpm  ;;
 401                 fedora)     DEFAULT_PACKAGE=rpm  ;;
 402                 gentoo)     DEFAULT_PACKAGE=tgz  ;;
 403                 arch)       DEFAULT_PACKAGE=tgz  ;;
 404                 sles)       DEFAULT_PACKAGE=rpm  ;;
 405                 slackware)  DEFAULT_PACKAGE=tgz  ;;
 406                 lunar)      DEFAULT_PACKAGE=tgz  ;;
 407                 ubuntu)     DEFAULT_PACKAGE=deb  ;;
 408                 debian)     DEFAULT_PACKAGE=deb  ;;
 409                 *)          DEFAULT_PACKAGE=rpm  ;;
 410         esac
 411
 412         AC_MSG_RESULT([$DEFAULT_PACKAGE])
 413         AC_SUBST(DEFAULT_PACKAGE)
 414 ])
 415
 416 dnl #
 417 dnl # Default SPL user configuration
 418 dnl #
 419 AC_DEFUN([SPL_AC_PACKAGE], [
 420         SPL_AC_DEFAULT_PACKAGE
 421         SPL_AC_RPM
 422         SPL_AC_DPKG
 423         SPL_AC_ALIEN
 424 ])
 425
 426 AC_DEFUN([SPL_AC_LICENSE], [
 427         AC_MSG_CHECKING([spl license])
 428         LICENSE=GPL
 429         AC_MSG_RESULT([$LICENSE])
 430         KERNELCPPFLAGS="${KERNELCPPFLAGS} -DHAVE_GPL_ONLY_SYMBOLS"
 431         AC_SUBST(LICENSE)
 432 ])
 433
 434 AC_DEFUN([SPL_AC_CONFIG], [
 435         SPL_CONFIG=all
 436         AC_ARG_WITH([config],
 437                 AS_HELP_STRING([--with-config=CONFIG],
 438                 [Config file 'kernel|user|all|srpm']),
 439                 [SPL_CONFIG="$withval"])
 440         AC_ARG_ENABLE([linux-builtin],
 441                 [AC_HELP_STRING([--enable-linux-builtin],
 442                 [Configure for builtin in-tree kernel modules @<:@default=no@:>@])],
 443                 [],
 444                 [enable_linux_builtin=no])
 445
 446         AC_MSG_CHECKING([spl config])
 447         AC_MSG_RESULT([$SPL_CONFIG]);
 448         AC_SUBST(SPL_CONFIG)
 449
 450         case "$SPL_CONFIG" in
 451                 kernel) SPL_AC_CONFIG_KERNEL ;;
 452                 user)   SPL_AC_CONFIG_USER   ;;
 453                 all)    SPL_AC_CONFIG_KERNEL
 454                         SPL_AC_CONFIG_USER   ;;
 455                 srpm)                        ;;
 456                 *)
 457                 AC_MSG_RESULT([Error!])
 458                 AC_MSG_ERROR([Bad value "$SPL_CONFIG" for --with-config,
 459                              user kernel|user|all|srpm]) ;;
 460         esac
 461
 462         AM_CONDITIONAL([CONFIG_USER],
 463                        [test "$SPL_CONFIG" = user -o "$SPL_CONFIG" = all])
 464         AM_CONDITIONAL([CONFIG_KERNEL],
 465                        [test "$SPL_CONFIG" = kernel -o "$SPL_CONFIG" = all] &&
 466                        [test "x$enable_linux_builtin" != xyes ])
 467 ])
 468
 469 dnl #
 470 dnl # Enable if the SPL should be compiled with internal debugging enabled.
 471 dnl # By default this support is disabled.
 472 dnl #
 473 AC_DEFUN([SPL_AC_DEBUG], [
 474         AC_MSG_CHECKING([whether debugging is enabled])
 475         AC_ARG_ENABLE([debug],
 476                 [AS_HELP_STRING([--enable-debug],
 477                 [Enable generic debug support @<:@default=no@:>@])],
 478                 [],
 479                 [enable_debug=no])
 480
 481         AS_IF([test "x$enable_debug" = xyes],
 482         [
 483                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG -Werror"
 484                 DEBUG_CFLAGS="-DDEBUG -Werror"
 485                 DEBUG_SPL="_with_debug"
 486         ], [
 487                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DNDEBUG"
 488                 DEBUG_CFLAGS="-DNDEBUG"
 489                 DEBUG_SPL="_without_debug"
 490         ])
 491
 492         AC_SUBST(DEBUG_CFLAGS)
 493         AC_SUBST(DEBUG_SPL)
 494         AC_MSG_RESULT([$enable_debug])
 495 ])
 496
 497 dnl #
 498 dnl # Enabled by default it provides a basic debug log infrastructure.
 499 dnl # Each subsystem registers itself with a name and logs messages
 500 dnl # using predefined types.  If the debug mask it set to allow the
 501 dnl # message type it will be written to the internal log.  The log
 502 dnl # can be dumped to a file by echoing 1 to the 'dump' proc entry,
 503 dnl # after dumping the log it must be decoded using the spl utility.
 504 dnl #
 505 dnl # echo 1 >/proc/sys/kernel/spl/debug/dump
 506 dnl # spl /tmp/spl-log.xxx.yyy /tmp/spl-log.xxx.yyy.txt
 507 dnl #
 508 AC_DEFUN([SPL_AC_DEBUG_LOG], [
 509         AC_ARG_ENABLE([debug-log],
 510                 [AS_HELP_STRING([--enable-debug-log],
 511                 [Enable basic debug logging @<:@default=yes@:>@])],
 512                 [],
 513                 [enable_debug_log=yes])
 514
 515         AS_IF([test "x$enable_debug_log" = xyes],
 516         [
 517                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_LOG"
 518                 DEBUG_LOG="_with_debug_log"
 519                 AC_DEFINE([DEBUG_LOG], [1],
 520                 [Define to 1 to enable basic debug logging])
 521         ], [
 522                 DEBUG_LOG="_without_debug_log"
 523         ])
 524
 525         AC_SUBST(DEBUG_LOG)
 526         AC_MSG_CHECKING([whether basic debug logging is enabled])
 527         AC_MSG_RESULT([$enable_debug_log])
 528 ])
 529
 530 dnl #
 531 dnl # Enabled by default it provides a minimal level of memory tracking.
 532 dnl # A total count of bytes allocated is kept for each alloc and free.
 533 dnl # Then at module unload time a report to the console will be printed
 534 dnl # if memory was leaked.  Additionally, /proc/spl/kmem/slab will exist
 535 dnl # and provide an easy way to inspect the kmem based slab.
 536 dnl #
 537 AC_DEFUN([SPL_AC_DEBUG_KMEM], [
 538         AC_ARG_ENABLE([debug-kmem],
 539                 [AS_HELP_STRING([--enable-debug-kmem],
 540                 [Enable basic kmem accounting @<:@default=yes@:>@])],
 541                 [],
 542                 [enable_debug_kmem=yes])
 543
 544         AS_IF([test "x$enable_debug_kmem" = xyes],
 545         [
 546                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM"
 547                 DEBUG_KMEM="_with_debug_kmem"
 548                 AC_DEFINE([DEBUG_KMEM], [1],
 549                 [Define to 1 to enable basic kmem accounting])
 550         ], [
 551                 DEBUG_KMEM="_without_debug_kmem"
 552         ])
 553
 554         AC_SUBST(DEBUG_KMEM)
 555         AC_MSG_CHECKING([whether basic kmem accounting is enabled])
 556         AC_MSG_RESULT([$enable_debug_kmem])
 557 ])
 558
 559 dnl #
 560 dnl # Disabled by default it provides detailed memory tracking.  This
 561 dnl # feature also requires --enable-debug-kmem to be set.  When enabled
 562 dnl # not only will total bytes be tracked but also the location of every
 563 dnl # alloc and free.  When the SPL module is unloaded a list of all leaked
 564 dnl # addresses and where they were allocated will be dumped to the console.
 565 dnl # Enabling this feature has a significant impact on performance but it
 566 dnl # makes finding memory leaks pretty straight forward.
 567 dnl #
 568 AC_DEFUN([SPL_AC_DEBUG_KMEM_TRACKING], [
 569         AC_ARG_ENABLE([debug-kmem-tracking],
 570                 [AS_HELP_STRING([--enable-debug-kmem-tracking],
 571                 [Enable detailed kmem tracking  @<:@default=no@:>@])],
 572                 [],
 573                 [enable_debug_kmem_tracking=no])
 574
 575         AS_IF([test "x$enable_debug_kmem_tracking" = xyes],
 576         [
 577                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM_TRACKING"
 578                 DEBUG_KMEM_TRACKING="_with_debug_kmem_tracking"
 579                 AC_DEFINE([DEBUG_KMEM_TRACKING], [1],
 580                 [Define to 1 to enable detailed kmem tracking])
 581         ], [
 582                 DEBUG_KMEM_TRACKING="_without_debug_kmem_tracking"
 583         ])
 584
 585         AC_SUBST(DEBUG_KMEM_TRACKING)
 586         AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
 587         AC_MSG_RESULT([$enable_debug_kmem_tracking])
 588 ])
 589
 590 dnl #
 591 dnl # SPL_LINUX_CONFTEST
 592 dnl #
 593 AC_DEFUN([SPL_LINUX_CONFTEST], [
 594 cat confdefs.h - <<_ACEOF >conftest.c
 595 $1
 596 _ACEOF
 597 ])
 598
 599 dnl #
 600 dnl # SPL_LANG_PROGRAM(C)([PROLOGUE], [BODY])
 601 dnl #
 602 m4_define([SPL_LANG_PROGRAM], [
 603 $1
 604 int
 605 main (void)
 606 {
 607 dnl Do *not* indent the following line: there may be CPP directives.
 608 dnl Don't move the `;' right after for the same reason.
