| blob | df194ec72207351821dc2e72b8f9b14458e760a4 |
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
10 dnl # Sanity checks for module building and CONFIG_* defines
11 ZFS_AC_KERNEL_CONFIG_DEFINED
12 ZFS_AC_MODULE_SYMVERS
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
21 dnl # Parallel ZFS_LINUX_TEST_SRC / ZFS_LINUX_TEST_RESULT tests
22 ZFS_AC_KERNEL_TEST_SRC
23 ZFS_AC_KERNEL_TEST_RESULT
25 AS_IF([test "$LINUX_OBJ" != "$LINUX"], [
26 KERNEL_MAKE="$KERNEL_MAKE O=$LINUX_OBJ"
27 ])
29 AC_SUBST(KERNEL_MAKE)
30 ])
31 ])
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 case "$host_cpu" in
166 powerpc*)
167 ZFS_AC_KERNEL_SRC_CPU_HAS_FEATURE
168 ZFS_AC_KERNEL_SRC_FLUSH_DCACHE_PAGE
169 ;;
170 esac
172 AC_MSG_CHECKING([for available kernel interfaces])
173 ZFS_LINUX_TEST_COMPILE_ALL([kabi])
174 AC_MSG_RESULT([done])
175 ])
177 dnl #
178 dnl # Check results of kernel interface tests.
179 dnl #
180 AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
181 ZFS_AC_KERNEL_ACCESS_OK_TYPE
182 ZFS_AC_KERNEL_GLOBAL_PAGE_STATE
183 ZFS_AC_KERNEL_OBJTOOL
184 ZFS_AC_KERNEL_PDE_DATA
185 ZFS_AC_KERNEL_FALLOCATE
186 ZFS_AC_KERNEL_FADVISE
187 ZFS_AC_KERNEL_GENERIC_FADVISE
188 ZFS_AC_KERNEL_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
189 ZFS_AC_KERNEL_RWSEM
190 ZFS_AC_KERNEL_SCHED
191 ZFS_AC_KERNEL_USLEEP_RANGE
192 ZFS_AC_KERNEL_KMEM_CACHE
193 ZFS_AC_KERNEL_KVMALLOC
194 ZFS_AC_KERNEL_VMALLOC_PAGE_KERNEL
195 ZFS_AC_KERNEL_WAIT
196 ZFS_AC_KERNEL_INODE_TIMES
197 ZFS_AC_KERNEL_INODE_LOCK
198 ZFS_AC_KERNEL_GROUP_INFO_GID
199 ZFS_AC_KERNEL_RW
200 ZFS_AC_KERNEL_TIMER_SETUP
201 ZFS_AC_KERNEL_SUPER_USER_NS
202 ZFS_AC_KERNEL_PROC_OPERATIONS
203 ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS
204 ZFS_AC_KERNEL_BIO
205 ZFS_AC_KERNEL_BLKDEV
206 ZFS_AC_KERNEL_BLK_QUEUE
207 ZFS_AC_KERNEL_GENHD_FLAGS
208 ZFS_AC_KERNEL_REVALIDATE_DISK
209 ZFS_AC_KERNEL_GET_DISK_RO
210 ZFS_AC_KERNEL_GENERIC_READLINK_GLOBAL
211 ZFS_AC_KERNEL_DISCARD_GRANULARITY
212 ZFS_AC_KERNEL_INODE_OWNER_OR_CAPABLE
213 ZFS_AC_KERNEL_XATTR
214 ZFS_AC_KERNEL_ACL
215 ZFS_AC_KERNEL_INODE_SETATTR
216 ZFS_AC_KERNEL_INODE_GETATTR
217 ZFS_AC_KERNEL_INODE_SET_FLAGS
218 ZFS_AC_KERNEL_INODE_SET_IVERSION
219 ZFS_AC_KERNEL_SHOW_OPTIONS
220 ZFS_AC_KERNEL_FILE_INODE
221 ZFS_AC_KERNEL_FILE_DENTRY
