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_KMEM
  23         SPL_AC_DEBUG_KMEM_TRACKING
  24         SPL_AC_ATOMIC_SPINLOCK
  25         SPL_AC_TYPE_ATOMIC64_CMPXCHG
  26         SPL_AC_TYPE_ATOMIC64_XCHG
  27         SPL_AC_TYPE_UINTPTR_T
  28         SPL_AC_3ARGS_INIT_WORK
  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_FDTABLE_HEADER
  45         SPL_AC_FILES_FDTABLE
  46         SPL_AC_UACCESS_HEADER
  47         SPL_AC_KMALLOC_NODE
  48         SPL_AC_MONOTONIC_CLOCK
  49         SPL_AC_INODE_I_MUTEX
  50         SPL_AC_MUTEX_OWNER
  51         SPL_AC_MUTEX_LOCK_NESTED
  52         SPL_AC_3ARGS_ON_EACH_CPU
  53         SPL_AC_KALLSYMS_LOOKUP_NAME
  54         SPL_AC_GET_VMALLOC_INFO
  55         SPL_AC_PGDAT_HELPERS
  56         SPL_AC_FIRST_ONLINE_PGDAT
  57         SPL_AC_NEXT_ONLINE_PGDAT
  58         SPL_AC_NEXT_ZONE
  59         SPL_AC_PGDAT_LIST
  60         SPL_AC_GLOBAL_PAGE_STATE
  61         SPL_AC_ZONE_STAT_ITEM_FREE
  62         SPL_AC_ZONE_STAT_ITEM_INACTIVE
  63         SPL_AC_ZONE_STAT_ITEM_ACTIVE
  64         SPL_AC_GET_ZONE_COUNTS
  65         SPL_AC_USER_PATH_DIR
  66         SPL_AC_SET_FS_PWD
  67         SPL_AC_2ARGS_SET_FS_PWD
  68         SPL_AC_2ARGS_VFS_UNLINK
  69         SPL_AC_4ARGS_VFS_RENAME
  70         SPL_AC_FS_STRUCT_SPINLOCK
  71         SPL_AC_CRED_STRUCT
  72         SPL_AC_GROUPS_SEARCH
  73         SPL_AC_PUT_TASK_STRUCT
  74         SPL_AC_5ARGS_PROC_HANDLER
  75         SPL_AC_KVASPRINTF
  76         SPL_AC_3ARGS_FILE_FSYNC
  77         SPL_AC_EXPORTED_RWSEM_IS_LOCKED
  78         SPL_AC_KERNEL_INVALIDATE_INODES
  79         SPL_AC_KERNEL_2ARGS_INVALIDATE_INODES
  80         SPL_AC_SHRINK_DCACHE_MEMORY
  81         SPL_AC_SHRINK_ICACHE_MEMORY
  82 ])
  83
  84 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
  85         modpost=$LINUX/scripts/Makefile.modpost
  86         AC_MSG_CHECKING([kernel file name for module symbols])
  87         if test -f "$modpost"; then
  88                 if grep -q Modules.symvers $modpost; then
  89                         LINUX_SYMBOLS=Modules.symvers
  90                 else
  91                         LINUX_SYMBOLS=Module.symvers
  92                 fi
  93
  94                 if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
  95                         AC_MSG_ERROR([
  96         *** Please make sure the kernel devel package for your distribution
  97         *** is installed.  If your building with a custom kernel make sure the
  98         *** kernel is configured, built, and the '--with-linux=PATH' configure
  99         *** option refers to the location of the kernel source.])
 100                 fi
 101         else
 102                 LINUX_SYMBOLS=NONE
 103         fi
 104         AC_MSG_RESULT($LINUX_SYMBOLS)
 105         AC_SUBST(LINUX_SYMBOLS)
 106 ])
 107
 108 AC_DEFUN([SPL_AC_KERNEL], [
 109         AC_ARG_WITH([linux],
 110                 AS_HELP_STRING([--with-linux=PATH],
 111                 [Path to kernel source]),
 112                 [kernelsrc="$withval"])
 113
 114         AC_ARG_WITH([linux-obj],
 115                 AS_HELP_STRING([--with-linux-obj=PATH],
 116                 [Path to kernel build objects]),
 117                 [kernelbuild="$withval"])
 118
 119         AC_MSG_CHECKING([kernel source directory])
 120         if test -z "$kernelsrc"; then
 121                 if test -e "/lib/modules/$(uname -r)/source"; then
 122                         headersdir="/lib/modules/$(uname -r)/source"
 123                         sourcelink=$(readlink -f "$headersdir")
 124                 elif test -e "/lib/modules/$(uname -r)/build"; then
 125                         headersdir="/lib/modules/$(uname -r)/build"
 126                         sourcelink=$(readlink -f "$headersdir")
 127                 else
 128                         sourcelink=$(ls -1d /usr/src/kernels/* \
 129                                      /usr/src/linux-* \
 130                                      2>/dev/null | grep -v obj | tail -1)
 131                 fi
 132
 133                 if test -n "$sourcelink" && test -e ${sourcelink}; then
 134                         kernelsrc=`readlink -f ${sourcelink}`
 135                 else
 136                         AC_MSG_RESULT([Not found])
 137                         AC_MSG_ERROR([
 138         *** Please make sure the kernel devel package for your distribution
 139         *** is installed then try again.  If that fails you can specify the
 140         *** location of the kernel source with the '--with-linux=PATH' option.])
 141                 fi
 142         else
 143                 if test "$kernelsrc" = "NONE"; then
 144                         kernsrcver=NONE
 145                 fi
 146         fi
 147
 148         AC_MSG_RESULT([$kernelsrc])
 149         AC_MSG_CHECKING([kernel build directory])
 150         if test -z "$kernelbuild"; then
 151                 if test -e "/lib/modules/$(uname -r)/build"; then
 152                         kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
 153                 elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
 154                         kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
 155                 elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
 156                         kernelbuild=${kernelsrc}-obj/${target_cpu}/default
 157                 elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
 158                         kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
 159                 else
 160                         kernelbuild=${kernelsrc}
 161                 fi
 162         fi
 163         AC_MSG_RESULT([$kernelbuild])
 164
 165         AC_MSG_CHECKING([kernel source version])
 166         utsrelease1=$kernelbuild/include/linux/version.h
 167         utsrelease2=$kernelbuild/include/linux/utsrelease.h
 168         utsrelease3=$kernelbuild/include/generated/utsrelease.h
 169         if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
 170                 utsrelease=linux/version.h
 171         elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
 172                 utsrelease=linux/utsrelease.h
 173         elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
 174                 utsrelease=generated/utsrelease.h
 175         fi
 176
 177         if test "$utsrelease"; then
 178                 kernsrcver=`(echo "#include <$utsrelease>";
 179                              echo "kernsrcver=UTS_RELEASE") |
 180                              cpp -I $kernelbuild/include |
 181                              grep "^kernsrcver=" | cut -d \" -f 2`
 182
 183                 if test -z "$kernsrcver"; then
 184                         AC_MSG_RESULT([Not found])
 185                         AC_MSG_ERROR([*** Cannot determine kernel version.])
 186                 fi
 187         else
 188                 AC_MSG_RESULT([Not found])
 189                 AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
 190         fi
 191
 192         AC_MSG_RESULT([$kernsrcver])
 193
 194         LINUX=${kernelsrc}
 195         LINUX_OBJ=${kernelbuild}
 196         LINUX_VERSION=${kernsrcver}
 197
 198         AC_SUBST(LINUX)
 199         AC_SUBST(LINUX_OBJ)
 200         AC_SUBST(LINUX_VERSION)
 201
 202         SPL_AC_MODULE_SYMVERS
 203 ])
 204
 205 AC_DEFUN([SPL_AC_KERNEL_CONFIG], [
 206         SPL_LINUX_CONFIG([PREEMPT],
 207                 AC_MSG_ERROR([
 208                 *** Kernel built with CONFIG_PREEMPT which is not supported.
 209                 ** You must rebuild your kernel without this option.]), [])
 210 ])
 211
 212 dnl #
 213 dnl # Explicitly check for gawk, we require it for the the usermode
 214 dnl # helper.  For some reason the standard awk command does not
 215 dnl # behave correctly when invoked from the usermode helper.
 216 dnl #
 217 AC_DEFUN([SPL_AC_GAWK], [
 218         AS_IF([test "x$AWK" != xgawk], [
 219                 AC_MSG_ERROR([
 220         *** Required util gawk missing.  Please install the required
 221         *** gawk package for your distribution and try again.])
 222         ])
 223 ])
 224
 225 dnl #
 226 dnl # Default SPL user configuration
 227 dnl #
 228 AC_DEFUN([SPL_AC_CONFIG_USER], [
 229         SPL_AC_GAWK
 230 ])
 231
 232 dnl #
 233 dnl # Check for rpm+rpmbuild to build RPM packages.  If these tools
 234 dnl # are missing it is non-fatal but you will not be able to build
 235 dnl # RPM packages and will be warned if you try too.
