config/spl-build.m4

   1 ###############################################################################
   2 # Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
   3 # Copyright (C) 2007 The Regents of the University of California.
   4 # Written by Brian Behlendorf <behlendorf1@llnl.gov>.
   5 ###############################################################################
   6 # SPL_AC_CONFIG_KERNEL: Default SPL kernel configuration.
   7 ###############################################################################
   8
   9 AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
  10         SPL_AC_KERNEL
  11
  12         if test "${LINUX_OBJ}" != "${LINUX}"; then
  13                 KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
  14         fi
  15         AC_SUBST(KERNELMAKE_PARAMS)
  16
  17         KERNELCPPFLAGS="$KERNELCPPFLAGS -Wstrict-prototypes"
  18         AC_SUBST(KERNELCPPFLAGS)
  19
  20         SPL_AC_TEST_MODULE
  21         SPL_AC_ATOMIC_SPINLOCK
  22         SPL_AC_SHRINKER_CALLBACK
  23         SPL_AC_CTL_NAME
  24         SPL_AC_CONFIG_TRIM_UNUSED_KSYMS
  25         SPL_AC_PDE_DATA
  26         SPL_AC_SET_FS_PWD_WITH_CONST
  27         SPL_AC_2ARGS_VFS_FSYNC
  28         SPL_AC_INODE_TRUNCATE_RANGE
  29         SPL_AC_FS_STRUCT_SPINLOCK
  30         SPL_AC_KUIDGID_T
  31         SPL_AC_KERNEL_FALLOCATE
  32         SPL_AC_CONFIG_ZLIB_INFLATE
  33         SPL_AC_CONFIG_ZLIB_DEFLATE
  34         SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
  35         SPL_AC_SHRINK_CONTROL_STRUCT
  36         SPL_AC_RWSEM_SPINLOCK_IS_RAW
  37         SPL_AC_RWSEM_ACTIVITY
  38         SPL_AC_RWSEM_ATOMIC_LONG_COUNT
  39         SPL_AC_SCHED_RT_HEADER
  40         SPL_AC_SCHED_SIGNAL_HEADER
  41         SPL_AC_4ARGS_VFS_GETATTR
  42         SPL_AC_3ARGS_VFS_GETATTR
  43         SPL_AC_2ARGS_VFS_GETATTR
  44         SPL_AC_USLEEP_RANGE
  45         SPL_AC_KMEM_CACHE_ALLOCFLAGS
  46         SPL_AC_WAIT_ON_BIT
  47         SPL_AC_INODE_LOCK
  48         SPL_AC_GROUP_INFO_GID
  49         SPL_AC_KMEM_CACHE_CREATE_USERCOPY
  50         SPL_AC_WAIT_QUEUE_ENTRY_T
  51         SPL_AC_WAIT_QUEUE_HEAD_ENTRY
  52         SPL_AC_IO_SCHEDULE_TIMEOUT
  53         SPL_AC_KERNEL_WRITE
  54         SPL_AC_KERNEL_READ
  55         SPL_AC_KERNEL_TIMER_FUNCTION_TIMER_LIST
  56 ])
  57
  58 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
  59         modpost=$LINUX/scripts/Makefile.modpost
  60         AC_MSG_CHECKING([kernel file name for module symbols])
  61         if test "x$enable_linux_builtin" != xyes -a -f "$modpost"; then
  62                 if grep -q Modules.symvers $modpost; then
  63                         LINUX_SYMBOLS=Modules.symvers
  64                 else
  65                         LINUX_SYMBOLS=Module.symvers
  66                 fi
  67
  68                 if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
  69                         AC_MSG_ERROR([
  70         *** Please make sure the kernel devel package for your distribution
  71         *** is installed.  If you are building with a custom kernel, make sure the
  72         *** kernel is configured, built, and the '--with-linux=PATH' configure
  73         *** option refers to the location of the kernel source.])
