config/kernel.m4

   1 dnl #
   2 dnl # Default ZFS kernel configuration
   3 dnl #
   4 AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
   5         ZFS_AC_KERNEL
   6         ZFS_AC_SPL
   7         ZFS_AC_TEST_MODULE
   8         ZFS_AC_KERNEL_CONFIG
   9         ZFS_AC_KERNEL_DECLARE_EVENT_CLASS
  10         ZFS_AC_KERNEL_CURRENT_BIO_TAIL
  11         ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
  12         ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID
  13         ZFS_AC_KERNEL_TYPE_FMODE_T
  14         ZFS_AC_KERNEL_KOBJ_NAME_LEN
  15         ZFS_AC_KERNEL_3ARG_BLKDEV_GET
  16         ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH
  17         ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE
  18         ZFS_AC_KERNEL_LOOKUP_BDEV
  19         ZFS_AC_KERNEL_INVALIDATE_BDEV_ARGS
  20         ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE
  21         ZFS_AC_KERNEL_BDEV_PHYSICAL_BLOCK_SIZE
  22         ZFS_AC_KERNEL_BIO_BVEC_ITER
  23         ZFS_AC_KERNEL_BIO_FAILFAST_DTD
  24         ZFS_AC_KERNEL_REQ_FAILFAST_MASK
  25         ZFS_AC_KERNEL_BIO_END_IO_T_ARGS
  26         ZFS_AC_KERNEL_BIO_RW_BARRIER
  27         ZFS_AC_KERNEL_BIO_RW_DISCARD
  28         ZFS_AC_KERNEL_BIO_RW_SYNC
  29         ZFS_AC_KERNEL_BIO_RW_SYNCIO
  30         ZFS_AC_KERNEL_REQ_SYNC
  31         ZFS_AC_KERNEL_BLK_END_REQUEST
  32         ZFS_AC_KERNEL_BLK_QUEUE_FLUSH
  33         ZFS_AC_KERNEL_BLK_QUEUE_MAX_HW_SECTORS
  34         ZFS_AC_KERNEL_BLK_QUEUE_MAX_SEGMENTS
  35         ZFS_AC_KERNEL_BLK_QUEUE_NONROT
  36         ZFS_AC_KERNEL_BLK_QUEUE_DISCARD
  37         ZFS_AC_KERNEL_BLK_FETCH_REQUEST
  38         ZFS_AC_KERNEL_BLK_REQUEUE_REQUEST
  39         ZFS_AC_KERNEL_BLK_RQ_BYTES
  40         ZFS_AC_KERNEL_BLK_RQ_POS
  41         ZFS_AC_KERNEL_BLK_RQ_SECTORS
  42         ZFS_AC_KERNEL_GET_DISK_RO
  43         ZFS_AC_KERNEL_GET_GENDISK
  44         ZFS_AC_KERNEL_DISCARD_GRANULARITY
  45         ZFS_AC_KERNEL_CONST_XATTR_HANDLER
  46         ZFS_AC_KERNEL_XATTR_HANDLER_GET
  47         ZFS_AC_KERNEL_XATTR_HANDLER_SET
  48         ZFS_AC_KERNEL_XATTR_HANDLER_LIST
  49         ZFS_AC_KERNEL_INODE_OWNER_OR_CAPABLE
  50         ZFS_AC_KERNEL_POSIX_ACL_FROM_XATTR_USERNS
  51         ZFS_AC_KERNEL_POSIX_ACL_RELEASE
  52         ZFS_AC_KERNEL_POSIX_ACL_CHMOD
  53         ZFS_AC_KERNEL_POSIX_ACL_CACHING
  54         ZFS_AC_KERNEL_POSIX_ACL_EQUIV_MODE_WANTS_UMODE_T
  55         ZFS_AC_KERNEL_INODE_OPERATIONS_PERMISSION
  56         ZFS_AC_KERNEL_INODE_OPERATIONS_PERMISSION_WITH_NAMEIDATA
