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         SPL_AC_KERNEL_CONFIG
  12
  13         if test "${LINUX_OBJ}" != "${LINUX}"; then
  14                 KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
  15         fi
  16         AC_SUBST(KERNELMAKE_PARAMS)
  17
  18         KERNELCPPFLAGS="$KERNELCPPFLAGS -Wstrict-prototypes"
  19         AC_SUBST(KERNELCPPFLAGS)
  20
  21         SPL_AC_DEBUG
  22         SPL_AC_DEBUG_LOG
  23         SPL_AC_DEBUG_KMEM
  24         SPL_AC_DEBUG_KMEM_TRACKING
  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_3ARGS_INIT_WORK
  30         SPL_AC_2ARGS_REGISTER_SYSCTL
  31         SPL_AC_SET_SHRINKER
  32         SPL_AC_3ARGS_SHRINKER_CALLBACK
  33         SPL_AC_PATH_IN_NAMEIDATA
  34         SPL_AC_TASK_CURR
  35         SPL_AC_CTL_UNNUMBERED
  36         SPL_AC_CTL_NAME
  37         SPL_AC_FLS64
  38         SPL_AC_DEVICE_CREATE
  39         SPL_AC_5ARGS_DEVICE_CREATE
  40         SPL_AC_CLASS_DEVICE_CREATE
  41         SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT
  42         SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE
  43         SPL_AC_TIMESPEC_SUB
  44         SPL_AC_INIT_UTSNAME
  45         SPL_AC_FDTABLE_HEADER
  46         SPL_AC_FILES_FDTABLE
  47         SPL_AC_UACCESS_HEADER
  48         SPL_AC_KMALLOC_NODE
  49         SPL_AC_MONOTONIC_CLOCK
  50         SPL_AC_INODE_I_MUTEX
  51         SPL_AC_MUTEX_OWNER
  52         SPL_AC_MUTEX_OWNER_TASK_STRUCT
  53         SPL_AC_MUTEX_LOCK_NESTED
  54         SPL_AC_3ARGS_ON_EACH_CPU
  55         SPL_AC_KALLSYMS_LOOKUP_NAME
  56         SPL_AC_GET_VMALLOC_INFO
  57         SPL_AC_PGDAT_HELPERS
  58         SPL_AC_FIRST_ONLINE_PGDAT
  59         SPL_AC_NEXT_ONLINE_PGDAT
  60         SPL_AC_NEXT_ZONE
  61         SPL_AC_PGDAT_LIST
  62         SPL_AC_GLOBAL_PAGE_STATE
  63         SPL_AC_ZONE_STAT_ITEM_FREE
  64         SPL_AC_ZONE_STAT_ITEM_INACTIVE
  65         SPL_AC_ZONE_STAT_ITEM_ACTIVE
  66         SPL_AC_GET_ZONE_COUNTS
  67         SPL_AC_USER_PATH_DIR
  68         SPL_AC_SET_FS_PWD
  69         SPL_AC_2ARGS_SET_FS_PWD
  70         SPL_AC_2ARGS_VFS_UNLINK
  71         SPL_AC_4ARGS_VFS_RENAME
  72         SPL_AC_VFS_FSYNC
  73         SPL_AC_2ARGS_VFS_FSYNC
  74         SPL_AC_FS_STRUCT_SPINLOCK
  75         SPL_AC_CRED_STRUCT
  76         SPL_AC_GROUPS_SEARCH
  77         SPL_AC_PUT_TASK_STRUCT
  78         SPL_AC_5ARGS_PROC_HANDLER
  79         SPL_AC_KVASPRINTF
  80         SPL_AC_EXPORTED_RWSEM_IS_LOCKED
  81         SPL_AC_KERNEL_INVALIDATE_INODES
  82         SPL_AC_KERNEL_2ARGS_INVALIDATE_INODES
  83         SPL_AC_SHRINK_DCACHE_MEMORY
  84         SPL_AC_SHRINK_ICACHE_MEMORY
  85         SPL_AC_KERN_PATH_PARENT_HEADER
  86         SPL_AC_KERN_PATH_PARENT_SYMBOL
  87         SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
  88         SPL_AC_SHRINK_CONTROL_STRUCT
  89         SPL_AC_RWSEM_SPINLOCK_IS_RAW
  90 ])
  91
  92 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
  93         modpost=$LINUX/scripts/Makefile.modpost
  94         AC_MSG_CHECKING([kernel file name for module symbols])
  95         if test -f "$modpost"; then
  96                 if grep -q Modules.symvers $modpost; then
  97                         LINUX_SYMBOLS=Modules.symvers
  98                 else
  99                         LINUX_SYMBOLS=Module.symvers
 100                 fi
 101
 102                 if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
 103                         AC_MSG_ERROR([
 104         *** Please make sure the kernel devel package for your distribution
 105         *** is installed.  If your building with a custom kernel make sure the
 106         *** kernel is configured, built, and the '--with-linux=PATH' configure
 107         *** option refers to the location of the kernel source.])
 108                 fi
 109         else
 110                 LINUX_SYMBOLS=NONE
 111         fi
 112         AC_MSG_RESULT($LINUX_SYMBOLS)
 113         AC_SUBST(LINUX_SYMBOLS)
 114 ])
 115
 116 AC_DEFUN([SPL_AC_KERNEL], [
 117         AC_ARG_WITH([linux],
 118                 AS_HELP_STRING([--with-linux=PATH],
 119                 [Path to kernel source]),
 120                 [kernelsrc="$withval"])
 121
 122         AC_ARG_WITH([linux-obj],
 123                 AS_HELP_STRING([--with-linux-obj=PATH],
 124                 [Path to kernel build objects]),
 125                 [kernelbuild="$withval"])
 126
 127         AC_MSG_CHECKING([kernel source directory])
 128         if test -z "$kernelsrc"; then
 129                 if test -e "/lib/modules/$(uname -r)/source"; then
 130                         headersdir="/lib/modules/$(uname -r)/source"
 131                         sourcelink=$(readlink -f "$headersdir")
 132                 elif test -e "/lib/modules/$(uname -r)/build"; then
 133                         headersdir="/lib/modules/$(uname -r)/build"
 134                         sourcelink=$(readlink -f "$headersdir")
 135                 else
 136                         sourcelink=$(ls -1d /usr/src/kernels/* \
 137                                      /usr/src/linux-* \
 138                                      2>/dev/null | grep -v obj | tail -1)
 139                 fi
 140
 141                 if test -n "$sourcelink" && test -e ${sourcelink}; then
 142                         kernelsrc=`readlink -f ${sourcelink}`
 143                 else
 144                         AC_MSG_RESULT([Not found])
 145                         AC_MSG_ERROR([
 146         *** Please make sure the kernel devel package for your distribution
 147         *** is installed then try again.  If that fails you can specify the
 148         *** location of the kernel source with the '--with-linux=PATH' option.])
 149                 fi
 150         else
 151                 if test "$kernelsrc" = "NONE"; then
 152                         kernsrcver=NONE
 153                 fi
 154         fi
 155
 156         AC_MSG_RESULT([$kernelsrc])
 157         AC_MSG_CHECKING([kernel build directory])
 158         if test -z "$kernelbuild"; then
 159                 if test -e "/lib/modules/$(uname -r)/build"; then
 160                         kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
 161                 elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
 162                         kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
 163                 elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
 164                         kernelbuild=${kernelsrc}-obj/${target_cpu}/default
 165                 elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
 166                         kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
 167                 else
 168                         kernelbuild=${kernelsrc}
 169                 fi
 170         fi
 171         AC_MSG_RESULT([$kernelbuild])
 172
 173         AC_MSG_CHECKING([kernel source version])
 174         utsrelease1=$kernelbuild/include/linux/version.h
 175         utsrelease2=$kernelbuild/include/linux/utsrelease.h
 176         utsrelease3=$kernelbuild/include/generated/utsrelease.h
 177         if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
 178                 utsrelease=linux/version.h
 179         elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
 180                 utsrelease=linux/utsrelease.h
 181         elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
 182                 utsrelease=generated/utsrelease.h
 183         fi
 184
 185         if test "$utsrelease"; then
 186                 kernsrcver=`(echo "#include <$utsrelease>";
 187                              echo "kernsrcver=UTS_RELEASE") |
 188                              cpp -I $kernelbuild/include |
 189                              grep "^kernsrcver=" | cut -d \" -f 2`
 190
 191                 if test -z "$kernsrcver"; then
 192                         AC_MSG_RESULT([Not found])
 193                         AC_MSG_ERROR([*** Cannot determine kernel version.])
 194                 fi
 195         else
 196                 AC_MSG_RESULT([Not found])
 197                 AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
 198         fi
 199
 200         AC_MSG_RESULT([$kernsrcver])
 201
 202         LINUX=${kernelsrc}
 203         LINUX_OBJ=${kernelbuild}
 204         LINUX_VERSION=${kernsrcver}
 205
 206         AC_SUBST(LINUX)
 207         AC_SUBST(LINUX_OBJ)
 208         AC_SUBST(LINUX_VERSION)
 209
 210         SPL_AC_MODULE_SYMVERS
 211 ])
 212
 213 AC_DEFUN([SPL_AC_KERNEL_CONFIG], [
 214         SPL_LINUX_CONFIG([PREEMPT],
 215                 AC_MSG_ERROR([
 216                 *** Kernel built with CONFIG_PREEMPT which is not supported.
 217                 ** You must rebuild your kernel without this option.]), [])
 218 ])
 219
 220 dnl #
 221 dnl # Default SPL user configuration
 222 dnl #
 223 AC_DEFUN([SPL_AC_CONFIG_USER], [])
 224
 225 dnl #
 226 dnl # Check for rpm+rpmbuild to build RPM packages.  If these tools
 227 dnl # are missing it is non-fatal but you will not be able to build
 228 dnl # RPM packages and will be warned if you try too.
 229 dnl #
 230 AC_DEFUN([SPL_AC_RPM], [
 231         RPM=rpm
 232         RPMBUILD=rpmbuild
 233
 234         AC_MSG_CHECKING([whether $RPM is available])
 235         AS_IF([tmp=$($RPM --version 2>/dev/null)], [
 236                 RPM_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
 237                 HAVE_RPM=yes
 238                 AC_MSG_RESULT([$HAVE_RPM ($RPM_VERSION)])
 239         ],[
 240                 HAVE_RPM=no
 241                 AC_MSG_RESULT([$HAVE_RPM])
 242         ])
 243
 244         AC_MSG_CHECKING([whether $RPMBUILD is available])
 245         AS_IF([tmp=$($RPMBUILD --version 2>/dev/null)], [
 246                 RPMBUILD_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
 247                 HAVE_RPMBUILD=yes
 248                 AC_MSG_RESULT([$HAVE_RPMBUILD ($RPMBUILD_VERSION)])
 249         ],[
 250                 HAVE_RPMBUILD=no
 251                 AC_MSG_RESULT([$HAVE_RPMBUILD])
 252         ])
 253
 254         AC_SUBST(HAVE_RPM)
 255         AC_SUBST(RPM)
 256         AC_SUBST(RPM_VERSION)
 257
 258         AC_SUBST(HAVE_RPMBUILD)
 259         AC_SUBST(RPMBUILD)
 260         AC_SUBST(RPMBUILD_VERSION)
 261 ])
 262
 263 dnl #
 264 dnl # Check for dpkg+dpkg-buildpackage to build DEB packages.  If these
 265 dnl # tools are missing it is non-fatal but you will not be able to build
 266 dnl # DEB packages and will be warned if you try too.