 236 dnl #
 237 AC_DEFUN([SPL_AC_RPM], [
 238         RPM=rpm
 239         RPMBUILD=rpmbuild
 240
 241         AC_MSG_CHECKING([whether $RPM is available])
 242         AS_IF([tmp=$($RPM --version 2>/dev/null)], [
 243                 RPM_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
 244                 HAVE_RPM=yes
 245                 AC_MSG_RESULT([$HAVE_RPM ($RPM_VERSION)])
 246         ],[
 247                 HAVE_RPM=no
 248                 AC_MSG_RESULT([$HAVE_RPM])
 249         ])
 250
 251         AC_MSG_CHECKING([whether $RPMBUILD is available])
 252         AS_IF([tmp=$($RPMBUILD --version 2>/dev/null)], [
 253                 RPMBUILD_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
 254                 HAVE_RPMBUILD=yes
 255                 AC_MSG_RESULT([$HAVE_RPMBUILD ($RPMBUILD_VERSION)])
 256         ],[
 257                 HAVE_RPMBUILD=no
 258                 AC_MSG_RESULT([$HAVE_RPMBUILD])
 259         ])
 260
 261         AC_SUBST(HAVE_RPM)
 262         AC_SUBST(RPM)
 263         AC_SUBST(RPM_VERSION)
 264
 265         AC_SUBST(HAVE_RPMBUILD)
 266         AC_SUBST(RPMBUILD)
 267         AC_SUBST(RPMBUILD_VERSION)
 268 ])
 269
 270 dnl #
 271 dnl # Check for dpkg+dpkg-buildpackage to build DEB packages.  If these
 272 dnl # tools are missing it is non-fatal but you will not be able to build
 273 dnl # DEB packages and will be warned if you try too.
 274 dnl #
 275 AC_DEFUN([SPL_AC_DPKG], [
 276         DPKG=dpkg
 277         DPKGBUILD=dpkg-buildpackage
 278
 279         AC_MSG_CHECKING([whether $DPKG is available])
 280         AS_IF([tmp=$($DPKG --version 2>/dev/null)], [
 281                 DPKG_VERSION=$(echo $tmp | $AWK '/Debian/ { print $[7] }')
 282                 HAVE_DPKG=yes
 283                 AC_MSG_RESULT([$HAVE_DPKG ($DPKG_VERSION)])
 284         ],[
 285                 HAVE_DPKG=no
 286                 AC_MSG_RESULT([$HAVE_DPKG])
 287         ])
 288
 289         AC_MSG_CHECKING([whether $DPKGBUILD is available])
 290         AS_IF([tmp=$($DPKGBUILD --version 2>/dev/null)], [
 291                 DPKGBUILD_VERSION=$(echo $tmp | \
 292                     $AWK '/Debian/ { print $[4] }' | cut -f-4 -d'.')
 293                 HAVE_DPKGBUILD=yes
 294                 AC_MSG_RESULT([$HAVE_DPKGBUILD ($DPKGBUILD_VERSION)])
 295         ],[
 296                 HAVE_DPKGBUILD=no
 297                 AC_MSG_RESULT([$HAVE_DPKGBUILD])
 298         ])
 299
 300         AC_SUBST(HAVE_DPKG)
 301         AC_SUBST(DPKG)
 302         AC_SUBST(DPKG_VERSION)
 303
 304         AC_SUBST(HAVE_DPKGBUILD)
 305         AC_SUBST(DPKGBUILD)
 306         AC_SUBST(DPKGBUILD_VERSION)
 307 ])
 308
 309 dnl #
 310 dnl # Until native packaging for various different packing systems
 311 dnl # can be added the least we can do is attempt to use alien to
 312 dnl # convert the RPM packages to the needed package type.  This is
 313 dnl # a hack but so far it has worked reasonable well.
 314 dnl #
 315 AC_DEFUN([SPL_AC_ALIEN], [
 316         ALIEN=alien
 317
 318         AC_MSG_CHECKING([whether $ALIEN is available])
 319         AS_IF([tmp=$($ALIEN --version 2>/dev/null)], [
 320                 ALIEN_VERSION=$(echo $tmp | $AWK '{ print $[3] }')
 321                 HAVE_ALIEN=yes
 322                 AC_MSG_RESULT([$HAVE_ALIEN ($ALIEN_VERSION)])
 323         ],[
 324                 HAVE_ALIEN=no
 325                 AC_MSG_RESULT([$HAVE_ALIEN])
 326         ])
 327
 328         AC_SUBST(HAVE_ALIEN)
 329         AC_SUBST(ALIEN)
 330         AC_SUBST(ALIEN_VERSION)
 331 ])
 332
 333 dnl #
 334 dnl # Using the VENDOR tag from config.guess set the default
 335 dnl # package type for 'make pkg': (rpm | deb | tgz)
 336 dnl #
 337 AC_DEFUN([SPL_AC_DEFAULT_PACKAGE], [
 338         AC_MSG_CHECKING([linux distribution])
 339         if test -f /etc/redhat-release ; then
 340                 VENDOR=redhat ;
 341         elif test -f /etc/fedora-release ; then
 342                 VENDOR=fedora ;
 343         elif test -f /etc/lsb-release ; then
 344                 VENDOR=ubuntu ;
 345         elif test -f /etc/debian_version ; then
 346                 VENDOR=debian ;
 347         elif test -f /etc/SuSE-release ; then
 348                 VENDOR=sles ;
 349         elif test -f /etc/slackware-version ; then
 350                 VENDOR=slackware ;
 351         elif test -f /etc/gentoo-release ; then
 352                 VENDOR=gentoo ;
 353         else
 354                 VENDOR= ;
 355         fi
 356         AC_MSG_RESULT([$VENDOR])
 357         AC_SUBST(VENDOR)
 358
 359         AC_MSG_CHECKING([default package type])
 360         case "$VENDOR" in
 361                 fedora)     DEFAULT_PACKAGE=rpm ;;
 362                 redhat)     DEFAULT_PACKAGE=rpm ;;
 363                 sles)       DEFAULT_PACKAGE=rpm ;;
 364                 ubuntu)     DEFAULT_PACKAGE=deb ;;
 365                 debian)     DEFAULT_PACKAGE=deb ;;
 366                 slackware)  DEFAULT_PACKAGE=tgz ;;
 367                 *)          DEFAULT_PACKAGE=rpm ;;
 368         esac
 369
 370         AC_MSG_RESULT([$DEFAULT_PACKAGE])
 371         AC_SUBST(DEFAULT_PACKAGE)
 372 ])
 373
 374 dnl #
 375 dnl # Default SPL user configuration
 376 dnl #
 377 AC_DEFUN([SPL_AC_PACKAGE], [
 378         SPL_AC_RPM
 379         SPL_AC_DPKG
 380         SPL_AC_ALIEN
 381         SPL_AC_DEFAULT_PACKAGE
 382 ])
 383
 384 AC_DEFUN([SPL_AC_LICENSE], [
 385         AC_MSG_CHECKING([spl license])
 386         LICENSE=GPL
 387         AC_MSG_RESULT([$LICENSE])
 388         KERNELCPPFLAGS="${KERNELCPPFLAGS} -DHAVE_GPL_ONLY_SYMBOLS"
 389         AC_SUBST(LICENSE)
 390 ])
 391
 392 AC_DEFUN([SPL_AC_CONFIG], [
 393         SPL_CONFIG=all
 394         AC_ARG_WITH([config],
 395                 AS_HELP_STRING([--with-config=CONFIG],
 396                 [Config file 'kernel|user|all|srpm']),
 397                 [SPL_CONFIG="$withval"])
 398
 399         AC_MSG_CHECKING([spl config])
 400         AC_MSG_RESULT([$SPL_CONFIG]);
 401         AC_SUBST(SPL_CONFIG)
 402
 403         case "$SPL_CONFIG" in
 404                 kernel) SPL_AC_CONFIG_KERNEL ;;
 405                 user)   SPL_AC_CONFIG_USER   ;;
 406                 all)    SPL_AC_CONFIG_KERNEL
 407                         SPL_AC_CONFIG_USER   ;;
 408                 srpm)                        ;;
 409                 *)
 410                 AC_MSG_RESULT([Error!])
 411                 AC_MSG_ERROR([Bad value "$SPL_CONFIG" for --with-config,
 412                               user kernel|user|all|srpm]) ;;
 413         esac
 414
 415         AM_CONDITIONAL([CONFIG_USER],
 416                        [test "$SPL_CONFIG" = user] ||
 417                        [test "$SPL_CONFIG" = all])
 418         AM_CONDITIONAL([CONFIG_KERNEL],
 419                        [test "$SPL_CONFIG" = kernel] ||
 420                        [test "$SPL_CONFIG" = all])
 421 ])
 422
 423 dnl #
 424 dnl # Enable if the SPL should be compiled with internal debugging enabled.
 425 dnl # By default this support is disabled.
 426 dnl #
 427 AC_DEFUN([SPL_AC_DEBUG], [
 428         AC_MSG_CHECKING([whether debugging is enabled])
 429         AC_ARG_ENABLE([debug],
 430                 [AS_HELP_STRING([--enable-debug],
 431                 [Enable generic debug support @<:@default=no@:>@])],
 432                 [],
 433                 [enable_debug=no])
 434
 435         AS_IF([test "x$enable_debug" = xyes],
 436         [
 437                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG -Werror"
 438                 DEBUG_CFLAGS="-DDEBUG -Werror"
 439         ],
 440         [
 441                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DNDEBUG"
 442                 DEBUG_CFLAGS="-DNDEBUG"
 443         ])
 444
 445         AC_SUBST(DEBUG_CFLAGS)
 446         AC_MSG_RESULT([$enable_debug])
 447 ])
 448
 449 dnl #
 450 dnl # Enabled by default it provides a minimal level of memory tracking.
 451 dnl # A total count of bytes allocated is kept for each alloc and free.