  57         ZFS_AC_KERNEL_INODE_OPERATIONS_CHECK_ACL
  58         ZFS_AC_KERNEL_INODE_OPERATIONS_CHECK_ACL_WITH_FLAGS
  59         ZFS_AC_KERNEL_INODE_OPERATIONS_GET_ACL
  60         ZFS_AC_KERNEL_CURRENT_UMASK
  61         ZFS_AC_KERNEL_SHOW_OPTIONS
  62         ZFS_AC_KERNEL_FILE_INODE
  63         ZFS_AC_KERNEL_FSYNC
  64         ZFS_AC_KERNEL_EVICT_INODE
  65         ZFS_AC_KERNEL_DIRTY_INODE_WITH_FLAGS
  66         ZFS_AC_KERNEL_NR_CACHED_OBJECTS
  67         ZFS_AC_KERNEL_FREE_CACHED_OBJECTS
  68         ZFS_AC_KERNEL_FALLOCATE
  69         ZFS_AC_KERNEL_MKDIR_UMODE_T
  70         ZFS_AC_KERNEL_LOOKUP_NAMEIDATA
  71         ZFS_AC_KERNEL_CREATE_NAMEIDATA
  72         ZFS_AC_KERNEL_FOLLOW_LINK
  73         ZFS_AC_KERNEL_PUT_LINK
  74         ZFS_AC_KERNEL_TRUNCATE_RANGE
  75         ZFS_AC_KERNEL_AUTOMOUNT
  76         ZFS_AC_KERNEL_ENCODE_FH_WITH_INODE
  77         ZFS_AC_KERNEL_COMMIT_METADATA
  78         ZFS_AC_KERNEL_CLEAR_INODE
  79         ZFS_AC_KERNEL_INSERT_INODE_LOCKED
  80         ZFS_AC_KERNEL_D_MAKE_ROOT
  81         ZFS_AC_KERNEL_D_OBTAIN_ALIAS
  82         ZFS_AC_KERNEL_D_PRUNE_ALIASES
  83         ZFS_AC_KERNEL_D_SET_D_OP
  84         ZFS_AC_KERNEL_D_REVALIDATE_NAMEIDATA
  85         ZFS_AC_KERNEL_CONST_DENTRY_OPERATIONS
  86         ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE
  87         ZFS_AC_KERNEL_TRUNCATE_SETSIZE
  88         ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY
  89         ZFS_AC_KERNEL_CALLBACK_SECURITY_INODE_INIT_SECURITY
  90         ZFS_AC_KERNEL_MOUNT_NODEV
  91         ZFS_AC_KERNEL_SHRINK
  92         ZFS_AC_KERNEL_SHRINK_CONTROL_HAS_NID
  93         ZFS_AC_KERNEL_S_INSTANCES_LIST_HEAD
  94         ZFS_AC_KERNEL_S_D_OP
  95         ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER
  96         ZFS_AC_KERNEL_SET_NLINK
  97         ZFS_AC_KERNEL_ELEVATOR_CHANGE
  98         ZFS_AC_KERNEL_5ARG_SGET
  99         ZFS_AC_KERNEL_LSEEK_EXECUTE
 100         ZFS_AC_KERNEL_VFS_ITERATE
 101         ZFS_AC_KERNEL_VFS_RW_ITERATE
 102         ZFS_AC_KERNEL_KMAP_ATOMIC_ARGS
 103         ZFS_AC_KERNEL_FOLLOW_DOWN_ONE
 104         ZFS_AC_KERNEL_MAKE_REQUEST_FN
 105
 106         AS_IF([test "$LINUX_OBJ" != "$LINUX"], [
 107                 KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
 108         ])
 109         AC_SUBST(KERNELMAKE_PARAMS)
 110
 111
 112         dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
 113         dnl # compiler options are added by the kernel build system.