 267 dnl #
 268 AC_DEFUN([SPL_AC_DPKG], [
 269         DPKG=dpkg
 270         DPKGBUILD=dpkg-buildpackage
 271
 272         AC_MSG_CHECKING([whether $DPKG is available])
 273         AS_IF([tmp=$($DPKG --version 2>/dev/null)], [
 274                 DPKG_VERSION=$(echo $tmp | $AWK '/Debian/ { print $[7] }')
 275                 HAVE_DPKG=yes
 276                 AC_MSG_RESULT([$HAVE_DPKG ($DPKG_VERSION)])
 277         ],[
 278                 HAVE_DPKG=no
 279                 AC_MSG_RESULT([$HAVE_DPKG])
 280         ])
 281
 282         AC_MSG_CHECKING([whether $DPKGBUILD is available])
 283         AS_IF([tmp=$($DPKGBUILD --version 2>/dev/null)], [
 284                 DPKGBUILD_VERSION=$(echo $tmp | \
 285                     $AWK '/Debian/ { print $[4] }' | cut -f-4 -d'.')
 286                 HAVE_DPKGBUILD=yes
 287                 AC_MSG_RESULT([$HAVE_DPKGBUILD ($DPKGBUILD_VERSION)])
 288         ],[
 289                 HAVE_DPKGBUILD=no
 290                 AC_MSG_RESULT([$HAVE_DPKGBUILD])
 291         ])
 292
 293         AC_SUBST(HAVE_DPKG)
 294         AC_SUBST(DPKG)
 295         AC_SUBST(DPKG_VERSION)
 296
 297         AC_SUBST(HAVE_DPKGBUILD)
 298         AC_SUBST(DPKGBUILD)
 299         AC_SUBST(DPKGBUILD_VERSION)
 300 ])
 301
 302 dnl #
 303 dnl # Check for pacman+makepkg to build Arch Linux packages.  If these
 304 dnl # tools are missing it is non-fatal but you will not be able to
 305 dnl # build Arch Linux packages and will be warned if you try too.
 306 dnl #
 307 AC_DEFUN([SPL_AC_PACMAN], [
 308         PACMAN=pacman
 309         MAKEPKG=makepkg
 310
 311         AC_MSG_CHECKING([whether $PACMAN is available])
 312         tmp=$($PACMAN --version 2>/dev/null)
 313         AS_IF([test -n "$tmp"], [
 314                 PACMAN_VERSION=$(echo $tmp |
 315                                  $AWK '/Pacman/ { print $[3] }' |
 316                                  $SED 's/^v//')
 317                 HAVE_PACMAN=yes
 318                 AC_MSG_RESULT([$HAVE_PACMAN ($PACMAN_VERSION)])
 319         ],[
 320                 HAVE_PACMAN=no
 321                 AC_MSG_RESULT([$HAVE_PACMAN])
 322         ])
 323
 324         AC_MSG_CHECKING([whether $MAKEPKG is available])
 325         tmp=$($MAKEPKG --version 2>/dev/null)
 326         AS_IF([test -n "$tmp"], [
 327                 MAKEPKG_VERSION=$(echo $tmp | $AWK '/makepkg/ { print $[3] }')
 328                 HAVE_MAKEPKG=yes
 329                 AC_MSG_RESULT([$HAVE_MAKEPKG ($MAKEPKG_VERSION)])
 330         ],[
 331                 HAVE_MAKEPKG=no
 332                 AC_MSG_RESULT([$HAVE_MAKEPKG])
 333         ])
 334
 335         AC_SUBST(HAVE_PACMAN)
 336         AC_SUBST(PACMAN)
 337         AC_SUBST(PACMAN_VERSION)
 338
 339         AC_SUBST(HAVE_MAKEPKG)
 340         AC_SUBST(MAKEPKG)
 341         AC_SUBST(MAKEPKG_VERSION)
 342 ])
 343
 344 dnl #
 345 dnl # Until native packaging for various different packing systems
 346 dnl # can be added the least we can do is attempt to use alien to
 347 dnl # convert the RPM packages to the needed package type.  This is
 348 dnl # a hack but so far it has worked reasonable well.
 349 dnl #
 350 AC_DEFUN([SPL_AC_ALIEN], [
 351         ALIEN=alien
 352
 353         AC_MSG_CHECKING([whether $ALIEN is available])
 354         AS_IF([tmp=$($ALIEN --version 2>/dev/null)], [
 355                 ALIEN_VERSION=$(echo $tmp | $AWK '{ print $[3] }')
 356                 HAVE_ALIEN=yes
 357                 AC_MSG_RESULT([$HAVE_ALIEN ($ALIEN_VERSION)])
 358         ],[
 359                 HAVE_ALIEN=no
 360                 AC_MSG_RESULT([$HAVE_ALIEN])
 361         ])
 362
 363         AC_SUBST(HAVE_ALIEN)
 364         AC_SUBST(ALIEN)
 365         AC_SUBST(ALIEN_VERSION)
 366 ])
 367
 368 dnl #
 369 dnl # Using the VENDOR tag from config.guess set the default
 370 dnl # package type for 'make pkg': (rpm | deb | tgz)
 371 dnl #
 372 AC_DEFUN([SPL_AC_DEFAULT_PACKAGE], [
 373         AC_MSG_CHECKING([linux distribution])
 374         if test -f /etc/toss-release ; then
 375                 VENDOR=toss ;
 376         elif test -f /etc/fedora-release ; then
 377                 VENDOR=fedora ;
 378         elif test -f /etc/redhat-release ; then
 379                 VENDOR=redhat ;
 380         elif test -f /etc/gentoo-release ; then
 381                 VENDOR=gentoo ;
 382         elif test -f /etc/arch-release ; then
 383                 VENDOR=arch ;
 384         elif test -f /etc/SuSE-release ; then
 385                 VENDOR=sles ;
 386         elif test -f /etc/slackware-version ; then
 387                 VENDOR=slackware ;
 388         elif test -f /etc/lunar.release ; then
 389                 VENDOR=lunar ;
 390         elif test -f /etc/lsb-release ; then
 391                 VENDOR=ubuntu ;
 392         elif test -f /etc/debian_version ; then
 393                 VENDOR=debian ;
 394         else
 395                 VENDOR= ;
 396         fi
 397         AC_MSG_RESULT([$VENDOR])
 398         AC_SUBST(VENDOR)
 399
 400         AC_MSG_CHECKING([default package type])
 401         case "$VENDOR" in
 402                 toss)       DEFAULT_PACKAGE=rpm  ;;
 403                 redhat)     DEFAULT_PACKAGE=rpm  ;;
 404                 fedora)     DEFAULT_PACKAGE=rpm  ;;
 405                 gentoo)     DEFAULT_PACKAGE=tgz  ;;
 406                 arch)       DEFAULT_PACKAGE=arch ;;
 407                 sles)       DEFAULT_PACKAGE=rpm  ;;
 408                 slackware)  DEFAULT_PACKAGE=tgz  ;;
 409                 lunar)      DEFAULT_PACKAGE=tgz  ;;
 410                 ubuntu)     DEFAULT_PACKAGE=deb  ;;
 411                 debian)     DEFAULT_PACKAGE=deb  ;;
 412                 *)          DEFAULT_PACKAGE=rpm  ;;
 413         esac
 414
 415         AC_MSG_RESULT([$DEFAULT_PACKAGE])
 416         AC_SUBST(DEFAULT_PACKAGE)
 417 ])
 418
 419 dnl #
 420 dnl # Default SPL user configuration
 421 dnl #
 422 AC_DEFUN([SPL_AC_PACKAGE], [
 423         SPL_AC_DEFAULT_PACKAGE
 424         SPL_AC_RPM
 425         SPL_AC_DPKG
 426         SPL_AC_ALIEN
 427
 428         AS_IF([test "$VENDOR" = "arch"], [SPL_AC_PACMAN])
 429 ])
 430
 431 AC_DEFUN([SPL_AC_LICENSE], [
 432         AC_MSG_CHECKING([spl license])
 433         LICENSE=GPL
 434         AC_MSG_RESULT([$LICENSE])
 435         KERNELCPPFLAGS="${KERNELCPPFLAGS} -DHAVE_GPL_ONLY_SYMBOLS"
 436         AC_SUBST(LICENSE)
 437 ])
 438
 439 AC_DEFUN([SPL_AC_CONFIG], [
 440         SPL_CONFIG=all
 441         AC_ARG_WITH([config],
 442                 AS_HELP_STRING([--with-config=CONFIG],
 443                 [Config file 'kernel|user|all|srpm']),
 444                 [SPL_CONFIG="$withval"])
 445
 446         AC_MSG_CHECKING([spl config])
 447         AC_MSG_RESULT([$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 "$SPL_CONFIG" = user] ||
 464                        [test "$SPL_CONFIG" = all])
 465         AM_CONDITIONAL([CONFIG_KERNEL],
 466                        [test "$SPL_CONFIG" = kernel] ||
 467                        [test "$SPL_CONFIG" = all])
 468 ])
 469
 470 dnl #
 471 dnl # Enable if the SPL should be compiled with internal debugging enabled.
 472 dnl # By default this support is disabled.
 473 dnl #
 474 AC_DEFUN([SPL_AC_DEBUG], [
 475         AC_MSG_CHECKING([whether debugging is enabled])
 476         AC_ARG_ENABLE([debug],
 477                 [AS_HELP_STRING([--enable-debug],
 478                 [Enable generic debug support @<:@default=no@:>@])],
 479                 [],
 480                 [enable_debug=no])
 481
 482         AS_IF([test "x$enable_debug" = xyes],
 483         [
 484                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG -Werror"
 485                 DEBUG_CFLAGS="-DDEBUG -Werror"
 486                 DEBUG_SPL="_with_debug"
 487         ], [
 488                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DNDEBUG"
 489                 DEBUG_CFLAGS="-DNDEBUG"
 490                 DEBUG_SPL="_without_debug"
 491         ])
 492
 493         AC_SUBST(DEBUG_CFLAGS)
 494         AC_SUBST(DEBUG_SPL)
 495         AC_MSG_RESULT([$enable_debug])
 496 ])
 497
 498 dnl #
 499 dnl # Enabled by default it provides a basic debug log infrastructure.
 500 dnl # Each subsystem registers itself with a name and logs messages
 501 dnl # using predefined types.  If the debug mask it set to allow the
 502 dnl # message type it will be written to the internal log.  The log
 503 dnl # can be dumped to a file by echoing 1 to the 'dump' proc entry,
 504 dnl # after dumping the log it must be decoded using the spl utility.