222 ZFS_AC_KERNEL_FSYNC
223 ZFS_AC_KERNEL_AIO_FSYNC
224 ZFS_AC_KERNEL_EVICT_INODE
225 ZFS_AC_KERNEL_DIRTY_INODE
226 ZFS_AC_KERNEL_SHRINKER
227 ZFS_AC_KERNEL_MKDIR
228 ZFS_AC_KERNEL_LOOKUP_FLAGS
229 ZFS_AC_KERNEL_CREATE
230 ZFS_AC_KERNEL_PERMISSION
231 ZFS_AC_KERNEL_GET_LINK
232 ZFS_AC_KERNEL_PUT_LINK
233 ZFS_AC_KERNEL_TMPFILE
234 ZFS_AC_KERNEL_AUTOMOUNT
235 ZFS_AC_KERNEL_ENCODE_FH_WITH_INODE
236 ZFS_AC_KERNEL_COMMIT_METADATA
237 ZFS_AC_KERNEL_CLEAR_INODE
238 ZFS_AC_KERNEL_SETATTR_PREPARE
239 ZFS_AC_KERNEL_INSERT_INODE_LOCKED
240 ZFS_AC_KERNEL_DENTRY
241 ZFS_AC_KERNEL_DENTRY_ALIAS_D_U
242 ZFS_AC_KERNEL_TRUNCATE_SETSIZE
243 ZFS_AC_KERNEL_SECURITY_INODE
244 ZFS_AC_KERNEL_FST_MOUNT
245 ZFS_AC_KERNEL_BDI
246 ZFS_AC_KERNEL_SET_NLINK
247 ZFS_AC_KERNEL_SGET
248 ZFS_AC_KERNEL_LSEEK_EXECUTE
249 ZFS_AC_KERNEL_VFS_FILEMAP_DIRTY_FOLIO
250 ZFS_AC_KERNEL_VFS_READ_FOLIO
251 ZFS_AC_KERNEL_VFS_GETATTR
252 ZFS_AC_KERNEL_VFS_FSYNC_2ARGS
253 ZFS_AC_KERNEL_VFS_ITERATE
254 ZFS_AC_KERNEL_VFS_DIRECT_IO
255 ZFS_AC_KERNEL_VFS_READPAGES
256 ZFS_AC_KERNEL_VFS_SET_PAGE_DIRTY_NOBUFFERS
257 ZFS_AC_KERNEL_VFS_RW_ITERATE
258 ZFS_AC_KERNEL_VFS_GENERIC_WRITE_CHECKS
259 ZFS_AC_KERNEL_VFS_IOV_ITER
260 ZFS_AC_KERNEL_VFS_COPY_FILE_RANGE
261 ZFS_AC_KERNEL_VFS_GENERIC_COPY_FILE_RANGE
262 ZFS_AC_KERNEL_VFS_REMAP_FILE_RANGE
263 ZFS_AC_KERNEL_VFS_CLONE_FILE_RANGE
264 ZFS_AC_KERNEL_VFS_DEDUPE_FILE_RANGE
265 ZFS_AC_KERNEL_VFS_FILE_OPERATIONS_EXTEND
266 ZFS_AC_KERNEL_KMAP_ATOMIC_ARGS
267 ZFS_AC_KERNEL_FOLLOW_DOWN_ONE
268 ZFS_AC_KERNEL_MAKE_REQUEST_FN
269 ZFS_AC_KERNEL_GENERIC_IO_ACCT
270 ZFS_AC_KERNEL_FPU
271 ZFS_AC_KERNEL_FMODE_T
272 ZFS_AC_KERNEL_KUIDGID_T
273 ZFS_AC_KERNEL_KUID_HELPERS
274 ZFS_AC_KERNEL_RENAME
275 ZFS_AC_KERNEL_CURRENT_TIME
276 ZFS_AC_KERNEL_USERNS_CAPABILITIES
277 ZFS_AC_KERNEL_IN_COMPAT_SYSCALL
278 ZFS_AC_KERNEL_KTIME
279 ZFS_AC_KERNEL_TOTALRAM_PAGES_FUNC
280 ZFS_AC_KERNEL_TOTALHIGH_PAGES
281 ZFS_AC_KERNEL_KSTRTOUL
282 ZFS_AC_KERNEL_PERCPU
283 ZFS_AC_KERNEL_CPU_HOTPLUG
284 ZFS_AC_KERNEL_GENERIC_FILLATTR
285 ZFS_AC_KERNEL_MKNOD
286 ZFS_AC_KERNEL_SYMLINK
287 ZFS_AC_KERNEL_BIO_MAX_SEGS
288 ZFS_AC_KERNEL_SIGNAL_STOP
289 ZFS_AC_KERNEL_SIGINFO
290 ZFS_AC_KERNEL_SYSFS
291 ZFS_AC_KERNEL_SET_SPECIAL_STATE
292 ZFS_AC_KERNEL_STANDALONE_LINUX_STDARG
293 ZFS_AC_KERNEL_PAGEMAP_FOLIO_WAIT_BIT
