config/kernel.m4

   1 dnl #
   2 dnl # Default ZFS kernel configuration
   3 dnl #
   4 AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
   5         AM_COND_IF([BUILD_LINUX], [
   6                 dnl # Setup the kernel build environment.
   7                 ZFS_AC_KERNEL
   8                 ZFS_AC_QAT
   9
  10                 dnl # Sanity checks for module building and CONFIG_* defines
  11                 ZFS_AC_KERNEL_CONFIG_DEFINED
  12                 ZFS_AC_MODULE_SYMVERS
  13
  14                 dnl # Sequential ZFS_LINUX_TRY_COMPILE tests
  15                 ZFS_AC_KERNEL_FPU_HEADER
  16                 ZFS_AC_KERNEL_OBJTOOL_HEADER
  17                 ZFS_AC_KERNEL_WAIT_QUEUE_ENTRY_T
  18                 ZFS_AC_KERNEL_MISC_MINOR
  19                 ZFS_AC_KERNEL_DECLARE_EVENT_CLASS
  20
  21                 dnl # Parallel ZFS_LINUX_TEST_SRC / ZFS_LINUX_TEST_RESULT tests
  22                 ZFS_AC_KERNEL_TEST_SRC
  23                 ZFS_AC_KERNEL_TEST_RESULT
  24
  25                 AS_IF([test "$LINUX_OBJ" != "$LINUX"], [
  26                         KERNEL_MAKE="$KERNEL_MAKE O=$LINUX_OBJ"
  27                 ])
  28
  29                 AC_SUBST(KERNEL_MAKE)
  30         ])
  31 ])
  32
  33 dnl #
  34 dnl # Generate and compile all of the kernel API test cases to determine
  35 dnl # which interfaces are available.  By invoking the kernel build system
  36 dnl # only once the compilation can be done in parallel significantly
  37 dnl # speeding up the process.
  38 dnl #
  39 AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
  40         ZFS_AC_KERNEL_SRC_OBJTOOL
  41         ZFS_AC_KERNEL_SRC_GLOBAL_PAGE_STATE
  42         ZFS_AC_KERNEL_SRC_ACCESS_OK_TYPE
  43         ZFS_AC_KERNEL_SRC_PDE_DATA
  44         ZFS_AC_KERNEL_SRC_FALLOCATE
  45         ZFS_AC_KERNEL_SRC_FADVISE
  46         ZFS_AC_KERNEL_SRC_GENERIC_FADVISE
  47         ZFS_AC_KERNEL_SRC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
  48         ZFS_AC_KERNEL_SRC_RWSEM
  49         ZFS_AC_KERNEL_SRC_SCHED
  50         ZFS_AC_KERNEL_SRC_USLEEP_RANGE
  51         ZFS_AC_KERNEL_SRC_KMEM_CACHE
  52         ZFS_AC_KERNEL_SRC_KVMALLOC
  53         ZFS_AC_KERNEL_SRC_VMALLOC_PAGE_KERNEL
  54         ZFS_AC_KERNEL_SRC_WAIT
  55         ZFS_AC_KERNEL_SRC_INODE_TIMES
  56         ZFS_AC_KERNEL_SRC_INODE_LOCK
  57         ZFS_AC_KERNEL_SRC_GROUP_INFO_GID
  58         ZFS_AC_KERNEL_SRC_RW
  59         ZFS_AC_KERNEL_SRC_TIMER_SETUP
  60         ZFS_AC_KERNEL_SRC_SUPER_USER_NS
  61         ZFS_AC_KERNEL_SRC_PROC_OPERATIONS
  62         ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS
  63         ZFS_AC_KERNEL_SRC_BIO
  64         ZFS_AC_KERNEL_SRC_BLKDEV
  65         ZFS_AC_KERNEL_SRC_BLK_QUEUE
  66         ZFS_AC_KERNEL_SRC_GENHD_FLAGS
  67         ZFS_AC_KERNEL_SRC_REVALIDATE_DISK
  68         ZFS_AC_KERNEL_SRC_GET_DISK_RO
  69         ZFS_AC_KERNEL_SRC_GENERIC_READLINK_GLOBAL
  70         ZFS_AC_KERNEL_SRC_DISCARD_GRANULARITY
  71         ZFS_AC_KERNEL_SRC_INODE_OWNER_OR_CAPABLE
  72         ZFS_AC_KERNEL_SRC_XATTR
  73         ZFS_AC_KERNEL_SRC_ACL
  74         ZFS_AC_KERNEL_SRC_INODE_SETATTR
  75         ZFS_AC_KERNEL_SRC_INODE_GETATTR
  76         ZFS_AC_KERNEL_SRC_INODE_SET_FLAGS
  77         ZFS_AC_KERNEL_SRC_INODE_SET_IVERSION
  78         ZFS_AC_KERNEL_SRC_SHOW_OPTIONS
  79         ZFS_AC_KERNEL_SRC_FILE_INODE
  80         ZFS_AC_KERNEL_SRC_FILE_DENTRY
  81         ZFS_AC_KERNEL_SRC_FSYNC
  82         ZFS_AC_KERNEL_SRC_AIO_FSYNC
  83         ZFS_AC_KERNEL_SRC_EVICT_INODE
  84         ZFS_AC_KERNEL_SRC_DIRTY_INODE
  85         ZFS_AC_KERNEL_SRC_SHRINKER
  86         ZFS_AC_KERNEL_SRC_MKDIR
  87         ZFS_AC_KERNEL_SRC_LOOKUP_FLAGS
  88         ZFS_AC_KERNEL_SRC_CREATE
  89         ZFS_AC_KERNEL_SRC_PERMISSION
  90         ZFS_AC_KERNEL_SRC_GET_LINK
  91         ZFS_AC_KERNEL_SRC_PUT_LINK
  92         ZFS_AC_KERNEL_SRC_TMPFILE