 114         KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_UNUSED_BUT_SET_VARIABLE"
 115         KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_BOOL_COMPARE"
 116         KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
 117         KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
 118
 119         AC_SUBST(KERNELCPPFLAGS)
 120 ])
 121
 122 dnl #
 123 dnl # Detect name used for Module.symvers file in kernel
 124 dnl #
 125 AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
 126         modpost=$LINUX/scripts/Makefile.modpost
 127         AC_MSG_CHECKING([kernel file name for module symbols])
 128         AS_IF([test "x$enable_linux_builtin" != xyes -a -f "$modpost"], [
 129                 AS_IF([grep -q Modules.symvers $modpost], [
 130                         LINUX_SYMBOLS=Modules.symvers
 131                 ], [
 132                         LINUX_SYMBOLS=Module.symvers
 133                 ])
 134
 135                 AS_IF([test ! -f "$LINUX_OBJ/$LINUX_SYMBOLS"], [
 136                         AC_MSG_ERROR([
 137         *** Please make sure the kernel devel package for your distribution
 138         *** is installed.  If you are building with a custom kernel, make sure the
 139         *** kernel is configured, built, and the '--with-linux=PATH' configure
 140         *** option refers to the location of the kernel source.])
 141                 ])
 142         ], [
 143                 LINUX_SYMBOLS=NONE
 144         ])
 145         AC_MSG_RESULT($LINUX_SYMBOLS)
 146         AC_SUBST(LINUX_SYMBOLS)
 147 ])
 148
 149 dnl #
 150 dnl # Detect the kernel to be built against
 151 dnl #
 152 AC_DEFUN([ZFS_AC_KERNEL], [
 153         AC_ARG_WITH([linux],
 154                 AS_HELP_STRING([--with-linux=PATH],
 155                 [Path to kernel source]),
 156                 [kernelsrc="$withval"])
 157
 158         AC_ARG_WITH(linux-obj,
 159                 AS_HELP_STRING([--with-linux-obj=PATH],
 160                 [Path to kernel build objects]),
 161                 [kernelbuild="$withval"])
 162
 163         AC_MSG_CHECKING([kernel source directory])
 164         AS_IF([test -z "$kernelsrc"], [
 165                 AS_IF([test -e "/lib/modules/$(uname -r)/source"], [
 166                         headersdir="/lib/modules/$(uname -r)/source"
 167                         sourcelink=$(readlink -f "$headersdir")
 168                 ], [test -e "/lib/modules/$(uname -r)/build"], [
 169                         headersdir="/lib/modules/$(uname -r)/build"
 170                         sourcelink=$(readlink -f "$headersdir")
 171                 ], [
 172                         sourcelink=$(ls -1d /usr/src/kernels/* \
 173                                      /usr/src/linux-* \
 174                                      2>/dev/null | grep -v obj | tail -1)
 175                 ])
 176
 177                 AS_IF([test -n "$sourcelink" && test -e ${sourcelink}], [
 178                         kernelsrc=`readlink -f ${sourcelink}`
 179                 ], [
 180                         kernelsrc="[Not found]"
 181                 ])
 182         ], [
 183                 AS_IF([test "$kernelsrc" = "NONE"], [
 184                         kernsrcver=NONE
 185                 ])
 186         ])
 187
 188         AC_MSG_RESULT([$kernelsrc])
 189         AS_IF([test ! -d "$kernelsrc"], [
 190                 AC_MSG_ERROR([
 191         *** Please make sure the kernel devel package for your distribution
 192         *** is installed and then try again.  If that fails, you can specify the
 193         *** location of the kernel source with the '--with-linux=PATH' option.])