294 ZFS_AC_KERNEL_ADD_DISK
295 ZFS_AC_KERNEL_KTHREAD
296 ZFS_AC_KERNEL_ZERO_PAGE
297 ZFS_AC_KERNEL___COPY_FROM_USER_INATOMIC
298 ZFS_AC_KERNEL_USER_NS_COMMON_INUM
299 ZFS_AC_KERNEL_IDMAP_MNT_API
300 ZFS_AC_KERNEL_IATTR_VFSID
301 ZFS_AC_KERNEL_FILEMAP
302 ZFS_AC_KERNEL_WRITEPAGE_T
303 ZFS_AC_KERNEL_RECLAIMED
304 ZFS_AC_KERNEL_REGISTER_SYSCTL_TABLE
305 ZFS_AC_KERNEL_COPY_SPLICE_READ
306 case "$host_cpu" in
307 powerpc*)
308 ZFS_AC_KERNEL_CPU_HAS_FEATURE
309 ZFS_AC_KERNEL_FLUSH_DCACHE_PAGE
310 ;;
311 esac
312 ])
314 dnl #
315 dnl # Detect name used for Module.symvers file in kernel
316 dnl #
317 AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
318 modpost=$LINUX/scripts/Makefile.modpost
319 AC_MSG_CHECKING([kernel file name for module symbols])
320 AS_IF([test "x$enable_linux_builtin" != xyes -a -f "$modpost"], [
321 AS_IF([grep -q Modules.symvers $modpost], [
322 LINUX_SYMBOLS=Modules.symvers
323 ], [
324 LINUX_SYMBOLS=Module.symvers
325 ])
327 AS_IF([test ! -f "$LINUX_OBJ/$LINUX_SYMBOLS"], [
328 AC_MSG_ERROR([
329 *** Please make sure the kernel devel package for your distribution
330 *** is installed. If you are building with a custom kernel, make sure
331 *** the kernel is configured, built, and the '--with-linux=PATH'
332 *** configure option refers to the location of the kernel source.
333 ])
334 ])
335 ], [
336 LINUX_SYMBOLS=NONE
337 ])
338 AC_MSG_RESULT($LINUX_SYMBOLS)
339 AC_SUBST(LINUX_SYMBOLS)
340 ])
342 dnl #
343 dnl # Detect the kernel to be built against
344 dnl #
345 dnl # Most modern Linux distributions have separate locations for bare
346 dnl # source (source) and prebuilt (build) files. Additionally, there are
347 dnl # `source` and `build` symlinks in `/lib/modules/$(KERNEL_VERSION)`
348 dnl # pointing to them. The directory search order is now:
349 dnl #
350 dnl # - `configure` command line values if both `--with-linux` and
351 dnl # `--with-linux-obj` were defined
352 dnl #
353 dnl # - If only `--with-linux` was defined, `--with-linux-obj` is assumed
354 dnl # to have the same value as `--with-linux`
355 dnl #
356 dnl # - If neither `--with-linux` nor `--with-linux-obj` were defined
357 dnl # autodetection is used:
358 dnl #
359 dnl # - `/lib/modules/$(uname -r)/{source,build}` respectively, if exist.