  93         ZFS_AC_KERNEL_SRC_AUTOMOUNT
  94         ZFS_AC_KERNEL_SRC_ENCODE_FH_WITH_INODE
  95         ZFS_AC_KERNEL_SRC_COMMIT_METADATA
  96         ZFS_AC_KERNEL_SRC_CLEAR_INODE
  97         ZFS_AC_KERNEL_SRC_SETATTR_PREPARE
  98         ZFS_AC_KERNEL_SRC_INSERT_INODE_LOCKED
  99         ZFS_AC_KERNEL_SRC_DENTRY
 100         ZFS_AC_KERNEL_SRC_DENTRY_ALIAS_D_U
 101         ZFS_AC_KERNEL_SRC_TRUNCATE_SETSIZE
 102         ZFS_AC_KERNEL_SRC_SECURITY_INODE
 103         ZFS_AC_KERNEL_SRC_FST_MOUNT
 104         ZFS_AC_KERNEL_SRC_BDI
 105         ZFS_AC_KERNEL_SRC_SET_NLINK
 106         ZFS_AC_KERNEL_SRC_SGET
 107         ZFS_AC_KERNEL_SRC_LSEEK_EXECUTE
 108         ZFS_AC_KERNEL_SRC_VFS_FILEMAP_DIRTY_FOLIO
 109         ZFS_AC_KERNEL_SRC_VFS_READ_FOLIO
 110         ZFS_AC_KERNEL_SRC_VFS_GETATTR
 111         ZFS_AC_KERNEL_SRC_VFS_FSYNC_2ARGS
 112         ZFS_AC_KERNEL_SRC_VFS_ITERATE
 113         ZFS_AC_KERNEL_SRC_VFS_DIRECT_IO
 114         ZFS_AC_KERNEL_SRC_VFS_READPAGES
 115         ZFS_AC_KERNEL_SRC_VFS_SET_PAGE_DIRTY_NOBUFFERS
 116         ZFS_AC_KERNEL_SRC_VFS_RW_ITERATE
 117         ZFS_AC_KERNEL_SRC_VFS_GENERIC_WRITE_CHECKS
 118         ZFS_AC_KERNEL_SRC_VFS_IOV_ITER
 119         ZFS_AC_KERNEL_SRC_VFS_COPY_FILE_RANGE
 120         ZFS_AC_KERNEL_SRC_VFS_GENERIC_COPY_FILE_RANGE
 121         ZFS_AC_KERNEL_SRC_VFS_REMAP_FILE_RANGE
 122         ZFS_AC_KERNEL_SRC_VFS_CLONE_FILE_RANGE
 123         ZFS_AC_KERNEL_SRC_VFS_DEDUPE_FILE_RANGE
 124         ZFS_AC_KERNEL_SRC_VFS_FILE_OPERATIONS_EXTEND
 125         ZFS_AC_KERNEL_SRC_KMAP_ATOMIC_ARGS
 126         ZFS_AC_KERNEL_SRC_FOLLOW_DOWN_ONE
 127         ZFS_AC_KERNEL_SRC_MAKE_REQUEST_FN
 128         ZFS_AC_KERNEL_SRC_GENERIC_IO_ACCT
 129         ZFS_AC_KERNEL_SRC_FPU
 130         ZFS_AC_KERNEL_SRC_FMODE_T
 131         ZFS_AC_KERNEL_SRC_KUIDGID_T
 132         ZFS_AC_KERNEL_SRC_KUID_HELPERS
 133         ZFS_AC_KERNEL_SRC_RENAME
 134         ZFS_AC_KERNEL_SRC_CURRENT_TIME
 135         ZFS_AC_KERNEL_SRC_USERNS_CAPABILITIES
 136         ZFS_AC_KERNEL_SRC_IN_COMPAT_SYSCALL
 137         ZFS_AC_KERNEL_SRC_KTIME
 138         ZFS_AC_KERNEL_SRC_TOTALRAM_PAGES_FUNC
 139         ZFS_AC_KERNEL_SRC_TOTALHIGH_PAGES
 140         ZFS_AC_KERNEL_SRC_KSTRTOUL
 141         ZFS_AC_KERNEL_SRC_PERCPU
 142         ZFS_AC_KERNEL_SRC_CPU_HOTPLUG
 143         ZFS_AC_KERNEL_SRC_GENERIC_FILLATTR
 144         ZFS_AC_KERNEL_SRC_MKNOD
 145         ZFS_AC_KERNEL_SRC_SYMLINK
 146         ZFS_AC_KERNEL_SRC_BIO_MAX_SEGS
 147         ZFS_AC_KERNEL_SRC_SIGNAL_STOP
 148         ZFS_AC_KERNEL_SRC_SIGINFO
 149         ZFS_AC_KERNEL_SRC_SYSFS
 150         ZFS_AC_KERNEL_SRC_SET_SPECIAL_STATE
 151         ZFS_AC_KERNEL_SRC_STANDALONE_LINUX_STDARG
 152         ZFS_AC_KERNEL_SRC_PAGEMAP_FOLIO_WAIT_BIT
 153         ZFS_AC_KERNEL_SRC_ADD_DISK
 154         ZFS_AC_KERNEL_SRC_KTHREAD
 155         ZFS_AC_KERNEL_SRC_ZERO_PAGE
 156         ZFS_AC_KERNEL_SRC___COPY_FROM_USER_INATOMIC
 157         ZFS_AC_KERNEL_SRC_USER_NS_COMMON_INUM
 158         ZFS_AC_KERNEL_SRC_IDMAP_MNT_API
 159         ZFS_AC_KERNEL_SRC_IATTR_VFSID
 160         ZFS_AC_KERNEL_SRC_FILEMAP
 161         ZFS_AC_KERNEL_SRC_WRITEPAGE_T
 162         ZFS_AC_KERNEL_SRC_RECLAIMED
 163         ZFS_AC_KERNEL_SRC_REGISTER_SYSCTL_TABLE
 164         ZFS_AC_KERNEL_SRC_COPY_SPLICE_READ
 165         ZFS_AC_KERNEL_SRC_SYNC_BDEV
 166         case "$host_cpu" in
 167                 powerpc*)
 168                         ZFS_AC_KERNEL_SRC_CPU_HAS_FEATURE
 169                         ZFS_AC_KERNEL_SRC_FLUSH_DCACHE_PAGE
 170                         ;;
 171                 riscv*)
 172                         ZFS_AC_KERNEL_SRC_FLUSH_DCACHE_PAGE
 173                         ;;
 174         esac
 175
 176         AC_MSG_CHECKING([for available kernel interfaces])
 177         ZFS_LINUX_TEST_COMPILE_ALL([kabi])
 178         AC_MSG_RESULT([done])
 179 ])
 180
 181 dnl #
 182 dnl # Check results of kernel interface tests.