 452 dnl # Then at module unload time a report to the console will be printed
 453 dnl # if memory was leaked.  Additionally, /proc/spl/kmem/slab will exist
 454 dnl # and provide an easy way to inspect the kmem based slab.
 455 dnl #
 456 AC_DEFUN([SPL_AC_DEBUG_KMEM], [
 457         AC_ARG_ENABLE([debug-kmem],
 458                 [AS_HELP_STRING([--enable-debug-kmem],
 459                 [Enable basic kmem accounting @<:@default=yes@:>@])],
 460                 [],
 461                 [enable_debug_kmem=yes])
 462
 463         AS_IF([test "x$enable_debug_kmem" = xyes],
 464                 [AC_DEFINE([DEBUG_KMEM], [1],
 465                 [Define to 1 to enable basic kmem accounting])
 466                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM"])
 467
 468         AC_MSG_CHECKING([whether basic kmem accounting is enabled])
 469         AC_MSG_RESULT([$enable_debug_kmem])
 470 ])
 471
 472 dnl #
 473 dnl # Disabled by default it provides detailed memory tracking.  This
 474 dnl # feature also requires --enable-debug-kmem to be set.  When enabled
 475 dnl # not only will total bytes be tracked but also the location of every
 476 dnl # alloc and free.  When the SPL module is unloaded a list of all leaked
 477 dnl # addresses and where they were allocated will be dumped to the console.
 478 dnl # Enabling this feature has a significant impact on performance but it
 479 dnl # makes finding memory leaks pretty straight forward.
 480 dnl #
 481 AC_DEFUN([SPL_AC_DEBUG_KMEM_TRACKING], [
 482         AC_ARG_ENABLE([debug-kmem-tracking],
 483                 [AS_HELP_STRING([--enable-debug-kmem-tracking],
 484                 [Enable detailed kmem tracking  @<:@default=no@:>@])],
 485                 [],
 486                 [enable_debug_kmem_tracking=no])
 487
 488         AS_IF([test "x$enable_debug_kmem_tracking" = xyes],
 489                 [AC_DEFINE([DEBUG_KMEM_TRACKING], [1],
 490                 [Define to 1 to enable detailed kmem tracking])
 491                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM_TRACKING"])
 492
 493         AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
 494         AC_MSG_RESULT([$enable_debug_kmem_tracking])
 495 ])
 496
 497 dnl #
 498 dnl # SPL_LINUX_CONFTEST
 499 dnl #
 500 AC_DEFUN([SPL_LINUX_CONFTEST], [
 501 cat confdefs.h - <<_ACEOF >conftest.c
 502 $1
 503 _ACEOF
 504 ])
 505
 506 dnl #
 507 dnl # SPL_LANG_PROGRAM(C)([PROLOGUE], [BODY])
 508 dnl #
 509 m4_define([SPL_LANG_PROGRAM], [
 510 $1
 511 int
 512 main (void)
 513 {
 514 dnl Do *not* indent the following line: there may be CPP directives.
 515 dnl Don't move the `;' right after for the same reason.
 516 $2
 517   ;
 518   return 0;
 519 }
 520 ])
 521
 522 dnl #
 523 dnl # SPL_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
 524 dnl #
 525 AC_DEFUN([SPL_LINUX_COMPILE_IFELSE], [
 526         m4_ifvaln([$1], [SPL_LINUX_CONFTEST([$1])])
 527         rm -Rf build && mkdir -p build
 528         echo "obj-m := conftest.o" >build/Makefile
 529         AS_IF(
 530                 [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])],
 531                 [$4],
 532                 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
 533         )
 534         rm -Rf build
 535 ])
 536
 537 dnl #
 538 dnl # SPL_LINUX_TRY_COMPILE like AC_TRY_COMPILE
 539 dnl #
 540 AC_DEFUN([SPL_LINUX_TRY_COMPILE],
 541         [SPL_LINUX_COMPILE_IFELSE(
 542         [AC_LANG_SOURCE([SPL_LANG_PROGRAM([[$1]], [[$2]])])],
 543         [modules],
 544         [test -s build/conftest.o],
 545         [$3], [$4])
 546 ])
 547
 548 dnl #
 549 dnl # SPL_LINUX_CONFIG
 550 dnl #
 551 AC_DEFUN([SPL_LINUX_CONFIG],
 552         [AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
 553         SPL_LINUX_TRY_COMPILE([
 554                 #ifndef AUTOCONF_INCLUDED
 555                 #include <linux/config.h>
 556                 #endif
 557         ],[
 558                 #ifndef CONFIG_$1
 559                 #error CONFIG_$1 not #defined
 560                 #endif
 561         ],[
 562                 AC_MSG_RESULT([yes])
 563                 $2
 564         ],[
 565                 AC_MSG_RESULT([no])
 566                 $3
 567         ])
 568 ])
 569
 570 dnl #
 571 dnl # SPL_CHECK_SYMBOL_EXPORT
 572 dnl # check symbol exported or not
 573 dnl #
 574 AC_DEFUN([SPL_CHECK_SYMBOL_EXPORT],
 575         [AC_MSG_CHECKING([whether symbol $1 is exported])
 576         grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
 577                 $LINUX_OBJ/Module*.symvers 2>/dev/null
 578         rc=$?
 579         if test $rc -ne 0; then
 580                 export=0
 581                 for file in $2; do
 582                         grep -q -E "EXPORT_SYMBOL.*($1)" \
 583                                 "$LINUX_OBJ/$file" 2>/dev/null
 584                         rc=$?
 585                         if test $rc -eq 0; then
 586                                 export=1
 587                                 break;
 588                         fi
 589                 done
 590                 if test $export -eq 0; then
 591                         AC_MSG_RESULT([no])
 592                         $4
 593                 else
 594                         AC_MSG_RESULT([yes])
 595                         $3
 596                 fi
 597         else
 598                 AC_MSG_RESULT([yes])
 599                 $3
 600         fi
 601 ])
 602
 603 dnl #
 604 dnl # SPL_CHECK_HEADER
 605 dnl # check whether header exists and define HAVE_$2_HEADER
 606 dnl #
 607 AC_DEFUN([SPL_CHECK_HEADER],
 608         [AC_MSG_CHECKING([whether header $1 exists])
 609         SPL_LINUX_TRY_COMPILE([
 610                 #include <$1>
 611         ],[
 612                 return 0;
 613         ],[
 614                 AC_DEFINE(HAVE_$2_HEADER, 1, [$1 exists])
 615                 AC_MSG_RESULT(yes)
 616                 $3
 617         ],[
 618                 AC_MSG_RESULT(no)
 619                 $4
 620         ])
 621 ])
 622
 623 dnl #
 624 dnl # Use the atomic implemenation based on global spinlocks.  This
 625 dnl # should only be needed by 32-bit kernels which do not provide
 626 dnl # the atomic64_* API.  It may be optionally enabled as a fallback
 627 dnl # if problems are observed with the direct mapping to the native
 628 dnl # Linux atomic operations.  You may not disable atomic spinlocks
 629 dnl # if you kernel does not an atomic64_* API.