360 dnl #
361 dnl # - If only `/lib/modules/$(uname -r)/build` exists, it is assumed
362 dnl # to be both source and build directory.
363 dnl #
364 dnl # - The first directory in `/lib/modules` with the highest version
365 dnl # number according to `sort -V` which contains both `source` and
366 dnl # `build` symlinks/directories. If module directory contains only
367 dnl # `build` component, it is assumed to be both source and build
368 dnl # directory.
369 dnl #
370 dnl # - Last resort: the first directory matching `/usr/src/kernels/*`
371 dnl # and `/usr/src/linux-*` with the highest version number according
372 dnl # to `sort -V` is assumed to be both source and build directory.
373 dnl #
374 AC_DEFUN([ZFS_AC_KERNEL], [
375 AC_ARG_WITH([linux],
376 AS_HELP_STRING([--with-linux=PATH],
377 [Path to kernel source]),
378 [kernelsrc="$withval"])
380 AC_ARG_WITH(linux-obj,
381 AS_HELP_STRING([--with-linux-obj=PATH],
382 [Path to kernel build objects]),
383 [kernelbuild="$withval"])
385 AC_MSG_CHECKING([kernel source and build directories])
386 AS_IF([test -n "$kernelsrc" && test -z "$kernelbuild"], [
387 kernelbuild="$kernelsrc"
388 ], [test -z "$kernelsrc"], [
389 AS_IF([test -e "/lib/modules/$(uname -r)/source" && \
390 test -e "/lib/modules/$(uname -r)/build"], [
391 src="/lib/modules/$(uname -r)/source"
392 build="/lib/modules/$(uname -r)/build"
393 ], [test -e "/lib/modules/$(uname -r)/build"], [
394 build="/lib/modules/$(uname -r)/build"
395 src="$build"
396 ], [
397 src=
399 for d in $(ls -1d /lib/modules/* 2>/dev/null | sort -Vr); do
400 if test -e "$d/source" && test -e "$d/build"; then
401 src="$d/source"
402 build="$d/build"
403 break
404 fi
406 if test -e "$d/build"; then
407 src="$d/build"
408 build="$d/build"
409 break
410 fi
411 done
413 # the least reliable method
414 if test -z "$src"; then
415 src=$(ls -1d /usr/src/kernels/* /usr/src/linux-* \
416 2>/dev/null | grep -v obj | sort -Vr | head -1)
417 build="$src"
418 fi
419 ])
421 AS_IF([test -n "$src" && test -e "$src"], [
422 kernelsrc=$(readlink -e "$src")
423 ], [
424 kernelsrc="[Not found]"
425 ])
426 AS_IF([test -n "$build" && test -e "$build"], [
427 kernelbuild=$(readlink -e "$build")
428 ], [
429 kernelbuild="[Not found]"
430 ])
431 ], [
432 AS_IF([test "$kernelsrc" = "NONE"], [
433 kernsrcver=NONE
434 ])
435 withlinux=yes
436 ])
438 AC_MSG_RESULT([done])
439 AC_MSG_CHECKING([kernel source directory])
440 AC_MSG_RESULT([$kernelsrc])
441 AC_MSG_CHECKING([kernel build directory])
442 AC_MSG_RESULT([$kernelbuild])
443 AS_IF([test ! -d "$kernelsrc" || test ! -d "$kernelbuild"], [
444 AC_MSG_ERROR([
445 *** Please make sure the kernel devel package for your distribution
446 *** is installed and then try again. If that fails, you can specify the
447 *** location of the kernel source and build with the '--with-linux=PATH' and
448 *** '--with-linux-obj=PATH' options respectively.])