 505 dnl #
 506 dnl # echo 1 >/proc/sys/kernel/spl/debug/dump
 507 dnl # spl /tmp/spl-log.xxx.yyy /tmp/spl-log.xxx.yyy.txt
 508 dnl #
 509 AC_DEFUN([SPL_AC_DEBUG_LOG], [
 510         AC_ARG_ENABLE([debug-log],
 511                 [AS_HELP_STRING([--enable-debug-log],
 512                 [Enable basic debug logging @<:@default=yes@:>@])],
 513                 [],
 514                 [enable_debug_log=yes])
 515
 516         AS_IF([test "x$enable_debug_log" = xyes],
 517         [
 518                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_LOG"
 519                 DEBUG_LOG="_with_debug_log"
 520                 AC_DEFINE([DEBUG_LOG], [1],
 521                 [Define to 1 to enable basic debug logging])
 522         ], [
 523                 DEBUG_LOG="_without_debug_log"
 524         ])
 525
 526         AC_SUBST(DEBUG_LOG)
 527         AC_MSG_CHECKING([whether basic debug logging is enabled])
 528         AC_MSG_RESULT([$enable_debug_log])
 529 ])
 530
 531 dnl #
 532 dnl # Enabled by default it provides a minimal level of memory tracking.
 533 dnl # A total count of bytes allocated is kept for each alloc and free.
 534 dnl # Then at module unload time a report to the console will be printed
 535 dnl # if memory was leaked.  Additionally, /proc/spl/kmem/slab will exist
 536 dnl # and provide an easy way to inspect the kmem based slab.
 537 dnl #
 538 AC_DEFUN([SPL_AC_DEBUG_KMEM], [
 539         AC_ARG_ENABLE([debug-kmem],
 540                 [AS_HELP_STRING([--enable-debug-kmem],
 541                 [Enable basic kmem accounting @<:@default=yes@:>@])],
 542                 [],
 543                 [enable_debug_kmem=yes])
 544
 545         AS_IF([test "x$enable_debug_kmem" = xyes],
 546         [
 547                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM"
 548                 DEBUG_KMEM="_with_debug_kmem"
 549                 AC_DEFINE([DEBUG_KMEM], [1],
 550                 [Define to 1 to enable basic kmem accounting])
 551         ], [
 552                 DEBUG_KMEM="_without_debug_kmem"
 553         ])
 554
 555         AC_SUBST(DEBUG_KMEM)
 556         AC_MSG_CHECKING([whether basic kmem accounting is enabled])
 557         AC_MSG_RESULT([$enable_debug_kmem])
 558 ])
 559
 560 dnl #
 561 dnl # Disabled by default it provides detailed memory tracking.  This
 562 dnl # feature also requires --enable-debug-kmem to be set.  When enabled
 563 dnl # not only will total bytes be tracked but also the location of every
 564 dnl # alloc and free.  When the SPL module is unloaded a list of all leaked
 565 dnl # addresses and where they were allocated will be dumped to the console.
 566 dnl # Enabling this feature has a significant impact on performance but it
 567 dnl # makes finding memory leaks pretty straight forward.
 568 dnl #
 569 AC_DEFUN([SPL_AC_DEBUG_KMEM_TRACKING], [
 570         AC_ARG_ENABLE([debug-kmem-tracking],
 571                 [AS_HELP_STRING([--enable-debug-kmem-tracking],
 572                 [Enable detailed kmem tracking  @<:@default=no@:>@])],
 573                 [],
 574                 [enable_debug_kmem_tracking=no])
 575
 576         AS_IF([test "x$enable_debug_kmem_tracking" = xyes],
 577         [
 578                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM_TRACKING"
 579                 DEBUG_KMEM_TRACKING="_with_debug_kmem_tracking"
 580                 AC_DEFINE([DEBUG_KMEM_TRACKING], [1],
 581                 [Define to 1 to enable detailed kmem tracking])
 582         ], [
 583                 DEBUG_KMEM_TRACKING="_without_debug_kmem_tracking"
 584         ])
 585
 586         AC_SUBST(DEBUG_KMEM_TRACKING)
 587         AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
 588         AC_MSG_RESULT([$enable_debug_kmem_tracking])
 589 ])
 590
 591 dnl #
 592 dnl # SPL_LINUX_CONFTEST
 593 dnl #
 594 AC_DEFUN([SPL_LINUX_CONFTEST], [
 595 cat confdefs.h - <<_ACEOF >conftest.c
 596 $1
 597 _ACEOF
 598 ])
 599
 600 dnl #
 601 dnl # SPL_LANG_PROGRAM(C)([PROLOGUE], [BODY])
 602 dnl #
 603 m4_define([SPL_LANG_PROGRAM], [
 604 $1
 605 int
 606 main (void)
 607 {
 608 dnl Do *not* indent the following line: there may be CPP directives.
 609 dnl Don't move the `;' right after for the same reason.
 610 $2
 611   ;
 612   return 0;
 613 }
 614 ])
 615
 616 dnl #
 617 dnl # SPL_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
 618 dnl #
 619 AC_DEFUN([SPL_LINUX_COMPILE_IFELSE], [
 620         m4_ifvaln([$1], [SPL_LINUX_CONFTEST([$1])])
 621         rm -Rf build && mkdir -p build
 622         echo "obj-m := conftest.o" >build/Makefile
 623         AS_IF(
 624                 [AC_TRY_COMMAND(cp conftest.c build && make [$2] -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build) >/dev/null && AC_TRY_COMMAND([$3])],
 625                 [$4],
 626                 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
 627         )
 628         rm -Rf build
 629 ])
 630
 631 dnl #
 632 dnl # SPL_LINUX_TRY_COMPILE like AC_TRY_COMPILE
 633 dnl #
 634 AC_DEFUN([SPL_LINUX_TRY_COMPILE],
 635         [SPL_LINUX_COMPILE_IFELSE(
 636         [AC_LANG_SOURCE([SPL_LANG_PROGRAM([[$1]], [[$2]])])],
 637         [modules],
 638         [test -s build/conftest.o],
 639         [$3], [$4])
 640 ])
 641
 642 dnl #
 643 dnl # SPL_LINUX_CONFIG
 644 dnl #
 645 AC_DEFUN([SPL_LINUX_CONFIG],
 646         [AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
 647         SPL_LINUX_TRY_COMPILE([
 648                 #include <linux/module.h>
 649         ],[
 650                 #ifndef CONFIG_$1
 651                 #error CONFIG_$1 not #defined
 652                 #endif
 653         ],[
 654                 AC_MSG_RESULT([yes])
 655                 $2
 656         ],[
 657                 AC_MSG_RESULT([no])
 658                 $3
 659         ])
 660 ])
 661
 662 dnl #
 663 dnl # SPL_CHECK_SYMBOL_EXPORT
 664 dnl # check symbol exported or not
 665 dnl #
 666 AC_DEFUN([SPL_CHECK_SYMBOL_EXPORT],
 667         [AC_MSG_CHECKING([whether symbol $1 is exported])
 668         grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
 669                 $LINUX_OBJ/Module*.symvers 2>/dev/null
 670         rc=$?
 671         if test $rc -ne 0; then
 672                 export=0
 673                 for file in $2; do
 674                         grep -q -E "EXPORT_SYMBOL.*($1)" \
 675                                 "$LINUX_OBJ/$file" 2>/dev/null
 676                         rc=$?
 677                         if test $rc -eq 0; then
 678                                 export=1
 679                                 break;
 680                         fi
 681                 done
 682                 if test $export -eq 0; then
 683                         AC_MSG_RESULT([no])
 684                         $4
 685                 else
 686                         AC_MSG_RESULT([yes])
 687                         $3
 688                 fi
 689         else
 690                 AC_MSG_RESULT([yes])
 691                 $3
 692         fi
 693 ])
 694
 695 dnl #
 696 dnl # SPL_CHECK_SYMBOL_HEADER
 697 dnl # check if a symbol prototype is defined in listed headers.
 698 dnl #
 699 AC_DEFUN([SPL_CHECK_SYMBOL_HEADER], [
 700         AC_MSG_CHECKING([whether symbol $1 exists in header])
 701         header=0
 702         for file in $3; do
 703                 grep -q "$2" "$LINUX/$file" 2>/dev/null
 704                 rc=$?
 705                 if test $rc -eq 0; then
 706                         header=1
 707                         break;
 708                 fi
 709         done
 710         if test $header -eq 0; then
 711                 AC_MSG_RESULT([no])
 712                 $5
 713         else
 714                 AC_MSG_RESULT([yes])
 715                 $4
 716         fi
 717 ])
 718
 719 dnl #
 720 dnl # SPL_CHECK_HEADER
 721 dnl # check whether header exists and define HAVE_$2_HEADER
 722 dnl #
 723 AC_DEFUN([SPL_CHECK_HEADER],
 724         [AC_MSG_CHECKING([whether header $1 exists])
 725         SPL_LINUX_TRY_COMPILE([
 726                 #include <$1>
 727         ],[
 728                 return 0;
 729         ],[
 730                 AC_DEFINE(HAVE_$2_HEADER, 1, [$1 exists])
 731                 AC_MSG_RESULT(yes)
 732                 $3
 733         ],[
 734                 AC_MSG_RESULT(no)
 735                 $4
 736         ])
 737 ])
 738
 739 dnl #
 740 dnl # Use the atomic implemenation based on global spinlocks.  This
 741 dnl # should only be needed by 32-bit kernels which do not provide
 742 dnl # the atomic64_* API.  It may be optionally enabled as a fallback
 743 dnl # if problems are observed with the direct mapping to the native
 744 dnl # Linux atomic operations.  You may not disable atomic spinlocks
 745 dnl # if you kernel does not an atomic64_* API.