 609 $2
 610   ;
 611   return 0;
 612 }
 613 ])
 614
 615 dnl #
 616 dnl # SPL_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
 617 dnl #
 618 AC_DEFUN([SPL_LINUX_COMPILE_IFELSE], [
 619         m4_ifvaln([$1], [SPL_LINUX_CONFTEST([$1])])
 620         rm -Rf build && mkdir -p build && touch build/conftest.mod.c
 621         echo "obj-m := conftest.o" >build/Makefile
 622         modpost_flag=''
 623         test "x$enable_linux_builtin" = xyes && modpost_flag='modpost=true' # fake modpost stage
 624         AS_IF(
 625                 [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])],
 626                 [$4],
 627                 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
 628         )
 629         rm -Rf build
 630 ])
 631
 632 dnl #
 633 dnl # SPL_LINUX_TRY_COMPILE like AC_TRY_COMPILE
 634 dnl #
 635 AC_DEFUN([SPL_LINUX_TRY_COMPILE],
 636         [SPL_LINUX_COMPILE_IFELSE(
 637         [AC_LANG_SOURCE([SPL_LANG_PROGRAM([[$1]], [[$2]])])],
 638         [modules],
 639         [test -s build/conftest.o],
 640         [$3], [$4])
 641 ])
 642
 643 dnl #
 644 dnl # SPL_CHECK_SYMBOL_EXPORT
 645 dnl # check symbol exported or not
 646 dnl #
 647 AC_DEFUN([SPL_CHECK_SYMBOL_EXPORT], [
 648         grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
 649                 $LINUX_OBJ/Module*.symvers 2>/dev/null
 650         rc=$?
 651         if test $rc -ne 0; then
 652                 export=0
 653                 for file in $2; do
 654                         grep -q -E "EXPORT_SYMBOL.*($1)" \
 655                                 "$LINUX_OBJ/$file" 2>/dev/null
 656                         rc=$?
 657                         if test $rc -eq 0; then
 658                                 export=1
 659                                 break;
 660                         fi
 661                 done
 662                 if test $export -eq 0; then :
 663                         $4
 664                 else :
 665                         $3
 666                 fi
 667         else :
 668                 $3
 669         fi
 670 ])
 671
 672 dnl #
 673 dnl # SPL_LINUX_TRY_COMPILE_SYMBOL
 674 dnl # like SPL_LINUX_TRY_COMPILE, except SPL_CHECK_SYMBOL_EXPORT
 675 dnl # is called if not compiling for builtin
 676 dnl #
 677 AC_DEFUN([SPL_LINUX_TRY_COMPILE_SYMBOL], [
 678         SPL_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
 679         if test $rc -ne 0; then :
 680                 $6
 681         else
 682                 if test "x$enable_linux_builtin" != xyes; then
 683                         SPL_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
 684                 fi
 685                 if test $rc -ne 0; then :
 686                         $6
 687                 else :
 688                         $5
 689                 fi
 690         fi
 691 ])
 692
 693 dnl #
 694 dnl # SPL_CHECK_SYMBOL_HEADER
 695 dnl # check if a symbol prototype is defined in listed headers.
 696 dnl #
 697 AC_DEFUN([SPL_CHECK_SYMBOL_HEADER], [
 698         AC_MSG_CHECKING([whether symbol $1 exists in header])
 699         header=0
 700         for file in $3; do
 701                 grep -q "$2" "$LINUX/$file" 2>/dev/null
 702                 rc=$?
 703                 if test $rc -eq 0; then
 704                         header=1
 705                         break;
 706                 fi
 707         done
 708         if test $header -eq 0; then
 709                 AC_MSG_RESULT([no])
 710                 $5
 711         else
 712                 AC_MSG_RESULT([yes])
 713                 $4
 714         fi
 715 ])
 716
 717 dnl #
 718 dnl # SPL_CHECK_HEADER
 719 dnl # check whether header exists and define HAVE_$2_HEADER
 720 dnl #
 721 AC_DEFUN([SPL_CHECK_HEADER],
 722         [AC_MSG_CHECKING([whether header $1 exists])
 723         SPL_LINUX_TRY_COMPILE([
 724                 #include <$1>
 725         ],[
 726                 return 0;
 727         ],[
 728                 AC_DEFINE(HAVE_$2_HEADER, 1, [$1 exists])
 729                 AC_MSG_RESULT(yes)
 730                 $3
 731         ],[
 732                 AC_MSG_RESULT(no)
 733                 $4
 734         ])
 735 ])
 736
 737 dnl #
 738 dnl # Basic toolchain sanity check.
 739 dnl #
 740 AC_DEFUN([SPL_AC_TEST_MODULE],
 741         [AC_MSG_CHECKING([whether modules can be built])
 742         SPL_LINUX_TRY_COMPILE([],[],[
 743                 AC_MSG_RESULT([yes])
 744         ],[
 745                 AC_MSG_RESULT([no])
 746                 if test "x$enable_linux_builtin" != xyes; then
 747                         AC_MSG_ERROR([*** Unable to build an empty module.])
 748                 else
 749                         AC_MSG_ERROR([
 750         *** Unable to build an empty module.
 751         *** Please run 'make scripts' inside the kernel source tree.])
 752                 fi
 753         ])
 754 ])
 755
 756 dnl #
 757 dnl # Use the atomic implemenation based on global spinlocks.  This
 758 dnl # should only be needed by 32-bit kernels which do not provide
 759 dnl # the atomic64_* API.  It may be optionally enabled as a fallback
 760 dnl # if problems are observed with the direct mapping to the native
 761 dnl # Linux atomic operations.  You may not disable atomic spinlocks
 762 dnl # if you kernel does not an atomic64_* API.
 763 dnl #
 764 AC_DEFUN([SPL_AC_ATOMIC_SPINLOCK], [
 765         AC_ARG_ENABLE([atomic-spinlocks],
 766                 [AS_HELP_STRING([--enable-atomic-spinlocks],
 767                 [Atomic types use spinlocks @<:@default=check@:>@])],
 768                 [],
 769                 [enable_atomic_spinlocks=check])
 770
 771         SPL_LINUX_TRY_COMPILE([
 772                 #include <linux/fs.h>
 773         ],[
 774                 atomic64_t *ptr __attribute__ ((unused));
 775         ],[
 776                 have_atomic64_t=yes
 777                 AC_DEFINE(HAVE_ATOMIC64_T, 1,
 778                         [kernel defines atomic64_t])
 779         ],[
 780                 have_atomic64_t=no
 781         ])
 782
 783         AS_IF([test "x$enable_atomic_spinlocks" = xcheck], [
 784                 AS_IF([test "x$have_atomic64_t" = xyes], [
 785                         enable_atomic_spinlocks=no
 786                 ],[
 787                         enable_atomic_spinlocks=yes
 788                 ])
 789         ])
 790
 791         AS_IF([test "x$enable_atomic_spinlocks" = xyes], [
 792                 AC_DEFINE([ATOMIC_SPINLOCK], [1],
 793                         [Atomic types use spinlocks])
 794         ],[
 795                 AS_IF([test "x$have_atomic64_t" = xno], [
 796                         AC_MSG_FAILURE(
 797                         [--disable-atomic-spinlocks given but required atomic64 support is unavailable])
 798                 ])
 799         ])
 800
 801         AC_MSG_CHECKING([whether atomic types use spinlocks])
 802         AC_MSG_RESULT([$enable_atomic_spinlocks])
 803
 804         AC_MSG_CHECKING([whether kernel defines atomic64_t])
 805         AC_MSG_RESULT([$have_atomic64_t])
 806 ])
 807
 808 dnl #
 809 dnl # 2.6.24 API change,
 810 dnl # check if atomic64_cmpxchg is defined
 811 dnl #
 812 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_CMPXCHG],
 813         [AC_MSG_CHECKING([whether kernel defines atomic64_cmpxchg])
 814         SPL_LINUX_TRY_COMPILE([
 815                 #include <linux/fs.h>
 816         ],[
 817                 atomic64_cmpxchg((atomic64_t *)NULL, 0, 0);
 818         ],[
 819                 AC_MSG_RESULT([yes])
 820                 AC_DEFINE(HAVE_ATOMIC64_CMPXCHG, 1,
 821                           [kernel defines atomic64_cmpxchg])
 822         ],[
 823                 AC_MSG_RESULT([no])
 824         ])
 825 ])
 826
 827 dnl #
 828 dnl # 2.6.24 API change,
 829 dnl # check if atomic64_xchg is defined
 830 dnl #
 831 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_XCHG],
 832         [AC_MSG_CHECKING([whether kernel defines atomic64_xchg])
 833         SPL_LINUX_TRY_COMPILE([
 834                 #include <linux/fs.h>
 835         ],[
 836                 atomic64_xchg((atomic64_t *)NULL, 0);
 837         ],[
 838                 AC_MSG_RESULT([yes])
 839                 AC_DEFINE(HAVE_ATOMIC64_XCHG, 1,
 840                           [kernel defines atomic64_xchg])
 841         ],[
 842                 AC_MSG_RESULT([no])
 843         ])
 844 ])
 845
 846 dnl #
 847 dnl # 2.6.24 API change,
 848 dnl # check if uintptr_t typedef is defined
 849 dnl #
 850 AC_DEFUN([SPL_AC_TYPE_UINTPTR_T],
 851         [AC_MSG_CHECKING([whether kernel defines uintptr_t])
 852         SPL_LINUX_TRY_COMPILE([
 853                 #include <linux/types.h>
 854         ],[
 855                 uintptr_t *ptr __attribute__ ((unused));
 856         ],[
 857                 AC_MSG_RESULT([yes])
 858                 AC_DEFINE(HAVE_UINTPTR_T, 1,
 859                           [kernel defines uintptr_t])
 860         ],[
 861                 AC_MSG_RESULT([no])
 862         ])
 863 ])
 864
 865 dnl #
 866 dnl # 2.6.21 API change,
 867 dnl # 'register_sysctl_table' use only one argument instead of two
 868 dnl #
 869 AC_DEFUN([SPL_AC_2ARGS_REGISTER_SYSCTL],
 870         [AC_MSG_CHECKING([whether register_sysctl_table() wants 2 args])
 871         SPL_LINUX_TRY_COMPILE([
 872                 #include <linux/sysctl.h>
 873         ],[
 874                 (void) register_sysctl_table(NULL, 0);
 875         ],[
 876                 AC_MSG_RESULT(yes)
 877                 AC_DEFINE(HAVE_2ARGS_REGISTER_SYSCTL, 1,
 878                           [register_sysctl_table() wants 2 args])
 879         ],[
 880                 AC_MSG_RESULT(no)
 881         ])
 882 ])
 883
 884 dnl #
 885 dnl # 2.6.23 API change
 886 dnl # Old set_shrinker API replaced with register_shrinker
 887 dnl #
 888 AC_DEFUN([SPL_AC_SET_SHRINKER], [
 889         AC_MSG_CHECKING([whether set_shrinker() available])
 890         SPL_LINUX_TRY_COMPILE([
 891                 #include <linux/mm.h>
 892         ],[
 893                 return set_shrinker(DEFAULT_SEEKS, NULL);
 894         ],[
 895                 AC_MSG_RESULT([yes])