449 ])
451 AC_MSG_CHECKING([kernel source version])
452 utsrelease1=$kernelbuild/include/linux/version.h
453 utsrelease2=$kernelbuild/include/linux/utsrelease.h
454 utsrelease3=$kernelbuild/include/generated/utsrelease.h
455 AS_IF([test -r $utsrelease1 && grep -qF UTS_RELEASE $utsrelease1], [
456 utsrelease=$utsrelease1
457 ], [test -r $utsrelease2 && grep -qF UTS_RELEASE $utsrelease2], [
458 utsrelease=$utsrelease2
459 ], [test -r $utsrelease3 && grep -qF UTS_RELEASE $utsrelease3], [
460 utsrelease=$utsrelease3
461 ])
463 AS_IF([test -n "$utsrelease"], [
464 kernsrcver=$($AWK '/UTS_RELEASE/ { gsub(/"/, "", $[3]); print $[3] }' $utsrelease)
465 AS_IF([test -z "$kernsrcver"], [
466 AC_MSG_RESULT([Not found])
467 AC_MSG_ERROR([
468 *** Cannot determine kernel version.
469 ])
470 ])
471 ], [
472 AC_MSG_RESULT([Not found])
473 if test "x$enable_linux_builtin" != xyes; then
474 AC_MSG_ERROR([
475 *** Cannot find UTS_RELEASE definition.
476 ])
477 else
478 AC_MSG_ERROR([
479 *** Cannot find UTS_RELEASE definition.
480 *** Please run 'make prepare' inside the kernel source tree.])
481 fi
482 ])
484 AC_MSG_RESULT([$kernsrcver])
486 AS_VERSION_COMPARE([$kernsrcver], [$ZFS_META_KVER_MIN], [
487 AC_MSG_ERROR([
488 *** Cannot build against kernel version $kernsrcver.
489 *** The minimum supported kernel version is $ZFS_META_KVER_MIN.
490 ])
491 ])
493 LINUX=${kernelsrc}
494 LINUX_OBJ=${kernelbuild}
495 LINUX_VERSION=${kernsrcver}
497 AC_SUBST(LINUX)
498 AC_SUBST(LINUX_OBJ)
499 AC_SUBST(LINUX_VERSION)
500 ])
502 dnl #
503 dnl # Detect the QAT module to be built against, QAT provides hardware
504 dnl # acceleration for data compression:
505 dnl #
506 dnl # https://01.org/intel-quickassist-technology
507 dnl #
508 dnl # 1) Download and install QAT driver from the above link
509 dnl # 2) Start QAT driver in your system:
510 dnl # service qat_service start
511 dnl # 3) Enable QAT in ZFS, e.g.:
512 dnl # ./configure --with-qat=<qat-driver-path>/QAT1.6
513 dnl # make
514 dnl # 4) Set GZIP compression in ZFS dataset:
515 dnl # zfs set compression = gzip <dataset>
516 dnl #
517 dnl # Then the data written to this ZFS pool is compressed by QAT accelerator
518 dnl # automatically, and de-compressed by QAT when read from the pool.
519 dnl #
520 dnl # 1) Get QAT hardware statistics with:
521 dnl # cat /proc/icp_dh895xcc_dev/qat
522 dnl # 2) To disable QAT:
523 dnl # insmod zfs.ko zfs_qat_disable=1
524 dnl #
525 AC_DEFUN([ZFS_AC_QAT], [
526 AC_ARG_WITH([qat],
527 AS_HELP_STRING([--with-qat=PATH],
528 [Path to qat source]),
529 AS_IF([test "$withval" = "yes"],
530 AC_MSG_ERROR([--with-qat=PATH requires a PATH]),
531 [qatsrc="$withval"]))
533 AC_ARG_WITH([qat-obj],
534 AS_HELP_STRING([--with-qat-obj=PATH],
535 [Path to qat build objects]),
536 [qatbuild="$withval"])
538 AS_IF([test ! -z "${qatsrc}"], [
539 AC_MSG_CHECKING([qat source directory])
540 AC_MSG_RESULT([$qatsrc])
541 QAT_SRC="${qatsrc}/quickassist"
542 AS_IF([ test ! -e "$QAT_SRC/include/cpa.h"], [
543 AC_MSG_ERROR([
544 *** Please make sure the qat driver package is installed
545 *** and specify the location of the qat source with the
546 *** '--with-qat=PATH' option then try again. Failed to
547 *** find cpa.h in:
548 ${QAT_SRC}/include])
549 ])
550 ])
552 AS_IF([test ! -z "${qatsrc}"], [
553 AC_MSG_CHECKING([qat build directory])
554 AS_IF([test -z "$qatbuild"], [
555 qatbuild="${qatsrc}/build"
556 ])
558 AC_MSG_RESULT([$qatbuild])
559 QAT_OBJ=${qatbuild}
560 AS_IF([ ! test -e "$QAT_OBJ/icp_qa_al.ko" && ! test -e "$QAT_OBJ/qat_api.ko"], [
561 AC_MSG_ERROR([
562 *** Please make sure the qat driver is installed then try again.