  74                 fi
  75         else
  76                 LINUX_SYMBOLS=NONE
  77         fi
  78         AC_MSG_RESULT($LINUX_SYMBOLS)
  79         AC_SUBST(LINUX_SYMBOLS)
  80 ])
  81
  82 AC_DEFUN([SPL_AC_KERNEL], [
  83         AC_ARG_WITH([linux],
  84                 AS_HELP_STRING([--with-linux=PATH],
  85                 [Path to kernel source]),
  86                 [kernelsrc="$withval"])
  87
  88         AC_ARG_WITH([linux-obj],
  89                 AS_HELP_STRING([--with-linux-obj=PATH],
  90                 [Path to kernel build objects]),
  91                 [kernelbuild="$withval"])
  92
  93         AC_MSG_CHECKING([kernel source directory])
  94         if test -z "$kernelsrc"; then
  95                 if test -e "/lib/modules/$(uname -r)/source"; then
  96                         headersdir="/lib/modules/$(uname -r)/source"
  97                         sourcelink=$(readlink -f "$headersdir")
  98                 elif test -e "/lib/modules/$(uname -r)/build"; then
  99                         headersdir="/lib/modules/$(uname -r)/build"
 100                         sourcelink=$(readlink -f "$headersdir")
 101                 else
 102                         sourcelink=$(ls -1d /usr/src/kernels/* \
 103                                      /usr/src/linux-* \
 104                                      2>/dev/null | grep -v obj | tail -1)
 105                 fi
 106
 107                 if test -n "$sourcelink" && test -e ${sourcelink}; then
 108                         kernelsrc=`readlink -f ${sourcelink}`
 109                 else
 110                         kernelsrc="[Not found]"
 111                 fi
 112         else
 113                 if test "$kernelsrc" = "NONE"; then
 114                         kernsrcver=NONE
 115                 fi
 116                 withlinux=yes
 117         fi
 118
 119         AC_MSG_RESULT([$kernelsrc])
 120         if test ! -d "$kernelsrc"; then
 121                 AC_MSG_ERROR([
 122         *** Please make sure the kernel devel package for your distribution
 123         *** is installed and then try again.  If that fails, you can specify the
 124         *** location of the kernel source with the '--with-linux=PATH' option.])
 125         fi
 126
 127         AC_MSG_CHECKING([kernel build directory])
 128         if test -z "$kernelbuild"; then
 129                 if test x$withlinux != xyes -a -e "/lib/modules/$(uname -r)/build"; then
 130                         kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
 131                 elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
 132                         kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
 133                 elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
 134                         kernelbuild=${kernelsrc}-obj/${target_cpu}/default
 135                 elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
 136                         kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
 137                 else
 138                         kernelbuild=${kernelsrc}
 139                 fi
 140         fi
 141         AC_MSG_RESULT([$kernelbuild])
 142
 143         AC_MSG_CHECKING([kernel source version])
 144         utsrelease1=$kernelbuild/include/linux/version.h
 145         utsrelease2=$kernelbuild/include/linux/utsrelease.h
 146         utsrelease3=$kernelbuild/include/generated/utsrelease.h
 147         if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
 148                 utsrelease=linux/version.h
 149         elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
 150                 utsrelease=linux/utsrelease.h
 151         elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
 152                 utsrelease=generated/utsrelease.h
 153         fi
 154
 155         if test "$utsrelease"; then
 156                 kernsrcver=`(echo "#include <$utsrelease>";
 157                              echo "kernsrcver=UTS_RELEASE") |
 158                              cpp -I $kernelbuild/include |
 159                              grep "^kernsrcver=" | cut -d \" -f 2`
 160
 161                 if test -z "$kernsrcver"; then
 162                         AC_MSG_RESULT([Not found])
 163                         AC_MSG_ERROR([*** Cannot determine kernel version.])
 164                 fi
 165         else
 166                 AC_MSG_RESULT([Not found])
 167                 if test "x$enable_linux_builtin" != xyes; then
 168                         AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
 169                 else
 170                         AC_MSG_ERROR([
 171         *** Cannot find UTS_RELEASE definition.
 172         *** Please run 'make prepare' inside the kernel source tree.])
 173                 fi
 174         fi
 175
 176         AC_MSG_RESULT([$kernsrcver])
 177
 178         LINUX=${kernelsrc}
 179         LINUX_OBJ=${kernelbuild}
 180         LINUX_VERSION=${kernsrcver}
 181
 182         AC_SUBST(LINUX)
 183         AC_SUBST(LINUX_OBJ)
 184         AC_SUBST(LINUX_VERSION)
 185
 186         SPL_AC_MODULE_SYMVERS
 187 ])
 188
 189 dnl #
 190 dnl # Default SPL user configuration
 191 dnl #
 192 AC_DEFUN([SPL_AC_CONFIG_USER], [])
 193
 194 dnl #
 195 dnl # Check for rpm+rpmbuild to build RPM packages.  If these tools
 196 dnl # are missing, it is non-fatal, but you will not be able to build
 197 dnl # RPM packages and will be warned if you try too.