 183 dnl #
 184 AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
 185         ZFS_AC_KERNEL_ACCESS_OK_TYPE
 186         ZFS_AC_KERNEL_GLOBAL_PAGE_STATE
 187         ZFS_AC_KERNEL_OBJTOOL
 188         ZFS_AC_KERNEL_PDE_DATA
 189         ZFS_AC_KERNEL_FALLOCATE
 190         ZFS_AC_KERNEL_FADVISE
 191         ZFS_AC_KERNEL_GENERIC_FADVISE
 192         ZFS_AC_KERNEL_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
 193         ZFS_AC_KERNEL_RWSEM
 194         ZFS_AC_KERNEL_SCHED
 195         ZFS_AC_KERNEL_USLEEP_RANGE
 196         ZFS_AC_KERNEL_KMEM_CACHE
 197         ZFS_AC_KERNEL_KVMALLOC
 198         ZFS_AC_KERNEL_VMALLOC_PAGE_KERNEL
 199         ZFS_AC_KERNEL_WAIT
 200         ZFS_AC_KERNEL_INODE_TIMES
 201         ZFS_AC_KERNEL_INODE_LOCK
 202         ZFS_AC_KERNEL_GROUP_INFO_GID
 203         ZFS_AC_KERNEL_RW
 204         ZFS_AC_KERNEL_TIMER_SETUP
 205         ZFS_AC_KERNEL_SUPER_USER_NS
 206         ZFS_AC_KERNEL_PROC_OPERATIONS
 207         ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS
 208         ZFS_AC_KERNEL_BIO
 209         ZFS_AC_KERNEL_BLKDEV
 210         ZFS_AC_KERNEL_BLK_QUEUE
 211         ZFS_AC_KERNEL_GENHD_FLAGS
 212         ZFS_AC_KERNEL_REVALIDATE_DISK
 213         ZFS_AC_KERNEL_GET_DISK_RO
 214         ZFS_AC_KERNEL_GENERIC_READLINK_GLOBAL
 215         ZFS_AC_KERNEL_DISCARD_GRANULARITY
 216         ZFS_AC_KERNEL_INODE_OWNER_OR_CAPABLE
 217         ZFS_AC_KERNEL_XATTR
 218         ZFS_AC_KERNEL_ACL
 219         ZFS_AC_KERNEL_INODE_SETATTR
 220         ZFS_AC_KERNEL_INODE_GETATTR
 221         ZFS_AC_KERNEL_INODE_SET_FLAGS
 222         ZFS_AC_KERNEL_INODE_SET_IVERSION
 223         ZFS_AC_KERNEL_SHOW_OPTIONS
 224         ZFS_AC_KERNEL_FILE_INODE
 225         ZFS_AC_KERNEL_FILE_DENTRY
 226         ZFS_AC_KERNEL_FSYNC
 227         ZFS_AC_KERNEL_AIO_FSYNC
 228         ZFS_AC_KERNEL_EVICT_INODE
 229         ZFS_AC_KERNEL_DIRTY_INODE
 230         ZFS_AC_KERNEL_SHRINKER
 231         ZFS_AC_KERNEL_MKDIR
 232         ZFS_AC_KERNEL_LOOKUP_FLAGS
 233         ZFS_AC_KERNEL_CREATE
 234         ZFS_AC_KERNEL_PERMISSION
 235         ZFS_AC_KERNEL_GET_LINK
 236         ZFS_AC_KERNEL_PUT_LINK
 237         ZFS_AC_KERNEL_TMPFILE
 238         ZFS_AC_KERNEL_AUTOMOUNT
 239         ZFS_AC_KERNEL_ENCODE_FH_WITH_INODE
 240         ZFS_AC_KERNEL_COMMIT_METADATA
 241         ZFS_AC_KERNEL_CLEAR_INODE
 242         ZFS_AC_KERNEL_SETATTR_PREPARE
 243         ZFS_AC_KERNEL_INSERT_INODE_LOCKED
 244         ZFS_AC_KERNEL_DENTRY
 245         ZFS_AC_KERNEL_DENTRY_ALIAS_D_U
 246         ZFS_AC_KERNEL_TRUNCATE_SETSIZE
 247         ZFS_AC_KERNEL_SECURITY_INODE
 248         ZFS_AC_KERNEL_FST_MOUNT
 249         ZFS_AC_KERNEL_BDI
 250         ZFS_AC_KERNEL_SET_NLINK
 251         ZFS_AC_KERNEL_SGET
 252         ZFS_AC_KERNEL_LSEEK_EXECUTE
 253         ZFS_AC_KERNEL_VFS_FILEMAP_DIRTY_FOLIO
 254         ZFS_AC_KERNEL_VFS_READ_FOLIO
 255         ZFS_AC_KERNEL_VFS_GETATTR
 256         ZFS_AC_KERNEL_VFS_FSYNC_2ARGS
 257         ZFS_AC_KERNEL_VFS_ITERATE
 258         ZFS_AC_KERNEL_VFS_DIRECT_IO
 259         ZFS_AC_KERNEL_VFS_READPAGES
 260         ZFS_AC_KERNEL_VFS_SET_PAGE_DIRTY_NOBUFFERS
 261         ZFS_AC_KERNEL_VFS_RW_ITERATE
 262         ZFS_AC_KERNEL_VFS_GENERIC_WRITE_CHECKS
 263         ZFS_AC_KERNEL_VFS_IOV_ITER
 264         ZFS_AC_KERNEL_VFS_COPY_FILE_RANGE
 265         ZFS_AC_KERNEL_VFS_GENERIC_COPY_FILE_RANGE
 266         ZFS_AC_KERNEL_VFS_REMAP_FILE_RANGE
 267         ZFS_AC_KERNEL_VFS_CLONE_FILE_RANGE
 268         ZFS_AC_KERNEL_VFS_DEDUPE_FILE_RANGE
 269         ZFS_AC_KERNEL_VFS_FILE_OPERATIONS_EXTEND
 270         ZFS_AC_KERNEL_KMAP_ATOMIC_ARGS
 271         ZFS_AC_KERNEL_FOLLOW_DOWN_ONE
 272         ZFS_AC_KERNEL_MAKE_REQUEST_FN
 273         ZFS_AC_KERNEL_GENERIC_IO_ACCT
 274         ZFS_AC_KERNEL_FPU
 275         ZFS_AC_KERNEL_FMODE_T
 276         ZFS_AC_KERNEL_KUIDGID_T
 277         ZFS_AC_KERNEL_KUID_HELPERS
 278         ZFS_AC_KERNEL_RENAME
 279         ZFS_AC_KERNEL_CURRENT_TIME
 280         ZFS_AC_KERNEL_USERNS_CAPABILITIES
 281         ZFS_AC_KERNEL_IN_COMPAT_SYSCALL
 282         ZFS_AC_KERNEL_KTIME
 283         ZFS_AC_KERNEL_TOTALRAM_PAGES_FUNC
 284         ZFS_AC_KERNEL_TOTALHIGH_PAGES
 285         ZFS_AC_KERNEL_KSTRTOUL
 286         ZFS_AC_KERNEL_PERCPU
 287         ZFS_AC_KERNEL_CPU_HOTPLUG
 288         ZFS_AC_KERNEL_GENERIC_FILLATTR
 289         ZFS_AC_KERNEL_MKNOD
 290         ZFS_AC_KERNEL_SYMLINK
 291         ZFS_AC_KERNEL_BIO_MAX_SEGS
 292         ZFS_AC_KERNEL_SIGNAL_STOP
 293         ZFS_AC_KERNEL_SIGINFO
 294         ZFS_AC_KERNEL_SYSFS
 295         ZFS_AC_KERNEL_SET_SPECIAL_STATE
 296         ZFS_AC_KERNEL_STANDALONE_LINUX_STDARG
 297         ZFS_AC_KERNEL_PAGEMAP_FOLIO_WAIT_BIT
 298         ZFS_AC_KERNEL_ADD_DISK
 299         ZFS_AC_KERNEL_KTHREAD
 300         ZFS_AC_KERNEL_ZERO_PAGE
 301         ZFS_AC_KERNEL___COPY_FROM_USER_INATOMIC
 302         ZFS_AC_KERNEL_USER_NS_COMMON_INUM
 303         ZFS_AC_KERNEL_IDMAP_MNT_API
 304         ZFS_AC_KERNEL_IATTR_VFSID
 305         ZFS_AC_KERNEL_FILEMAP
 306         ZFS_AC_KERNEL_WRITEPAGE_T
 307         ZFS_AC_KERNEL_RECLAIMED
 308         ZFS_AC_KERNEL_REGISTER_SYSCTL_TABLE
 309         ZFS_AC_KERNEL_COPY_SPLICE_READ
 310         ZFS_AC_KERNEL_SYNC_BDEV
 311         case "$host_cpu" in
 312                 powerpc*)
 313                         ZFS_AC_KERNEL_CPU_HAS_FEATURE
 314                         ZFS_AC_KERNEL_FLUSH_DCACHE_PAGE
 315                         ;;
 316                 riscv*)
 317                         ZFS_AC_KERNEL_FLUSH_DCACHE_PAGE
 318                         ;;
 319         esac
 320 ])
 321
 322 dnl #
 323 dnl # Detect name used for Module.symvers file in kernel
 324 dnl #
 325 AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
 326         modpost=$LINUX/scripts/Makefile.modpost
 327         AC_MSG_CHECKING([kernel file name for module symbols])
 328         AS_IF([test "x$enable_linux_builtin" != xyes -a -f "$modpost"], [
 329                 AS_IF([grep -q Modules.symvers $modpost], [
 330                         LINUX_SYMBOLS=Modules.symvers