 194         ])
 195
 196         AC_MSG_CHECKING([kernel build directory])
 197         AS_IF([test -z "$kernelbuild"], [
 198                 AS_IF([test -e "/lib/modules/$(uname -r)/build"], [
 199                         kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
 200                 ], [test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}], [
 201                         kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
 202                 ], [test -d ${kernelsrc}-obj/${target_cpu}/default], [
 203                         kernelbuild=${kernelsrc}-obj/${target_cpu}/default
 204                 ], [test -d `dirname ${kernelsrc}`/build-${target_cpu}], [
 205                         kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
 206                 ], [
 207                         kernelbuild=${kernelsrc}
 208                 ])
 209         ])
 210         AC_MSG_RESULT([$kernelbuild])
 211
 212         AC_MSG_CHECKING([kernel source version])
 213         utsrelease1=$kernelbuild/include/linux/version.h
 214         utsrelease2=$kernelbuild/include/linux/utsrelease.h
 215         utsrelease3=$kernelbuild/include/generated/utsrelease.h
 216         AS_IF([test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1], [
 217                 utsrelease=linux/version.h
 218         ], [test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2], [
 219                 utsrelease=linux/utsrelease.h
 220         ], [test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3], [
 221                 utsrelease=generated/utsrelease.h
 222         ])
 223
 224         AS_IF([test "$utsrelease"], [
 225                 kernsrcver=`(echo "#include <$utsrelease>";
 226                              echo "kernsrcver=UTS_RELEASE") |
 227                              cpp -I $kernelbuild/include |
 228                              grep "^kernsrcver=" | cut -d \" -f 2`
 229
 230                 AS_IF([test -z "$kernsrcver"], [
 231                         AC_MSG_RESULT([Not found])
 232                         AC_MSG_ERROR([*** Cannot determine kernel version.])
 233                 ])
 234         ], [
 235                 AC_MSG_RESULT([Not found])
 236                 if test "x$enable_linux_builtin" != xyes; then
 237                         AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
 238                 else
 239                         AC_MSG_ERROR([
 240         *** Cannot find UTS_RELEASE definition.
 241         *** Please run 'make prepare' inside the kernel source tree.])
 242                 fi
 243         ])
 244
 245         AC_MSG_RESULT([$kernsrcver])
 246
 247         LINUX=${kernelsrc}
 248         LINUX_OBJ=${kernelbuild}
 249         LINUX_VERSION=${kernsrcver}
 250
 251         AC_SUBST(LINUX)
 252         AC_SUBST(LINUX_OBJ)
 253         AC_SUBST(LINUX_VERSION)
 254
 255         ZFS_AC_MODULE_SYMVERS
 256 ])
 257
 258
 259 dnl #
 260 dnl # Detect the SPL module to be built against
 261 dnl #
 262 AC_DEFUN([ZFS_AC_SPL], [
 263         AC_ARG_WITH([spl],
 264                 AS_HELP_STRING([--with-spl=PATH],
 265                 [Path to spl source]),
 266                 [splsrc="$withval"])
 267
 268         AC_ARG_WITH([spl-obj],
 269                 AS_HELP_STRING([--with-spl-obj=PATH],
 270                 [Path to spl build objects]),
 271                 [splbuild="$withval"])
 272
 273         AC_ARG_WITH([spl-timeout],
 274                 AS_HELP_STRING([--with-spl-timeout=SECS],
 275                 [Wait SECS for SPL header and symver file @<:@default=0@:>@]),
 276                 [timeout="$withval"], [timeout=0])
 277
 278         dnl #
 279         dnl # The existence of spl.release.in is used to identify a valid
 280         dnl # source directory.  In order of preference:
 281         dnl #
 282         splsrc0="/var/lib/dkms/spl/${VERSION}/build"
 283         splsrc1="/usr/local/src/spl-${VERSION}/${LINUX_VERSION}"
 284         splsrc2="/usr/local/src/spl-${VERSION}"