 198 dnl #
 199 dnl # By default, the generic spec file will be used because it requires
 200 dnl # minimal dependencies.  Distribution specific spec files can be
 201 dnl # placed under the 'rpm/<distribution>' directory and enabled using
 202 dnl # the --with-spec=<distribution> configure option.
 203 dnl #
 204 AC_DEFUN([SPL_AC_RPM], [
 205         RPM=rpm
 206         RPMBUILD=rpmbuild
 207
 208         AC_MSG_CHECKING([whether $RPM is available])
 209         AS_IF([tmp=$($RPM --version 2>/dev/null)], [
 210                 RPM_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
 211                 HAVE_RPM=yes
 212                 AC_MSG_RESULT([$HAVE_RPM ($RPM_VERSION)])
 213         ],[
 214                 HAVE_RPM=no
 215                 AC_MSG_RESULT([$HAVE_RPM])
 216         ])
 217
 218         AC_MSG_CHECKING([whether $RPMBUILD is available])
 219         AS_IF([tmp=$($RPMBUILD --version 2>/dev/null)], [
 220                 RPMBUILD_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
 221                 HAVE_RPMBUILD=yes
 222                 AC_MSG_RESULT([$HAVE_RPMBUILD ($RPMBUILD_VERSION)])
 223         ],[
 224                 HAVE_RPMBUILD=no
 225                 AC_MSG_RESULT([$HAVE_RPMBUILD])
 226         ])
 227
 228         RPM_DEFINE_COMMON='--define "$(DEBUG_SPL) 1"'
 229         RPM_DEFINE_COMMON+=' --define "$(DEBUG_KMEM) 1"'
 230         RPM_DEFINE_COMMON+=' --define "$(DEBUG_KMEM_TRACKING) 1"'
 231         RPM_DEFINE_UTIL=
 232         RPM_DEFINE_KMOD='--define "kernels $(LINUX_VERSION)"'
 233         RPM_DEFINE_KMOD+=' --define "_wrong_version_format_terminate_build 0"'
 234         RPM_DEFINE_DKMS=
 235
 236         SRPM_DEFINE_COMMON='--define "build_src_rpm 1"'
 237         SRPM_DEFINE_UTIL=
 238         SRPM_DEFINE_KMOD=
 239         SRPM_DEFINE_DKMS=
 240
 241         RPM_SPEC_DIR="rpm/generic"
 242         AC_ARG_WITH([spec],
 243                 AS_HELP_STRING([--with-spec=SPEC],
 244                 [Spec files 'generic|redhat']),
 245                 [RPM_SPEC_DIR="rpm/$withval"])
 246
 247         AC_MSG_CHECKING([whether spec files are available])
 248         AC_MSG_RESULT([yes ($RPM_SPEC_DIR/*.spec.in)])
 249
 250         AC_SUBST(HAVE_RPM)
 251         AC_SUBST(RPM)
 252         AC_SUBST(RPM_VERSION)
 253
 254         AC_SUBST(HAVE_RPMBUILD)
 255         AC_SUBST(RPMBUILD)
 256         AC_SUBST(RPMBUILD_VERSION)
 257
 258         AC_SUBST(RPM_SPEC_DIR)
 259         AC_SUBST(RPM_DEFINE_UTIL)
 260         AC_SUBST(RPM_DEFINE_KMOD)
 261         AC_SUBST(RPM_DEFINE_DKMS)
 262         AC_SUBST(RPM_DEFINE_COMMON)
 263         AC_SUBST(SRPM_DEFINE_UTIL)
 264         AC_SUBST(SRPM_DEFINE_KMOD)
 265         AC_SUBST(SRPM_DEFINE_DKMS)
 266         AC_SUBST(SRPM_DEFINE_COMMON)
 267 ])
 268
 269 dnl #
 270 dnl # Check for dpkg+dpkg-buildpackage to build DEB packages.  If these
 271 dnl # tools are missing it is non-fatal but you will not be able to build
 272 dnl # DEB packages and will be warned if you try too.