 630 dnl #
 631 AC_DEFUN([SPL_AC_ATOMIC_SPINLOCK], [
 632         AC_ARG_ENABLE([atomic-spinlocks],
 633                 [AS_HELP_STRING([--enable-atomic-spinlocks],
 634                 [Atomic types use spinlocks @<:@default=check@:>@])],
 635                 [],
 636                 [enable_atomic_spinlocks=check])
 637
 638         SPL_LINUX_TRY_COMPILE([
 639                 #include <asm/atomic.h>
 640         ],[
 641                 atomic64_t *ptr __attribute__ ((unused));
 642         ],[
 643                 have_atomic64_t=yes
 644                 AC_DEFINE(HAVE_ATOMIC64_T, 1,
 645                         [kernel defines atomic64_t])
 646         ],[
 647                 have_atomic64_t=no
 648         ])
 649
 650         AS_IF([test "x$enable_atomic_spinlocks" = xcheck], [
 651                 AS_IF([test "x$have_atomic64_t" = xyes], [
 652                         enable_atomic_spinlocks=no
 653                 ],[
 654                         enable_atomic_spinlocks=yes
 655                 ])
 656         ])
 657
 658         AS_IF([test "x$enable_atomic_spinlocks" = xyes], [
 659                 AC_DEFINE([ATOMIC_SPINLOCK], [1],
 660                         [Atomic types use spinlocks])
 661         ],[
 662                 AS_IF([test "x$have_atomic64_t" = xno], [
 663                         AC_MSG_FAILURE(
 664                         [--disable-atomic-spinlocks given but required atomic64 support is unavailable])
 665                 ])
 666         ])
 667
 668         AC_MSG_CHECKING([whether atomic types use spinlocks])
 669         AC_MSG_RESULT([$enable_atomic_spinlocks])
 670
 671         AC_MSG_CHECKING([whether kernel defines atomic64_t])
 672         AC_MSG_RESULT([$have_atomic64_t])
 673 ])
 674
 675 dnl #
 676 dnl # 2.6.24 API change,
 677 dnl # check if atomic64_cmpxchg is defined
 678 dnl #
 679 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_CMPXCHG],
 680         [AC_MSG_CHECKING([whether kernel defines atomic64_cmpxchg])
 681         SPL_LINUX_TRY_COMPILE([
 682                 #include <asm/atomic.h>
 683                 #include <asm/system.h>
 684         ],[
 685                 atomic64_cmpxchg((atomic64_t *)NULL, 0, 0);
 686         ],[
 687                 AC_MSG_RESULT([yes])
 688                 AC_DEFINE(HAVE_ATOMIC64_CMPXCHG, 1,
 689                           [kernel defines atomic64_cmpxchg])
 690         ],[
 691                 AC_MSG_RESULT([no])
 692         ])
 693 ])
 694
 695 dnl #
 696 dnl # 2.6.24 API change,
 697 dnl # check if atomic64_xchg is defined
 698 dnl #
 699 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_XCHG],
 700         [AC_MSG_CHECKING([whether kernel defines atomic64_xchg])
 701         SPL_LINUX_TRY_COMPILE([
 702                 #include <asm/atomic.h>
 703         ],[
 704                 atomic64_xchg((atomic64_t *)NULL, 0);
 705         ],[
 706                 AC_MSG_RESULT([yes])
 707                 AC_DEFINE(HAVE_ATOMIC64_XCHG, 1,
 708                           [kernel defines atomic64_xchg])
 709         ],[
 710                 AC_MSG_RESULT([no])
 711         ])
 712 ])
 713
 714 dnl #
 715 dnl # 2.6.24 API change,
 716 dnl # check if uintptr_t typedef is defined
 717 dnl #
 718 AC_DEFUN([SPL_AC_TYPE_UINTPTR_T],
 719         [AC_MSG_CHECKING([whether kernel defines uintptr_t])
 720         SPL_LINUX_TRY_COMPILE([
 721                 #include <linux/types.h>
 722         ],[
 723                 uintptr_t *ptr __attribute__ ((unused));
 724         ],[
 725                 AC_MSG_RESULT([yes])
 726                 AC_DEFINE(HAVE_UINTPTR_T, 1,
 727                           [kernel defines uintptr_t])
 728         ],[
 729                 AC_MSG_RESULT([no])
 730         ])
 731 ])
 732
 733 dnl #
 734 dnl # 2.6.20 API change,
 735 dnl # INIT_WORK use 2 args and not store data inside
 736 dnl #
 737 AC_DEFUN([SPL_AC_3ARGS_INIT_WORK],
 738         [AC_MSG_CHECKING([whether INIT_WORK wants 3 args])
 739         SPL_LINUX_TRY_COMPILE([
 740                 #include <linux/workqueue.h>
 741         ],[
 742                 struct work_struct work __attribute__ ((unused));
 743                 INIT_WORK(&work, NULL, NULL);
 744         ],[
 745                 AC_MSG_RESULT(yes)
 746                 AC_DEFINE(HAVE_3ARGS_INIT_WORK, 1,
 747                           [INIT_WORK wants 3 args])
 748         ],[
 749                 AC_MSG_RESULT(no)
 750         ])
 751 ])
 752
 753 dnl #
 754 dnl # 2.6.21 API change,
 755 dnl # 'register_sysctl_table' use only one argument instead of two
 756 dnl #
 757 AC_DEFUN([SPL_AC_2ARGS_REGISTER_SYSCTL],
 758         [AC_MSG_CHECKING([whether register_sysctl_table() wants 2 args])
 759         SPL_LINUX_TRY_COMPILE([
 760                 #include <linux/sysctl.h>
 761         ],[
 762                 (void) register_sysctl_table(NULL, 0);
 763         ],[
 764                 AC_MSG_RESULT(yes)
 765                 AC_DEFINE(HAVE_2ARGS_REGISTER_SYSCTL, 1,
 766                           [register_sysctl_table() wants 2 args])
 767         ],[
 768                 AC_MSG_RESULT(no)
 769         ])
 770 ])
 771
 772 dnl #
 773 dnl # 2.6.23 API change
 774 dnl # Old set_shrinker API replaced with register_shrinker
 775 dnl #
 776 AC_DEFUN([SPL_AC_SET_SHRINKER], [
 777         AC_MSG_CHECKING([whether set_shrinker() available])
 778         SPL_LINUX_TRY_COMPILE([
 779                 #include <linux/mm.h>
 780         ],[
 781                 return set_shrinker(DEFAULT_SEEKS, NULL);
 782         ],[
 783                 AC_MSG_RESULT([yes])
 784                 AC_DEFINE(HAVE_SET_SHRINKER, 1,
 785                           [set_shrinker() available])
 786         ],[
 787                 AC_MSG_RESULT([no])
 788         ])
 789 ])
 790
 791 dnl #
 792 dnl # 2.6.35 API change,
 793 dnl # Add context to shrinker callback
 794 dnl #
 795 AC_DEFUN([SPL_AC_3ARGS_SHRINKER_CALLBACK],
 796         [AC_MSG_CHECKING([whether shrinker callback wants 3 args])
 797         tmp_flags="$EXTRA_KCFLAGS"
 798         EXTRA_KCFLAGS="-Werror"
 799         SPL_LINUX_TRY_COMPILE([
 800                 #include <linux/mm.h>
 801
 802                 int shrinker_cb(struct shrinker *, int, unsigned int);
 803         ],[
 804                 struct shrinker cache_shrinker = {
 805                         .shrink = shrinker_cb,
 806                         .seeks = DEFAULT_SEEKS,
 807                 };
 808                 register_shrinker(&cache_shrinker);
 809         ],[
 810                 AC_MSG_RESULT(yes)
 811                 AC_DEFINE(HAVE_3ARGS_SHRINKER_CALLBACK, 1,
 812                           [shrinker callback wants 3 args])
 813         ],[
 814                 AC_MSG_RESULT(no)
 815         ])
 816         EXTRA_KCFLAGS="$tmp_flags"
 817 ])
 818
 819 dnl #
 820 dnl # 2.6.25 API change,
 821 dnl # struct path entry added to struct nameidata
 822 dnl #
 823 AC_DEFUN([SPL_AC_PATH_IN_NAMEIDATA],
 824         [AC_MSG_CHECKING([whether struct path used in struct nameidata])
 825         SPL_LINUX_TRY_COMPILE([
 826                 #include <linux/namei.h>
 827         ],[
 828                 struct nameidata nd __attribute__ ((unused));
 829
 830                 nd.path.mnt = NULL;
 831                 nd.path.dentry = NULL;
 832         ],[
 833                 AC_MSG_RESULT(yes)
 834                 AC_DEFINE(HAVE_PATH_IN_NAMEIDATA, 1,
 835                           [struct path used in struct nameidata])
 836         ],[
 837                 AC_MSG_RESULT(no)
 838         ])
 839 ])
 840
 841 dnl #
 842 dnl # Custom SPL patch may export this system it is not required
 843 dnl #
 844 AC_DEFUN([SPL_AC_TASK_CURR], [
 845         SPL_CHECK_SYMBOL_EXPORT([task_curr], [kernel/sched.c],
 846                 [AC_DEFINE(HAVE_TASK_CURR, 1, [task_curr() exported])],
 847                 [])
 848 ])
 849
 850 dnl #
 851 dnl # 2.6.19 API change,
 852 dnl # Use CTL_UNNUMBERED when binary sysctl is not required
 853 dnl #
 854 AC_DEFUN([SPL_AC_CTL_UNNUMBERED],
 855         [AC_MSG_CHECKING([whether unnumbered sysctl support exists])
 856         SPL_LINUX_TRY_COMPILE([
 857                 #include <linux/sysctl.h>
 858         ],[
 859                 #ifndef CTL_UNNUMBERED
 860                 #error CTL_UNNUMBERED undefined
 861                 #endif
 862         ],[
 863                 AC_MSG_RESULT(yes)
 864                 AC_DEFINE(HAVE_CTL_UNNUMBERED, 1,
 865                           [unnumbered sysctl support exists])
 866         ],[
 867                 AC_MSG_RESULT(no)
 868         ])
 869 ])
 870
 871 dnl #
 872 dnl # 2.6.33 API change,
 873 dnl # Removed .ctl_name from struct ctl_table.
 874 dnl #
 875 AC_DEFUN([SPL_AC_CTL_NAME], [
 876         AC_MSG_CHECKING([whether struct ctl_table has ctl_name])
 877         SPL_LINUX_TRY_COMPILE([
 878                 #include <linux/sysctl.h>
 879         ],[
 880                 struct ctl_table ctl __attribute__ ((unused));
 881                 ctl.ctl_name = 0;
 882         ],[
 883                 AC_MSG_RESULT(yes)
 884                 AC_DEFINE(HAVE_CTL_NAME, 1, [struct ctl_table has ctl_name])
 885         ],[
 886                 AC_MSG_RESULT(no)
 887         ])
 888 ])
 889
 890 dnl #
 891 dnl # 2.6.16 API change.
 892 dnl # Check if 'fls64()' is available
 893 dnl #
 894 AC_DEFUN([SPL_AC_FLS64],
 895         [AC_MSG_CHECKING([whether fls64() is available])
 896         SPL_LINUX_TRY_COMPILE([
 897                 #include <linux/bitops.h>
 898         ],[
 899                 return fls64(0);
 900         ],[
 901                 AC_MSG_RESULT(yes)
 902                 AC_DEFINE(HAVE_FLS64, 1, [fls64() is available])
 903         ],[
 904                 AC_MSG_RESULT(no)
 905         ])
 906 ])
 907
 908 dnl #
 909 dnl # 2.6.18 API change, check whether device_create() is available.
 910 dnl # Device_create() was introduced in 2.6.18 and depricated
 911 dnl # class_device_create() which was fully removed in 2.6.26.