 331                 ], [
 332                         LINUX_SYMBOLS=Module.symvers
 333                 ])
 334
 335                 AS_IF([test ! -f "$LINUX_OBJ/$LINUX_SYMBOLS"], [
 336                         AC_MSG_ERROR([
 337         *** Please make sure the kernel devel package for your distribution
 338         *** is installed.  If you are building with a custom kernel, make sure
 339         *** the kernel is configured, built, and the '--with-linux=PATH'
 340         *** configure option refers to the location of the kernel source.
 341                         ])
 342                 ])
 343         ], [
 344                 LINUX_SYMBOLS=NONE
 345         ])
 346         AC_MSG_RESULT($LINUX_SYMBOLS)
 347         AC_SUBST(LINUX_SYMBOLS)
 348 ])
 349
 350 dnl #
 351 dnl # Detect the kernel to be built against
 352 dnl #
 353 dnl # Most modern Linux distributions have separate locations for bare
 354 dnl # source (source) and prebuilt (build) files. Additionally, there are
 355 dnl # `source` and `build` symlinks in `/lib/modules/$(KERNEL_VERSION)`
 356 dnl # pointing to them. The directory search order is now:
 357 dnl #
 358 dnl # - `configure` command line values if both `--with-linux` and
 359 dnl #   `--with-linux-obj` were defined
 360 dnl #
 361 dnl # - If only `--with-linux` was defined, `--with-linux-obj` is assumed
 362 dnl #   to have the same value as `--with-linux`
 363 dnl #
 364 dnl # - If neither `--with-linux` nor `--with-linux-obj` were defined
 365 dnl #   autodetection is used:
 366 dnl #
 367 dnl #   - `/lib/modules/$(uname -r)/{source,build}` respectively, if exist.
 368 dnl #
 369 dnl #   - If only `/lib/modules/$(uname -r)/build` exists, it is assumed
 370 dnl #     to be both source and build directory.
 371 dnl #
 372 dnl #   - The first directory in `/lib/modules` with the highest version
 373 dnl #     number according to `sort -V` which contains both `source` and
 374 dnl #     `build` symlinks/directories. If module directory contains only
 375 dnl #     `build` component, it is assumed to be both source and build
 376 dnl #     directory.
 377 dnl #
 378 dnl #   - Last resort: the first directory matching `/usr/src/kernels/*`
 379 dnl #     and `/usr/src/linux-*` with the highest version number according
 380 dnl #     to `sort -V` is assumed to be both source and build directory.
 381 dnl #
 382 AC_DEFUN([ZFS_AC_KERNEL], [
 383         AC_ARG_WITH([linux],
 384                 AS_HELP_STRING([--with-linux=PATH],
 385                 [Path to kernel source]),
 386                 [kernelsrc="$withval"])
 387
 388         AC_ARG_WITH(linux-obj,
 389                 AS_HELP_STRING([--with-linux-obj=PATH],
 390                 [Path to kernel build objects]),
 391                 [kernelbuild="$withval"])
 392
 393         AC_MSG_CHECKING([kernel source and build directories])
 394         AS_IF([test -n "$kernelsrc" && test -z "$kernelbuild"], [
 395                 kernelbuild="$kernelsrc"
 396         ], [test -z "$kernelsrc"], [
 397                 AS_IF([test -e "/lib/modules/$(uname -r)/source" && \
 398                        test -e "/lib/modules/$(uname -r)/build"], [
 399                         src="/lib/modules/$(uname -r)/source"
 400                         build="/lib/modules/$(uname -r)/build"
 401                 ], [test -e "/lib/modules/$(uname -r)/build"], [
 402                         build="/lib/modules/$(uname -r)/build"
 403                         src="$build"
 404                 ], [
 405                         src=
 406
 407                         for d in $(ls -1d /lib/modules/* 2>/dev/null | sort -Vr); do
 408                                 if test -e "$d/source" && test -e "$d/build"; then
 409                                         src="$d/source"
 410                                         build="$d/build"
 411                                         break
 412                                 fi
 413
 414                                 if test -e "$d/build"; then
 415                                         src="$d/build"
 416                                         build="$d/build"
 417                                         break
 418                                 fi
 419                         done
 420
 421                         # the least reliable method
 422                         if test -z "$src"; then
 423                                 src=$(ls -1d /usr/src/kernels/* /usr/src/linux-* \
 424                                       2>/dev/null | grep -v obj | sort -Vr | head -1)
 425                                 build="$src"
 426                         fi
 427                 ])
 428
 429                 AS_IF([test -n "$src" && test -e "$src"], [
 430                         kernelsrc=$(readlink -e "$src")
 431                 ], [
 432                         kernelsrc="[Not found]"
 433                 ])
 434                 AS_IF([test -n "$build" && test -e "$build"], [
 435                         kernelbuild=$(readlink -e "$build")
 436                 ], [
 437                         kernelbuild="[Not found]"
 438                 ])
 439         ], [
 440                 AS_IF([test "$kernelsrc" = "NONE"], [
 441                         kernsrcver=NONE
 442                 ])
 443                 withlinux=yes
 444         ])
 445
 446         AC_MSG_RESULT([done])
 447         AC_MSG_CHECKING([kernel source directory])
 448         AC_MSG_RESULT([$kernelsrc])
 449         AC_MSG_CHECKING([kernel build directory])
 450         AC_MSG_RESULT([$kernelbuild])
 451         AS_IF([test ! -d "$kernelsrc" || test ! -d "$kernelbuild"], [
 452                 AC_MSG_ERROR([
 453         *** Please make sure the kernel devel package for your distribution
 454         *** is installed and then try again.  If that fails, you can specify the
 455         *** location of the kernel source and build with the '--with-linux=PATH' and
 456         *** '--with-linux-obj=PATH' options respectively.])