 746 dnl #
 747 AC_DEFUN([SPL_AC_ATOMIC_SPINLOCK], [
 748         AC_ARG_ENABLE([atomic-spinlocks],
 749                 [AS_HELP_STRING([--enable-atomic-spinlocks],
 750                 [Atomic types use spinlocks @<:@default=check@:>@])],
 751                 [],
 752                 [enable_atomic_spinlocks=check])
 753
 754         SPL_LINUX_TRY_COMPILE([
 755                 #include <asm/atomic.h>
 756         ],[
 757                 atomic64_t *ptr __attribute__ ((unused));
 758         ],[
 759                 have_atomic64_t=yes
 760                 AC_DEFINE(HAVE_ATOMIC64_T, 1,
 761                         [kernel defines atomic64_t])
 762         ],[
 763                 have_atomic64_t=no
 764         ])
 765
 766         AS_IF([test "x$enable_atomic_spinlocks" = xcheck], [
 767                 AS_IF([test "x$have_atomic64_t" = xyes], [
 768                         enable_atomic_spinlocks=no
 769                 ],[
 770                         enable_atomic_spinlocks=yes
 771                 ])
 772         ])
 773
 774         AS_IF([test "x$enable_atomic_spinlocks" = xyes], [
 775                 AC_DEFINE([ATOMIC_SPINLOCK], [1],
 776                         [Atomic types use spinlocks])
 777         ],[
 778                 AS_IF([test "x$have_atomic64_t" = xno], [
 779                         AC_MSG_FAILURE(
 780                         [--disable-atomic-spinlocks given but required atomic64 support is unavailable])
 781                 ])
 782         ])
 783
 784         AC_MSG_CHECKING([whether atomic types use spinlocks])
 785         AC_MSG_RESULT([$enable_atomic_spinlocks])
 786
 787         AC_MSG_CHECKING([whether kernel defines atomic64_t])
 788         AC_MSG_RESULT([$have_atomic64_t])
 789 ])
 790
 791 dnl #
 792 dnl # 2.6.24 API change,
 793 dnl # check if atomic64_cmpxchg is defined
 794 dnl #
 795 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_CMPXCHG],
 796         [AC_MSG_CHECKING([whether kernel defines atomic64_cmpxchg])
 797         SPL_LINUX_TRY_COMPILE([
 798                 #include <asm/atomic.h>
 799                 #include <asm/system.h>
 800         ],[
 801                 atomic64_cmpxchg((atomic64_t *)NULL, 0, 0);
 802         ],[
 803                 AC_MSG_RESULT([yes])
 804                 AC_DEFINE(HAVE_ATOMIC64_CMPXCHG, 1,
 805                           [kernel defines atomic64_cmpxchg])
 806         ],[
 807                 AC_MSG_RESULT([no])
 808         ])
 809 ])
 810
 811 dnl #
 812 dnl # 2.6.24 API change,
 813 dnl # check if atomic64_xchg is defined
 814 dnl #
 815 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_XCHG],
 816         [AC_MSG_CHECKING([whether kernel defines atomic64_xchg])
 817         SPL_LINUX_TRY_COMPILE([
 818                 #include <asm/atomic.h>
 819         ],[
 820                 atomic64_xchg((atomic64_t *)NULL, 0);
 821         ],[
 822                 AC_MSG_RESULT([yes])
 823                 AC_DEFINE(HAVE_ATOMIC64_XCHG, 1,
 824                           [kernel defines atomic64_xchg])
 825         ],[
 826                 AC_MSG_RESULT([no])
 827         ])
 828 ])
 829
 830 dnl #
 831 dnl # 2.6.24 API change,
 832 dnl # check if uintptr_t typedef is defined
 833 dnl #
 834 AC_DEFUN([SPL_AC_TYPE_UINTPTR_T],
 835         [AC_MSG_CHECKING([whether kernel defines uintptr_t])
 836         SPL_LINUX_TRY_COMPILE([
 837                 #include <linux/types.h>
 838         ],[
 839                 uintptr_t *ptr __attribute__ ((unused));
 840         ],[
 841                 AC_MSG_RESULT([yes])
 842                 AC_DEFINE(HAVE_UINTPTR_T, 1,
 843                           [kernel defines uintptr_t])
 844         ],[
 845                 AC_MSG_RESULT([no])
 846         ])
 847 ])
 848
 849 dnl #
 850 dnl # 2.6.20 API change,
 851 dnl # INIT_WORK use 2 args and not store data inside
 852 dnl #
 853 AC_DEFUN([SPL_AC_3ARGS_INIT_WORK],
 854         [AC_MSG_CHECKING([whether INIT_WORK wants 3 args])
 855         SPL_LINUX_TRY_COMPILE([
 856                 #include <linux/workqueue.h>
 857         ],[
 858                 struct work_struct work __attribute__ ((unused));
 859                 INIT_WORK(&work, NULL, NULL);
 860         ],[
 861                 AC_MSG_RESULT(yes)
 862                 AC_DEFINE(HAVE_3ARGS_INIT_WORK, 1,
 863                           [INIT_WORK wants 3 args])
 864         ],[
 865                 AC_MSG_RESULT(no)
 866         ])
 867 ])
 868
 869 dnl #
 870 dnl # 2.6.21 API change,
 871 dnl # 'register_sysctl_table' use only one argument instead of two
 872 dnl #
 873 AC_DEFUN([SPL_AC_2ARGS_REGISTER_SYSCTL],
 874         [AC_MSG_CHECKING([whether register_sysctl_table() wants 2 args])
 875         SPL_LINUX_TRY_COMPILE([
 876                 #include <linux/sysctl.h>
 877         ],[
 878                 (void) register_sysctl_table(NULL, 0);
 879         ],[
 880                 AC_MSG_RESULT(yes)
 881                 AC_DEFINE(HAVE_2ARGS_REGISTER_SYSCTL, 1,
 882                           [register_sysctl_table() wants 2 args])
 883         ],[
 884                 AC_MSG_RESULT(no)
 885         ])
 886 ])
 887
 888 dnl #
 889 dnl # 2.6.23 API change
 890 dnl # Old set_shrinker API replaced with register_shrinker
 891 dnl #
 892 AC_DEFUN([SPL_AC_SET_SHRINKER], [
 893         AC_MSG_CHECKING([whether set_shrinker() available])
 894         SPL_LINUX_TRY_COMPILE([
 895                 #include <linux/mm.h>
 896         ],[
 897                 return set_shrinker(DEFAULT_SEEKS, NULL);
 898         ],[
 899                 AC_MSG_RESULT([yes])
 900                 AC_DEFINE(HAVE_SET_SHRINKER, 1,
 901                           [set_shrinker() available])
 902         ],[
 903                 AC_MSG_RESULT([no])
 904         ])
 905 ])
 906
 907 dnl #
 908 dnl # 2.6.35 API change,
 909 dnl # Add context to shrinker callback
 910 dnl #
 911 AC_DEFUN([SPL_AC_3ARGS_SHRINKER_CALLBACK],
 912         [AC_MSG_CHECKING([whether shrinker callback wants 3 args])
 913         tmp_flags="$EXTRA_KCFLAGS"
 914         EXTRA_KCFLAGS="-Werror"
 915         SPL_LINUX_TRY_COMPILE([
 916                 #include <linux/mm.h>
 917
 918                 int shrinker_cb(struct shrinker *, int, unsigned int);
 919         ],[
 920                 struct shrinker cache_shrinker = {
 921                         .shrink = shrinker_cb,
 922                         .seeks = DEFAULT_SEEKS,
 923                 };
 924                 register_shrinker(&cache_shrinker);
 925         ],[
 926                 AC_MSG_RESULT(yes)
 927                 AC_DEFINE(HAVE_3ARGS_SHRINKER_CALLBACK, 1,
 928                           [shrinker callback wants 3 args])
 929         ],[
 930                 AC_MSG_RESULT(no)
 931         ])
 932         EXTRA_KCFLAGS="$tmp_flags"
 933 ])
 934
 935 dnl #
 936 dnl # 2.6.25 API change,
 937 dnl # struct path entry added to struct nameidata
 938 dnl #
 939 AC_DEFUN([SPL_AC_PATH_IN_NAMEIDATA],
 940         [AC_MSG_CHECKING([whether struct path used in struct nameidata])
 941         SPL_LINUX_TRY_COMPILE([
 942                 #include <linux/namei.h>
 943         ],[
 944                 struct nameidata nd __attribute__ ((unused));
 945
 946                 nd.path.mnt = NULL;
 947                 nd.path.dentry = NULL;
 948         ],[
 949                 AC_MSG_RESULT(yes)
 950                 AC_DEFINE(HAVE_PATH_IN_NAMEIDATA, 1,
 951                           [struct path used in struct nameidata])
 952         ],[
 953                 AC_MSG_RESULT(no)
 954         ])
 955 ])
 956
 957 dnl #
 958 dnl # Custom SPL patch may export this system it is not required
 959 dnl #
 960 AC_DEFUN([SPL_AC_TASK_CURR], [
 961         SPL_CHECK_SYMBOL_EXPORT([task_curr], [kernel/sched.c],
 962                 [AC_DEFINE(HAVE_TASK_CURR, 1, [task_curr() exported])],
 963                 [])
 964 ])
 965
 966 dnl #
 967 dnl # 2.6.19 API change,
 968 dnl # Use CTL_UNNUMBERED when binary sysctl is not required
 969 dnl #
 970 AC_DEFUN([SPL_AC_CTL_UNNUMBERED],
 971         [AC_MSG_CHECKING([whether unnumbered sysctl support exists])
 972         SPL_LINUX_TRY_COMPILE([
 973                 #include <linux/sysctl.h>
 974         ],[
 975                 #ifndef CTL_UNNUMBERED
 976                 #error CTL_UNNUMBERED undefined
 977                 #endif
 978         ],[
 979                 AC_MSG_RESULT(yes)
 980                 AC_DEFINE(HAVE_CTL_UNNUMBERED, 1,
 981                           [unnumbered sysctl support exists])
 982         ],[
 983                 AC_MSG_RESULT(no)
 984         ])
 985 ])
 986
 987 dnl #
 988 dnl # 2.6.33 API change,
 989 dnl # Removed .ctl_name from struct ctl_table.
 990 dnl #
 991 AC_DEFUN([SPL_AC_CTL_NAME], [
 992         AC_MSG_CHECKING([whether struct ctl_table has ctl_name])
 993         SPL_LINUX_TRY_COMPILE([
 994                 #include <linux/sysctl.h>
 995         ],[
 996                 struct ctl_table ctl __attribute__ ((unused));
 997                 ctl.ctl_name = 0;
 998         ],[
 999                 AC_MSG_RESULT(yes)
1000                 AC_DEFINE(HAVE_CTL_NAME, 1, [struct ctl_table has ctl_name])
1001         ],[
1002                 AC_MSG_RESULT(no)
1003         ])
1004 ])
1005
1006 dnl #
1007 dnl # 2.6.16 API change.
1008 dnl # Check if 'fls64()' is available
1009 dnl #
1010 AC_DEFUN([SPL_AC_FLS64],
1011         [AC_MSG_CHECKING([whether fls64() is available])
1012         SPL_LINUX_TRY_COMPILE([
1013                 #include <linux/bitops.h>
1014         ],[
1015                 return fls64(0);
1016         ],[
1017                 AC_MSG_RESULT(yes)
1018                 AC_DEFINE(HAVE_FLS64, 1, [fls64() is available])
1019         ],[
1020                 AC_MSG_RESULT(no)
1021         ])
1022 ])
1023
1024 dnl #
1025 dnl # 2.6.18 API change, check whether device_create() is available.
1026 dnl # Device_create() was introduced in 2.6.18 and depricated
1027 dnl # class_device_create() which was fully removed in 2.6.26.
1028 dnl #
1029 AC_DEFUN([SPL_AC_DEVICE_CREATE], [
1030         SPL_CHECK_SYMBOL_EXPORT(
1031                 [device_create],
1032                 [drivers/base/core.c],
1033                 [AC_DEFINE(HAVE_DEVICE_CREATE, 1,
1034                 [device_create() is available])],
1035                 [])
1036 ])
1037
1038 dnl #
1039 dnl # 2.6.27 API change,
1040 dnl # device_create() uses 5 args, new 'drvdata' argument.