 912 dnl #
 913 AC_DEFUN([SPL_AC_DEVICE_CREATE], [
 914         SPL_CHECK_SYMBOL_EXPORT(
 915                 [device_create],
 916                 [drivers/base/core.c],
 917                 [AC_DEFINE(HAVE_DEVICE_CREATE, 1,
 918                 [device_create() is available])],
 919                 [])
 920 ])
 921
 922 dnl #
 923 dnl # 2.6.27 API change,
 924 dnl # device_create() uses 5 args, new 'drvdata' argument.
 925 dnl #
 926 AC_DEFUN([SPL_AC_5ARGS_DEVICE_CREATE], [
 927         AC_MSG_CHECKING([whether device_create() wants 5 args])
 928         tmp_flags="$EXTRA_KCFLAGS"
 929         EXTRA_KCFLAGS="-Werror"
 930         SPL_LINUX_TRY_COMPILE([
 931                 #include <linux/device.h>
 932         ],[
 933                 device_create(NULL, NULL, 0, NULL, "%d", 1);
 934         ],[
 935                 AC_MSG_RESULT(yes)
 936                 AC_DEFINE(HAVE_5ARGS_DEVICE_CREATE, 1,
 937                           [device_create wants 5 args])
 938         ],[
 939                 AC_MSG_RESULT(no)
 940         ])
 941         EXTRA_KCFLAGS="$tmp_flags"
 942 ])
 943
 944 dnl #
 945 dnl # 2.6.13 API change, check whether class_device_create() is available.
 946 dnl # Class_device_create() was introduced in 2.6.13 and depricated
 947 dnl # class_simple_device_add() which was fully removed in 2.6.13.
 948 dnl #
 949 AC_DEFUN([SPL_AC_CLASS_DEVICE_CREATE], [
 950         SPL_CHECK_SYMBOL_EXPORT(
 951                 [class_device_create],
 952                 [drivers/base/class.c],
 953                 [AC_DEFINE(HAVE_CLASS_DEVICE_CREATE, 1,
 954                 [class_device_create() is available])],
 955                 [])
 956 ])
 957
 958 dnl #
 959 dnl # 2.6.26 API change, set_normalized_timespec() is exported.
 960 dnl #
 961 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT], [
 962         SPL_CHECK_SYMBOL_EXPORT(
 963                 [set_normalized_timespec],
 964                 [kernel/time.c],
 965                 [AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_EXPORT, 1,
 966                 [set_normalized_timespec() is available as export])],
 967                 [])
 968 ])
 969
 970 dnl #
 971 dnl # 2.6.16 API change, set_normalize_timespec() moved to time.c
 972 dnl # previously it was available in time.h as an inline.
 973 dnl #
 974 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE], [
 975         AC_MSG_CHECKING([whether set_normalized_timespec() is an inline])
 976         SPL_LINUX_TRY_COMPILE([
 977                 #include <linux/time.h>
 978                 void set_normalized_timespec(struct timespec *ts,
 979                                              time_t sec, long nsec) { }
 980         ],
 981         [],
 982         [
 983                 AC_MSG_RESULT(no)
 984         ],[
 985                 AC_MSG_RESULT(yes)
 986                 AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_INLINE, 1,
 987                           [set_normalized_timespec() is available as inline])
 988         ])
 989 ])
 990
 991 dnl #
 992 dnl # 2.6.18 API change,
 993 dnl # timespec_sub() inline function available in linux/time.h
 994 dnl #
 995 AC_DEFUN([SPL_AC_TIMESPEC_SUB], [
 996         AC_MSG_CHECKING([whether timespec_sub() is available])
 997         SPL_LINUX_TRY_COMPILE([
 998                 #include <linux/time.h>
 999         ],[
1000                 struct timespec a = { 0 };
1001                 struct timespec b = { 0 };
1002                 struct timespec c __attribute__ ((unused));
1003                 c = timespec_sub(a, b);
1004         ],[
1005                 AC_MSG_RESULT(yes)
1006                 AC_DEFINE(HAVE_TIMESPEC_SUB, 1, [timespec_sub() is available])
1007         ],[
1008                 AC_MSG_RESULT(no)
1009         ])
1010 ])
1011
1012 dnl #
1013 dnl # 2.6.19 API change,
1014 dnl # check if init_utsname() is available in linux/utsname.h
1015 dnl #
1016 AC_DEFUN([SPL_AC_INIT_UTSNAME], [
1017         AC_MSG_CHECKING([whether init_utsname() is available])
1018         SPL_LINUX_TRY_COMPILE([
1019                 #include <linux/utsname.h>
1020         ],[
1021                 struct new_utsname *a __attribute__ ((unused));
1022                 a = init_utsname();
1023         ],[
1024                 AC_MSG_RESULT(yes)
1025                 AC_DEFINE(HAVE_INIT_UTSNAME, 1, [init_utsname() is available])
1026         ],[
1027                 AC_MSG_RESULT(no)
1028         ])
1029 ])
1030
1031 dnl #
1032 dnl # 2.6.26 API change,
1033 dnl # definition of struct fdtable relocated to linux/fdtable.h
1034 dnl #
1035 AC_DEFUN([SPL_AC_FDTABLE_HEADER], [
1036         SPL_CHECK_HEADER([linux/fdtable.h], [FDTABLE], [], [])
1037 ])
1038
1039 dnl #
1040 dnl # 2.6.14 API change,
1041 dnl # check whether 'files_fdtable()' exists
1042 dnl #
1043 AC_DEFUN([SPL_AC_FILES_FDTABLE], [
1044         AC_MSG_CHECKING([whether files_fdtable() is available])
1045         SPL_LINUX_TRY_COMPILE([
1046                 #include <linux/sched.h>
1047                 #include <linux/file.h>
1048                 #ifdef HAVE_FDTABLE_HEADER
1049                 #include <linux/fdtable.h>
1050                 #endif
1051         ],[
1052                 struct files_struct *files = current->files;
1053                 struct fdtable *fdt __attribute__ ((unused));
1054                 fdt = files_fdtable(files);
1055         ],[
1056                 AC_MSG_RESULT(yes)
1057                 AC_DEFINE(HAVE_FILES_FDTABLE, 1, [files_fdtable() is available])
1058         ],[
1059                 AC_MSG_RESULT(no)
1060         ])
1061 ])
1062
1063 dnl #
1064 dnl # 2.6.18 API change,
1065 dnl # added linux/uaccess.h
1066 dnl #
1067 AC_DEFUN([SPL_AC_UACCESS_HEADER], [
1068         SPL_CHECK_HEADER([linux/uaccess.h], [UACCESS], [], [])
1069 ])
1070
1071 dnl #
1072 dnl # 2.6.12 API change,
1073 dnl # check whether 'kmalloc_node()' is available.
1074 dnl #
1075 AC_DEFUN([SPL_AC_KMALLOC_NODE], [
1076         AC_MSG_CHECKING([whether kmalloc_node() is available])
1077         SPL_LINUX_TRY_COMPILE([
1078                 #include <linux/slab.h>
1079         ],[
1080                 void *a __attribute__ ((unused));
1081                 a = kmalloc_node(1, GFP_KERNEL, 0);
1082         ],[
1083                 AC_MSG_RESULT(yes)
1084                 AC_DEFINE(HAVE_KMALLOC_NODE, 1, [kmalloc_node() is available])
1085         ],[
1086                 AC_MSG_RESULT(no)
1087         ])
1088 ])
1089
1090 dnl #
1091 dnl # 2.6.9 API change,
1092 dnl # check whether 'monotonic_clock()' is available it may
1093 dnl # be available for some archs but not others.
1094 dnl #
1095 AC_DEFUN([SPL_AC_MONOTONIC_CLOCK], [
1096         SPL_CHECK_SYMBOL_EXPORT(
1097                 [monotonic_clock],
1098                 [],
1099                 [AC_DEFINE(HAVE_MONOTONIC_CLOCK, 1,
1100                 [monotonic_clock() is available])],
1101                 [])
1102 ])
1103
1104 dnl #
1105 dnl # 2.6.16 API change,
1106 dnl # check whether 'struct inode' has i_mutex
1107 dnl #
1108 AC_DEFUN([SPL_AC_INODE_I_MUTEX], [
1109         AC_MSG_CHECKING([whether struct inode has i_mutex])
1110         SPL_LINUX_TRY_COMPILE([
1111                 #include <linux/fs.h>
1112                 #include <linux/mutex.h>
1113         ],[
1114                 struct inode i;
1115                 mutex_init(&i.i_mutex);
1116         ],[
1117                 AC_MSG_RESULT(yes)
1118                 AC_DEFINE(HAVE_INODE_I_MUTEX, 1, [struct inode has i_mutex])
1119         ],[
1120                 AC_MSG_RESULT(no)
1121         ])
1122 ])
1123
1124 dnl #
1125 dnl # 2.6.29 API change,
1126 dnl # Adaptive mutexs introduced.