 457         ])
 458
 459         AC_MSG_CHECKING([kernel source version])
 460         utsrelease1=$kernelbuild/include/linux/version.h
 461         utsrelease2=$kernelbuild/include/linux/utsrelease.h
 462         utsrelease3=$kernelbuild/include/generated/utsrelease.h
 463         AS_IF([test -r $utsrelease1 && grep -qF UTS_RELEASE $utsrelease1], [
 464                 utsrelease=$utsrelease1
 465         ], [test -r $utsrelease2 && grep -qF UTS_RELEASE $utsrelease2], [
 466                 utsrelease=$utsrelease2
 467         ], [test -r $utsrelease3 && grep -qF UTS_RELEASE $utsrelease3], [
 468                 utsrelease=$utsrelease3
 469         ])
 470
 471         AS_IF([test -n "$utsrelease"], [
 472                 kernsrcver=$($AWK '/UTS_RELEASE/ { gsub(/"/, "", $[3]); print $[3] }' $utsrelease)
 473                 AS_IF([test -z "$kernsrcver"], [
 474                         AC_MSG_RESULT([Not found])
 475                         AC_MSG_ERROR([
 476         *** Cannot determine kernel version.
 477                         ])
 478                 ])
 479         ], [
 480                 AC_MSG_RESULT([Not found])
 481                 if test "x$enable_linux_builtin" != xyes; then
 482                         AC_MSG_ERROR([
 483         *** Cannot find UTS_RELEASE definition.
 484                         ])
 485                 else
 486                         AC_MSG_ERROR([
 487         *** Cannot find UTS_RELEASE definition.
 488         *** Please run 'make prepare' inside the kernel source tree.])
 489                 fi
 490         ])
 491
 492         AC_MSG_RESULT([$kernsrcver])
 493
 494         AS_VERSION_COMPARE([$kernsrcver], [$ZFS_META_KVER_MIN], [
 495                  AC_MSG_ERROR([
 496         *** Cannot build against kernel version $kernsrcver.
 497         *** The minimum supported kernel version is $ZFS_META_KVER_MIN.
 498                 ])
 499         ])
 500
 501         LINUX=${kernelsrc}
 502         LINUX_OBJ=${kernelbuild}
 503         LINUX_VERSION=${kernsrcver}
 504
 505         AC_SUBST(LINUX)
 506         AC_SUBST(LINUX_OBJ)
 507         AC_SUBST(LINUX_VERSION)
 508 ])
 509
 510 dnl #
 511 dnl # Detect the QAT module to be built against, QAT provides hardware
 512 dnl # acceleration for data compression:
 513 dnl #
 514 dnl # https://01.org/intel-quickassist-technology
 515 dnl #
 516 dnl # 1) Download and install QAT driver from the above link
 517 dnl # 2) Start QAT driver in your system:
 518 dnl #    service qat_service start
 519 dnl # 3) Enable QAT in ZFS, e.g.:
 520 dnl #    ./configure --with-qat=<qat-driver-path>/QAT1.6
 521 dnl #    make
 522 dnl # 4) Set GZIP compression in ZFS dataset:
 523 dnl #    zfs set compression = gzip <dataset>
 524 dnl #
 525 dnl # Then the data written to this ZFS pool is compressed by QAT accelerator
 526 dnl # automatically, and de-compressed by QAT when read from the pool.
 527 dnl #
 528 dnl # 1) Get QAT hardware statistics with:
 529 dnl #    cat /proc/icp_dh895xcc_dev/qat
 530 dnl # 2) To disable QAT:
 531 dnl #    insmod zfs.ko zfs_qat_disable=1
 532 dnl #
 533 AC_DEFUN([ZFS_AC_QAT], [
 534         AC_ARG_WITH([qat],
 535                 AS_HELP_STRING([--with-qat=PATH],
 536                 [Path to qat source]),
 537                 AS_IF([test "$withval" = "yes"],
 538                         AC_MSG_ERROR([--with-qat=PATH requires a PATH]),
 539                         [qatsrc="$withval"]))
 540
 541         AC_ARG_WITH([qat-obj],
 542                 AS_HELP_STRING([--with-qat-obj=PATH],
 543                 [Path to qat build objects]),
 544                 [qatbuild="$withval"])
 545
 546         AS_IF([test ! -z "${qatsrc}"], [
 547                 AC_MSG_CHECKING([qat source directory])
 548                 AC_MSG_RESULT([$qatsrc])
 549                 QAT_SRC="${qatsrc}/quickassist"
 550                 AS_IF([ test ! -e "$QAT_SRC/include/cpa.h"], [
 551                         AC_MSG_ERROR([
 552         *** Please make sure the qat driver package is installed
 553         *** and specify the location of the qat source with the
 554         *** '--with-qat=PATH' option then try again. Failed to
 555         *** find cpa.h in:
 556         ${QAT_SRC}/include])
 557                 ])
 558         ])
 559
 560         AS_IF([test ! -z "${qatsrc}"], [
 561                 AC_MSG_CHECKING([qat build directory])
 562                 AS_IF([test -z "$qatbuild"], [
 563                         qatbuild="${qatsrc}/build"
 564                 ])
 565
 566                 AC_MSG_RESULT([$qatbuild])
 567                 QAT_OBJ=${qatbuild}
 568                 AS_IF([ ! test -e "$QAT_OBJ/icp_qa_al.ko" && ! test -e "$QAT_OBJ/qat_api.ko"], [
 569                         AC_MSG_ERROR([
 570         *** Please make sure the qat driver is installed then try again.
 571         *** Failed to find icp_qa_al.ko or qat_api.ko in:
 572         $QAT_OBJ])
 573                 ])
 574
 575                 AC_SUBST(QAT_SRC)
 576                 AC_SUBST(QAT_OBJ)
 577
 578                 AC_DEFINE(HAVE_QAT, 1,
 579                 [qat is enabled and existed])
 580         ])
 581
 582         dnl #
 583         dnl # Detect the name used for the QAT Module.symvers file.