 273 dnl #
 274 AC_DEFUN([SPL_AC_DPKG], [
 275         DPKG=dpkg
 276         DPKGBUILD=dpkg-buildpackage
 277
 278         AC_MSG_CHECKING([whether $DPKG is available])
 279         AS_IF([tmp=$($DPKG --version 2>/dev/null)], [
 280                 DPKG_VERSION=$(echo $tmp | $AWK '/Debian/ { print $[7] }')
 281                 HAVE_DPKG=yes
 282                 AC_MSG_RESULT([$HAVE_DPKG ($DPKG_VERSION)])
 283         ],[
 284                 HAVE_DPKG=no
 285                 AC_MSG_RESULT([$HAVE_DPKG])
 286         ])
 287
 288         AC_MSG_CHECKING([whether $DPKGBUILD is available])
 289         AS_IF([tmp=$($DPKGBUILD --version 2>/dev/null)], [
 290                 DPKGBUILD_VERSION=$(echo $tmp | \
 291                     $AWK '/Debian/ { print $[4] }' | cut -f-4 -d'.')
 292                 HAVE_DPKGBUILD=yes
 293                 AC_MSG_RESULT([$HAVE_DPKGBUILD ($DPKGBUILD_VERSION)])
 294         ],[
 295                 HAVE_DPKGBUILD=no
 296                 AC_MSG_RESULT([$HAVE_DPKGBUILD])
 297         ])
 298
 299         AC_SUBST(HAVE_DPKG)
 300         AC_SUBST(DPKG)
 301         AC_SUBST(DPKG_VERSION)
 302
 303         AC_SUBST(HAVE_DPKGBUILD)
 304         AC_SUBST(DPKGBUILD)
 305         AC_SUBST(DPKGBUILD_VERSION)
 306 ])
 307
 308 dnl #
 309 dnl # Until native packaging for various different packing systems
 310 dnl # can be added the least we can do is attempt to use alien to
 311 dnl # convert the RPM packages to the needed package type.  This is
 312 dnl # a hack but so far it has worked reasonable well.
 313 dnl #
 314 AC_DEFUN([SPL_AC_ALIEN], [
 315         ALIEN=alien
 316
 317         AC_MSG_CHECKING([whether $ALIEN is available])
 318         AS_IF([tmp=$($ALIEN --version 2>/dev/null)], [
 319                 ALIEN_VERSION=$(echo $tmp | $AWK '{ print $[3] }')
 320                 HAVE_ALIEN=yes
 321                 AC_MSG_RESULT([$HAVE_ALIEN ($ALIEN_VERSION)])
 322         ],[
 323                 HAVE_ALIEN=no
 324                 AC_MSG_RESULT([$HAVE_ALIEN])
 325         ])
 326
 327         AC_SUBST(HAVE_ALIEN)
 328         AC_SUBST(ALIEN)
 329         AC_SUBST(ALIEN_VERSION)
 330 ])
 331
 332 dnl #
 333 dnl # Using the VENDOR tag from config.guess set the default
 334 dnl # package type for 'make pkg': (rpm | deb | tgz)
 335 dnl #
 336 AC_DEFUN([SPL_AC_DEFAULT_PACKAGE], [
 337         AC_MSG_CHECKING([linux distribution])
 338         if test -f /etc/toss-release ; then
 339                 VENDOR=toss ;
 340         elif test -f /etc/fedora-release ; then
 341                 VENDOR=fedora ;
 342         elif test -f /etc/redhat-release ; then
 343                 VENDOR=redhat ;
 344         elif test -f /etc/gentoo-release ; then
 345                 VENDOR=gentoo ;
 346         elif test -f /etc/arch-release ; then
 347                 VENDOR=arch ;
 348         elif test -f /etc/SuSE-release ; then
 349                 VENDOR=sles ;
 350         elif test -f /etc/slackware-version ; then
 351                 VENDOR=slackware ;
 352         elif test -f /etc/lunar.release ; then
 353                 VENDOR=lunar ;
 354         elif test -f /etc/lsb-release ; then
 355                 VENDOR=ubuntu ;