1127 dnl #
1128 AC_DEFUN([SPL_AC_MUTEX_OWNER], [
1129         AC_MSG_CHECKING([whether struct mutex has owner])
1130         SPL_LINUX_TRY_COMPILE([
1131                 #include <linux/mutex.h>
1132         ],[
1133                 struct mutex mtx __attribute__ ((unused));
1134                 mtx.owner = NULL;
1135         ],[
1136                 AC_MSG_RESULT(yes)
1137                 AC_DEFINE(HAVE_MUTEX_OWNER, 1, [struct mutex has owner])
1138         ],[
1139                 AC_MSG_RESULT(no)
1140         ])
1141 ])
1142
1143 dnl #
1144 dnl # 2.6.18 API change,
1145 dnl # First introduced 'mutex_lock_nested()' in include/linux/mutex.h,
1146 dnl # as part of the mutex validator.  Fallback to using 'mutex_lock()'
1147 dnl # if the mutex validator is disabled or otherwise unavailable.
1148 dnl #
1149 AC_DEFUN([SPL_AC_MUTEX_LOCK_NESTED], [
1150         AC_MSG_CHECKING([whether mutex_lock_nested() is available])
1151         SPL_LINUX_TRY_COMPILE([
1152                 #include <linux/mutex.h>
1153         ],[
1154                 struct mutex mutex;
1155                 mutex_init(&mutex);
1156                 mutex_lock_nested(&mutex, 0);
1157         ],[
1158                 AC_MSG_RESULT(yes)
1159                 AC_DEFINE(HAVE_MUTEX_LOCK_NESTED, 1,
1160                 [mutex_lock_nested() is available])
1161         ],[
1162                 AC_MSG_RESULT(no)
1163         ])
1164 ])
1165
1166 dnl #
1167 dnl # 2.6.27 API change,
1168 dnl # on_each_cpu() uses 3 args, no 'retry' argument
1169 dnl #
1170 AC_DEFUN([SPL_AC_3ARGS_ON_EACH_CPU], [
1171         AC_MSG_CHECKING([whether on_each_cpu() wants 3 args])
1172         SPL_LINUX_TRY_COMPILE([
1173                 #include <linux/smp.h>
1174         ],[
1175                 on_each_cpu(NULL, NULL, 0);
1176         ],[
1177                 AC_MSG_RESULT(yes)
1178                 AC_DEFINE(HAVE_3ARGS_ON_EACH_CPU, 1,
1179                           [on_each_cpu wants 3 args])
1180         ],[
1181                 AC_MSG_RESULT(no)
1182         ])
1183 ])
1184
1185 dnl #
1186 dnl # 2.6.18 API change,
1187 dnl # kallsyms_lookup_name no longer exported
1188 dnl #
1189 AC_DEFUN([SPL_AC_KALLSYMS_LOOKUP_NAME], [
1190         SPL_CHECK_SYMBOL_EXPORT(
1191                 [kallsyms_lookup_name],
1192                 [],
1193                 [AC_DEFINE(HAVE_KALLSYMS_LOOKUP_NAME, 1,
1194                 [kallsyms_lookup_name() is available])],
1195                 [])
1196 ])
1197
1198 dnl #
1199 dnl # Proposed API change,
1200 dnl # This symbol is not available in stock kernels.  You may build a
1201 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1202 dnl # these symbols for use.  If your already rolling a custom kernel for
1203 dnl # your environment this is recommended.
1204 dnl #
1205 AC_DEFUN([SPL_AC_GET_VMALLOC_INFO], [
1206         SPL_CHECK_SYMBOL_EXPORT(
1207                 [get_vmalloc_info],
1208                 [],
1209                 [AC_DEFINE(HAVE_GET_VMALLOC_INFO, 1,
1210                 [get_vmalloc_info() is available])],
1211                 [])
1212 ])
1213
1214 dnl #
1215 dnl # 2.6.17 API change
1216 dnl # The helper functions first_online_pgdat(), next_online_pgdat(), and
1217 dnl # next_zone() are introduced to simplify for_each_zone().  These symbols
1218 dnl # were exported in 2.6.17 for use by modules which was consistent with
1219 dnl # the previous implementation of for_each_zone().  From 2.6.18 - 2.6.19
1220 dnl # the symbols were exported as 'unused', and by 2.6.20 they exports
1221 dnl # were dropped entirely leaving modules no way to directly iterate over
1222 dnl # the zone list.  Because we need access to the zone helpers we check
1223 dnl # if the kernel contains the old or new implementation.  Then we check
1224 dnl # to see if the symbols we need for each version are available.  If they
1225 dnl # are not, dynamically aquire the addresses with kallsyms_lookup_name().
1226 dnl #
1227 AC_DEFUN([SPL_AC_PGDAT_HELPERS], [
1228         AC_MSG_CHECKING([whether symbol *_pgdat exist])
1229         grep -q -E 'first_online_pgdat' $LINUX/include/linux/mmzone.h 2>/dev/null
1230         rc=$?
1231         if test $rc -eq 0; then
1232                 AC_MSG_RESULT([yes])
1233                 AC_DEFINE(HAVE_PGDAT_HELPERS, 1, [pgdat helpers are available])
1234         else
1235                 AC_MSG_RESULT([no])
1236         fi
1237 ])
1238
1239 dnl #
1240 dnl # Proposed API change,
1241 dnl # This symbol is not available in stock kernels.  You may build a
1242 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1243 dnl # these symbols for use.  If your already rolling a custom kernel for
1244 dnl # your environment this is recommended.
1245 dnl #
1246 AC_DEFUN([SPL_AC_FIRST_ONLINE_PGDAT], [
1247         SPL_CHECK_SYMBOL_EXPORT(
1248                 [first_online_pgdat],
1249                 [],
1250                 [AC_DEFINE(HAVE_FIRST_ONLINE_PGDAT, 1,
1251                 [first_online_pgdat() is available])],
1252                 [])
1253 ])
1254
1255 dnl #
1256 dnl # Proposed API change,
1257 dnl # This symbol is not available in stock kernels.  You may build a
1258 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1259 dnl # these symbols for use.  If your already rolling a custom kernel for
1260 dnl # your environment this is recommended.
1261 dnl #
1262 AC_DEFUN([SPL_AC_NEXT_ONLINE_PGDAT], [
1263         SPL_CHECK_SYMBOL_EXPORT(
1264                 [next_online_pgdat],
1265                 [],
1266                 [AC_DEFINE(HAVE_NEXT_ONLINE_PGDAT, 1,
1267                 [next_online_pgdat() is available])],
1268                 [])
1269 ])
1270
1271 dnl #
1272 dnl # Proposed API change,
1273 dnl # This symbol is not available in stock kernels.  You may build a
1274 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1275 dnl # these symbols for use.  If your already rolling a custom kernel for
1276 dnl # your environment this is recommended.
1277 dnl #
1278 AC_DEFUN([SPL_AC_NEXT_ZONE], [
1279         SPL_CHECK_SYMBOL_EXPORT(
1280                 [next_zone],
1281                 [],
1282                 [AC_DEFINE(HAVE_NEXT_ZONE, 1,
1283                 [next_zone() is available])],
1284                 [])
1285 ])
1286
1287 dnl #
1288 dnl # 2.6.17 API change,
1289 dnl # See SPL_AC_PGDAT_HELPERS for details.
1290 dnl #
1291 AC_DEFUN([SPL_AC_PGDAT_LIST], [
1292         SPL_CHECK_SYMBOL_EXPORT(
1293                 [pgdat_list],
1294                 [],
1295                 [AC_DEFINE(HAVE_PGDAT_LIST, 1,
1296                 [pgdat_list is available])],
1297                 [])
1298 ])
1299
1300 dnl #
1301 dnl # 2.6.18 API change,
1302 dnl # First introduced global_page_state() support as an inline.
1303 dnl #
1304 AC_DEFUN([SPL_AC_GLOBAL_PAGE_STATE], [
1305         AC_MSG_CHECKING([whether global_page_state() is available])
1306         SPL_LINUX_TRY_COMPILE([
1307                 #include <linux/mm.h>
1308         ],[
1309                 unsigned long state __attribute__ ((unused));
1310                 state = global_page_state(0);
1311         ],[
1312                 AC_MSG_RESULT(yes)
1313                 AC_DEFINE(HAVE_GLOBAL_PAGE_STATE, 1,
1314                           [global_page_state() is available])
1315         ],[
1316                 AC_MSG_RESULT(no)
1317         ])
1318 ])
1319
1320 dnl #
1321 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1322 dnl # Public global zone stats now include a free page count.  However
1323 dnl # the enumerated names of the counters have changed since this API
1324 dnl # was introduced.  We need to deduce the corrent name to use.  This
1325 dnl # replaces the priviate get_zone_counts() interface.
1326 dnl #
1327 dnl # NR_FREE_PAGES was available from 2.6.21 to current kernels, which
1328 dnl # is 2.6.30 as of when this was written.
1329 dnl #
1330 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_FREE], [
1331         AC_MSG_CHECKING([whether page state NR_FREE_PAGES is available])
1332         SPL_LINUX_TRY_COMPILE([
1333                 #include <linux/mm.h>
1334         ],[
1335                 enum zone_stat_item zsi __attribute__ ((unused));
1336                 zsi = NR_FREE_PAGES;
1337         ],[
1338                 AC_MSG_RESULT(yes)
1339                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES, 1,
1340                           [Page state NR_FREE_PAGES is available])
1341         ],[
1342                 AC_MSG_RESULT(no)
1343         ])
1344 ])
1345
1346 dnl #
1347 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1348 dnl # Public global zone stats now include an inactive page count.  However
1349 dnl # the enumerated names of the counters have changed since this API
1350 dnl # was introduced.  We need to deduce the corrent name to use.  This
1351 dnl # replaces the priviate get_zone_counts() interface.