 285         splsrc3="/usr/src/spl-${VERSION}/${LINUX_VERSION}"
 286         splsrc4="/usr/src/spl-${VERSION}"
 287         splsrc5="../spl/"
 288         splsrc6="$LINUX"
 289
 290         AC_MSG_CHECKING([spl source directory])
 291         AS_IF([test -z "${splsrc}"], [
 292                 AS_IF([ test -e "${splsrc0}/spl.release.in"], [
 293                         splsrc=${splsrc0}
 294                 ], [ test -e "${splsrc1}/spl.release.in"], [
 295                         splsrc=${splsrc1}
 296                 ], [ test -e "${splsrc2}/spl.release.in"], [
 297                         splsrc=${splsrc2}
 298                 ], [ test -e "${splsrc3}/spl.release.in"], [
 299                         splsrc=$(readlink -f "${splsrc3}")
 300                 ], [ test -e "${splsrc4}/spl.release.in" ], [
 301                         splsrc=${splsrc4}
 302                 ], [ test -e "${splsrc5}/spl.release.in"], [
 303                         splsrc=$(readlink -f "${splsrc5}")
 304                 ], [ test -e "${splsrc6}/spl.release.in" ], [
 305                         splsrc=${splsrc6}
 306                 ], [
 307                         splsrc="[Not found]"
 308                 ])
 309         ], [
 310                 AS_IF([test "$splsrc" = "NONE"], [
 311                         splbuild=NONE
 312                         splsrcver=NONE
 313                 ])
 314         ])
 315
 316         AC_MSG_RESULT([$splsrc])
 317         AS_IF([ test ! -e "$splsrc/spl.release.in"], [
 318                 AC_MSG_ERROR([
 319         *** Please make sure the kmod spl devel package for your distribution
 320         *** is installed then try again.  If that fails you can specify the
 321         *** location of the spl source with the '--with-spl=PATH' option.])
 322         ])
 323
 324         dnl #
 325         dnl # The existence of the spl_config.h is used to identify a valid
 326         dnl # spl object directory.  In many cases the object and source
 327         dnl # directory are the same, however the objects may also reside
 328         dnl # is a subdirectory named after the kernel version.
 329         dnl #
 330         dnl # This file is supposed to be available after DKMS finishes
 331         dnl # building the SPL kernel module for the target kernel.  The
 332         dnl # '--with-spl-timeout' option can be passed to pause here,
 333         dnl # waiting for the file to appear from a concurrently building
 334         dnl # SPL package.
 335         dnl #
 336         AC_MSG_CHECKING([spl build directory])
 337         while true; do
 338                 AS_IF([test -z "$splbuild"], [
 339                         AS_IF([ test -e "${splsrc}/${LINUX_VERSION}/spl_config.h" ], [
 340                                 splbuild="${splsrc}/${LINUX_VERSION}"
 341                         ], [ test -e "${splsrc}/spl_config.h" ], [
 342                                 splbuild="${splsrc}"
 343                         ], [ find -L "${splsrc}" -name spl_config.h 2> /dev/null | grep -wq spl_config.h ], [
 344                                 splbuild=$(find -L "${splsrc}" -name spl_config.h | sed 's,/spl_config.h,,')
 345                         ], [
 346                                 splbuild="[Not found]"
 347                         ])
 348                 ])
 349                 AS_IF([test -e "$splbuild/spl_config.h" -o $timeout -le 0], [
 350                         break;
 351                 ], [
 352                         sleep 1
 353                         timeout=$((timeout-1))
 354                 ])
 355         done
 356
 357         AC_MSG_RESULT([$splbuild])
 358         AS_IF([ ! test -e "$splbuild/spl_config.h"], [
 359                 AC_MSG_ERROR([
 360         *** Please make sure the kmod spl devel <kernel> package for your
 361         *** distribution is installed then try again.  If that fails you
 362         *** can specify the location of the spl objects with the
 363         *** '--with-spl-obj=PATH' option.])