1041 dnl #
1042 AC_DEFUN([SPL_AC_5ARGS_DEVICE_CREATE], [
1043         AC_MSG_CHECKING([whether device_create() wants 5 args])
1044         tmp_flags="$EXTRA_KCFLAGS"
1045         EXTRA_KCFLAGS="-Werror"
1046         SPL_LINUX_TRY_COMPILE([
1047                 #include <linux/device.h>
1048         ],[
1049                 device_create(NULL, NULL, 0, NULL, "%d", 1);
1050         ],[
1051                 AC_MSG_RESULT(yes)
1052                 AC_DEFINE(HAVE_5ARGS_DEVICE_CREATE, 1,
1053                           [device_create wants 5 args])
1054         ],[
1055                 AC_MSG_RESULT(no)
1056         ])
1057         EXTRA_KCFLAGS="$tmp_flags"
1058 ])
1059
1060 dnl #
1061 dnl # 2.6.13 API change, check whether class_device_create() is available.
1062 dnl # Class_device_create() was introduced in 2.6.13 and depricated
1063 dnl # class_simple_device_add() which was fully removed in 2.6.13.
1064 dnl #
1065 AC_DEFUN([SPL_AC_CLASS_DEVICE_CREATE], [
1066         SPL_CHECK_SYMBOL_EXPORT(
1067                 [class_device_create],
1068                 [drivers/base/class.c],
1069                 [AC_DEFINE(HAVE_CLASS_DEVICE_CREATE, 1,
1070                 [class_device_create() is available])],
1071                 [])
1072 ])
1073
1074 dnl #
1075 dnl # 2.6.26 API change, set_normalized_timespec() is exported.
1076 dnl #
1077 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT], [
1078         SPL_CHECK_SYMBOL_EXPORT(
1079                 [set_normalized_timespec],
1080                 [kernel/time.c],
1081                 [AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_EXPORT, 1,
1082                 [set_normalized_timespec() is available as export])],
1083                 [])
1084 ])
1085
1086 dnl #
1087 dnl # 2.6.16 API change, set_normalize_timespec() moved to time.c
1088 dnl # previously it was available in time.h as an inline.
1089 dnl #
1090 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE], [
1091         AC_MSG_CHECKING([whether set_normalized_timespec() is an inline])
1092         SPL_LINUX_TRY_COMPILE([
1093                 #include <linux/time.h>
1094                 void set_normalized_timespec(struct timespec *ts,
1095                                              time_t sec, long nsec) { }
1096         ],
1097         [],
1098         [
1099                 AC_MSG_RESULT(no)
1100         ],[
1101                 AC_MSG_RESULT(yes)
1102                 AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_INLINE, 1,
1103                           [set_normalized_timespec() is available as inline])
1104         ])
1105 ])
1106
1107 dnl #
1108 dnl # 2.6.18 API change,
1109 dnl # timespec_sub() inline function available in linux/time.h
1110 dnl #
1111 AC_DEFUN([SPL_AC_TIMESPEC_SUB], [
1112         AC_MSG_CHECKING([whether timespec_sub() is available])
1113         SPL_LINUX_TRY_COMPILE([
1114                 #include <linux/time.h>
1115         ],[
1116                 struct timespec a = { 0 };
1117                 struct timespec b = { 0 };
1118                 struct timespec c __attribute__ ((unused));
1119                 c = timespec_sub(a, b);
1120         ],[
1121                 AC_MSG_RESULT(yes)
1122                 AC_DEFINE(HAVE_TIMESPEC_SUB, 1, [timespec_sub() is available])
1123         ],[
1124                 AC_MSG_RESULT(no)
1125         ])
1126 ])
1127
1128 dnl #
1129 dnl # 2.6.19 API change,
1130 dnl # check if init_utsname() is available in linux/utsname.h
1131 dnl #
1132 AC_DEFUN([SPL_AC_INIT_UTSNAME], [
1133         AC_MSG_CHECKING([whether init_utsname() is available])
1134         SPL_LINUX_TRY_COMPILE([
1135                 #include <linux/utsname.h>
1136         ],[
1137                 struct new_utsname *a __attribute__ ((unused));
1138                 a = init_utsname();
1139         ],[
1140                 AC_MSG_RESULT(yes)
1141                 AC_DEFINE(HAVE_INIT_UTSNAME, 1, [init_utsname() is available])
1142         ],[
1143                 AC_MSG_RESULT(no)
1144         ])
1145 ])
1146
1147 dnl #
1148 dnl # 2.6.26 API change,
1149 dnl # definition of struct fdtable relocated to linux/fdtable.h
1150 dnl #
1151 AC_DEFUN([SPL_AC_FDTABLE_HEADER], [
1152         SPL_CHECK_HEADER([linux/fdtable.h], [FDTABLE], [], [])
1153 ])
1154
1155 dnl #
1156 dnl # 2.6.14 API change,
1157 dnl # check whether 'files_fdtable()' exists
1158 dnl #
1159 AC_DEFUN([SPL_AC_FILES_FDTABLE], [
1160         AC_MSG_CHECKING([whether files_fdtable() is available])
1161         SPL_LINUX_TRY_COMPILE([
1162                 #include <linux/sched.h>
1163                 #include <linux/file.h>
1164                 #ifdef HAVE_FDTABLE_HEADER
1165                 #include <linux/fdtable.h>
1166                 #endif
1167         ],[
1168                 struct files_struct *files = current->files;
1169                 struct fdtable *fdt __attribute__ ((unused));
1170                 fdt = files_fdtable(files);
1171         ],[
1172                 AC_MSG_RESULT(yes)
1173                 AC_DEFINE(HAVE_FILES_FDTABLE, 1, [files_fdtable() is available])
1174         ],[
1175                 AC_MSG_RESULT(no)
1176         ])
1177 ])
1178
1179 dnl #
1180 dnl # 2.6.18 API change,
1181 dnl # added linux/uaccess.h
1182 dnl #
1183 AC_DEFUN([SPL_AC_UACCESS_HEADER], [
1184         SPL_CHECK_HEADER([linux/uaccess.h], [UACCESS], [], [])
1185 ])
1186
1187 dnl #
1188 dnl # 2.6.12 API change,
1189 dnl # check whether 'kmalloc_node()' is available.
1190 dnl #
1191 AC_DEFUN([SPL_AC_KMALLOC_NODE], [
1192         AC_MSG_CHECKING([whether kmalloc_node() is available])
1193         SPL_LINUX_TRY_COMPILE([
1194                 #include <linux/slab.h>
1195         ],[
1196                 void *a __attribute__ ((unused));
1197                 a = kmalloc_node(1, GFP_KERNEL, 0);
1198         ],[
1199                 AC_MSG_RESULT(yes)
1200                 AC_DEFINE(HAVE_KMALLOC_NODE, 1, [kmalloc_node() is available])
1201         ],[
1202                 AC_MSG_RESULT(no)
1203         ])
1204 ])
1205
1206 dnl #
1207 dnl # 2.6.9 API change,
1208 dnl # check whether 'monotonic_clock()' is available it may
1209 dnl # be available for some archs but not others.
1210 dnl #
1211 AC_DEFUN([SPL_AC_MONOTONIC_CLOCK], [
1212         SPL_CHECK_SYMBOL_EXPORT(
1213                 [monotonic_clock],
1214                 [],
1215                 [AC_DEFINE(HAVE_MONOTONIC_CLOCK, 1,
1216                 [monotonic_clock() is available])],
1217                 [])
1218 ])
1219
1220 dnl #
1221 dnl # 2.6.16 API change,
1222 dnl # check whether 'struct inode' has i_mutex
1223 dnl #
1224 AC_DEFUN([SPL_AC_INODE_I_MUTEX], [
1225         AC_MSG_CHECKING([whether struct inode has i_mutex])
1226         SPL_LINUX_TRY_COMPILE([
1227                 #include <linux/fs.h>
1228                 #include <linux/mutex.h>
1229         ],[
1230                 struct inode i;
1231                 mutex_init(&i.i_mutex);
1232         ],[
1233                 AC_MSG_RESULT(yes)
1234                 AC_DEFINE(HAVE_INODE_I_MUTEX, 1, [struct inode has i_mutex])
1235         ],[
1236                 AC_MSG_RESULT(no)
1237         ])
1238 ])
1239
1240 dnl #
1241 dnl # 2.6.29 API change,
1242 dnl # Adaptive mutexs introduced.
1243 dnl #
1244 AC_DEFUN([SPL_AC_MUTEX_OWNER], [
1245         AC_MSG_CHECKING([whether struct mutex has owner])
1246         SPL_LINUX_TRY_COMPILE([
1247                 #include <linux/mutex.h>
1248         ],[
1249                 struct mutex mtx __attribute__ ((unused));
1250                 mtx.owner = NULL;
1251         ],[
1252                 AC_MSG_RESULT(yes)
1253                 AC_DEFINE(HAVE_MUTEX_OWNER, 1, [struct mutex has owner])
1254         ],[
1255                 AC_MSG_RESULT(no)
1256         ])
1257 ])
1258
1259 dnl #
1260 dnl # 2.6.39 API change,
1261 dnl # Owner type change.  A Linux mutex prior to 2.6.39 would store
1262 dnl # the owner as a thread_info pointer when CONFIG_DEBUG_MUTEXES
1263 dnl # was defined.  As of 2.6.39 this was changed to a task_struct
1264 dnl # pointer which frankly makes a lot more sense.
1265 dnl #
1266 AC_DEFUN([SPL_AC_MUTEX_OWNER_TASK_STRUCT], [
1267         AC_MSG_CHECKING([whether struct mutex owner is a task_struct])
1268         tmp_flags="$EXTRA_KCFLAGS"
1269         EXTRA_KCFLAGS="-Werror"
1270         SPL_LINUX_TRY_COMPILE([
1271                 #include <linux/mutex.h>
1272         ],[
1273                 struct mutex mtx __attribute__ ((unused));
1274                 mtx.owner = current;
1275         ],[
1276                 AC_MSG_RESULT(yes)
1277                 AC_DEFINE(HAVE_MUTEX_OWNER_TASK_STRUCT, 1,
1278                 [struct mutex owner is a task_struct])
1279         ],[
1280                 AC_MSG_RESULT(no)
1281         ])
1282         EXTRA_KCFLAGS="$tmp_flags"
1283 ])
1284
1285 dnl #
1286 dnl # 2.6.18 API change,
1287 dnl # First introduced 'mutex_lock_nested()' in include/linux/mutex.h,
1288 dnl # as part of the mutex validator.  Fallback to using 'mutex_lock()'
1289 dnl # if the mutex validator is disabled or otherwise unavailable.