1352 dnl #
1353 dnl # NR_INACTIVE was available from 2.6.21 to 2.6.27 and included both
1354 dnl # anonymous and file inactive pages.  As of 2.6.28 it was split in
1355 dnl # to NR_INACTIVE_ANON and NR_INACTIVE_FILE.
1356 dnl #
1357 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_INACTIVE], [
1358         AC_MSG_CHECKING([whether page state NR_INACTIVE is available])
1359         SPL_LINUX_TRY_COMPILE([
1360                 #include <linux/mm.h>
1361         ],[
1362                 enum zone_stat_item zsi __attribute__ ((unused));
1363                 zsi = NR_INACTIVE;
1364         ],[
1365                 AC_MSG_RESULT(yes)
1366                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE, 1,
1367                           [Page state NR_INACTIVE is available])
1368         ],[
1369                 AC_MSG_RESULT(no)
1370         ])
1371
1372         AC_MSG_CHECKING([whether page state NR_INACTIVE_ANON is available])
1373         SPL_LINUX_TRY_COMPILE([
1374                 #include <linux/mm.h>
1375         ],[
1376                 enum zone_stat_item zsi __attribute__ ((unused));
1377                 zsi = NR_INACTIVE_ANON;
1378         ],[
1379                 AC_MSG_RESULT(yes)
1380                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON, 1,
1381                           [Page state NR_INACTIVE_ANON is available])
1382         ],[
1383                 AC_MSG_RESULT(no)
1384         ])
1385
1386         AC_MSG_CHECKING([whether page state NR_INACTIVE_FILE is available])
1387         SPL_LINUX_TRY_COMPILE([
1388                 #include <linux/mm.h>
1389         ],[
1390                 enum zone_stat_item zsi __attribute__ ((unused));
1391                 zsi = NR_INACTIVE_FILE;
1392         ],[
1393                 AC_MSG_RESULT(yes)
1394                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE, 1,
1395                           [Page state NR_INACTIVE_FILE is available])
1396         ],[
1397                 AC_MSG_RESULT(no)
1398         ])
1399 ])
1400
1401 dnl #
1402 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1403 dnl # Public global zone stats now include an active page count.  However
1404 dnl # the enumerated names of the counters have changed since this API
1405 dnl # was introduced.  We need to deduce the corrent name to use.  This
1406 dnl # replaces the priviate get_zone_counts() interface.
1407 dnl #
1408 dnl # NR_ACTIVE was available from 2.6.21 to 2.6.27 and included both
1409 dnl # anonymous and file active pages.  As of 2.6.28 it was split in
1410 dnl # to NR_ACTIVE_ANON and NR_ACTIVE_FILE.
1411 dnl #
1412 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_ACTIVE], [
1413         AC_MSG_CHECKING([whether page state NR_ACTIVE is available])
1414         SPL_LINUX_TRY_COMPILE([
1415                 #include <linux/mm.h>
1416         ],[
1417                 enum zone_stat_item zsi __attribute__ ((unused));
1418                 zsi = NR_ACTIVE;
1419         ],[
1420                 AC_MSG_RESULT(yes)
1421                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE, 1,
1422                           [Page state NR_ACTIVE is available])
1423         ],[
1424                 AC_MSG_RESULT(no)
1425         ])
1426
1427         AC_MSG_CHECKING([whether page state NR_ACTIVE_ANON is available])
1428         SPL_LINUX_TRY_COMPILE([
1429                 #include <linux/mm.h>
1430         ],[
1431                 enum zone_stat_item zsi __attribute__ ((unused));
1432                 zsi = NR_ACTIVE_ANON;
1433         ],[
1434                 AC_MSG_RESULT(yes)
1435                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON, 1,
1436                           [Page state NR_ACTIVE_ANON is available])
1437         ],[
1438                 AC_MSG_RESULT(no)
1439         ])
1440
1441         AC_MSG_CHECKING([whether page state NR_ACTIVE_FILE is available])
1442         SPL_LINUX_TRY_COMPILE([
1443                 #include <linux/mm.h>
1444         ],[
1445                 enum zone_stat_item zsi __attribute__ ((unused));
1446                 zsi = NR_ACTIVE_FILE;
1447         ],[
1448                 AC_MSG_RESULT(yes)
1449                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE, 1,
1450                           [Page state NR_ACTIVE_FILE is available])
1451         ],[
1452                 AC_MSG_RESULT(no)
1453         ])
1454 ])
1455
1456 dnl #
1457 dnl # Proposed API change for legacy kernels.
1458 dnl # This symbol is not available in older kernels.  For kernels post
1459 dnl # 2.6.21 the global_page_state() API is used to get free/inactive/active
1460 dnl # page state information.  This symbol is only used in legacy kernels
1461 dnl # any only as a last resort.
1462 dnl
1463 AC_DEFUN([SPL_AC_GET_ZONE_COUNTS], [
1464         AC_MSG_CHECKING([whether symbol get_zone_counts is needed])
1465         SPL_LINUX_TRY_COMPILE([
1466         ],[
1467                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES)
1468                 #error "global_page_state needs NR_FREE_PAGES"
1469                 #endif
1470
1471                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE) && \
1472                     !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON) && \
1473                     !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE)
1474                 #error "global_page_state needs NR_ACTIVE*"
1475                 #endif
1476
1477                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE) && \
1478                     !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON) && \
1479                     !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE)
1480                 #error "global_page_state needs NR_INACTIVE*"
1481                 #endif
1482         ],[
1483                 AC_MSG_RESULT(no)
1484         ],[
1485                 AC_MSG_RESULT(yes)
1486                 AC_DEFINE(NEED_GET_ZONE_COUNTS, 1,
1487                           [get_zone_counts() is needed])
1488
1489                 SPL_CHECK_SYMBOL_EXPORT(
1490                         [get_zone_counts],
1491                         [],
1492                         [AC_DEFINE(HAVE_GET_ZONE_COUNTS, 1,
1493                         [get_zone_counts() is available])],
1494                         [])
1495         ])
1496 ])
1497
1498 dnl #
1499 dnl # 2.6.27 API change,
1500 dnl # The user_path_dir() replaces __user_walk()
1501 dnl #
1502 AC_DEFUN([SPL_AC_USER_PATH_DIR], [
1503         SPL_CHECK_SYMBOL_EXPORT(
1504                 [user_path_at],
1505                 [],
1506                 [AC_DEFINE(HAVE_USER_PATH_DIR, 1,
1507                 [user_path_dir() is available])],
1508                 [])
1509 ])
1510
1511 dnl #
1512 dnl # Symbol available in RHEL kernels not in stock kernels.
1513 dnl #
1514 AC_DEFUN([SPL_AC_SET_FS_PWD], [
1515         SPL_CHECK_SYMBOL_EXPORT(
1516                 [set_fs_pwd],
1517                 [],
1518                 [AC_DEFINE(HAVE_SET_FS_PWD, 1,
1519                 [set_fs_pwd() is available])],
1520                 [])
1521 ])
1522
1523 dnl #
1524 dnl # 2.6.25 API change,
1525 dnl # Simplied API by replacing mnt+dentry args with a single path arg.
1526 dnl #
1527 AC_DEFUN([SPL_AC_2ARGS_SET_FS_PWD],
1528         [AC_MSG_CHECKING([whether set_fs_pwd() wants 2 args])
1529         SPL_LINUX_TRY_COMPILE([
1530                 #include <linux/sched.h>
1531                 #include <linux/fs_struct.h>
1532         ],[
1533                 set_fs_pwd(NULL, NULL);
1534         ],[
1535                 AC_MSG_RESULT(yes)
1536                 AC_DEFINE(HAVE_2ARGS_SET_FS_PWD, 1,
1537                           [set_fs_pwd() wants 2 args])
1538         ],[
1539                 AC_MSG_RESULT(no)
1540         ])
1541 ])
1542
1543 dnl #
1544 dnl # SLES API change, never adopted in mainline,
1545 dnl # Third 'struct vfsmount *' argument removed.
1546 dnl #
1547 AC_DEFUN([SPL_AC_2ARGS_VFS_UNLINK],
1548         [AC_MSG_CHECKING([whether vfs_unlink() wants 2 args])
1549         SPL_LINUX_TRY_COMPILE([
1550                 #include <linux/fs.h>
1551         ],[
1552                 vfs_unlink(NULL, NULL);
1553         ],[
1554                 AC_MSG_RESULT(yes)
1555                 AC_DEFINE(HAVE_2ARGS_VFS_UNLINK, 1,
1556                           [vfs_unlink() wants 2 args])
1557         ],[
1558                 AC_MSG_RESULT(no)
1559         ])
1560 ])
1561
1562 dnl #
1563 dnl # SLES API change, never adopted in mainline,
1564 dnl # Third and sixth 'struct vfsmount *' argument removed.
1565 dnl #
1566 AC_DEFUN([SPL_AC_4ARGS_VFS_RENAME],
1567         [AC_MSG_CHECKING([whether vfs_rename() wants 4 args])
1568         SPL_LINUX_TRY_COMPILE([
1569                 #include <linux/fs.h>
1570         ],[
1571                 vfs_rename(NULL, NULL, NULL, NULL);
1572         ],[
1573                 AC_MSG_RESULT(yes)
1574                 AC_DEFINE(HAVE_4ARGS_VFS_RENAME, 1,
1575                           [vfs_rename() wants 4 args])
1576         ],[
1577                 AC_MSG_RESULT(no)
1578         ])
1579 ])
1580
1581 dnl #
1582 dnl # 2.6.36 API change,
1583 dnl # The 'struct fs_struct->lock' was changed from a rwlock_t to
1584 dnl # a spinlock_t to improve the fastpath performance.