 896                 AC_DEFINE(HAVE_SET_SHRINKER, 1,
 897                           [set_shrinker() available])
 898         ],[
 899                 AC_MSG_RESULT([no])
 900         ])
 901 ])
 902
 903 dnl #
 904 dnl # 2.6.35 API change,
 905 dnl # Add context to shrinker callback
 906 dnl #
 907 AC_DEFUN([SPL_AC_3ARGS_SHRINKER_CALLBACK],
 908         [AC_MSG_CHECKING([whether shrinker callback wants 3 args])
 909         tmp_flags="$EXTRA_KCFLAGS"
 910         EXTRA_KCFLAGS="-Werror"
 911         SPL_LINUX_TRY_COMPILE([
 912                 #include <linux/mm.h>
 913
 914                 int shrinker_cb(struct shrinker *, int, unsigned int);
 915         ],[
 916                 struct shrinker cache_shrinker = {
 917                         .shrink = shrinker_cb,
 918                         .seeks = DEFAULT_SEEKS,
 919                 };
 920                 register_shrinker(&cache_shrinker);
 921         ],[
 922                 AC_MSG_RESULT(yes)
 923                 AC_DEFINE(HAVE_3ARGS_SHRINKER_CALLBACK, 1,
 924                           [shrinker callback wants 3 args])
 925         ],[
 926                 AC_MSG_RESULT(no)
 927         ])
 928         EXTRA_KCFLAGS="$tmp_flags"
 929 ])
 930
 931 dnl #
 932 dnl # 2.6.25 API change,
 933 dnl # struct path entry added to struct nameidata
 934 dnl #
 935 AC_DEFUN([SPL_AC_PATH_IN_NAMEIDATA],
 936         [AC_MSG_CHECKING([whether struct path used in struct nameidata])
 937         SPL_LINUX_TRY_COMPILE([
 938                 #include <linux/namei.h>
 939         ],[
 940                 struct nameidata nd __attribute__ ((unused));
 941
 942                 nd.path.mnt = NULL;
 943                 nd.path.dentry = NULL;
 944         ],[
 945                 AC_MSG_RESULT(yes)
 946                 AC_DEFINE(HAVE_PATH_IN_NAMEIDATA, 1,
 947                           [struct path used in struct nameidata])
 948         ],[
 949                 AC_MSG_RESULT(no)
 950         ])
 951 ])
 952
 953 dnl #
 954 dnl # Custom SPL patch may export this system it is not required
 955 dnl #
 956 AC_DEFUN([SPL_AC_TASK_CURR],
 957         [AC_MSG_CHECKING([whether task_curr() is available])
 958         SPL_LINUX_TRY_COMPILE_SYMBOL([
 959                 #include <linux/sched.h>
 960         ], [
 961                 task_curr(NULL);
 962         ], [task_curr], [kernel/sched.c], [
 963                 AC_MSG_RESULT(yes)
 964                 AC_DEFINE(HAVE_TASK_CURR, 1, [task_curr() is available])
 965         ], [
 966                 AC_MSG_RESULT(no)
 967         ])
 968 ])
 969
 970 dnl #
 971 dnl # 2.6.19 API change,
 972 dnl # Use CTL_UNNUMBERED when binary sysctl is not required
 973 dnl #
 974 AC_DEFUN([SPL_AC_CTL_UNNUMBERED],
 975         [AC_MSG_CHECKING([whether unnumbered sysctl support exists])
 976         SPL_LINUX_TRY_COMPILE([
 977                 #include <linux/sysctl.h>
 978         ],[
 979                 #ifndef CTL_UNNUMBERED
 980                 #error CTL_UNNUMBERED undefined
 981                 #endif
 982         ],[
 983                 AC_MSG_RESULT(yes)
 984                 AC_DEFINE(HAVE_CTL_UNNUMBERED, 1,
 985                           [unnumbered sysctl support exists])
 986         ],[
 987                 AC_MSG_RESULT(no)
 988         ])
 989 ])
 990
 991 dnl #
 992 dnl # 2.6.33 API change,
 993 dnl # Removed .ctl_name from struct ctl_table.
 994 dnl #
 995 AC_DEFUN([SPL_AC_CTL_NAME], [
 996         AC_MSG_CHECKING([whether struct ctl_table has ctl_name])
 997         SPL_LINUX_TRY_COMPILE([
 998                 #include <linux/sysctl.h>
 999         ],[
1000                 struct ctl_table ctl __attribute__ ((unused));
1001                 ctl.ctl_name = 0;
1002         ],[
1003                 AC_MSG_RESULT(yes)
1004                 AC_DEFINE(HAVE_CTL_NAME, 1, [struct ctl_table has ctl_name])
1005         ],[
1006                 AC_MSG_RESULT(no)
1007         ])
1008 ])
1009
1010 dnl #
1011 dnl # 2.6.16 API change.
1012 dnl # Check if 'fls64()' is available
1013 dnl #
1014 AC_DEFUN([SPL_AC_FLS64],
1015         [AC_MSG_CHECKING([whether fls64() is available])
1016         SPL_LINUX_TRY_COMPILE([
1017                 #include <linux/bitops.h>
1018         ],[
1019                 return fls64(0);
1020         ],[
1021                 AC_MSG_RESULT(yes)
1022                 AC_DEFINE(HAVE_FLS64, 1, [fls64() is available])
1023         ],[
1024                 AC_MSG_RESULT(no)
1025         ])
1026 ])
1027
1028 dnl #
1029 dnl # 2.6.18 API change, check whether device_create() is available.
1030 dnl # Device_create() was introduced in 2.6.18 and depricated
1031 dnl # class_device_create() which was fully removed in 2.6.26.
1032 dnl #
1033 AC_DEFUN([SPL_AC_DEVICE_CREATE],
1034         [AC_MSG_CHECKING([whether device_create() is available])
1035         SPL_CHECK_SYMBOL_EXPORT([device_create], [drivers/base/core.c], [
1036                 AC_MSG_RESULT(yes)
1037                 AC_DEFINE(HAVE_DEVICE_CREATE, 1,
1038                           [device_create() is available])
1039         ], [
1040                 AC_MSG_RESULT(no)
1041         ])
1042 ])
1043
1044 dnl #
1045 dnl # 2.6.27 API change,
1046 dnl # device_create() uses 5 args, new 'drvdata' argument.
1047 dnl #
1048 AC_DEFUN([SPL_AC_5ARGS_DEVICE_CREATE], [
1049         AC_MSG_CHECKING([whether device_create() wants 5 args])
1050         tmp_flags="$EXTRA_KCFLAGS"
1051         EXTRA_KCFLAGS="-Werror"
1052         SPL_LINUX_TRY_COMPILE([
1053                 #include <linux/device.h>
1054         ],[
1055                 device_create(NULL, NULL, 0, NULL, "%d", 1);
1056         ],[
1057                 AC_MSG_RESULT(yes)
1058                 AC_DEFINE(HAVE_5ARGS_DEVICE_CREATE, 1,
1059                           [device_create wants 5 args])
1060         ],[
1061                 AC_MSG_RESULT(no)
1062         ])
1063         EXTRA_KCFLAGS="$tmp_flags"
1064 ])
1065
1066 dnl #
1067 dnl # 2.6.13 API change, check whether class_device_create() is available.
1068 dnl # Class_device_create() was introduced in 2.6.13 and depricated
1069 dnl # class_simple_device_add() which was fully removed in 2.6.13.
1070 dnl #
1071 AC_DEFUN([SPL_AC_CLASS_DEVICE_CREATE],
1072         [AC_MSG_CHECKING([whether class_device_create() is available])
1073         SPL_LINUX_TRY_COMPILE_SYMBOL([
1074                 #include <linux/device.h>
1075         ], [
1076                 class_device_create(NULL, NULL, 0, NULL, NULL);
1077         ], [class_device_create], [drivers/base/class.c], [
1078                 AC_MSG_RESULT(yes)
1079                 AC_DEFINE(HAVE_CLASS_DEVICE_CREATE, 1,
1080                           [class_device_create() is available])
1081         ], [
1082                 AC_MSG_RESULT(no)
1083         ])
1084 ])
1085
1086 dnl #
1087 dnl # 2.6.26 API change, set_normalized_timespec() is exported.
1088 dnl #
1089 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT],
1090         [AC_MSG_CHECKING([whether set_normalized_timespec() is available as export])
1091         SPL_LINUX_TRY_COMPILE_SYMBOL([
1092                 #include <linux/time.h>
1093         ], [
1094                 set_normalized_timespec(NULL, 0, 0);
1095         ], [set_normalized_timespec], [kernel/time.c], [
1096                 AC_MSG_RESULT(yes)
1097                 AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_EXPORT, 1,
1098                           [set_normalized_timespec() is available as export])
1099         ], [
1100                 AC_MSG_RESULT(no)
1101         ])
1102 ])
1103
1104 dnl #
1105 dnl # 2.6.16 API change, set_normalize_timespec() moved to time.c
1106 dnl # previously it was available in time.h as an inline.
1107 dnl #
1108 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE], [
1109         AC_MSG_CHECKING([whether set_normalized_timespec() is an inline])
1110         SPL_LINUX_TRY_COMPILE([
1111                 #include <linux/time.h>
1112                 void set_normalized_timespec(struct timespec *ts,
1113                                              time_t sec, long nsec) { }
1114         ],
1115         [],
1116         [
1117                 AC_MSG_RESULT(no)
1118         ],[
1119                 AC_MSG_RESULT(yes)
1120                 AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_INLINE, 1,
1121                           [set_normalized_timespec() is available as inline])
1122         ])
1123 ])
1124
1125 dnl #
1126 dnl # 2.6.18 API change,
1127 dnl # timespec_sub() inline function available in linux/time.h
1128 dnl #
1129 AC_DEFUN([SPL_AC_TIMESPEC_SUB], [
1130         AC_MSG_CHECKING([whether timespec_sub() is available])
1131         SPL_LINUX_TRY_COMPILE([
1132                 #include <linux/time.h>
1133         ],[
1134                 struct timespec a = { 0 };
1135                 struct timespec b = { 0 };
1136                 struct timespec c __attribute__ ((unused));
1137                 c = timespec_sub(a, b);
1138         ],[
1139                 AC_MSG_RESULT(yes)
1140                 AC_DEFINE(HAVE_TIMESPEC_SUB, 1, [timespec_sub() is available])
1141         ],[
1142                 AC_MSG_RESULT(no)
1143         ])
1144 ])
1145
1146 dnl #
1147 dnl # 2.6.19 API change,
1148 dnl # check if init_utsname() is available in linux/utsname.h
1149 dnl #
1150 AC_DEFUN([SPL_AC_INIT_UTSNAME], [
1151         AC_MSG_CHECKING([whether init_utsname() is available])
1152         SPL_LINUX_TRY_COMPILE([
1153                 #include <linux/utsname.h>
1154         ],[
1155                 struct new_utsname *a __attribute__ ((unused));
1156                 a = init_utsname();
1157         ],[
1158                 AC_MSG_RESULT(yes)
1159                 AC_DEFINE(HAVE_INIT_UTSNAME, 1, [init_utsname() is available])
1160         ],[
1161                 AC_MSG_RESULT(no)
1162         ])
1163 ])
1164
1165 dnl #
1166 dnl # 2.6.18 API change,
1167 dnl # added linux/uaccess.h
1168 dnl #
1169 AC_DEFUN([SPL_AC_UACCESS_HEADER], [
1170         SPL_CHECK_HEADER([linux/uaccess.h], [UACCESS], [], [])
1171 ])
1172
1173 dnl #
1174 dnl # 2.6.12 API change,
1175 dnl # check whether 'kmalloc_node()' is available.