 356         elif test -f /etc/debian_version ; then
 357                 VENDOR=debian ;
 358         else
 359                 VENDOR= ;
 360         fi
 361         AC_MSG_RESULT([$VENDOR])
 362         AC_SUBST(VENDOR)
 363
 364         AC_MSG_CHECKING([default package type])
 365         case "$VENDOR" in
 366                 toss)       DEFAULT_PACKAGE=rpm  ;;
 367                 redhat)     DEFAULT_PACKAGE=rpm  ;;
 368                 fedora)     DEFAULT_PACKAGE=rpm  ;;
 369                 gentoo)     DEFAULT_PACKAGE=tgz  ;;
 370                 arch)       DEFAULT_PACKAGE=tgz  ;;
 371                 sles)       DEFAULT_PACKAGE=rpm  ;;
 372                 slackware)  DEFAULT_PACKAGE=tgz  ;;
 373                 lunar)      DEFAULT_PACKAGE=tgz  ;;
 374                 ubuntu)     DEFAULT_PACKAGE=deb  ;;
 375                 debian)     DEFAULT_PACKAGE=deb  ;;
 376                 *)          DEFAULT_PACKAGE=rpm  ;;
 377         esac
 378
 379         AC_MSG_RESULT([$DEFAULT_PACKAGE])
 380         AC_SUBST(DEFAULT_PACKAGE)
 381 ])
 382
 383 dnl #
 384 dnl # Default SPL user configuration
 385 dnl #
 386 AC_DEFUN([SPL_AC_PACKAGE], [
 387         SPL_AC_DEFAULT_PACKAGE
 388         SPL_AC_RPM
 389         SPL_AC_DPKG
 390         SPL_AC_ALIEN
 391 ])
 392
 393 AC_DEFUN([SPL_AC_LICENSE], [
 394         AC_MSG_CHECKING([spl author])
 395         AC_MSG_RESULT([$SPL_META_AUTHOR])
 396
 397         AC_MSG_CHECKING([spl license])
 398         AC_MSG_RESULT([$SPL_META_LICENSE])
 399 ])
 400
 401 AC_DEFUN([SPL_AC_CONFIG], [
 402         SPL_CONFIG=all
 403         AC_ARG_WITH([config],
 404                 AS_HELP_STRING([--with-config=CONFIG],
 405                 [Config file 'kernel|user|all|srpm']),
 406                 [SPL_CONFIG="$withval"])
 407         AC_ARG_ENABLE([linux-builtin],
 408                 [AC_HELP_STRING([--enable-linux-builtin],
 409                 [Configure for builtin in-tree kernel modules @<:@default=no@:>@])],
 410                 [],
 411                 [enable_linux_builtin=no])
 412
 413         AC_MSG_CHECKING([spl config])
 414         AC_MSG_RESULT([$SPL_CONFIG]);
 415         AC_SUBST(SPL_CONFIG)
 416
 417         case "$SPL_CONFIG" in
 418                 kernel) SPL_AC_CONFIG_KERNEL ;;
 419                 user)   SPL_AC_CONFIG_USER   ;;
 420                 all)    SPL_AC_CONFIG_KERNEL
 421                         SPL_AC_CONFIG_USER   ;;
 422                 srpm)                        ;;
 423                 *)
 424                 AC_MSG_RESULT([Error!])
 425                 AC_MSG_ERROR([Bad value "$SPL_CONFIG" for --with-config,
 426                              user kernel|user|all|srpm]) ;;
 427         esac
 428
 429         AM_CONDITIONAL([CONFIG_USER],
 430                        [test "$SPL_CONFIG" = user -o "$SPL_CONFIG" = all])
 431         AM_CONDITIONAL([CONFIG_KERNEL],
 432                        [test "$SPL_CONFIG" = kernel -o "$SPL_CONFIG" = all] &&
 433                        [test "x$enable_linux_builtin" != xyes ])
 434 ])
 435
 436 dnl #
 437 dnl # Enable if the SPL should be compiled with internal debugging enabled.
 438 dnl # By default this support is disabled.