1585 dnl #
1586 AC_DEFUN([SPL_AC_FS_STRUCT_SPINLOCK], [
1587         AC_MSG_CHECKING([whether struct fs_struct uses spinlock_t])
1588         SPL_LINUX_TRY_COMPILE([
1589                 #include <linux/sched.h>
1590                 #include <linux/fs_struct.h>
1591         ],[
1592                 struct fs_struct fs;
1593                 spin_lock_init(&fs.lock);
1594         ],[
1595                 AC_MSG_RESULT(yes)
1596                 AC_DEFINE(HAVE_FS_STRUCT_SPINLOCK, 1,
1597                           [struct fs_struct uses spinlock_t])
1598         ],[
1599                 AC_MSG_RESULT(no)
1600         ])
1601 ])
1602
1603 dnl #
1604 dnl # 2.6.29 API change,
1605 dnl # check whether 'struct cred' exists
1606 dnl #
1607 AC_DEFUN([SPL_AC_CRED_STRUCT], [
1608         AC_MSG_CHECKING([whether struct cred exists])
1609         SPL_LINUX_TRY_COMPILE([
1610                 #include <linux/cred.h>
1611         ],[
1612                 struct cred *cr __attribute__ ((unused));
1613                 cr  = NULL;
1614         ],[
1615                 AC_MSG_RESULT(yes)
1616                 AC_DEFINE(HAVE_CRED_STRUCT, 1, [struct cred exists])
1617         ],[
1618                 AC_MSG_RESULT(no)
1619         ])
1620 ])
1621
1622 dnl #
1623 dnl # Custom SPL patch may export this symbol.
1624 dnl #
1625 AC_DEFUN([SPL_AC_GROUPS_SEARCH], [
1626         SPL_CHECK_SYMBOL_EXPORT(
1627                 [groups_search],
1628                 [],
1629                 [AC_DEFINE(HAVE_GROUPS_SEARCH, 1,
1630                 [groups_search() is available])],
1631                 [])
1632 ])
1633
1634 dnl #
1635 dnl # 2.6.x API change,
1636 dnl # __put_task_struct() was exported in RHEL5 but unavailable elsewhere.
1637 dnl #
1638 AC_DEFUN([SPL_AC_PUT_TASK_STRUCT], [
1639         SPL_CHECK_SYMBOL_EXPORT(
1640                 [__put_task_struct],
1641                 [],
1642                 [AC_DEFINE(HAVE_PUT_TASK_STRUCT, 1,
1643                 [__put_task_struct() is available])],
1644                 [])
1645 ])
1646
1647 dnl #
1648 dnl # 2.6.32 API change,
1649 dnl # Unused 'struct file *' removed from prototype.
1650 dnl #
1651 AC_DEFUN([SPL_AC_5ARGS_PROC_HANDLER], [
1652         AC_MSG_CHECKING([whether proc_handler() wants 5 args])
1653         SPL_LINUX_TRY_COMPILE([
1654                 #include <linux/sysctl.h>
1655         ],[
1656                 proc_dostring(NULL, 0, NULL, NULL, NULL);
1657         ],[
1658                 AC_MSG_RESULT(yes)
1659                 AC_DEFINE(HAVE_5ARGS_PROC_HANDLER, 1,
1660                           [proc_handler() wants 5 args])
1661         ],[
1662                 AC_MSG_RESULT(no)
1663         ])
1664 ])
1665
1666 dnl #
1667 dnl # 2.6.x API change,
1668 dnl # kvasprintf() function added.
1669 dnl #
1670 AC_DEFUN([SPL_AC_KVASPRINTF], [
1671         SPL_CHECK_SYMBOL_EXPORT(
1672                 [kvasprintf],
1673                 [],
1674                 [AC_DEFINE(HAVE_KVASPRINTF, 1,
1675                 [kvasprintf() is available])],
1676                 [])
1677 ])
1678
1679 dnl #
1680 dnl # 2.6.35 API change,
1681 dnl # Unused 'struct dentry *' removed from prototype.
1682 dnl #
1683 AC_DEFUN([SPL_AC_3ARGS_FILE_FSYNC], [
1684         AC_MSG_CHECKING([whether file_fsync() wants 3 args])
1685         SPL_LINUX_TRY_COMPILE([
1686                 #include <linux/buffer_head.h>
1687         ],[
1688                 file_fsync(NULL, NULL, 0);
1689         ],[
1690                 AC_MSG_RESULT(yes)
1691                 AC_DEFINE(HAVE_3ARGS_FILE_FSYNC, 1,
1692                           [file_fsync() wants 3 args])
1693         ],[
1694                 AC_MSG_RESULT(no)
1695         ])
1696 ])
1697
1698 dnl #
1699 dnl # 2.6.33 API change. Also backported in RHEL5 as of 2.6.18-190.el5.
1700 dnl # Earlier versions of rwsem_is_locked() were inline and had a race
1701 dnl # condition.  The fixed version is exported as a symbol.  The race
1702 dnl # condition is fixed by acquiring sem->wait_lock, so we must not
1703 dnl # call that version while holding sem->wait_lock.
1704 dnl #
1705 AC_DEFUN([SPL_AC_EXPORTED_RWSEM_IS_LOCKED], [
1706         SPL_CHECK_SYMBOL_EXPORT(
1707                 [rwsem_is_locked],
1708                 [lib/rwsem-spinlock.c],
1709                 [AC_DEFINE(RWSEM_IS_LOCKED_TAKES_WAIT_LOCK, 1,
1710                 [rwsem_is_locked() acquires sem->wait_lock])],
1711                 [])
1712 ])
1713
1714 dnl #
1715 dnl # 2.6.37 API compat,
1716 dnl # The function invalidate_inodes() is no longer exported by the kernel.
1717 dnl # The prototype however is still available which means it is safe
1718 dnl # to acquire the symbol's address using spl_kallsyms_lookup_name().
1719 dnl #
1720 AC_DEFUN([SPL_AC_KERNEL_INVALIDATE_INODES], [
1721         SPL_CHECK_SYMBOL_EXPORT(
1722                 [invalidate_inodes],
1723                 [],
1724                 [AC_DEFINE(HAVE_INVALIDATE_INODES, 1,
1725                 [invalidate_inodes() is available])],
1726                 [])
1727 ])
1728
1729 dnl #
1730 dnl # 2.6.39 API compat,
1731 dnl # The function invalidate_inodes() now take 2 arguments.  The second
1732 dnl # 'kill_dirty' argument describes how invalidate_inodes() should
1733 dnl # handle dirty inodes.  Only when set will dirty inodes be discarded,
1734 dnl # otherwise they will be handled as busy.
1735 dnl #
1736 dnl # Unfortunately, we don't have access to the invalidate_inodes()
1737 dnl # prototype so it's not easy to check how many arguments it takes.
1738 dnl # However, this change was done for the benefit of invalidate_device()
1739 dnl # which also added an argument.  The invalidate_device() symbol does
1740 dnl # exist in the development headers so if it takes two arguments we
1741 dnl # can fairly safely infer that invalidate_inodes() takes two arguments
1742 dnl # as well.  See commit 93b270f76e7ef3b81001576860c2701931cdc78b.
1743 dnl #
1744 AC_DEFUN([SPL_AC_KERNEL_2ARGS_INVALIDATE_INODES],
1745         [AC_MSG_CHECKING([whether invalidate_inodes() wants 2 args])
1746         SPL_LINUX_TRY_COMPILE([
1747                 #include <linux/fs.h>
1748         ],[
1749                 return __invalidate_device(NULL, 0);
1750         ],[
1751                 AC_MSG_RESULT(yes)
1752                 AC_DEFINE(HAVE_2ARGS_INVALIDATE_INODES, 1,
1753                           [invalidate_inodes() wants 2 args])
1754         ],[
1755                 AC_MSG_RESULT(no)
1756         ])
1757 ])
1758
1759 dnl #
1760 dnl # 2.6.xx API compat,
1761 dnl # There currently exists no exposed API to partially shrink the dcache.
1762 dnl # The expected mechanism to shrink the cache is a registered shrinker
1763 dnl # which is called during memory pressure.
1764 dnl #
1765 AC_DEFUN([SPL_AC_SHRINK_DCACHE_MEMORY], [
1766         SPL_CHECK_SYMBOL_EXPORT(
1767                 [shrink_dcache_memory],
1768                 [fs/dcache.c],
1769                 [AC_DEFINE(HAVE_SHRINK_DCACHE_MEMORY, 1,
1770                 [shrink_dcache_memory() is available])],
1771                 [])
1772 ])
1773
1774 dnl #
1775 dnl # 2.6.xx API compat,
1776 dnl # There currently exists no exposed API to partially shrink the icache.
1777 dnl # The expected mechanism to shrink the cache is a registered shrinker
1778 dnl # which is called during memory pressure.
1779 dnl #
1780 AC_DEFUN([SPL_AC_SHRINK_ICACHE_MEMORY], [
1781         SPL_CHECK_SYMBOL_EXPORT(
1782                 [shrink_icache_memory],
1783                 [fs/inode.c],
1784                 [AC_DEFINE(HAVE_SHRINK_ICACHE_MEMORY, 1,
1785                 [shrink_icache_memory() is available])],
1786                 [])
1787 ])