 584         dnl #
 585         AS_IF([test ! -z "${qatsrc}"], [
 586                 AC_MSG_CHECKING([qat file for module symbols])
 587                 QAT_SYMBOLS=$QAT_SRC/lookaside/access_layer/src/Module.symvers
 588
 589                 AS_IF([test -r $QAT_SYMBOLS], [
 590                         AC_MSG_RESULT([$QAT_SYMBOLS])
 591                         AC_SUBST(QAT_SYMBOLS)
 592                 ],[
 593                         AC_MSG_ERROR([
 594         *** Please make sure the qat driver is installed then try again.
 595         *** Failed to find Module.symvers in:
 596         $QAT_SYMBOLS
 597                         ])
 598                 ])
 599         ])
 600 ])
 601
 602 dnl #
 603 dnl # ZFS_LINUX_CONFTEST_H
 604 dnl #
 605 AC_DEFUN([ZFS_LINUX_CONFTEST_H], [
 606 test -d build/$2 || mkdir -p build/$2
 607 cat - <<_ACEOF >build/$2/$2.h
 608 $1
 609 _ACEOF
 610 ])
 611
 612 dnl #
 613 dnl # ZFS_LINUX_CONFTEST_C
 614 dnl #
 615 AC_DEFUN([ZFS_LINUX_CONFTEST_C], [
 616 test -d build/$2 || mkdir -p build/$2
 617 cat confdefs.h - <<_ACEOF >build/$2/$2.c
 618 $1
 619 _ACEOF
 620 ])
 621
 622 dnl #
 623 dnl # ZFS_LINUX_CONFTEST_MAKEFILE
 624 dnl #
 625 dnl # $1 - test case name
 626 dnl # $2 - add to top-level Makefile
 627 dnl # $3 - additional build flags
 628 dnl #
 629 AC_DEFUN([ZFS_LINUX_CONFTEST_MAKEFILE], [
 630         test -d build || mkdir -p build
 631         test -d build/$1 || mkdir -p build/$1
 632
 633         file=build/$1/Makefile
 634
 635         dnl # Example command line to manually build source.
 636         cat - <<_ACEOF >$file
 637 # Example command line to manually build source
 638 # make modules -C $LINUX_OBJ $ARCH_UM M=$PWD/build/$1
 639
 640 ccflags-y := -Werror $FRAME_LARGER_THAN
 641 _ACEOF
 642
 643         dnl # Additional custom CFLAGS as requested.
 644         m4_ifval($3, [echo "ccflags-y += $3" >>$file], [])
 645
 646         dnl # Test case source
 647         echo "obj-m := $1.o" >>$file
 648
 649         AS_IF([test "x$2" = "xyes"], [echo "obj-m += $1/" >>build/Makefile], [])
 650 ])
 651
 652 dnl #
 653 dnl # ZFS_LINUX_TEST_PROGRAM(C)([PROLOGUE], [BODY])
 654 dnl #
 655 m4_define([ZFS_LINUX_TEST_PROGRAM], [
 656 #include <linux/module.h>
 657 $1
 658
 659 int
 660 main (void)
 661 {
 662 $2
 663         ;
 664         return 0;
 665 }
 666
 667 MODULE_DESCRIPTION("conftest");
 668 MODULE_AUTHOR(ZFS_META_AUTHOR);
 669 MODULE_VERSION(ZFS_META_VERSION "-" ZFS_META_RELEASE);
 670 MODULE_LICENSE($3);
 671 ])
 672
 673 dnl #
 674 dnl # ZFS_LINUX_TEST_REMOVE
 675 dnl #
 676 dnl # Removes the specified test source and results.
 677 dnl #
 678 AC_DEFUN([ZFS_LINUX_TEST_REMOVE], [
 679         test -d build/$1 && rm -Rf build/$1
 680         test -f build/Makefile && sed '/$1/d' build/Makefile
 681 ])
 682
 683 dnl #
 684 dnl # ZFS_LINUX_COMPILE
 685 dnl #
 686 dnl # $1 - build dir
 687 dnl # $2 - test command
 688 dnl # $3 - pass command
 689 dnl # $4 - fail command
 690 dnl # $5 - set KBUILD_MODPOST_NOFINAL='yes'
 691 dnl # $6 - set KBUILD_MODPOST_WARN='yes'
 692 dnl #
 693 dnl # Used internally by ZFS_LINUX_TEST_{COMPILE,MODPOST}
 694 dnl #
 695 AC_DEFUN([ZFS_LINUX_COMPILE], [
 696         AC_ARG_VAR([KERNEL_CC], [C compiler for
 697                 building kernel modules])
 698         AC_ARG_VAR([KERNEL_LD], [Linker for
 699                 building kernel modules])
 700         AC_ARG_VAR([KERNEL_LLVM], [Binary option to
 701                 build kernel modules with LLVM/CLANG toolchain])
 702         AC_TRY_COMMAND([
 703             KBUILD_MODPOST_NOFINAL="$5" KBUILD_MODPOST_WARN="$6"
 704             make modules -k -j$TEST_JOBS ${KERNEL_CC:+CC=$KERNEL_CC}
 705             ${KERNEL_LD:+LD=$KERNEL_LD} ${KERNEL_LLVM:+LLVM=$KERNEL_LLVM}
 706             CONFIG_MODULES=y CFLAGS_MODULE=-DCONFIG_MODULES
 707             -C $LINUX_OBJ $ARCH_UM M=$PWD/$1 >$1/build.log 2>&1])
 708         AS_IF([AC_TRY_COMMAND([$2])], [$3], [$4])
 709 ])
 710
 711 dnl #
 712 dnl # ZFS_LINUX_TEST_COMPILE
 713 dnl #
 714 dnl # Perform a full compile excluding the final modpost phase.
 715 dnl #
 716 AC_DEFUN([ZFS_LINUX_TEST_COMPILE], [
 717         ZFS_LINUX_COMPILE([$2], [test -f $2/build.log], [
 718                 mv $2/Makefile $2/Makefile.compile.$1
 719                 mv $2/build.log $2/build.log.$1
 720         ],[
 721                 AC_MSG_ERROR([
 722         *** Unable to compile test source to determine kernel interfaces.])
 723         ], [yes], [])
 724 ])
 725
 726 dnl #
 727 dnl # ZFS_LINUX_TEST_MODPOST
 728 dnl #
 729 dnl # Perform a full compile including the modpost phase.  This may
 730 dnl # be an incremental build if the objects have already been built.
 731 dnl #
 732 AC_DEFUN([ZFS_LINUX_TEST_MODPOST], [
 733         ZFS_LINUX_COMPILE([$2], [test -f $2/build.log], [
 734                 mv $2/Makefile $2/Makefile.modpost.$1
 735                 cat $2/build.log >>build/build.log.$1
 736         ],[
 737                 AC_MSG_ERROR([
 738         *** Unable to modpost test source to determine kernel interfaces.])