1176 dnl #
1177 AC_DEFUN([SPL_AC_KMALLOC_NODE], [
1178         AC_MSG_CHECKING([whether kmalloc_node() is available])
1179         SPL_LINUX_TRY_COMPILE([
1180                 #include <linux/slab.h>
1181         ],[
1182                 void *a __attribute__ ((unused));
1183                 a = kmalloc_node(1, GFP_KERNEL, 0);
1184         ],[
1185                 AC_MSG_RESULT(yes)
1186                 AC_DEFINE(HAVE_KMALLOC_NODE, 1, [kmalloc_node() is available])
1187         ],[
1188                 AC_MSG_RESULT(no)
1189         ])
1190 ])
1191
1192 dnl #
1193 dnl # 2.6.9 API change,
1194 dnl # check whether 'monotonic_clock()' is available it may
1195 dnl # be available for some archs but not others.
1196 dnl #
1197 AC_DEFUN([SPL_AC_MONOTONIC_CLOCK],
1198         [AC_MSG_CHECKING([whether monotonic_clock() is available])
1199         SPL_LINUX_TRY_COMPILE_SYMBOL([
1200                 #include <linux/timex.h>
1201         ], [
1202                 monotonic_clock();
1203         ], [monotonic_clock], [], [
1204                 AC_MSG_RESULT(yes)
1205                 AC_DEFINE(HAVE_MONOTONIC_CLOCK, 1,
1206                           [monotonic_clock() is available])
1207         ], [
1208                 AC_MSG_RESULT(no)
1209         ])
1210 ])
1211
1212 dnl #
1213 dnl # 2.6.16 API change,
1214 dnl # check whether 'struct inode' has i_mutex
1215 dnl #
1216 AC_DEFUN([SPL_AC_INODE_I_MUTEX], [
1217         AC_MSG_CHECKING([whether struct inode has i_mutex])
1218         SPL_LINUX_TRY_COMPILE([
1219                 #include <linux/fs.h>
1220                 #include <linux/mutex.h>
1221         ],[
1222                 struct inode i;
1223                 mutex_init(&i.i_mutex);
1224         ],[
1225                 AC_MSG_RESULT(yes)
1226                 AC_DEFINE(HAVE_INODE_I_MUTEX, 1, [struct inode has i_mutex])
1227         ],[
1228                 AC_MSG_RESULT(no)
1229         ])
1230 ])
1231
1232 dnl #
1233 dnl # 2.6.29 API change,
1234 dnl # Adaptive mutexs introduced.
1235 dnl #
1236 AC_DEFUN([SPL_AC_MUTEX_OWNER], [
1237         AC_MSG_CHECKING([whether struct mutex has owner])
1238         SPL_LINUX_TRY_COMPILE([
1239                 #include <linux/mutex.h>
1240         ],[
1241                 struct mutex mtx __attribute__ ((unused));
1242                 mtx.owner = NULL;
1243         ],[
1244                 AC_MSG_RESULT(yes)
1245                 AC_DEFINE(HAVE_MUTEX_OWNER, 1, [struct mutex has owner])
1246         ],[
1247                 AC_MSG_RESULT(no)
1248         ])
1249 ])
1250
1251 dnl #
1252 dnl # 2.6.39 API change,
1253 dnl # Owner type change.  A Linux mutex prior to 2.6.39 would store
1254 dnl # the owner as a thread_info pointer when CONFIG_DEBUG_MUTEXES
1255 dnl # was defined.  As of 2.6.39 this was changed to a task_struct
1256 dnl # pointer which frankly makes a lot more sense.
1257 dnl #
1258 AC_DEFUN([SPL_AC_MUTEX_OWNER_TASK_STRUCT], [
1259         AC_MSG_CHECKING([whether struct mutex owner is a task_struct])
1260         tmp_flags="$EXTRA_KCFLAGS"
1261         EXTRA_KCFLAGS="-Werror"
1262         SPL_LINUX_TRY_COMPILE([
1263                 #include <linux/mutex.h>
1264                 #include <linux/sched.h>
1265         ],[
1266                 struct mutex mtx __attribute__ ((unused));
1267                 mtx.owner = current;
1268         ],[
1269                 AC_MSG_RESULT(yes)
1270                 AC_DEFINE(HAVE_MUTEX_OWNER_TASK_STRUCT, 1,
1271                 [struct mutex owner is a task_struct])
1272         ],[
1273                 AC_MSG_RESULT(no)
1274         ])
1275         EXTRA_KCFLAGS="$tmp_flags"
1276 ])
1277
1278 dnl #
1279 dnl # 2.6.18 API change,
1280 dnl # First introduced 'mutex_lock_nested()' in include/linux/mutex.h,
1281 dnl # as part of the mutex validator.  Fallback to using 'mutex_lock()'
1282 dnl # if the mutex validator is disabled or otherwise unavailable.
1283 dnl #
1284 AC_DEFUN([SPL_AC_MUTEX_LOCK_NESTED], [
1285         AC_MSG_CHECKING([whether mutex_lock_nested() is available])
1286         SPL_LINUX_TRY_COMPILE([
1287                 #include <linux/mutex.h>
1288         ],[
1289                 struct mutex mutex;
1290                 mutex_init(&mutex);
1291                 mutex_lock_nested(&mutex, 0);
1292         ],[
1293                 AC_MSG_RESULT(yes)
1294                 AC_DEFINE(HAVE_MUTEX_LOCK_NESTED, 1,
1295                 [mutex_lock_nested() is available])
1296         ],[
1297                 AC_MSG_RESULT(no)
1298         ])
1299 ])
1300
1301 dnl #
1302 dnl # 2.6.27 API change,
1303 dnl # on_each_cpu() uses 3 args, no 'retry' argument
1304 dnl #
1305 AC_DEFUN([SPL_AC_3ARGS_ON_EACH_CPU], [
1306         AC_MSG_CHECKING([whether on_each_cpu() wants 3 args])
1307         SPL_LINUX_TRY_COMPILE([
1308                 #include <linux/interrupt.h>
1309                 #include <linux/smp.h>
1310
1311                 void on_each_cpu_func(void *data) { return; }
1312         ],[
1313                 on_each_cpu(on_each_cpu_func, NULL, 0);
1314         ],[
1315                 AC_MSG_RESULT(yes)
1316                 AC_DEFINE(HAVE_3ARGS_ON_EACH_CPU, 1,
1317                           [on_each_cpu wants 3 args])
1318         ],[
1319                 AC_MSG_RESULT(no)
1320         ])
1321 ])
1322
1323 dnl #
1324 dnl # 2.6.18 API change,
1325 dnl # kallsyms_lookup_name no longer exported
1326 dnl #
1327 AC_DEFUN([SPL_AC_KALLSYMS_LOOKUP_NAME],
1328         [AC_MSG_CHECKING([whether kallsyms_lookup_name() is available])
1329         SPL_LINUX_TRY_COMPILE_SYMBOL([
1330                 #include <linux/kallsyms.h>
1331         ], [
1332                 kallsyms_lookup_name(NULL);
1333         ], [kallsyms_lookup_name], [], [
1334                 AC_MSG_RESULT(yes)
1335                 AC_DEFINE(HAVE_KALLSYMS_LOOKUP_NAME, 1,
1336                           [kallsyms_lookup_name() is available])
1337         ], [
1338                 AC_MSG_RESULT(no)
1339         ])
1340 ])
1341
1342 dnl #
1343 dnl # Proposed API change,
1344 dnl # This symbol is not available in stock kernels.  You may build a
1345 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1346 dnl # these symbols for use.  If your already rolling a custom kernel for
1347 dnl # your environment this is recommended.
1348 dnl #
1349 AC_DEFUN([SPL_AC_GET_VMALLOC_INFO],
1350         [AC_MSG_CHECKING([whether get_vmalloc_info() is available])
1351         SPL_CHECK_SYMBOL_EXPORT([get_vmalloc_info], [], [
1352                 AC_MSG_RESULT(yes)
1353                 AC_DEFINE(HAVE_GET_VMALLOC_INFO, 1,
1354                           [get_vmalloc_info() is available])
1355         ], [
1356                 AC_MSG_RESULT(no)
1357         ])
1358 ])
1359
1360 dnl #
1361 dnl # 2.6.17 API change
1362 dnl # The helper functions first_online_pgdat(), next_online_pgdat(), and
1363 dnl # next_zone() are introduced to simplify for_each_zone().  These symbols
1364 dnl # were exported in 2.6.17 for use by modules which was consistent with
1365 dnl # the previous implementation of for_each_zone().  From 2.6.18 - 2.6.19
1366 dnl # the symbols were exported as 'unused', and by 2.6.20 they exports
1367 dnl # were dropped entirely leaving modules no way to directly iterate over
1368 dnl # the zone list.  Because we need access to the zone helpers we check
1369 dnl # if the kernel contains the old or new implementation.  Then we check
1370 dnl # to see if the symbols we need for each version are available.  If they
1371 dnl # are not, dynamically aquire the addresses with kallsyms_lookup_name().