563 *** Failed to find icp_qa_al.ko or qat_api.ko in:
564 $QAT_OBJ])
565 ])
567 AC_SUBST(QAT_SRC)
568 AC_SUBST(QAT_OBJ)
570 AC_DEFINE(HAVE_QAT, 1,
571 [qat is enabled and existed])
572 ])
574 dnl #
575 dnl # Detect the name used for the QAT Module.symvers file.
576 dnl #
577 AS_IF([test ! -z "${qatsrc}"], [
578 AC_MSG_CHECKING([qat file for module symbols])
579 QAT_SYMBOLS=$QAT_SRC/lookaside/access_layer/src/Module.symvers
581 AS_IF([test -r $QAT_SYMBOLS], [
582 AC_MSG_RESULT([$QAT_SYMBOLS])
583 AC_SUBST(QAT_SYMBOLS)
584 ],[
585 AC_MSG_ERROR([
586 *** Please make sure the qat driver is installed then try again.
587 *** Failed to find Module.symvers in:
588 $QAT_SYMBOLS
589 ])
590 ])
591 ])
592 ])
594 dnl #
595 dnl # ZFS_LINUX_CONFTEST_H
596 dnl #
597 AC_DEFUN([ZFS_LINUX_CONFTEST_H], [
598 test -d build/$2 || mkdir -p build/$2
599 cat - <<_ACEOF >build/$2/$2.h
600 $1
601 _ACEOF
602 ])
604 dnl #
605 dnl # ZFS_LINUX_CONFTEST_C
606 dnl #
607 AC_DEFUN([ZFS_LINUX_CONFTEST_C], [
608 test -d build/$2 || mkdir -p build/$2
609 cat confdefs.h - <<_ACEOF >build/$2/$2.c
610 $1
611 _ACEOF
612 ])
614 dnl #
615 dnl # ZFS_LINUX_CONFTEST_MAKEFILE
616 dnl #
617 dnl # $1 - test case name
618 dnl # $2 - add to top-level Makefile
619 dnl # $3 - additional build flags
620 dnl #
621 AC_DEFUN([ZFS_LINUX_CONFTEST_MAKEFILE], [
622 test -d build || mkdir -p build
623 test -d build/$1 || mkdir -p build/$1
625 file=build/$1/Makefile
627 dnl # Example command line to manually build source.
628 cat - <<_ACEOF >$file
629 # Example command line to manually build source
630 # make modules -C $LINUX_OBJ $ARCH_UM M=$PWD/build/$1
632 ccflags-y := -Werror $FRAME_LARGER_THAN
633 _ACEOF
635 dnl # Additional custom CFLAGS as requested.
636 m4_ifval($3, [echo "ccflags-y += $3" >>$file], [])
638 dnl # Test case source
639 echo "obj-m := $1.o" >>$file
641 AS_IF([test "x$2" = "xyes"], [echo "obj-m += $1/" >>build/Makefile], [])
642 ])
644 dnl #
645 dnl # ZFS_LINUX_TEST_PROGRAM(C)([PROLOGUE], [BODY])
646 dnl #
647 m4_define([ZFS_LINUX_TEST_PROGRAM], [
648 #include <linux/module.h>
649 $1
651 int
652 main (void)
653 {
654 $2
655 ;
656 return 0;
657 }
659 MODULE_DESCRIPTION("conftest");
660 MODULE_AUTHOR(ZFS_META_AUTHOR);
661 MODULE_VERSION(ZFS_META_VERSION "-" ZFS_META_RELEASE);
662 MODULE_LICENSE($3);
663 ])
665 dnl #
666 dnl # ZFS_LINUX_TEST_REMOVE
667 dnl #
668 dnl # Removes the specified test source and results.