 439 dnl #
 440 AC_DEFUN([SPL_AC_DEBUG], [
 441         AC_MSG_CHECKING([whether debugging is enabled])
 442         AC_ARG_ENABLE([debug],
 443                 [AS_HELP_STRING([--enable-debug],
 444                 [Enable generic debug support @<:@default=no@:>@])],
 445                 [],
 446                 [enable_debug=no])
 447
 448         AS_IF([test "x$enable_debug" = xyes],
 449         [
 450                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG -Werror"
 451                 DEBUG_CFLAGS="-DDEBUG -Werror"
 452                 DEBUG_SPL="_with_debug"
 453         ], [
 454                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DNDEBUG"
 455                 DEBUG_CFLAGS="-DNDEBUG"
 456                 DEBUG_SPL="_without_debug"
 457         ])
 458
 459         AC_SUBST(DEBUG_CFLAGS)
 460         AC_SUBST(DEBUG_SPL)
 461         AC_MSG_RESULT([$enable_debug])
 462 ])
 463
 464 dnl #
 465 dnl # Enabled by default it provides a minimal level of memory tracking.
 466 dnl # A total count of bytes allocated is kept for each alloc and free.
 467 dnl # Then at module unload time a report to the console will be printed
 468 dnl # if memory was leaked.
 469 dnl #
 470 AC_DEFUN([SPL_AC_DEBUG_KMEM], [
 471         AC_ARG_ENABLE([debug-kmem],
 472                 [AS_HELP_STRING([--enable-debug-kmem],
 473                 [Enable basic kmem accounting @<:@default=no@:>@])],
 474                 [],
 475                 [enable_debug_kmem=no])
 476
 477         AS_IF([test "x$enable_debug_kmem" = xyes],
 478         [
 479                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM"
 480                 DEBUG_KMEM="_with_debug_kmem"
 481                 AC_DEFINE([DEBUG_KMEM], [1],
 482                 [Define to 1 to enable basic kmem accounting])
 483         ], [
 484                 DEBUG_KMEM="_without_debug_kmem"
 485         ])
 486
 487         AC_SUBST(DEBUG_KMEM)
 488         AC_MSG_CHECKING([whether basic kmem accounting is enabled])
 489         AC_MSG_RESULT([$enable_debug_kmem])
 490 ])
 491
 492 dnl #
 493 dnl # Disabled by default it provides detailed memory tracking.  This
 494 dnl # feature also requires --enable-debug-kmem to be set.  When enabled
 495 dnl # not only will total bytes be tracked but also the location of every
 496 dnl # alloc and free.  When the SPL module is unloaded a list of all leaked
 497 dnl # addresses and where they were allocated will be dumped to the console.
 498 dnl # Enabling this feature has a significant impact on performance but it
 499 dnl # makes finding memory leaks pretty straight forward.
 500 dnl #
 501 AC_DEFUN([SPL_AC_DEBUG_KMEM_TRACKING], [
 502         AC_ARG_ENABLE([debug-kmem-tracking],
 503                 [AS_HELP_STRING([--enable-debug-kmem-tracking],
 504                 [Enable detailed kmem tracking  @<:@default=no@:>@])],
 505                 [],
 506                 [enable_debug_kmem_tracking=no])
 507
 508         AS_IF([test "x$enable_debug_kmem_tracking" = xyes],
 509         [
 510                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM_TRACKING"
 511                 DEBUG_KMEM_TRACKING="_with_debug_kmem_tracking"
 512                 AC_DEFINE([DEBUG_KMEM_TRACKING], [1],
 513                 [Define to 1 to enable detailed kmem tracking])
 514         ], [
 515                 DEBUG_KMEM_TRACKING="_without_debug_kmem_tracking"
 516         ])
 517
 518         AC_SUBST(DEBUG_KMEM_TRACKING)
 519         AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
 520         AC_MSG_RESULT([$enable_debug_kmem_tracking])
 521 ])
 522
 523 dnl #
 524 dnl # SPL_LINUX_CONFTEST
 525 dnl #
 526 AC_DEFUN([SPL_LINUX_CONFTEST], [
 527 cat confdefs.h - <<_ACEOF >conftest.c
 528 $1
 529 _ACEOF
 530 ])
 531
 532 dnl #
 533 dnl # SPL_LANG_PROGRAM(C)([PROLOGUE], [BODY])
 534 dnl #
 535 m4_define([SPL_LANG_PROGRAM], [
 536 $1
 537 int
 538 main (void)
 539 {
 540 dnl Do *not* indent the following line: there may be CPP directives.