1290 dnl #
1291 AC_DEFUN([SPL_AC_MUTEX_LOCK_NESTED], [
1292         AC_MSG_CHECKING([whether mutex_lock_nested() is available])
1293         SPL_LINUX_TRY_COMPILE([
1294                 #include <linux/mutex.h>
1295         ],[
1296                 struct mutex mutex;
1297                 mutex_init(&mutex);
1298                 mutex_lock_nested(&mutex, 0);
1299         ],[
1300                 AC_MSG_RESULT(yes)
1301                 AC_DEFINE(HAVE_MUTEX_LOCK_NESTED, 1,
1302                 [mutex_lock_nested() is available])
1303         ],[
1304                 AC_MSG_RESULT(no)
1305         ])
1306 ])
1307
1308 dnl #
1309 dnl # 2.6.27 API change,
1310 dnl # on_each_cpu() uses 3 args, no 'retry' argument
1311 dnl #
1312 AC_DEFUN([SPL_AC_3ARGS_ON_EACH_CPU], [
1313         AC_MSG_CHECKING([whether on_each_cpu() wants 3 args])
1314         SPL_LINUX_TRY_COMPILE([
1315                 #include <linux/smp.h>
1316         ],[
1317                 on_each_cpu(NULL, NULL, 0);
1318         ],[
1319                 AC_MSG_RESULT(yes)
1320                 AC_DEFINE(HAVE_3ARGS_ON_EACH_CPU, 1,
1321                           [on_each_cpu wants 3 args])
1322         ],[
1323                 AC_MSG_RESULT(no)
1324         ])
1325 ])
1326
1327 dnl #
1328 dnl # 2.6.18 API change,
1329 dnl # kallsyms_lookup_name no longer exported
1330 dnl #
1331 AC_DEFUN([SPL_AC_KALLSYMS_LOOKUP_NAME], [
1332         SPL_CHECK_SYMBOL_EXPORT(
1333                 [kallsyms_lookup_name],
1334                 [],
1335                 [AC_DEFINE(HAVE_KALLSYMS_LOOKUP_NAME, 1,
1336                 [kallsyms_lookup_name() is available])],
1337                 [])
1338 ])
1339
1340 dnl #
1341 dnl # Proposed API change,
1342 dnl # This symbol is not available in stock kernels.  You may build a
1343 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1344 dnl # these symbols for use.  If your already rolling a custom kernel for
1345 dnl # your environment this is recommended.
1346 dnl #
1347 AC_DEFUN([SPL_AC_GET_VMALLOC_INFO], [
1348         SPL_CHECK_SYMBOL_EXPORT(
1349                 [get_vmalloc_info],
1350                 [],
1351                 [AC_DEFINE(HAVE_GET_VMALLOC_INFO, 1,
1352                 [get_vmalloc_info() is available])],
1353                 [])
1354 ])
1355
1356 dnl #
1357 dnl # 2.6.17 API change
1358 dnl # The helper functions first_online_pgdat(), next_online_pgdat(), and
1359 dnl # next_zone() are introduced to simplify for_each_zone().  These symbols
1360 dnl # were exported in 2.6.17 for use by modules which was consistent with
1361 dnl # the previous implementation of for_each_zone().  From 2.6.18 - 2.6.19
1362 dnl # the symbols were exported as 'unused', and by 2.6.20 they exports
1363 dnl # were dropped entirely leaving modules no way to directly iterate over
1364 dnl # the zone list.  Because we need access to the zone helpers we check
1365 dnl # if the kernel contains the old or new implementation.  Then we check
1366 dnl # to see if the symbols we need for each version are available.  If they
1367 dnl # are not, dynamically aquire the addresses with kallsyms_lookup_name().
1368 dnl #
1369 AC_DEFUN([SPL_AC_PGDAT_HELPERS], [
1370         AC_MSG_CHECKING([whether symbol *_pgdat exist])
1371         grep -q -E 'first_online_pgdat' $LINUX/include/linux/mmzone.h 2>/dev/null
1372         rc=$?
1373         if test $rc -eq 0; then
1374                 AC_MSG_RESULT([yes])
1375                 AC_DEFINE(HAVE_PGDAT_HELPERS, 1, [pgdat helpers are available])
1376         else
1377                 AC_MSG_RESULT([no])
1378         fi
1379 ])
1380
1381 dnl #
1382 dnl # Proposed API change,
1383 dnl # This symbol is not available in stock kernels.  You may build a
1384 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1385 dnl # these symbols for use.  If your already rolling a custom kernel for
1386 dnl # your environment this is recommended.
1387 dnl #
1388 AC_DEFUN([SPL_AC_FIRST_ONLINE_PGDAT], [
1389         SPL_CHECK_SYMBOL_EXPORT(
1390                 [first_online_pgdat],
1391                 [],
1392                 [AC_DEFINE(HAVE_FIRST_ONLINE_PGDAT, 1,
1393                 [first_online_pgdat() is available])],
1394                 [])
1395 ])
1396
1397 dnl #
1398 dnl # Proposed API change,
1399 dnl # This symbol is not available in stock kernels.  You may build a
1400 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1401 dnl # these symbols for use.  If your already rolling a custom kernel for
1402 dnl # your environment this is recommended.
1403 dnl #
1404 AC_DEFUN([SPL_AC_NEXT_ONLINE_PGDAT], [
1405         SPL_CHECK_SYMBOL_EXPORT(
1406                 [next_online_pgdat],
1407                 [],
1408                 [AC_DEFINE(HAVE_NEXT_ONLINE_PGDAT, 1,
1409                 [next_online_pgdat() is available])],
1410                 [])
1411 ])
1412
1413 dnl #
1414 dnl # Proposed API change,
1415 dnl # This symbol is not available in stock kernels.  You may build a
1416 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1417 dnl # these symbols for use.  If your already rolling a custom kernel for
1418 dnl # your environment this is recommended.
1419 dnl #
1420 AC_DEFUN([SPL_AC_NEXT_ZONE], [
1421         SPL_CHECK_SYMBOL_EXPORT(
1422                 [next_zone],
1423                 [],
1424                 [AC_DEFINE(HAVE_NEXT_ZONE, 1,
1425                 [next_zone() is available])],
1426                 [])
1427 ])
1428
1429 dnl #
1430 dnl # 2.6.17 API change,
1431 dnl # See SPL_AC_PGDAT_HELPERS for details.
1432 dnl #
1433 AC_DEFUN([SPL_AC_PGDAT_LIST], [
1434         SPL_CHECK_SYMBOL_EXPORT(
1435                 [pgdat_list],
1436                 [],
1437                 [AC_DEFINE(HAVE_PGDAT_LIST, 1,
1438                 [pgdat_list is available])],
1439                 [])
1440 ])
1441
1442 dnl #
1443 dnl # 2.6.18 API change,
1444 dnl # First introduced global_page_state() support as an inline.
1445 dnl #
1446 AC_DEFUN([SPL_AC_GLOBAL_PAGE_STATE], [
1447         AC_MSG_CHECKING([whether global_page_state() is available])
1448         SPL_LINUX_TRY_COMPILE([
1449                 #include <linux/mm.h>
1450         ],[
1451                 unsigned long state __attribute__ ((unused));
1452                 state = global_page_state(0);
1453         ],[
1454                 AC_MSG_RESULT(yes)
1455                 AC_DEFINE(HAVE_GLOBAL_PAGE_STATE, 1,
1456                           [global_page_state() is available])
1457         ],[
1458                 AC_MSG_RESULT(no)
1459         ])
1460 ])
1461
1462 dnl #
1463 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1464 dnl # Public global zone stats now include a free page count.  However
1465 dnl # the enumerated names of the counters have changed since this API
1466 dnl # was introduced.  We need to deduce the corrent name to use.  This
1467 dnl # replaces the priviate get_zone_counts() interface.
1468 dnl #
1469 dnl # NR_FREE_PAGES was available from 2.6.21 to current kernels, which
1470 dnl # is 2.6.30 as of when this was written.
1471 dnl #
1472 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_FREE], [
1473         AC_MSG_CHECKING([whether page state NR_FREE_PAGES is available])
1474         SPL_LINUX_TRY_COMPILE([
1475                 #include <linux/mm.h>
1476         ],[
1477                 enum zone_stat_item zsi __attribute__ ((unused));
1478                 zsi = NR_FREE_PAGES;
1479         ],[
1480                 AC_MSG_RESULT(yes)
1481                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES, 1,
1482                           [Page state NR_FREE_PAGES is available])
1483         ],[
1484                 AC_MSG_RESULT(no)
1485         ])
1486 ])
1487
1488 dnl #
1489 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1490 dnl # Public global zone stats now include an inactive page count.  However
1491 dnl # the enumerated names of the counters have changed since this API
1492 dnl # was introduced.  We need to deduce the corrent name to use.  This
1493 dnl # replaces the priviate get_zone_counts() interface.
1494 dnl #
1495 dnl # NR_INACTIVE was available from 2.6.21 to 2.6.27 and included both
1496 dnl # anonymous and file inactive pages.  As of 2.6.28 it was split in
1497 dnl # to NR_INACTIVE_ANON and NR_INACTIVE_FILE.
1498 dnl #
1499 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_INACTIVE], [
1500         AC_MSG_CHECKING([whether page state NR_INACTIVE is available])
1501         SPL_LINUX_TRY_COMPILE([
1502                 #include <linux/mm.h>
1503         ],[
1504                 enum zone_stat_item zsi __attribute__ ((unused));
1505                 zsi = NR_INACTIVE;
1506         ],[
1507                 AC_MSG_RESULT(yes)
1508                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE, 1,
1509                           [Page state NR_INACTIVE is available])
1510         ],[
1511                 AC_MSG_RESULT(no)
1512         ])
1513
1514         AC_MSG_CHECKING([whether page state NR_INACTIVE_ANON is available])
1515         SPL_LINUX_TRY_COMPILE([
1516                 #include <linux/mm.h>
1517         ],[
1518                 enum zone_stat_item zsi __attribute__ ((unused));
1519                 zsi = NR_INACTIVE_ANON;
1520         ],[
1521                 AC_MSG_RESULT(yes)
1522                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON, 1,
1523                           [Page state NR_INACTIVE_ANON is available])
1524         ],[
1525                 AC_MSG_RESULT(no)
1526         ])
1527
1528         AC_MSG_CHECKING([whether page state NR_INACTIVE_FILE is available])
1529         SPL_LINUX_TRY_COMPILE([
1530                 #include <linux/mm.h>
1531         ],[
1532                 enum zone_stat_item zsi __attribute__ ((unused));
1533                 zsi = NR_INACTIVE_FILE;
1534         ],[
1535                 AC_MSG_RESULT(yes)
1536                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE, 1,
1537                           [Page state NR_INACTIVE_FILE is available])
1538         ],[
1539                 AC_MSG_RESULT(no)
1540         ])
1541 ])
1542
1543 dnl #
1544 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1545 dnl # Public global zone stats now include an active page count.  However
1546 dnl # the enumerated names of the counters have changed since this API
1547 dnl # was introduced.  We need to deduce the corrent name to use.  This
1548 dnl # replaces the priviate get_zone_counts() interface.
1549 dnl #
1550 dnl # NR_ACTIVE was available from 2.6.21 to 2.6.27 and included both
1551 dnl # anonymous and file active pages.  As of 2.6.28 it was split in
1552 dnl # to NR_ACTIVE_ANON and NR_ACTIVE_FILE.