 364         ])
 365
 366         AC_MSG_CHECKING([spl source version])
 367         AS_IF([test -r $splbuild/spl_config.h &&
 368                 fgrep -q SPL_META_VERSION $splbuild/spl_config.h], [
 369
 370                 splsrcver=`(echo "#include <spl_config.h>";
 371                             echo "splsrcver=SPL_META_VERSION-SPL_META_RELEASE") |
 372                             cpp -I $splbuild |
 373                             grep "^splsrcver=" | tr -d \" | cut -d= -f2`
 374         ])
 375
 376         AS_IF([test -z "$splsrcver"], [
 377                 AC_MSG_RESULT([Not found])
 378                 AC_MSG_ERROR([
 379         *** Cannot determine the version of the spl source.
 380         *** Please prepare the spl source before running this script])
 381         ])
 382
 383         AC_MSG_RESULT([$splsrcver])
 384
 385         SPL=${splsrc}
 386         SPL_OBJ=${splbuild}
 387         SPL_VERSION=${splsrcver}
 388
 389         AC_SUBST(SPL)
 390         AC_SUBST(SPL_OBJ)
 391         AC_SUBST(SPL_VERSION)
 392
 393         dnl #
 394         dnl # Detect the name used for the SPL Module.symvers file.  If one
 395         dnl # does not exist this is likely because the SPL has been configured
 396         dnl # but not built.  The '--with-spl-timeout' option can be passed
 397         dnl # to pause here, waiting for the file to appear from a concurrently
 398         dnl # building SPL package.  If the file does not appear in time, a good
 399         dnl # guess is made as to what this file will be named based on what it
 400         dnl # is named in the kernel build products.  This file will first be
 401         dnl # used at link time so if the guess is wrong the build will fail
 402         dnl # then.  This unfortunately means the ZFS package does not contain a
 403         dnl # reliable mechanism to detect symbols exported by the SPL at
 404         dnl # configure time.
 405         dnl #
 406         AC_MSG_CHECKING([spl file name for module symbols])
 407         SPL_SYMBOLS=NONE
 408
 409         while true; do
 410                 AS_IF([test -r $SPL_OBJ/Module.symvers], [
 411                         SPL_SYMBOLS=Module.symvers
 412                 ], [test -r $SPL_OBJ/Modules.symvers], [
 413                         SPL_SYMBOLS=Modules.symvers
 414                 ], [test -r $SPL_OBJ/module/Module.symvers], [
 415                         SPL_SYMBOLS=Module.symvers
 416                 ], [test -r $SPL_OBJ/module/Modules.symvers], [
 417                         SPL_SYMBOLS=Modules.symvers
 418                 ])
 419
 420                 AS_IF([test $SPL_SYMBOLS != NONE -o $timeout -le 0], [
 421                         break;
 422                 ], [
 423                         sleep 1
 424                         timeout=$((timeout-1))
 425                 ])
 426         done
 427
 428         AS_IF([test "$SPL_SYMBOLS" = NONE], [
 429                 SPL_SYMBOLS=$LINUX_SYMBOLS
 430         ])
 431
 432         AC_MSG_RESULT([$SPL_SYMBOLS])
 433         AC_SUBST(SPL_SYMBOLS)
 434 ])
 435
 436 dnl #
 437 dnl # Basic toolchain sanity check.
 438 dnl #
 439 AC_DEFUN([ZFS_AC_TEST_MODULE], [
 440         AC_MSG_CHECKING([whether modules can be built])
 441         ZFS_LINUX_TRY_COMPILE([],[],[
 442                 AC_MSG_RESULT([yes])
 443         ],[
 444                 AC_MSG_RESULT([no])
 445                 if test "x$enable_linux_builtin" != xyes; then
 446                         AC_MSG_ERROR([*** Unable to build an empty module.])
 447                 else
 448                         AC_MSG_ERROR([
 449         *** Unable to build an empty module.
 450         *** Please run 'make scripts' inside the kernel source tree.])