 541 dnl Don't move the `;' right after for the same reason.
 542 $2
 543   ;
 544   return 0;
 545 }
 546 ])
 547
 548 dnl #
 549 dnl # SPL_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
 550 dnl #
 551 AC_DEFUN([SPL_LINUX_COMPILE_IFELSE], [
 552         m4_ifvaln([$1], [SPL_LINUX_CONFTEST([$1])])
 553         rm -Rf build && mkdir -p build && touch build/conftest.mod.c
 554         echo "obj-m := conftest.o" >build/Makefile
 555         modpost_flag=''
 556         test "x$enable_linux_builtin" = xyes && modpost_flag='modpost=true' # fake modpost stage
 557         AS_IF(
 558                 [AC_TRY_COMMAND(cp conftest.c build && make [$2] -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build $modpost_flag) >/dev/null && AC_TRY_COMMAND([$3])],
 559                 [$4],
 560                 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
 561         )
 562         rm -Rf build
 563 ])
 564
 565 dnl #
 566 dnl # SPL_LINUX_TRY_COMPILE like AC_TRY_COMPILE
 567 dnl #
 568 AC_DEFUN([SPL_LINUX_TRY_COMPILE],
 569         [SPL_LINUX_COMPILE_IFELSE(
 570         [AC_LANG_SOURCE([SPL_LANG_PROGRAM([[$1]], [[$2]])])],
 571         [modules],
 572         [test -s build/conftest.o],
 573         [$3], [$4])
 574 ])
 575
 576 dnl #
 577 dnl # SPL_CHECK_SYMBOL_EXPORT
 578 dnl # check symbol exported or not
 579 dnl #
 580 AC_DEFUN([SPL_CHECK_SYMBOL_EXPORT], [
 581         grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
 582                 $LINUX_OBJ/Module*.symvers 2>/dev/null
 583         rc=$?
 584         if test $rc -ne 0; then
 585                 export=0
 586                 for file in $2; do
 587                         grep -q -E "EXPORT_SYMBOL.*($1)" \
 588                                 "$LINUX_OBJ/$file" 2>/dev/null
 589                         rc=$?
 590                         if test $rc -eq 0; then
 591                                 export=1
 592                                 break;
 593                         fi
 594                 done
 595                 if test $export -eq 0; then :
 596                         $4
 597                 else :
 598                         $3
 599                 fi
 600         else :
 601                 $3
 602         fi
 603 ])
 604
 605 dnl #
 606 dnl # SPL_LINUX_TRY_COMPILE_SYMBOL
 607 dnl # like SPL_LINUX_TRY_COMPILE, except SPL_CHECK_SYMBOL_EXPORT
 608 dnl # is called if not compiling for builtin
 609 dnl #
 610 AC_DEFUN([SPL_LINUX_TRY_COMPILE_SYMBOL], [
 611         SPL_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
 612         if test $rc -ne 0; then :
 613                 $6
 614         else
 615                 if test "x$enable_linux_builtin" != xyes; then
 616                         SPL_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
 617                 fi
 618                 if test $rc -ne 0; then :
 619                         $6
 620                 else :
 621                         $5
 622                 fi
 623         fi
 624 ])
 625
 626 dnl #
 627 dnl # SPL_CHECK_SYMBOL_HEADER
 628 dnl # check if a symbol prototype is defined in listed headers.
 629 dnl #
 630 AC_DEFUN([SPL_CHECK_SYMBOL_HEADER], [
 631         AC_MSG_CHECKING([whether symbol $1 exists in header])
 632         header=0
 633         for file in $3; do
 634                 grep -q "$2" "$LINUX/$file" 2>/dev/null
 635                 rc=$?
 636                 if test $rc -eq 0; then
 637                         header=1
 638                         break;
 639                 fi
 640         done
 641         if test $header -eq 0; then
 642                 AC_MSG_RESULT([no])
 643                 $5
 644         else
 645                 AC_MSG_RESULT([yes])
 646                 $4
 647         fi
 648 ])
 649
 650 dnl #
 651 dnl # SPL_CHECK_HEADER
 652 dnl # check whether header exists and define HAVE_$2_HEADER
 653 dnl #
 654 AC_DEFUN([SPL_CHECK_HEADER],
 655         [AC_MSG_CHECKING([whether header $1 exists])
 656         SPL_LINUX_TRY_COMPILE([
 657                 #include <$1>
 658         ],[
 659                 return 0;
 660         ],[
 661                 AC_DEFINE(HAVE_$2_HEADER, 1, [$1 exists])
 662                 AC_MSG_RESULT(yes)
 663                 $3
 664         ],[
 665                 AC_MSG_RESULT(no)
 666                 $4
 667         ])
 668 ])
 669
 670 dnl #
 671 dnl # Basic toolchain sanity check.  Verify that kernel modules can
 672 dnl # be built and which symbols can be used.