1372 dnl #
1373 AC_DEFUN([SPL_AC_PGDAT_HELPERS], [
1374         AC_MSG_CHECKING([whether symbol *_pgdat exist])
1375         grep -q -E 'first_online_pgdat' $LINUX/include/linux/mmzone.h 2>/dev/null
1376         rc=$?
1377         if test $rc -eq 0; then
1378                 AC_MSG_RESULT([yes])
1379                 AC_DEFINE(HAVE_PGDAT_HELPERS, 1, [pgdat helpers are available])
1380         else
1381                 AC_MSG_RESULT([no])
1382         fi
1383 ])
1384
1385 dnl #
1386 dnl # Proposed API change,
1387 dnl # This symbol is not available in stock kernels.  You may build a
1388 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1389 dnl # these symbols for use.  If your already rolling a custom kernel for
1390 dnl # your environment this is recommended.
1391 dnl #
1392 AC_DEFUN([SPL_AC_FIRST_ONLINE_PGDAT],
1393         [AC_MSG_CHECKING([whether first_online_pgdat() is available])
1394         SPL_LINUX_TRY_COMPILE_SYMBOL([
1395                 #include <linux/mmzone.h>
1396         ], [
1397                 first_online_pgdat();
1398         ], [first_online_pgdat], [], [
1399                 AC_MSG_RESULT(yes)
1400                 AC_DEFINE(HAVE_FIRST_ONLINE_PGDAT, 1,
1401                           [first_online_pgdat() is available])
1402         ], [
1403                 AC_MSG_RESULT(no)
1404         ])
1405 ])
1406
1407 dnl #
1408 dnl # Proposed API change,
1409 dnl # This symbol is not available in stock kernels.  You may build a
1410 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1411 dnl # these symbols for use.  If your already rolling a custom kernel for
1412 dnl # your environment this is recommended.
1413 dnl #
1414 AC_DEFUN([SPL_AC_NEXT_ONLINE_PGDAT],
1415         [AC_MSG_CHECKING([whether next_online_pgdat() is available])
1416         SPL_LINUX_TRY_COMPILE_SYMBOL([
1417                 #include <linux/mmzone.h>
1418         ], [
1419                 next_online_pgdat(NULL);
1420         ], [next_online_pgdat], [], [
1421                 AC_MSG_RESULT(yes)
1422                 AC_DEFINE(HAVE_NEXT_ONLINE_PGDAT, 1,
1423                           [next_online_pgdat() is available])
1424         ], [
1425                 AC_MSG_RESULT(no)
1426         ])
1427 ])
1428
1429 dnl #
1430 dnl # Proposed API change,
1431 dnl # This symbol is not available in stock kernels.  You may build a
1432 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1433 dnl # these symbols for use.  If your already rolling a custom kernel for
1434 dnl # your environment this is recommended.
1435 dnl #
1436 AC_DEFUN([SPL_AC_NEXT_ZONE],
1437         [AC_MSG_CHECKING([whether next_zone() is available])
1438         SPL_LINUX_TRY_COMPILE_SYMBOL([
1439                 #include <linux/mmzone.h>
1440         ], [
1441                 next_zone(NULL);
1442         ], [next_zone], [], [
1443                 AC_MSG_RESULT(yes)
1444                 AC_DEFINE(HAVE_NEXT_ZONE, 1, [next_zone() is available])
1445         ], [
1446                 AC_MSG_RESULT(no)
1447         ])
1448 ])
1449
1450 dnl #
1451 dnl # 2.6.17 API change,
1452 dnl # See SPL_AC_PGDAT_HELPERS for details.
1453 dnl #
1454 AC_DEFUN([SPL_AC_PGDAT_LIST],
1455         [AC_MSG_CHECKING([whether pgdat_list is available])
1456         SPL_LINUX_TRY_COMPILE_SYMBOL([
1457                 #include <linux/topology.h>
1458                 pg_data_t *tmp = pgdat_list;
1459         ], [], [pgdat_list], [], [
1460                 AC_MSG_RESULT(yes)
1461                 AC_DEFINE(HAVE_PGDAT_LIST, 1, [pgdat_list is available])
1462         ], [
1463                 AC_MSG_RESULT(no)
1464         ])
1465 ])
1466
1467 dnl #
1468 dnl # 2.6.18 API change,
1469 dnl # First introduced global_page_state() support as an inline.
1470 dnl #
1471 AC_DEFUN([SPL_AC_GLOBAL_PAGE_STATE], [
1472         AC_MSG_CHECKING([whether global_page_state() is available])
1473         SPL_LINUX_TRY_COMPILE([
1474                 #include <linux/mm.h>
1475         ],[
1476                 unsigned long state __attribute__ ((unused));
1477                 state = global_page_state(0);
1478         ],[
1479                 AC_MSG_RESULT(yes)
1480                 AC_DEFINE(HAVE_GLOBAL_PAGE_STATE, 1,
1481                           [global_page_state() is available])
1482         ],[
1483                 AC_MSG_RESULT(no)
1484         ])
1485 ])
1486
1487 dnl #
1488 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1489 dnl # Public global zone stats now include a free page count.  However
1490 dnl # the enumerated names of the counters have changed since this API
1491 dnl # was introduced.  We need to deduce the corrent name to use.  This
1492 dnl # replaces the priviate get_zone_counts() interface.
1493 dnl #
1494 dnl # NR_FREE_PAGES was available from 2.6.21 to current kernels, which
1495 dnl # is 2.6.30 as of when this was written.
1496 dnl #
1497 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_FREE], [
1498         AC_MSG_CHECKING([whether page state NR_FREE_PAGES is available])
1499         SPL_LINUX_TRY_COMPILE([
1500                 #include <linux/mm.h>
1501         ],[
1502                 enum zone_stat_item zsi __attribute__ ((unused));
1503                 zsi = NR_FREE_PAGES;
1504         ],[
1505                 AC_MSG_RESULT(yes)
1506                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES, 1,
1507                           [Page state NR_FREE_PAGES is available])
1508         ],[
1509                 AC_MSG_RESULT(no)
1510         ])
1511 ])
1512
1513 dnl #
1514 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1515 dnl # Public global zone stats now include an inactive page count.  However
1516 dnl # the enumerated names of the counters have changed since this API
1517 dnl # was introduced.  We need to deduce the corrent name to use.  This
1518 dnl # replaces the priviate get_zone_counts() interface.
1519 dnl #
1520 dnl # NR_INACTIVE was available from 2.6.21 to 2.6.27 and included both
1521 dnl # anonymous and file inactive pages.  As of 2.6.28 it was split in
1522 dnl # to NR_INACTIVE_ANON and NR_INACTIVE_FILE.
1523 dnl #
1524 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_INACTIVE], [
1525         AC_MSG_CHECKING([whether page state NR_INACTIVE is available])
1526         SPL_LINUX_TRY_COMPILE([
1527                 #include <linux/mm.h>
1528         ],[
1529                 enum zone_stat_item zsi __attribute__ ((unused));
1530                 zsi = NR_INACTIVE;
1531         ],[
1532                 AC_MSG_RESULT(yes)
1533                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE, 1,
1534                           [Page state NR_INACTIVE is available])
1535         ],[
1536                 AC_MSG_RESULT(no)
1537         ])
1538
1539         AC_MSG_CHECKING([whether page state NR_INACTIVE_ANON is available])
1540         SPL_LINUX_TRY_COMPILE([
1541                 #include <linux/mm.h>
1542         ],[
1543                 enum zone_stat_item zsi __attribute__ ((unused));
1544                 zsi = NR_INACTIVE_ANON;
1545         ],[
1546                 AC_MSG_RESULT(yes)
1547                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON, 1,
1548                           [Page state NR_INACTIVE_ANON is available])
1549         ],[
1550                 AC_MSG_RESULT(no)
1551         ])
1552
1553         AC_MSG_CHECKING([whether page state NR_INACTIVE_FILE is available])
1554         SPL_LINUX_TRY_COMPILE([
1555                 #include <linux/mm.h>
1556         ],[
1557                 enum zone_stat_item zsi __attribute__ ((unused));
1558                 zsi = NR_INACTIVE_FILE;
1559         ],[
1560                 AC_MSG_RESULT(yes)
1561                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE, 1,
1562                           [Page state NR_INACTIVE_FILE is available])
1563         ],[
1564                 AC_MSG_RESULT(no)
1565         ])
1566 ])
1567
1568 dnl #
1569 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1570 dnl # Public global zone stats now include an active page count.  However
1571 dnl # the enumerated names of the counters have changed since this API
1572 dnl # was introduced.  We need to deduce the corrent name to use.  This
1573 dnl # replaces the priviate get_zone_counts() interface.
1574 dnl #
1575 dnl # NR_ACTIVE was available from 2.6.21 to 2.6.27 and included both
1576 dnl # anonymous and file active pages.  As of 2.6.28 it was split in
1577 dnl # to NR_ACTIVE_ANON and NR_ACTIVE_FILE.
1578 dnl #
1579 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_ACTIVE], [
1580         AC_MSG_CHECKING([whether page state NR_ACTIVE is available])
1581         SPL_LINUX_TRY_COMPILE([
1582                 #include <linux/mm.h>
1583         ],[
1584                 enum zone_stat_item zsi __attribute__ ((unused));
1585                 zsi = NR_ACTIVE;
1586         ],[
1587                 AC_MSG_RESULT(yes)
1588                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE, 1,
1589                           [Page state NR_ACTIVE is available])
1590         ],[
1591                 AC_MSG_RESULT(no)
1592         ])
1593
1594         AC_MSG_CHECKING([whether page state NR_ACTIVE_ANON is available])
1595         SPL_LINUX_TRY_COMPILE([
1596                 #include <linux/mm.h>
1597         ],[
1598                 enum zone_stat_item zsi __attribute__ ((unused));
1599                 zsi = NR_ACTIVE_ANON;
1600         ],[
1601                 AC_MSG_RESULT(yes)
1602                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON, 1,
1603                           [Page state NR_ACTIVE_ANON is available])
1604         ],[
1605                 AC_MSG_RESULT(no)
1606         ])
1607
1608         AC_MSG_CHECKING([whether page state NR_ACTIVE_FILE is available])
1609         SPL_LINUX_TRY_COMPILE([
1610                 #include <linux/mm.h>
1611         ],[
1612                 enum zone_stat_item zsi __attribute__ ((unused));
1613                 zsi = NR_ACTIVE_FILE;
1614         ],[
1615                 AC_MSG_RESULT(yes)
1616                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE, 1,
1617                           [Page state NR_ACTIVE_FILE is available])
1618         ],[
1619                 AC_MSG_RESULT(no)
1620         ])
1621 ])
1622
1623 dnl #
1624 dnl # Proposed API change for legacy kernels.