 739         ], [], [yes])
 740 ])
 741
 742 dnl #
 743 dnl # Perform the compilation of the test cases in two phases.
 744 dnl #
 745 dnl # Phase 1) attempt to build the object files for all of the tests
 746 dnl #          defined by the ZFS_LINUX_TEST_SRC macro.  But do not
 747 dnl #          perform the final modpost stage.
 748 dnl #
 749 dnl # Phase 2) disable all tests which failed the initial compilation,
 750 dnl #          then invoke the final modpost step for the remaining tests.
 751 dnl #
 752 dnl # This allows us efficiently build the test cases in parallel while
 753 dnl # remaining resilient to build failures which are expected when
 754 dnl # detecting the available kernel interfaces.
 755 dnl #
 756 dnl # The maximum allowed parallelism can be controlled by setting the
 757 dnl # TEST_JOBS environment variable.  Otherwise, it default to $(nproc).
 758 dnl #
 759 AC_DEFUN([ZFS_LINUX_TEST_COMPILE_ALL], [
 760         dnl # Phase 1 - Compilation only, final linking is skipped.
 761         ZFS_LINUX_TEST_COMPILE([$1], [build])
 762
 763         dnl #
 764         dnl # Phase 2 - When building external modules disable test cases
 765         dnl # which failed to compile and invoke modpost to verify the
 766         dnl # final linking.
 767         dnl #
 768         dnl # Test names suffixed with '_license' call modpost independently
 769         dnl # to ensure that a single incompatibility does not result in the
 770         dnl # modpost phase exiting early.  This check is not performed on
 771         dnl # every symbol since the majority are compatible and doing so
 772         dnl # would significantly slow down this phase.
 773         dnl #
 774         dnl # When configuring for builtin (--enable-linux-builtin)
 775         dnl # fake the linking step artificially create the expected .ko
 776         dnl # files for tests which did compile.  This is required for
 777         dnl # kernels which do not have loadable module support or have
 778         dnl # not yet been built.
 779         dnl #
 780         AS_IF([test "x$enable_linux_builtin" = "xno"], [
 781                 for dir in $(awk '/^obj-m/ { print [$]3 }' \
 782                     build/Makefile.compile.$1); do
 783                         name=${dir%/}
 784                         AS_IF([test -f build/$name/$name.o], [
 785                                 AS_IF([test "${name##*_}" = "license"], [
 786                                         ZFS_LINUX_TEST_MODPOST([$1],
 787                                             [build/$name])
 788                                         echo "obj-n += $dir" >>build/Makefile
 789                                 ], [
 790                                         echo "obj-m += $dir" >>build/Makefile
 791                                 ])
 792                         ], [
 793                                 echo "obj-n += $dir" >>build/Makefile
 794                         ])
 795                 done
 796
 797                 ZFS_LINUX_TEST_MODPOST([$1], [build])
 798         ], [
 799                 for dir in $(awk '/^obj-m/ { print [$]3 }' \
 800                     build/Makefile.compile.$1); do
 801                         name=${dir%/}
 802                         AS_IF([test -f build/$name/$name.o], [
 803                                 touch build/$name/$name.ko
 804                         ])
 805                 done
 806         ])
 807 ])
 808
 809 dnl #
 810 dnl # ZFS_LINUX_TEST_SRC
 811 dnl #
 812 dnl # $1 - name
 813 dnl # $2 - global
 814 dnl # $3 - source
 815 dnl # $4 - extra cflags
 816 dnl # $5 - check license-compatibility
 817 dnl #
 818 dnl # Check if the test source is buildable at all and then if it is
 819 dnl # license compatible.
 820 dnl #
 821 dnl # N.B because all of the test cases are compiled in parallel they
 822 dnl # must never depend on the results of previous tests.  Each test
 823 dnl # needs to be entirely independent.
 824 dnl #
 825 AC_DEFUN([ZFS_LINUX_TEST_SRC], [
 826         ZFS_LINUX_CONFTEST_C([ZFS_LINUX_TEST_PROGRAM([[$2]], [[$3]],
 827             [["Dual BSD/GPL"]])], [$1])
 828         ZFS_LINUX_CONFTEST_MAKEFILE([$1], [yes], [$4])
 829
 830         AS_IF([ test -n "$5" ], [
 831                 ZFS_LINUX_CONFTEST_C([ZFS_LINUX_TEST_PROGRAM(
 832                     [[$2]], [[$3]], [[$5]])], [$1_license])
 833                 ZFS_LINUX_CONFTEST_MAKEFILE([$1_license], [yes], [$4])
 834         ])
 835 ])
 836
 837 dnl #
 838 dnl # ZFS_LINUX_TEST_RESULT
 839 dnl #
 840 dnl # $1 - name of a test source (ZFS_LINUX_TEST_SRC)
 841 dnl # $2 - run on success (valid .ko generated)
 842 dnl # $3 - run on failure (unable to compile)
 843 dnl #
 844 AC_DEFUN([ZFS_LINUX_TEST_RESULT], [
 845         AS_IF([test -d build/$1], [
 846                 AS_IF([test -f build/$1/$1.ko], [$2], [$3])
 847         ], [
 848                 AC_MSG_ERROR([
 849         *** No matching source for the "$1" test, check that
 850         *** both the test source and result macros refer to the same name.
 851                 ])
 852         ])
 853 ])
 854
 855 dnl #
 856 dnl # ZFS_LINUX_TEST_ERROR
 857 dnl #
 858 dnl # Generic error message which can be used when none of the expected
 859 dnl # kernel interfaces were detected.
 860 dnl #
 861 AC_DEFUN([ZFS_LINUX_TEST_ERROR], [
 862         AC_MSG_ERROR([
 863         *** None of the expected "$1" interfaces were detected.
 864         *** This may be because your kernel version is newer than what is
 865         *** supported, or you are using a patched custom kernel with
 866         *** incompatible modifications.
 867         ***
 868         *** ZFS Version: $ZFS_META_ALIAS
 869         *** Compatible Kernels: $ZFS_META_KVER_MIN - $ZFS_META_KVER_MAX
 870         ])
 871 ])
 872
 873 dnl #
 874 dnl # ZFS_LINUX_TEST_RESULT_SYMBOL
 875 dnl #
 876 dnl # Like ZFS_LINUX_TEST_RESULT except ZFS_CHECK_SYMBOL_EXPORT is called to
 877 dnl # verify symbol exports, unless --enable-linux-builtin was provided to
 878 dnl # configure.