 451                 fi
 452         ])
 453 ])
 454
 455 dnl #
 456 dnl # Certain kernel build options are not supported.  These must be
 457 dnl # detected at configure time and cause a build failure.  Otherwise
 458 dnl # modules may be successfully built that behave incorrectly.
 459 dnl #
 460 AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
 461         AC_RUN_IFELSE([
 462                 AC_LANG_PROGRAM([
 463                         #include "$LINUX/include/linux/license.h"
 464                 ], [
 465                         return !license_is_gpl_compatible("$ZFS_META_LICENSE");
 466                 ])
 467         ], [
 468                 AC_DEFINE([ZFS_IS_GPL_COMPATIBLE], [1],
 469                     [Define to 1 if GPL-only symbols can be used])
 470         ], [
 471         ])
 472
 473         ZFS_AC_KERNEL_CONFIG_DEBUG_LOCK_ALLOC
 474 ])
 475
 476 dnl #
 477 dnl # Check CONFIG_DEBUG_LOCK_ALLOC
 478 dnl #
 479 dnl # This is typically only set for debug kernels because it comes with
 480 dnl # a performance penalty.  However, when it is set it maps the non-GPL
 481 dnl # symbol mutex_lock() to the GPL-only mutex_lock_nested() symbol.
 482 dnl # This will cause a failure at link time which we'd rather know about
 483 dnl # at compile time.
 484 dnl #
 485 dnl # Since we plan to pursue making mutex_lock_nested() a non-GPL symbol
 486 dnl # with the upstream community we add a check to detect this case.
 487 dnl #
 488 AC_DEFUN([ZFS_AC_KERNEL_CONFIG_DEBUG_LOCK_ALLOC], [
 489
 490         ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC], [
 491                 AC_MSG_CHECKING([whether mutex_lock() is GPL-only])
 492                 tmp_flags="$EXTRA_KCFLAGS"
 493                 ZFS_LINUX_TRY_COMPILE([
 494                         #include <linux/module.h>
 495                         #include <linux/mutex.h>
 496
 497                         MODULE_LICENSE("$ZFS_META_LICENSE");
 498                 ],[
 499                         struct mutex lock;
 500
 501                         mutex_init(&lock);
 502                         mutex_lock(&lock);
 503                         mutex_unlock(&lock);
 504                 ],[
 505                         AC_MSG_RESULT(no)
 506                 ],[
 507                         AC_MSG_RESULT(yes)
 508                         AC_MSG_ERROR([
 509         *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is incompatible
 510         *** with the CDDL license and will prevent the module linking stage
 511         *** from succeeding.  You must rebuild your kernel without this
 512         *** option enabled.])
 513                 ])
 514                 EXTRA_KCFLAGS="$tmp_flags"
 515         ], [])
 516 ])
 517
 518 dnl #
 519 dnl # ZFS_LINUX_CONFTEST_H
 520 dnl #
 521 AC_DEFUN([ZFS_LINUX_CONFTEST_H], [
 522 cat - <<_ACEOF >conftest.h
 523 $1
 524 _ACEOF
 525 ])
 526
 527 dnl #
 528 dnl # ZFS_LINUX_CONFTEST_C
 529 dnl #
 530 AC_DEFUN([ZFS_LINUX_CONFTEST_C], [
 531 cat confdefs.h - <<_ACEOF >conftest.c
 532 $1
 533 _ACEOF
 534 ])
 535
 536 dnl #
 537 dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
 538 dnl #
 539 m4_define([ZFS_LANG_PROGRAM], [
 540 $1
 541 int
 542 main (void)
 543 {
 544 dnl Do *not* indent the following line: there may be CPP directives.
 545 dnl Don't move the `;' right after for the same reason.