1625 dnl # This symbol is not available in older kernels.  For kernels post
1626 dnl # 2.6.21 the global_page_state() API is used to get free/inactive/active
1627 dnl # page state information.  This symbol is only used in legacy kernels
1628 dnl # any only as a last resort.
1629 dnl
1630 AC_DEFUN([SPL_AC_GET_ZONE_COUNTS], [
1631         AC_MSG_CHECKING([whether symbol get_zone_counts is needed])
1632         SPL_LINUX_TRY_COMPILE([
1633         ],[
1634                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES)
1635                 #error "global_page_state needs NR_FREE_PAGES"
1636                 #endif
1637
1638                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE) && \
1639                     !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON) && \
1640                     !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE)
1641                 #error "global_page_state needs NR_ACTIVE*"
1642                 #endif
1643
1644                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE) && \
1645                     !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON) && \
1646                     !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE)
1647                 #error "global_page_state needs NR_INACTIVE*"
1648                 #endif
1649         ],[
1650                 AC_MSG_RESULT(no)
1651         ],[
1652                 AC_MSG_RESULT(yes)
1653                 AC_DEFINE(NEED_GET_ZONE_COUNTS, 1,
1654                           [get_zone_counts() is needed])
1655
1656                 AC_MSG_CHECKING([whether get_zone_counts() is available])
1657                 SPL_LINUX_TRY_COMPILE_SYMBOL([
1658                         #include <linux/mmzone.h>
1659                 ], [
1660                         get_zone_counts(NULL, NULL, NULL);
1661                 ], [get_zone_counts], [], [
1662                         AC_MSG_RESULT(yes)
1663                         AC_DEFINE(HAVE_GET_ZONE_COUNTS, 1,
1664                                   [get_zone_counts() is available])
1665                 ], [
1666                         AC_MSG_RESULT(no)
1667                 ])
1668         ])
1669 ])
1670
1671 dnl #
1672 dnl # 2.6.27 API change,
1673 dnl # The user_path_dir() replaces __user_walk()
1674 dnl #
1675 AC_DEFUN([SPL_AC_USER_PATH_DIR],
1676         [AC_MSG_CHECKING([whether user_path_dir() is available])
1677         SPL_LINUX_TRY_COMPILE_SYMBOL([
1678                 #include <linux/fcntl.h>
1679                 #include <linux/namei.h>
1680         ], [
1681                 user_path_dir(NULL, NULL);
1682         ], [user_path_at], [], [
1683                 AC_MSG_RESULT(yes)
1684                 AC_DEFINE(HAVE_USER_PATH_DIR, 1, [user_path_dir() is available])
1685         ], [
1686                 AC_MSG_RESULT(no)
1687         ])
1688 ])
1689
1690 dnl #
1691 dnl # Symbol available in RHEL kernels not in stock kernels.
1692 dnl #
1693 AC_DEFUN([SPL_AC_SET_FS_PWD],
1694         [AC_MSG_CHECKING([whether set_fs_pwd() is available])
1695         SPL_LINUX_TRY_COMPILE_SYMBOL([
1696                 #include <linux/spinlock.h>
1697                 #include <linux/fs_struct.h>
1698         ], [
1699                 (void) set_fs_pwd;
1700         ], [set_fs_pwd], [], [
1701                 AC_MSG_RESULT(yes)
1702                 AC_DEFINE(HAVE_SET_FS_PWD, 1, [set_fs_pwd() is available])
1703         ], [
1704                 AC_MSG_RESULT(no)
1705         ])
1706 ])
1707
1708 dnl #
1709 dnl # 3.9 API change
1710 dnl # set_fs_pwd takes const struct path *
1711 dnl #
1712 AC_DEFUN([SPL_AC_SET_FS_PWD_WITH_CONST],
1713         tmp_flags="$EXTRA_KCFLAGS"
1714         EXTRA_KCFLAGS="-Werror"
1715         [AC_MSG_CHECKING([whether set_fs_pwd() requires const struct path *])
1716         SPL_LINUX_TRY_COMPILE([
1717                 #include <linux/spinlock.h>
1718                 #include <linux/fs_struct.h>
1719                 #include <linux/path.h>
1720                 void (*const set_fs_pwd_func)
1721                         (struct fs_struct *, const struct path *)
1722                         = set_fs_pwd;
1723         ],[
1724                 return 0;
1725         ],[
1726                 AC_MSG_RESULT(yes)
1727                 AC_DEFINE(HAVE_SET_FS_PWD_WITH_CONST, 1,
1728                         [set_fs_pwd() needs const path *])
1729         ],[
1730                 SPL_LINUX_TRY_COMPILE([
1731                         #include <linux/spinlock.h>
1732                         #include <linux/fs_struct.h>
1733                         #include <linux/path.h>
1734                         void (*const set_fs_pwd_func)
1735                                 (struct fs_struct *, struct path *)
1736                                 = set_fs_pwd;
1737                 ],[
1738                         return 0;
1739                 ],[
1740                         AC_MSG_RESULT(no)
1741                 ],[
1742                         AC_MSG_ERROR(unknown)
1743                 ])
1744         ])
1745         EXTRA_KCFLAGS="$tmp_flags"
1746 ])
1747
1748 dnl #
1749 dnl # SLES API change, never adopted in mainline,
1750 dnl # Third 'struct vfsmount *' argument removed.
1751 dnl #
1752 AC_DEFUN([SPL_AC_2ARGS_VFS_UNLINK],
1753         [AC_MSG_CHECKING([whether vfs_unlink() wants 2 args])
1754         SPL_LINUX_TRY_COMPILE([
1755                 #include <linux/fs.h>
1756         ],[
1757                 vfs_unlink(NULL, NULL);
1758         ],[
1759                 AC_MSG_RESULT(yes)
1760                 AC_DEFINE(HAVE_2ARGS_VFS_UNLINK, 1,
1761                           [vfs_unlink() wants 2 args])
1762         ],[
1763                 AC_MSG_RESULT(no)
1764         ])
1765 ])
1766
1767 dnl #
1768 dnl # SLES API change, never adopted in mainline,
1769 dnl # Third and sixth 'struct vfsmount *' argument removed.
1770 dnl #
1771 AC_DEFUN([SPL_AC_4ARGS_VFS_RENAME],
1772         [AC_MSG_CHECKING([whether vfs_rename() wants 4 args])
1773         SPL_LINUX_TRY_COMPILE([
1774                 #include <linux/fs.h>
1775         ],[
1776                 vfs_rename(NULL, NULL, NULL, NULL);
1777         ],[
1778                 AC_MSG_RESULT(yes)
1779                 AC_DEFINE(HAVE_4ARGS_VFS_RENAME, 1,
1780                           [vfs_rename() wants 4 args])
1781         ],[
1782                 AC_MSG_RESULT(no)
1783         ])
1784 ])
1785
1786 dnl #
1787 dnl # 2.6.36 API change,
1788 dnl # The 'struct fs_struct->lock' was changed from a rwlock_t to
1789 dnl # a spinlock_t to improve the fastpath performance.
1790 dnl #
1791 AC_DEFUN([SPL_AC_FS_STRUCT_SPINLOCK], [
1792         AC_MSG_CHECKING([whether struct fs_struct uses spinlock_t])
1793         tmp_flags="$EXTRA_KCFLAGS"
1794         EXTRA_KCFLAGS="-Werror"
1795         SPL_LINUX_TRY_COMPILE([
1796                 #include <linux/sched.h>
1797                 #include <linux/fs_struct.h>
1798         ],[
1799                 struct fs_struct fs;
1800                 spin_lock_init(&fs.lock);
1801         ],[
1802                 AC_MSG_RESULT(yes)
1803                 AC_DEFINE(HAVE_FS_STRUCT_SPINLOCK, 1,
1804                           [struct fs_struct uses spinlock_t])
1805         ],[
1806                 AC_MSG_RESULT(no)
1807         ])
1808         EXTRA_KCFLAGS="$tmp_flags"
1809 ])
1810
1811 dnl #
1812 dnl # 2.6.29 API change,
1813 dnl # check whether 'struct cred' exists
1814 dnl #
1815 AC_DEFUN([SPL_AC_CRED_STRUCT], [
1816         AC_MSG_CHECKING([whether struct cred exists])
1817         SPL_LINUX_TRY_COMPILE([
1818                 #include <linux/cred.h>
1819         ],[
1820                 struct cred *cr __attribute__ ((unused));
1821                 cr  = NULL;
1822         ],[
1823                 AC_MSG_RESULT(yes)
1824                 AC_DEFINE(HAVE_CRED_STRUCT, 1, [struct cred exists])
1825         ],[
1826                 AC_MSG_RESULT(no)
1827         ])
1828 ])
1829
1830 dnl #
1831 dnl # Custom SPL patch may export this symbol.
1832 dnl #
1833 AC_DEFUN([SPL_AC_GROUPS_SEARCH],
1834         [AC_MSG_CHECKING([whether groups_search() is available])
1835         SPL_LINUX_TRY_COMPILE_SYMBOL([
1836                 #include <linux/cred.h>
1837         ], [
1838                 groups_search(NULL, 0);
1839         ], [groups_search], [], [
1840                 AC_MSG_RESULT(yes)
1841                 AC_DEFINE(HAVE_GROUPS_SEARCH, 1, [groups_search() is available])
1842         ], [
1843                 AC_MSG_RESULT(no)
1844         ])
1845 ])
1846
1847 dnl #
1848 dnl # 2.6.x API change,
1849 dnl # __put_task_struct() was exported in RHEL5 but unavailable elsewhere.
1850 dnl #
1851 AC_DEFUN([SPL_AC_PUT_TASK_STRUCT],
1852         [AC_MSG_CHECKING([whether __put_task_struct() is available])
1853         SPL_LINUX_TRY_COMPILE_SYMBOL([
1854                 #include <linux/sched.h>
1855         ], [
1856                 __put_task_struct(NULL);
1857         ], [__put_task_struct], [], [
1858                 AC_MSG_RESULT(yes)
1859                 AC_DEFINE(HAVE_PUT_TASK_STRUCT, 1,
1860                           [__put_task_struct() is available])
1861         ], [
1862                 AC_MSG_RESULT(no)
1863         ])
1864 ])
1865
1866 dnl #
1867 dnl # 2.6.32 API change,
1868 dnl # Unused 'struct file *' removed from prototype.