 879 dnl #
 880 AC_DEFUN([ZFS_LINUX_TEST_RESULT_SYMBOL], [
 881         AS_IF([ ! test -f build/$1/$1.ko], [
 882                 $5
 883         ], [
 884                 AS_IF([test "x$enable_linux_builtin" != "xyes"], [
 885                         ZFS_CHECK_SYMBOL_EXPORT([$2], [$3], [$4], [$5])
 886                 ], [
 887                         $4
 888                 ])
 889         ])
 890 ])
 891
 892 dnl #
 893 dnl # ZFS_LINUX_COMPILE_IFELSE
 894 dnl #
 895 AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
 896         ZFS_LINUX_TEST_REMOVE([conftest])
 897
 898         m4_ifvaln([$1], [ZFS_LINUX_CONFTEST_C([$1], [conftest])])
 899         m4_ifvaln([$5], [ZFS_LINUX_CONFTEST_H([$5], [conftest])],
 900             [ZFS_LINUX_CONFTEST_H([], [conftest])])
 901
 902         ZFS_LINUX_CONFTEST_MAKEFILE([conftest], [no],
 903             [m4_ifvaln([$5], [-I$PWD/build/conftest], [])])
 904         ZFS_LINUX_COMPILE([build/conftest], [$2], [$3], [$4], [], [])
 905 ])
 906
 907 dnl #
 908 dnl # ZFS_LINUX_TRY_COMPILE
 909 dnl #
 910 dnl # $1 - global
 911 dnl # $2 - source
 912 dnl # $3 - run on success (valid .ko generated)
 913 dnl # $4 - run on failure (unable to compile)
 914 dnl #
 915 dnl # When configuring as builtin (--enable-linux-builtin) for kernels
 916 dnl # without loadable module support (CONFIG_MODULES=n) only the object
 917 dnl # file is created.  See ZFS_LINUX_TEST_COMPILE_ALL for details.
 918 dnl #
 919 AC_DEFUN([ZFS_LINUX_TRY_COMPILE], [
 920         AS_IF([test "x$enable_linux_builtin" = "xyes"], [
 921                 ZFS_LINUX_COMPILE_IFELSE(
 922                     [ZFS_LINUX_TEST_PROGRAM([[$1]], [[$2]],
 923                     [[ZFS_META_LICENSE]])],
 924                     [test -f build/conftest/conftest.o], [$3], [$4])
 925         ], [
 926                 ZFS_LINUX_COMPILE_IFELSE(
 927                     [ZFS_LINUX_TEST_PROGRAM([[$1]], [[$2]],
 928                     [[ZFS_META_LICENSE]])],
 929                     [test -f build/conftest/conftest.ko], [$3], [$4])
 930         ])
 931 ])
 932
 933 dnl #
 934 dnl # ZFS_CHECK_SYMBOL_EXPORT
 935 dnl #
 936 dnl # Check if a symbol is exported on not by consulting the symbols
 937 dnl # file, or optionally the source code.
 938 dnl #
 939 AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT], [
 940         grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
 941                 $LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
 942         rc=$?
 943         if test $rc -ne 0; then
 944                 export=0
 945                 for file in $2; do
 946                         grep -q -E "EXPORT_SYMBOL.*($1)" \
 947                                 "$LINUX/$file" 2>/dev/null
 948                         rc=$?
 949                         if test $rc -eq 0; then
 950                                 export=1
 951                                 break;
 952                         fi
 953                 done
 954                 if test $export -eq 0; then :
 955                         $4
 956                 else :
 957                         $3
 958                 fi
 959         else :
 960                 $3
 961         fi
 962 ])
 963
 964 dnl #
 965 dnl # ZFS_LINUX_TRY_COMPILE_SYMBOL
 966 dnl #
 967 dnl # Like ZFS_LINUX_TRY_COMPILER except ZFS_CHECK_SYMBOL_EXPORT is called
 968 dnl # to verify symbol exports, unless --enable-linux-builtin was provided
 969 dnl # to configure.
 970 dnl #
 971 AC_DEFUN([ZFS_LINUX_TRY_COMPILE_SYMBOL], [
 972         ZFS_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
 973         if test $rc -ne 0; then :
 974                 $6
 975         else
 976                 if test "x$enable_linux_builtin" != xyes; then
 977                         ZFS_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
 978                 fi
 979                 if test $rc -ne 0; then :
 980                         $6
 981                 else :
 982                         $5
 983                 fi
 984         fi
 985 ])
 986
 987 dnl #
 988 dnl # ZFS_LINUX_TRY_COMPILE_HEADER
 989 dnl # like ZFS_LINUX_TRY_COMPILE, except the contents conftest.h are
 990 dnl # provided via the fifth parameter
 991 dnl #
 992 AC_DEFUN([ZFS_LINUX_TRY_COMPILE_HEADER], [
 993         AS_IF([test "x$enable_linux_builtin" = "xyes"], [
 994                 ZFS_LINUX_COMPILE_IFELSE(
 995                     [ZFS_LINUX_TEST_PROGRAM([[$1]], [[$2]],
 996                     [[ZFS_META_LICENSE]])],
 997                     [test -f build/conftest/conftest.o], [$3], [$4], [$5])
 998         ], [
 999                 ZFS_LINUX_COMPILE_IFELSE(
1000                     [ZFS_LINUX_TEST_PROGRAM([[$1]], [[$2]],
1001                     [[ZFS_META_LICENSE]])],
1002                     [test -f build/conftest/conftest.ko], [$3], [$4], [$5])
1003         ])
1004 ])
1005
1006 dnl #
1007 dnl # AS_VERSION_COMPARE_LE
1008 dnl # like AS_VERSION_COMPARE_LE, but runs $3 if (and only if) $1 <= $2
1009 dnl # AS_VERSION_COMPARE_LE (version-1, version-2, [action-if-less-or-equal], [action-if-greater])
1010 dnl #
1011 AC_DEFUN([AS_VERSION_COMPARE_LE], [
1012         AS_VERSION_COMPARE([$1], [$2], [$3], [$3], [$4])
1013 ])
1014
1015 dnl #
1016 dnl # ZFS_LINUX_REQUIRE_API
1017 dnl # like ZFS_LINUX_TEST_ERROR, except only fails if the kernel is
1018 dnl # at least some specified version.
1019 dnl #
1020 AC_DEFUN([ZFS_LINUX_REQUIRE_API], [
1021         AS_VERSION_COMPARE_LE([$2], [$kernsrcver], [
1022                 AC_MSG_ERROR([
1023                 *** None of the expected "$1" interfaces were detected. This
1024                 *** interface is expected for kernels version "$2" and above.
1025                 *** This may be because your kernel version is newer than what is
1026                 *** supported, or you are using a patched custom kernel with
1027                 *** incompatible modifications.  Newer kernels may have incompatible
1028                 *** APIs.
1029                 ***
1030                 *** ZFS Version: $ZFS_META_ALIAS
1031                 *** Compatible Kernels: $ZFS_META_KVER_MIN - $ZFS_META_KVER_MAX
1032                 ])
1033         ], [
1034                 AC_MSG_RESULT(no)
1035         ])
1036 ])