1553 dnl #
1554 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_ACTIVE], [
1555         AC_MSG_CHECKING([whether page state NR_ACTIVE is available])
1556         SPL_LINUX_TRY_COMPILE([
1557                 #include <linux/mm.h>
1558         ],[
1559                 enum zone_stat_item zsi __attribute__ ((unused));
1560                 zsi = NR_ACTIVE;
1561         ],[
1562                 AC_MSG_RESULT(yes)
1563                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE, 1,
1564                           [Page state NR_ACTIVE is available])
1565         ],[
1566                 AC_MSG_RESULT(no)
1567         ])
1568
1569         AC_MSG_CHECKING([whether page state NR_ACTIVE_ANON is available])
1570         SPL_LINUX_TRY_COMPILE([
1571                 #include <linux/mm.h>
1572         ],[
1573                 enum zone_stat_item zsi __attribute__ ((unused));
1574                 zsi = NR_ACTIVE_ANON;
1575         ],[
1576                 AC_MSG_RESULT(yes)
1577                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON, 1,
1578                           [Page state NR_ACTIVE_ANON is available])
1579         ],[
1580                 AC_MSG_RESULT(no)
1581         ])
1582
1583         AC_MSG_CHECKING([whether page state NR_ACTIVE_FILE is available])
1584         SPL_LINUX_TRY_COMPILE([
1585                 #include <linux/mm.h>
1586         ],[
1587                 enum zone_stat_item zsi __attribute__ ((unused));
1588                 zsi = NR_ACTIVE_FILE;
1589         ],[
1590                 AC_MSG_RESULT(yes)
1591                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE, 1,
1592                           [Page state NR_ACTIVE_FILE is available])
1593         ],[
1594                 AC_MSG_RESULT(no)
1595         ])
1596 ])
1597
1598 dnl #
1599 dnl # Proposed API change for legacy kernels.
1600 dnl # This symbol is not available in older kernels.  For kernels post
1601 dnl # 2.6.21 the global_page_state() API is used to get free/inactive/active
1602 dnl # page state information.  This symbol is only used in legacy kernels
1603 dnl # any only as a last resort.
1604 dnl
1605 AC_DEFUN([SPL_AC_GET_ZONE_COUNTS], [
1606         AC_MSG_CHECKING([whether symbol get_zone_counts is needed])
1607         SPL_LINUX_TRY_COMPILE([
1608         ],[
1609                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES)
1610                 #error "global_page_state needs NR_FREE_PAGES"
1611                 #endif
1612
1613                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE) && \
1614                     !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON) && \
1615                     !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE)
1616                 #error "global_page_state needs NR_ACTIVE*"
1617                 #endif
1618
1619                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE) && \
1620                     !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON) && \
1621                     !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE)
1622                 #error "global_page_state needs NR_INACTIVE*"
1623                 #endif
1624         ],[
1625                 AC_MSG_RESULT(no)
1626         ],[
1627                 AC_MSG_RESULT(yes)
1628                 AC_DEFINE(NEED_GET_ZONE_COUNTS, 1,
1629                           [get_zone_counts() is needed])
1630
1631                 SPL_CHECK_SYMBOL_EXPORT(
1632                         [get_zone_counts],
1633                         [],
1634                         [AC_DEFINE(HAVE_GET_ZONE_COUNTS, 1,
1635                         [get_zone_counts() is available])],
1636                         [])
1637         ])
1638 ])
1639
1640 dnl #
1641 dnl # 2.6.27 API change,
1642 dnl # The user_path_dir() replaces __user_walk()
1643 dnl #
1644 AC_DEFUN([SPL_AC_USER_PATH_DIR], [
1645         SPL_CHECK_SYMBOL_EXPORT(
1646                 [user_path_at],
1647                 [],
1648                 [AC_DEFINE(HAVE_USER_PATH_DIR, 1,
1649                 [user_path_dir() is available])],
1650                 [])
1651 ])
1652
1653 dnl #
1654 dnl # Symbol available in RHEL kernels not in stock kernels.
1655 dnl #
1656 AC_DEFUN([SPL_AC_SET_FS_PWD], [
1657         SPL_CHECK_SYMBOL_EXPORT(
1658                 [set_fs_pwd],
1659                 [],
1660                 [AC_DEFINE(HAVE_SET_FS_PWD, 1,
1661                 [set_fs_pwd() is available])],
1662                 [])
1663 ])
1664
1665 dnl #
1666 dnl # 2.6.25 API change,
1667 dnl # Simplied API by replacing mnt+dentry args with a single path arg.
1668 dnl #
1669 AC_DEFUN([SPL_AC_2ARGS_SET_FS_PWD],
1670         [AC_MSG_CHECKING([whether set_fs_pwd() wants 2 args])
1671         SPL_LINUX_TRY_COMPILE([
1672                 #include <linux/sched.h>
1673                 #include <linux/fs_struct.h>
1674         ],[
1675                 set_fs_pwd(NULL, NULL);
1676         ],[
1677                 AC_MSG_RESULT(yes)
1678                 AC_DEFINE(HAVE_2ARGS_SET_FS_PWD, 1,
1679                           [set_fs_pwd() wants 2 args])
1680         ],[
1681                 AC_MSG_RESULT(no)
1682         ])
1683 ])
1684
1685 dnl #
1686 dnl # SLES API change, never adopted in mainline,
1687 dnl # Third 'struct vfsmount *' argument removed.
1688 dnl #
1689 AC_DEFUN([SPL_AC_2ARGS_VFS_UNLINK],
1690         [AC_MSG_CHECKING([whether vfs_unlink() wants 2 args])
1691         SPL_LINUX_TRY_COMPILE([
1692                 #include <linux/fs.h>
1693         ],[
1694                 vfs_unlink(NULL, NULL);
1695         ],[
1696                 AC_MSG_RESULT(yes)
1697                 AC_DEFINE(HAVE_2ARGS_VFS_UNLINK, 1,
1698                           [vfs_unlink() wants 2 args])
1699         ],[
1700                 AC_MSG_RESULT(no)
1701         ])
1702 ])
1703
1704 dnl #
1705 dnl # SLES API change, never adopted in mainline,
1706 dnl # Third and sixth 'struct vfsmount *' argument removed.
1707 dnl #
1708 AC_DEFUN([SPL_AC_4ARGS_VFS_RENAME],
1709         [AC_MSG_CHECKING([whether vfs_rename() wants 4 args])
1710         SPL_LINUX_TRY_COMPILE([
1711                 #include <linux/fs.h>
1712         ],[
1713                 vfs_rename(NULL, NULL, NULL, NULL);
1714         ],[
1715                 AC_MSG_RESULT(yes)
1716                 AC_DEFINE(HAVE_4ARGS_VFS_RENAME, 1,
1717                           [vfs_rename() wants 4 args])
1718         ],[
1719                 AC_MSG_RESULT(no)
1720         ])
1721 ])
1722
1723 dnl #
1724 dnl # 2.6.36 API change,
1725 dnl # The 'struct fs_struct->lock' was changed from a rwlock_t to
1726 dnl # a spinlock_t to improve the fastpath performance.
1727 dnl #
1728 AC_DEFUN([SPL_AC_FS_STRUCT_SPINLOCK], [
1729         AC_MSG_CHECKING([whether struct fs_struct uses spinlock_t])
1730         tmp_flags="$EXTRA_KCFLAGS"
1731         EXTRA_KCFLAGS="-Werror"
1732         SPL_LINUX_TRY_COMPILE([
1733                 #include <linux/sched.h>
1734                 #include <linux/fs_struct.h>
1735         ],[
1736                 struct fs_struct fs;
1737                 spin_lock_init(&fs.lock);
1738         ],[
1739                 AC_MSG_RESULT(yes)
1740                 AC_DEFINE(HAVE_FS_STRUCT_SPINLOCK, 1,
1741                           [struct fs_struct uses spinlock_t])
1742         ],[
1743                 AC_MSG_RESULT(no)
1744         ])
1745         EXTRA_KCFLAGS="$tmp_flags"
1746 ])
1747
1748 dnl #
1749 dnl # 2.6.29 API change,
1750 dnl # check whether 'struct cred' exists
1751 dnl #
1752 AC_DEFUN([SPL_AC_CRED_STRUCT], [
1753         AC_MSG_CHECKING([whether struct cred exists])
1754         SPL_LINUX_TRY_COMPILE([
1755                 #include <linux/cred.h>
1756         ],[
1757                 struct cred *cr __attribute__ ((unused));
1758                 cr  = NULL;
1759         ],[
1760                 AC_MSG_RESULT(yes)
1761                 AC_DEFINE(HAVE_CRED_STRUCT, 1, [struct cred exists])
1762         ],[
1763                 AC_MSG_RESULT(no)
1764         ])
1765 ])
1766
1767 dnl #
1768 dnl # Custom SPL patch may export this symbol.
1769 dnl #
1770 AC_DEFUN([SPL_AC_GROUPS_SEARCH], [
1771         SPL_CHECK_SYMBOL_EXPORT(
1772                 [groups_search],
1773                 [],
1774                 [AC_DEFINE(HAVE_GROUPS_SEARCH, 1,
1775                 [groups_search() is available])],
1776                 [])
1777 ])
1778
1779 dnl #
1780 dnl # 2.6.x API change,
1781 dnl # __put_task_struct() was exported in RHEL5 but unavailable elsewhere.
1782 dnl #
1783 AC_DEFUN([SPL_AC_PUT_TASK_STRUCT], [
1784         SPL_CHECK_SYMBOL_EXPORT(
1785                 [__put_task_struct],
1786                 [],
1787                 [AC_DEFINE(HAVE_PUT_TASK_STRUCT, 1,
1788                 [__put_task_struct() is available])],
1789                 [])
1790 ])
1791
1792 dnl #
1793 dnl # 2.6.32 API change,
1794 dnl # Unused 'struct file *' removed from prototype.
1795 dnl #
1796 AC_DEFUN([SPL_AC_5ARGS_PROC_HANDLER], [
1797         AC_MSG_CHECKING([whether proc_handler() wants 5 args])
1798         SPL_LINUX_TRY_COMPILE([
1799                 #include <linux/sysctl.h>
1800         ],[
1801                 proc_dostring(NULL, 0, NULL, NULL, NULL);
1802         ],[
1803                 AC_MSG_RESULT(yes)
1804                 AC_DEFINE(HAVE_5ARGS_PROC_HANDLER, 1,
1805                           [proc_handler() wants 5 args])
1806         ],[
1807                 AC_MSG_RESULT(no)
1808         ])
1809 ])
1810
1811 dnl #
1812 dnl # 2.6.x API change,
1813 dnl # kvasprintf() function added.
1814 dnl #
1815 AC_DEFUN([SPL_AC_KVASPRINTF], [
1816         SPL_CHECK_SYMBOL_EXPORT(
1817                 [kvasprintf],
1818                 [],
1819                 [AC_DEFINE(HAVE_KVASPRINTF, 1,
1820                 [kvasprintf() is available])],
1821                 [])
1822 ])
1823
1824 dnl #
1825 dnl # 2.6.29 API change,
1826 dnl # vfs_fsync() funcation added, prior to this use file_fsync().