1869 dnl #
1870 AC_DEFUN([SPL_AC_5ARGS_PROC_HANDLER], [
1871         AC_MSG_CHECKING([whether proc_handler() wants 5 args])
1872         SPL_LINUX_TRY_COMPILE([
1873                 #include <linux/sysctl.h>
1874         ],[
1875                 proc_dostring(NULL, 0, NULL, NULL, NULL);
1876         ],[
1877                 AC_MSG_RESULT(yes)
1878                 AC_DEFINE(HAVE_5ARGS_PROC_HANDLER, 1,
1879                           [proc_handler() wants 5 args])
1880         ],[
1881                 AC_MSG_RESULT(no)
1882         ])
1883 ])
1884
1885 dnl #
1886 dnl # 2.6.x API change,
1887 dnl # kvasprintf() function added.
1888 dnl #
1889 AC_DEFUN([SPL_AC_KVASPRINTF],
1890         [AC_MSG_CHECKING([whether kvasprintf() is available])
1891         SPL_LINUX_TRY_COMPILE_SYMBOL([
1892                 #include <linux/kernel.h>
1893         ], [
1894                 kvasprintf(0, NULL, *((va_list*)NULL));
1895         ], [kvasprintf], [], [
1896                 AC_MSG_RESULT(yes)
1897                 AC_DEFINE(HAVE_KVASPRINTF, 1, [kvasprintf() is available])
1898         ], [
1899                 AC_MSG_RESULT(no)
1900         ])
1901 ])
1902
1903 dnl #
1904 dnl # 2.6.29 API change,
1905 dnl # vfs_fsync() funcation added, prior to this use file_fsync().
1906 dnl #
1907 AC_DEFUN([SPL_AC_VFS_FSYNC],
1908         [AC_MSG_CHECKING([whether vfs_fsync() is available])
1909         SPL_LINUX_TRY_COMPILE_SYMBOL([
1910                 #include <linux/fs.h>
1911         ], [
1912                 (void) vfs_fsync;
1913         ], [vfs_fsync], [fs/sync.c], [
1914                 AC_MSG_RESULT(yes)
1915                 AC_DEFINE(HAVE_VFS_FSYNC, 1, [vfs_fsync() is available])
1916         ], [
1917                 AC_MSG_RESULT(no)
1918         ])
1919 ])
1920
1921 dnl #
1922 dnl # 2.6.35 API change,
1923 dnl # Unused 'struct dentry *' removed from vfs_fsync() prototype.
1924 dnl #
1925 AC_DEFUN([SPL_AC_2ARGS_VFS_FSYNC], [
1926         AC_MSG_CHECKING([whether vfs_fsync() wants 2 args])
1927         SPL_LINUX_TRY_COMPILE([
1928                 #include <linux/fs.h>
1929         ],[
1930                 vfs_fsync(NULL, 0);
1931         ],[
1932                 AC_MSG_RESULT(yes)
1933                 AC_DEFINE(HAVE_2ARGS_VFS_FSYNC, 1, [vfs_fsync() wants 2 args])
1934         ],[
1935                 AC_MSG_RESULT(no)
1936         ])
1937 ])
1938
1939 dnl #
1940 dnl # 3.5 API change,
1941 dnl # inode_operations.truncate_range removed
1942 dnl #
1943 AC_DEFUN([SPL_AC_INODE_TRUNCATE_RANGE], [
1944         AC_MSG_CHECKING([whether truncate_range() inode operation is available])
1945         SPL_LINUX_TRY_COMPILE([
1946                 #include <linux/fs.h>
1947         ],[
1948                 struct inode_operations ops;
1949                 ops.truncate_range = NULL;
1950         ],[
1951                 AC_MSG_RESULT(yes)
1952                 AC_DEFINE(HAVE_INODE_TRUNCATE_RANGE, 1,
1953                         [truncate_range() inode operation is available])
1954         ],[
1955                 AC_MSG_RESULT(no)
1956         ])
1957 ])
1958
1959 dnl #
1960 dnl # Linux 2.6.38 - 3.x API
1961 dnl #
1962 AC_DEFUN([SPL_AC_KERNEL_FILE_FALLOCATE], [
1963         AC_MSG_CHECKING([whether fops->fallocate() exists])
1964         SPL_LINUX_TRY_COMPILE([
1965                 #include <linux/fs.h>
1966         ],[
1967                 long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL;
1968                 struct file_operations fops __attribute__ ((unused)) = {
1969                         .fallocate = fallocate,
1970                 };
1971         ],[
1972                 AC_MSG_RESULT(yes)
1973                 AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists])
1974         ],[
1975                 AC_MSG_RESULT(no)
1976         ])
1977 ])
1978
1979 dnl #
1980 dnl # Linux 2.6.x - 2.6.37 API
1981 dnl #
1982 AC_DEFUN([SPL_AC_KERNEL_INODE_FALLOCATE], [
1983         AC_MSG_CHECKING([whether iops->fallocate() exists])
1984         SPL_LINUX_TRY_COMPILE([
1985                 #include <linux/fs.h>
1986         ],[
1987                 long (*fallocate) (struct inode *, int, loff_t, loff_t) = NULL;
1988                 struct inode_operations fops __attribute__ ((unused)) = {
1989                         .fallocate = fallocate,
1990                 };
1991         ],[
1992                 AC_MSG_RESULT(yes)
1993                 AC_DEFINE(HAVE_INODE_FALLOCATE, 1, [fops->fallocate() exists])
1994         ],[
1995                 AC_MSG_RESULT(no)
1996         ])
1997 ])
1998
1999 dnl #
2000 dnl # PaX Linux 2.6.38 - 3.x API
2001 dnl #
2002 AC_DEFUN([SPL_AC_PAX_KERNEL_FILE_FALLOCATE], [
2003         AC_MSG_CHECKING([whether fops->fallocate() exists])
2004         SPL_LINUX_TRY_COMPILE([
2005                 #include <linux/fs.h>
2006         ],[
2007                 long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL;
2008                 struct file_operations_no_const fops __attribute__ ((unused)) = {
2009                         .fallocate = fallocate,
2010                 };
2011         ],[
2012                 AC_MSG_RESULT(yes)
2013                 AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists])
2014         ],[
2015                 AC_MSG_RESULT(no)
2016         ])
2017 ])
2018
2019 dnl #
2020 dnl # The fallocate callback was moved from the inode_operations
2021 dnl # structure to the file_operations structure.
2022 dnl #
2023 AC_DEFUN([SPL_AC_KERNEL_FALLOCATE], [
2024         SPL_AC_KERNEL_FILE_FALLOCATE
2025         SPL_AC_KERNEL_INODE_FALLOCATE
2026         SPL_AC_PAX_KERNEL_FILE_FALLOCATE
2027 ])
2028
2029 dnl #
2030 dnl # 2.6.33 API change. Also backported in RHEL5 as of 2.6.18-190.el5.
2031 dnl # Earlier versions of rwsem_is_locked() were inline and had a race
2032 dnl # condition.  The fixed version is exported as a symbol.  The race
2033 dnl # condition is fixed by acquiring sem->wait_lock, so we must not
2034 dnl # call that version while holding sem->wait_lock.
2035 dnl #
2036 AC_DEFUN([SPL_AC_EXPORTED_RWSEM_IS_LOCKED],
2037         [AC_MSG_CHECKING([whether rwsem_is_locked() acquires sem->wait_lock])
2038         SPL_LINUX_TRY_COMPILE_SYMBOL([
2039                 #include <linux/rwsem.h>
2040                 int rwsem_is_locked(struct rw_semaphore *sem) { return 0; }
2041         ], [], [rwsem_is_locked], [lib/rwsem-spinlock.c], [
2042                 AC_MSG_RESULT(yes)
2043                 AC_DEFINE(RWSEM_IS_LOCKED_TAKES_WAIT_LOCK, 1,
2044                           [rwsem_is_locked() acquires sem->wait_lock])
2045         ], [
2046                 AC_MSG_RESULT(no)
2047         ])
2048 ])
2049
2050 dnl #
2051 dnl # 2.6.xx API compat,
2052 dnl # There currently exists no exposed API to partially shrink the dcache.
2053 dnl # The expected mechanism to shrink the cache is a registered shrinker
2054 dnl # which is called during memory pressure.
2055 dnl #
2056 AC_DEFUN([SPL_AC_SHRINK_DCACHE_MEMORY],
2057         [AC_MSG_CHECKING([whether shrink_dcache_memory() is available])
2058         SPL_LINUX_TRY_COMPILE_SYMBOL([
2059                 #include <linux/dcache.h>
2060         ], [
2061                 shrink_dcache_memory(0, 0);
2062         ], [shrink_dcache_memory], [fs/dcache.c], [
2063                 AC_MSG_RESULT(yes)
2064                 AC_DEFINE(HAVE_SHRINK_DCACHE_MEMORY, 1,
2065                           [shrink_dcache_memory() is available])
2066         ], [
2067                 AC_MSG_RESULT(no)
2068         ])
2069 ])
2070
2071 dnl #
2072 dnl # 2.6.xx API compat,
2073 dnl # There currently exists no exposed API to partially shrink the icache.
2074 dnl # The expected mechanism to shrink the cache is a registered shrinker
2075 dnl # which is called during memory pressure.
2076 dnl #
2077 AC_DEFUN([SPL_AC_SHRINK_ICACHE_MEMORY],
2078         [AC_MSG_CHECKING([whether shrink_icache_memory() is available])
2079         SPL_LINUX_TRY_COMPILE_SYMBOL([
2080                 #include <linux/dcache.h>
2081         ], [
2082                 shrink_icache_memory(0, 0);
2083         ], [shrink_icache_memory], [fs/inode.c], [
2084                 AC_MSG_RESULT(yes)
2085                 AC_DEFINE(HAVE_SHRINK_ICACHE_MEMORY, 1,
2086                           [shrink_icache_memory() is available])
2087         ], [
2088                 AC_MSG_RESULT(no)
2089         ])
2090 ])
2091
2092 dnl #
2093 dnl # 2.6.39 API compat,
2094 dnl # The path_lookup() function has been renamed to kern_path_parent()
2095 dnl # and the flags argument has been removed.  The only behavior now
2096 dnl # offered is that of LOOKUP_PARENT.  The spl already always passed
2097 dnl # this flag so dropping the flag does not impact us.