 546 $2
 547   ;
 548   return 0;
 549 }
 550 ])
 551
 552 dnl #
 553 dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
 554 dnl #
 555 AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
 556         m4_ifvaln([$1], [ZFS_LINUX_CONFTEST_C([$1])])
 557         m4_ifvaln([$6], [ZFS_LINUX_CONFTEST_H([$6])], [ZFS_LINUX_CONFTEST_H([])])
 558         rm -Rf build && mkdir -p build && touch build/conftest.mod.c
 559         echo "obj-m := conftest.o" >build/Makefile
 560         modpost_flag=''
 561         test "x$enable_linux_builtin" = xyes && modpost_flag='modpost=true' # fake modpost stage
 562         AS_IF(
 563                 [AC_TRY_COMMAND(cp conftest.c conftest.h build && make [$2] -C $LINUX_OBJ EXTRA_CFLAGS="-Werror $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build $modpost_flag) >/dev/null && AC_TRY_COMMAND([$3])],
 564                 [$4],
 565                 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
 566         )
 567         rm -Rf build
 568 ])
 569
 570 dnl #
 571 dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
 572 dnl #
 573 AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
 574         [ZFS_LINUX_COMPILE_IFELSE(
 575         [AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
 576         [modules],
 577         [test -s build/conftest.o],
 578         [$3], [$4])
 579 ])
 580
 581 dnl #
 582 dnl # ZFS_LINUX_CONFIG
 583 dnl #
 584 AC_DEFUN([ZFS_LINUX_CONFIG],
 585         [AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
 586         ZFS_LINUX_TRY_COMPILE([
 587                 #include <linux/module.h>
 588         ],[
 589                 #ifndef CONFIG_$1
 590                 #error CONFIG_$1 not #defined
 591                 #endif
 592         ],[
 593                 AC_MSG_RESULT([yes])
 594                 $2
 595         ],[
 596                 AC_MSG_RESULT([no])
 597                 $3
 598         ])
 599 ])
 600
 601 dnl #
 602 dnl # ZFS_CHECK_SYMBOL_EXPORT
 603 dnl # check symbol exported or not
 604 dnl #
 605 AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT], [
 606         grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
 607                 $LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
 608         rc=$?
 609         if test $rc -ne 0; then
 610                 export=0
 611                 for file in $2; do
 612                         grep -q -E "EXPORT_SYMBOL.*($1)" \
 613                                 "$LINUX/$file" 2>/dev/null
 614                         rc=$?
 615                         if test $rc -eq 0; then
 616                                 export=1
 617                                 break;
 618                         fi
 619                 done
 620                 if test $export -eq 0; then :
 621                         $4
 622                 else :
 623                         $3
 624                 fi
 625         else :
 626                 $3
 627         fi
 628 ])
 629
 630 dnl #
 631 dnl # ZFS_LINUX_TRY_COMPILE_SYMBOL
 632 dnl # like ZFS_LINUX_TRY_COMPILE, except ZFS_CHECK_SYMBOL_EXPORT
 633 dnl # is called if not compiling for builtin
 634 dnl #
 635 AC_DEFUN([ZFS_LINUX_TRY_COMPILE_SYMBOL], [
 636         ZFS_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
 637         if test $rc -ne 0; then :
 638                 $6
 639         else
 640                 if test "x$enable_linux_builtin" != xyes; then
 641                         ZFS_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
 642                 fi
 643                 if test $rc -ne 0; then :
 644                         $6
 645                 else :
 646                         $5
 647                 fi
 648         fi
 649 ])
 650
 651 dnl #
 652 dnl # ZFS_LINUX_TRY_COMPILE_HEADER
 653 dnl # like ZFS_LINUX_TRY_COMPILE, except the contents conftest.h are
 654 dnl # provided via the fifth parameter
 655 dnl #
 656 AC_DEFUN([ZFS_LINUX_TRY_COMPILE_HEADER],
 657         [ZFS_LINUX_COMPILE_IFELSE(
 658         [AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
 659         [modules],
 660         [test -s build/conftest.o],
 661         [$3], [$4], [$5])
 662 ])