 673 dnl #
 674 AC_DEFUN([SPL_AC_TEST_MODULE],
 675         [AC_MSG_CHECKING([whether modules can be built])
 676         SPL_LINUX_TRY_COMPILE([],[],[
 677                 AC_MSG_RESULT([yes])
 678         ],[
 679                 AC_MSG_RESULT([no])
 680                 if test "x$enable_linux_builtin" != xyes; then
 681                         AC_MSG_ERROR([*** Unable to build an empty module.])
 682                 else
 683                         AC_MSG_ERROR([
 684         *** Unable to build an empty module.
 685         *** Please run 'make scripts' inside the kernel source tree.])
 686                 fi
 687         ])
 688
 689         AS_IF([test "x$cross_compiling" != xyes], [
 690                 AC_RUN_IFELSE([
 691                         AC_LANG_PROGRAM([
 692                                 #include "$LINUX/include/linux/license.h"
 693                         ], [
 694                                 return !license_is_gpl_compatible(
 695                                     "$SPL_META_LICENSE");
 696                         ])
 697                 ], [
 698                         AC_DEFINE([SPL_IS_GPL_COMPATIBLE], [1],
 699                             [Define to 1 if GPL-only symbols can be used])
 700                 ], [
 701                 ])
 702         ])
 703 ])
 704
 705 dnl #
 706 dnl # Use the atomic implemenation based on global spinlocks.  This
 707 dnl # should only be needed by 32-bit kernels which do not provide
 708 dnl # the atomic64_* API.  It may be optionally enabled as a fallback
 709 dnl # if problems are observed with the direct mapping to the native
 710 dnl # Linux atomic operations.  You may not disable atomic spinlocks
 711 dnl # if you kernel does not an atomic64_* API.
 712 dnl #
 713 AC_DEFUN([SPL_AC_ATOMIC_SPINLOCK], [
 714         AC_ARG_ENABLE([atomic-spinlocks],
 715                 [AS_HELP_STRING([--enable-atomic-spinlocks],
 716                 [Atomic types use spinlocks @<:@default=check@:>@])],
 717                 [],
 718                 [enable_atomic_spinlocks=check])
 719
 720         SPL_LINUX_TRY_COMPILE([
 721                 #include <linux/fs.h>
 722         ],[
 723                 atomic64_t *ptr __attribute__ ((unused));
 724         ],[
 725                 have_atomic64_t=yes
 726                 AC_DEFINE(HAVE_ATOMIC64_T, 1,
 727                         [kernel defines atomic64_t])
 728         ],[
 729                 have_atomic64_t=no
 730         ])
 731
 732         AS_IF([test "x$enable_atomic_spinlocks" = xcheck], [
 733                 AS_IF([test "x$have_atomic64_t" = xyes], [
 734                         enable_atomic_spinlocks=no
 735                 ],[
 736                         enable_atomic_spinlocks=yes
 737                 ])
 738         ])
 739
 740         AS_IF([test "x$enable_atomic_spinlocks" = xyes], [
 741                 AC_DEFINE([ATOMIC_SPINLOCK], [1],
 742                         [Atomic types use spinlocks])
 743         ],[
 744                 AS_IF([test "x$have_atomic64_t" = xno], [
 745                         AC_MSG_FAILURE(
 746                         [--disable-atomic-spinlocks given but required atomic64 support is unavailable])
 747                 ])
 748         ])
 749
 750         AC_MSG_CHECKING([whether atomic types use spinlocks])
 751         AC_MSG_RESULT([$enable_atomic_spinlocks])
 752
 753         AC_MSG_CHECKING([whether kernel defines atomic64_t])
 754         AC_MSG_RESULT([$have_atomic64_t])
 755 ])