2098 dnl #
2099 AC_DEFUN([SPL_AC_KERN_PATH_PARENT_HEADER], [
2100         SPL_CHECK_SYMBOL_HEADER(
2101                 [kern_path_parent],
2102                 [int kern_path_parent(const char \*, struct nameidata \*)],
2103                 [include/linux/namei.h],
2104                 [AC_DEFINE(HAVE_KERN_PATH_PARENT_HEADER, 1,
2105                 [kern_path_parent() is available])],
2106                 [])
2107 ])
2108
2109 dnl #
2110 dnl # 3.1 API compat,
2111 dnl # The kern_path_parent() symbol is no longer exported by the kernel.
2112 dnl # However, it remains the prefered interface and since we still have
2113 dnl # access to the prototype we dynamically lookup the required address.
2114 dnl #
2115 AC_DEFUN([SPL_AC_KERN_PATH_PARENT_SYMBOL],
2116         [AC_MSG_CHECKING([whether kern_path_parent() is available])
2117         SPL_LINUX_TRY_COMPILE_SYMBOL([
2118                 #include <linux/namei.h>
2119         ], [
2120                 kern_path_parent(NULL, NULL);
2121         ], [kern_path_parent], [fs/namei.c], [
2122                 AC_MSG_RESULT(yes)
2123                 AC_DEFINE(HAVE_KERN_PATH_PARENT_SYMBOL, 1,
2124                           [kern_path_parent() is available])
2125         ], [
2126                 AC_MSG_RESULT(no)
2127         ])
2128 ])
2129
2130 dnl #
2131 dnl # 3.6 API compat,
2132 dnl # The kern_path_parent() function was replaced by the kern_path_locked()
2133 dnl # function to eliminate all struct nameidata usage outside fs/namei.c.
2134 dnl #
2135 AC_DEFUN([SPL_AC_KERN_PATH_LOCKED], [
2136         SPL_CHECK_SYMBOL_HEADER(
2137                 [kern_path_locked],
2138                 [struct dentry \*kern_path_locked(const char \*, struct path \*)],
2139                 [include/linux/namei.h],
2140                 [AC_DEFINE(HAVE_KERN_PATH_LOCKED, 1,
2141                 [kern_path_locked() is available])],
2142                 [])
2143 ])
2144
2145 dnl #
2146 dnl # /proc/kallsyms support,
2147 dnl # Verify the kernel has CONFIG_KALLSYMS support enabled.
2148 dnl #
2149 AC_DEFUN([SPL_AC_CONFIG_KALLSYMS], [
2150         AC_MSG_CHECKING([whether CONFIG_KALLSYMS is defined])
2151         SPL_LINUX_TRY_COMPILE([
2152                 #if !defined(CONFIG_KALLSYMS)
2153                 #error CONFIG_KALLSYMS not defined
2154                 #endif
2155         ],[ ],[
2156                 AC_MSG_RESULT([yes])
2157         ],[
2158                 AC_MSG_RESULT([no])
2159                 AC_MSG_ERROR([
2160         *** This kernel does not include the required kallsyms support.
2161         *** Rebuild the kernel with CONFIG_KALLSYMS=y set.])
2162         ])
2163 ])
2164
2165 dnl #
2166 dnl # zlib inflate compat,
2167 dnl # Verify the kernel has CONFIG_ZLIB_INFLATE support enabled.
2168 dnl #
2169 AC_DEFUN([SPL_AC_CONFIG_ZLIB_INFLATE], [
2170         AC_MSG_CHECKING([whether CONFIG_ZLIB_INFLATE is defined])
2171         SPL_LINUX_TRY_COMPILE([
2172                 #if !defined(CONFIG_ZLIB_INFLATE) && \
2173                     !defined(CONFIG_ZLIB_INFLATE_MODULE)
2174                 #error CONFIG_ZLIB_INFLATE not defined
2175                 #endif
2176         ],[ ],[
2177                 AC_MSG_RESULT([yes])
2178         ],[
2179                 AC_MSG_RESULT([no])
2180                 AC_MSG_ERROR([
2181         *** This kernel does not include the required zlib inflate support.
2182         *** Rebuild the kernel with CONFIG_ZLIB_INFLATE=y|m set.])
2183         ])
2184 ])
2185
2186 dnl #
2187 dnl # zlib deflate compat,
2188 dnl # Verify the kernel has CONFIG_ZLIB_DEFLATE support enabled.
2189 dnl #
2190 AC_DEFUN([SPL_AC_CONFIG_ZLIB_DEFLATE], [
2191         AC_MSG_CHECKING([whether CONFIG_ZLIB_DEFLATE is defined])
2192         SPL_LINUX_TRY_COMPILE([
2193                 #if !defined(CONFIG_ZLIB_DEFLATE) && \
2194                     !defined(CONFIG_ZLIB_DEFLATE_MODULE)
2195                 #error CONFIG_ZLIB_DEFLATE not defined
2196                 #endif
2197         ],[ ],[
2198                 AC_MSG_RESULT([yes])
2199         ],[
2200                 AC_MSG_RESULT([no])
2201                 AC_MSG_ERROR([
2202         *** This kernel does not include the required zlib deflate support.
2203         *** Rebuild the kernel with CONFIG_ZLIB_DEFLATE=y|m set.])
2204         ])
2205 ])
2206
2207 dnl #
2208 dnl # 2.6.39 API compat,
2209 dnl # The function zlib_deflate_workspacesize() now take 2 arguments.
2210 dnl # This was done to avoid always having to allocate the maximum size
2211 dnl # workspace (268K).  The caller can now specific the windowBits and
2212 dnl # memLevel compression parameters to get a smaller workspace.
2213 dnl #
2214 AC_DEFUN([SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE],
2215         [AC_MSG_CHECKING([whether zlib_deflate_workspacesize() wants 2 args])
2216         SPL_LINUX_TRY_COMPILE([
2217                 #include <linux/zlib.h>
2218         ],[
2219                 return zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL);
2220         ],[
2221                 AC_MSG_RESULT(yes)
2222                 AC_DEFINE(HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE, 1,
2223                           [zlib_deflate_workspacesize() wants 2 args])
2224         ],[
2225                 AC_MSG_RESULT(no)
2226         ])
2227 ])
2228
2229 dnl #
2230 dnl # 2.6.39 API change,
2231 dnl # Shrinker adjust to use common shrink_control structure.
2232 dnl #
2233 AC_DEFUN([SPL_AC_SHRINK_CONTROL_STRUCT], [
2234         AC_MSG_CHECKING([whether struct shrink_control exists])
2235         SPL_LINUX_TRY_COMPILE([
2236                 #include <linux/mm.h>
2237         ],[
2238                 struct shrink_control sc __attribute__ ((unused));
2239
2240                 sc.nr_to_scan = 0;
2241                 sc.gfp_mask = GFP_KERNEL;
2242         ],[
2243                 AC_MSG_RESULT(yes)
2244                 AC_DEFINE(HAVE_SHRINK_CONTROL_STRUCT, 1,
2245                         [struct shrink_control exists])
2246         ],[
2247                 AC_MSG_RESULT(no)
2248         ])
2249 ])
2250
2251 dnl #
2252 dnl # 3.1 API Change
2253 dnl #
2254 dnl # The rw_semaphore.wait_lock member was changed from spinlock_t to
2255 dnl # raw_spinlock_t at commit ddb6c9b58a19edcfac93ac670b066c836ff729f1.
2256 dnl #
2257 AC_DEFUN([SPL_AC_RWSEM_SPINLOCK_IS_RAW], [
2258         AC_MSG_CHECKING([whether struct rw_semaphore member wait_lock is raw])
2259         tmp_flags="$EXTRA_KCFLAGS"
2260         EXTRA_KCFLAGS="-Werror"
2261         SPL_LINUX_TRY_COMPILE([
2262                 #include <linux/rwsem.h>
2263         ],[
2264                 struct rw_semaphore dummy_semaphore __attribute__ ((unused));
2265                 raw_spinlock_t dummy_lock __attribute__ ((unused));
2266                 dummy_semaphore.wait_lock = dummy_lock;
2267         ],[
2268                 AC_MSG_RESULT(yes)
2269                 AC_DEFINE(RWSEM_SPINLOCK_IS_RAW, 1,
2270                 [struct rw_semaphore member wait_lock is raw_spinlock_t])
2271         ],[
2272                 AC_MSG_RESULT(no)
2273         ])
2274         EXTRA_KCFLAGS="$tmp_flags"
2275 ])
2276
2277 dnl #
2278 dnl # 3.9 API change,
2279 dnl # Moved things from linux/sched.h to linux/sched/rt.h
2280 dnl #
2281 AC_DEFUN([SPL_AC_SCHED_RT_HEADER],
2282         [AC_MSG_CHECKING([whether header linux/sched/rt.h exists])
2283         SPL_LINUX_TRY_COMPILE([
2284                 #include <linux/sched.h>
2285                 #include <linux/sched/rt.h>
2286         ],[
2287                 return 0;
2288         ],[
2289                 AC_DEFINE(HAVE_SCHED_RT_HEADER, 1, [linux/sched/rt.h exists])
2290                 AC_MSG_RESULT(yes)
2291         ],[
2292                 AC_MSG_RESULT(no)
2293         ])
2294 ])
2295
2296 dnl #
2297 dnl # 3.9 API change,
2298 dnl # vfs_getattr() uses 2 args
2299 dnl # It takes struct path * instead of struct vfsmount * and struct dentry *
2300 dnl #
2301 AC_DEFUN([SPL_AC_2ARGS_VFS_GETATTR], [
2302         AC_MSG_CHECKING([whether vfs_getattr() wants])
2303         SPL_LINUX_TRY_COMPILE([
2304                 #include <linux/fs.h>
2305         ],[
2306                 vfs_getattr((struct path *) NULL,
2307                         (struct kstat *)NULL);
2308         ],[
2309                 AC_MSG_RESULT(2 args)
2310                 AC_DEFINE(HAVE_2ARGS_VFS_GETATTR, 1,
2311                           [vfs_getattr wants 2 args])
2312         ],[
2313                 SPL_LINUX_TRY_COMPILE([
2314                         #include <linux/fs.h>
2315                 ],[
2316                         vfs_getattr((struct vfsmount *)NULL,
2317                                 (struct dentry *)NULL,
2318                                 (struct kstat *)NULL);
2319                 ],[
2320                         AC_MSG_RESULT(3 args)
2321                 ],[
2322                         AC_MSG_ERROR(unknown)
2323                 ])
2324         ])
2325 ])