1827 dnl #
1828 AC_DEFUN([SPL_AC_VFS_FSYNC], [
1829         SPL_CHECK_SYMBOL_EXPORT(
1830                 [vfs_fsync],
1831                 [fs/sync.c],
1832                 [AC_DEFINE(HAVE_VFS_FSYNC, 1, [vfs_fsync() is available])],
1833                 [])
1834 ])
1835
1836 dnl #
1837 dnl # 2.6.35 API change,
1838 dnl # Unused 'struct dentry *' removed from vfs_fsync() prototype.
1839 dnl #
1840 AC_DEFUN([SPL_AC_2ARGS_VFS_FSYNC], [
1841         AC_MSG_CHECKING([whether vfs_fsync() wants 2 args])
1842         SPL_LINUX_TRY_COMPILE([
1843                 #include <linux/fs.h>
1844         ],[
1845                 vfs_fsync(NULL, 0);
1846         ],[
1847                 AC_MSG_RESULT(yes)
1848                 AC_DEFINE(HAVE_2ARGS_VFS_FSYNC, 1, [vfs_fsync() wants 2 args])
1849         ],[
1850                 AC_MSG_RESULT(no)
1851         ])
1852 ])
1853
1854 dnl #
1855 dnl # 2.6.33 API change. Also backported in RHEL5 as of 2.6.18-190.el5.
1856 dnl # Earlier versions of rwsem_is_locked() were inline and had a race
1857 dnl # condition.  The fixed version is exported as a symbol.  The race
1858 dnl # condition is fixed by acquiring sem->wait_lock, so we must not
1859 dnl # call that version while holding sem->wait_lock.
1860 dnl #
1861 AC_DEFUN([SPL_AC_EXPORTED_RWSEM_IS_LOCKED], [
1862         SPL_CHECK_SYMBOL_EXPORT(
1863                 [rwsem_is_locked],
1864                 [lib/rwsem-spinlock.c],
1865                 [AC_DEFINE(RWSEM_IS_LOCKED_TAKES_WAIT_LOCK, 1,
1866                 [rwsem_is_locked() acquires sem->wait_lock])],
1867                 [])
1868 ])
1869
1870 dnl #
1871 dnl # 2.6.37 API compat,
1872 dnl # The function invalidate_inodes() is no longer exported by the kernel.
1873 dnl # The prototype however is still available which means it is safe
1874 dnl # to acquire the symbol's address using spl_kallsyms_lookup_name().
1875 dnl #
1876 dnl # The Proxmox VE kernel contains a patch which renames the function
1877 dnl # invalidate_inodes() to invalidate_inodes_check().  In the process
1878 dnl # it adds a 'check' argument and a '#define invalidate_inodes(x)'
1879 dnl # compatibility wrapper for legacy callers.  Therefore, if either
1880 dnl # of these functions are exported invalidate_inodes() can be
1881 dnl # safely used.
1882 dnl #
1883 AC_DEFUN([SPL_AC_KERNEL_INVALIDATE_INODES], [
1884         SPL_CHECK_SYMBOL_EXPORT(
1885                 [invalidate_inodes],
1886                 [],
1887                 [AC_DEFINE(HAVE_INVALIDATE_INODES, 1,
1888                 [invalidate_inodes() is available])],
1889                 [])
1890         SPL_CHECK_SYMBOL_EXPORT(
1891                 [invalidate_inodes_check],
1892                 [],
1893                 [AC_DEFINE(HAVE_INVALIDATE_INODES_CHECK, 1,
1894                 [invalidate_inodes_check() is available])],
1895                 [])
1896 ])
1897
1898 dnl #
1899 dnl # 2.6.39 API compat,
1900 dnl # The function invalidate_inodes() now take 2 arguments.  The second
1901 dnl # 'kill_dirty' argument describes how invalidate_inodes() should
1902 dnl # handle dirty inodes.  Only when set will dirty inodes be discarded,
1903 dnl # otherwise they will be handled as busy.
1904 dnl #
1905 dnl # Unfortunately, we don't have access to the invalidate_inodes()
1906 dnl # prototype so it's not easy to check how many arguments it takes.
1907 dnl # However, this change was done for the benefit of invalidate_device()
1908 dnl # which also added an argument.  The invalidate_device() symbol does
1909 dnl # exist in the development headers so if it takes two arguments we
1910 dnl # can fairly safely infer that invalidate_inodes() takes two arguments
1911 dnl # as well.  See commit 93b270f76e7ef3b81001576860c2701931cdc78b.
1912 dnl #
1913 AC_DEFUN([SPL_AC_KERNEL_2ARGS_INVALIDATE_INODES],
1914         [AC_MSG_CHECKING([whether invalidate_inodes() wants 2 args])
1915         SPL_LINUX_TRY_COMPILE([
1916                 #include <linux/fs.h>
1917         ],[
1918                 return __invalidate_device(NULL, 0);
1919         ],[
1920                 AC_MSG_RESULT(yes)
1921                 AC_DEFINE(HAVE_2ARGS_INVALIDATE_INODES, 1,
1922                           [invalidate_inodes() wants 2 args])
1923         ],[
1924                 AC_MSG_RESULT(no)
1925         ])
1926 ])
1927
1928 dnl #
1929 dnl # 2.6.xx API compat,
1930 dnl # There currently exists no exposed API to partially shrink the dcache.
1931 dnl # The expected mechanism to shrink the cache is a registered shrinker
1932 dnl # which is called during memory pressure.
1933 dnl #
1934 AC_DEFUN([SPL_AC_SHRINK_DCACHE_MEMORY], [
1935         SPL_CHECK_SYMBOL_EXPORT(
1936                 [shrink_dcache_memory],
1937                 [fs/dcache.c],
1938                 [AC_DEFINE(HAVE_SHRINK_DCACHE_MEMORY, 1,
1939                 [shrink_dcache_memory() is available])],
1940                 [])
1941 ])
1942
1943 dnl #
1944 dnl # 2.6.xx API compat,
1945 dnl # There currently exists no exposed API to partially shrink the icache.
1946 dnl # The expected mechanism to shrink the cache is a registered shrinker
1947 dnl # which is called during memory pressure.
1948 dnl #
1949 AC_DEFUN([SPL_AC_SHRINK_ICACHE_MEMORY], [
1950         SPL_CHECK_SYMBOL_EXPORT(
1951                 [shrink_icache_memory],
1952                 [fs/inode.c],
1953                 [AC_DEFINE(HAVE_SHRINK_ICACHE_MEMORY, 1,
1954                 [shrink_icache_memory() is available])],
1955                 [])
1956 ])
1957
1958 dnl #
1959 dnl # 2.6.39 API compat,
1960 dnl # The path_lookup() function has been renamed to kern_path_parent()
1961 dnl # and the flags argument has been removed.  The only behavior now
1962 dnl # offered is that of LOOKUP_PARENT.  The spl already always passed
1963 dnl # this flag so dropping the flag does not impact us.
1964 dnl #
1965 AC_DEFUN([SPL_AC_KERN_PATH_PARENT_HEADER], [
1966         SPL_CHECK_SYMBOL_HEADER(
1967                 [kern_path_parent],
1968                 [int kern_path_parent(const char \*, struct nameidata \*)],
1969                 [include/linux/namei.h],
1970                 [AC_DEFINE(HAVE_KERN_PATH_PARENT_HEADER, 1,
1971                 [kern_path_parent() is available])],
1972                 [])
1973 ])
1974
1975 dnl #
1976 dnl # 3.1 API compat,
1977 dnl # The kern_path_parent() symbol is no longer exported by the kernel.
1978 dnl # However, it remains the prefered interface and since we still have
1979 dnl # access to the prototype we dynamically lookup the required address.
1980 dnl #
1981 AC_DEFUN([SPL_AC_KERN_PATH_PARENT_SYMBOL], [
1982         SPL_CHECK_SYMBOL_EXPORT(
1983                 [kern_path_parent],
1984                 [fs/namei.c],
1985                 [AC_DEFINE(HAVE_KERN_PATH_PARENT_SYMBOL, 1,
1986                 [kern_path_parent() is available])],
1987                 [])
1988 ])
1989
1990 dnl #
1991 dnl # 2.6.39 API compat,
1992 dnl # The function zlib_deflate_workspacesize() now take 2 arguments.
1993 dnl # This was done to avoid always having to allocate the maximum size
1994 dnl # workspace (268K).  The caller can now specific the windowBits and
1995 dnl # memLevel compression parameters to get a smaller workspace.
1996 dnl #
1997 AC_DEFUN([SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE],
1998         [AC_MSG_CHECKING([whether zlib_deflate_workspacesize() wants 2 args])
1999         SPL_LINUX_TRY_COMPILE([
2000                 #include <linux/zlib.h>
2001         ],[
2002                 return zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL);
2003         ],[
2004                 AC_MSG_RESULT(yes)
2005                 AC_DEFINE(HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE, 1,
2006                           [zlib_deflate_workspacesize() wants 2 args])
2007         ],[
2008                 AC_MSG_RESULT(no)
2009         ])
2010 ])
2011
2012 dnl #
2013 dnl # 2.6.39 API change,
2014 dnl # Shrinker adjust to use common shrink_control structure.
2015 dnl #
2016 AC_DEFUN([SPL_AC_SHRINK_CONTROL_STRUCT], [
2017         AC_MSG_CHECKING([whether struct shrink_control exists])
2018         SPL_LINUX_TRY_COMPILE([
2019                 #include <linux/mm.h>
2020         ],[
2021                 struct shrink_control sc __attribute__ ((unused));
2022
2023                 sc.nr_to_scan = 0;
2024                 sc.gfp_mask = GFP_KERNEL;
2025         ],[
2026                 AC_MSG_RESULT(yes)
2027                 AC_DEFINE(HAVE_SHRINK_CONTROL_STRUCT, 1,
2028                         [struct shrink_control exists])
2029         ],[
2030                 AC_MSG_RESULT(no)
2031         ])
2032 ])
2033
2034 dnl #
2035 dnl # 3.1 API Change
2036 dnl #
2037 dnl # The rw_semaphore.wait_lock member was changed from spinlock_t to
2038 dnl # raw_spinlock_t at commit ddb6c9b58a19edcfac93ac670b066c836ff729f1.
2039 dnl #
2040 AC_DEFUN([SPL_AC_RWSEM_SPINLOCK_IS_RAW], [
2041         AC_MSG_CHECKING([whether struct rw_semaphore member wait_lock is raw])
2042         tmp_flags="$EXTRA_KCFLAGS"
2043         EXTRA_KCFLAGS="-Werror"
2044         SPL_LINUX_TRY_COMPILE([
2045                 #include <linux/rwsem.h>
2046         ],[
2047                 struct rw_semaphore dummy_semaphore __attribute__ ((unused));
2048                 raw_spinlock_t dummy_lock __attribute__ ((unused));
2049                 dummy_semaphore.wait_lock = dummy_lock;
2050         ],[
2051                 AC_MSG_RESULT(yes)
2052                 AC_DEFINE(RWSEM_SPINLOCK_IS_RAW, 1,
2053                 [struct rw_semaphore member wait_lock is raw_spinlock_t])
2054         ],[
2055                 AC_MSG_RESULT(no)
2056         ])
2057         EXTRA_KCFLAGS="$tmp_flags"
2058 ])