669 dnl #
670 AC_DEFUN([ZFS_LINUX_TEST_REMOVE], [
671 test -d build/$1 && rm -Rf build/$1
672 test -f build/Makefile && sed '/$1/d' build/Makefile
673 ])
675 dnl #
676 dnl # ZFS_LINUX_COMPILE
677 dnl #
678 dnl # $1 - build dir
679 dnl # $2 - test command
680 dnl # $3 - pass command
681 dnl # $4 - fail command
682 dnl # $5 - set KBUILD_MODPOST_NOFINAL='yes'
683 dnl # $6 - set KBUILD_MODPOST_WARN='yes'
684 dnl #
685 dnl # Used internally by ZFS_LINUX_TEST_{COMPILE,MODPOST}
686 dnl #
687 AC_DEFUN([ZFS_LINUX_COMPILE], [
688 AC_ARG_VAR([KERNEL_CC], [C compiler for
689 building kernel modules])
690 AC_ARG_VAR([KERNEL_LD], [Linker for
691 building kernel modules])
692 AC_ARG_VAR([KERNEL_LLVM], [Binary option to
693 build kernel modules with LLVM/CLANG toolchain])
694 AC_TRY_COMMAND([
695 KBUILD_MODPOST_NOFINAL="$5" KBUILD_MODPOST_WARN="$6"
696 make modules -k -j$TEST_JOBS ${KERNEL_CC:+CC=$KERNEL_CC}
697 ${KERNEL_LD:+LD=$KERNEL_LD} ${KERNEL_LLVM:+LLVM=$KERNEL_LLVM}
698 CONFIG_MODULES=y CFLAGS_MODULE=-DCONFIG_MODULES
699 -C $LINUX_OBJ $ARCH_UM M=$PWD/$1 >$1/build.log 2>&1])
700 AS_IF([AC_TRY_COMMAND([$2])], [$3], [$4])
701 ])
703 dnl #
704 dnl # ZFS_LINUX_TEST_COMPILE
705 dnl #
706 dnl # Perform a full compile excluding the final modpost phase.
707 dnl #
708 AC_DEFUN([ZFS_LINUX_TEST_COMPILE], [
709 ZFS_LINUX_COMPILE([$2], [test -f $2/build.log], [
710 mv $2/Makefile $2/Makefile.compile.$1
711 mv $2/build.log $2/build.log.$1
712 ],[
713 AC_MSG_ERROR([
714 *** Unable to compile test source to determine kernel interfaces.])
715 ], [yes], [])
716 ])
718 dnl #
719 dnl # ZFS_LINUX_TEST_MODPOST
720 dnl #
721 dnl # Perform a full compile including the modpost phase. This may
722 dnl # be an incremental build if the objects have already been built.
723 dnl #
724 AC_DEFUN([ZFS_LINUX_TEST_MODPOST], [
725 ZFS_LINUX_COMPILE([$2], [test -f $2/build.log], [
726 mv $2/Makefile $2/Makefile.modpost.$1
727 cat $2/build.log >>build/build.log.$1
728 ],[
729 AC_MSG_ERROR([
730 *** Unable to modpost test source to determine kernel interfaces.])
731 ], [], [yes])
732 ])
734 dnl #
735 dnl # Perform the compilation of the test cases in two phases.
736 dnl #
737 dnl # Phase 1) attempt to build the object files for all of the tests
738 dnl # defined by the ZFS_LINUX_TEST_SRC macro. But do not
739 dnl # perform the final modpost stage.
740 dnl #
741 dnl # Phase 2) disable all tests which failed the initial compilation,
742 dnl # then invoke the final modpost step for the remaining tests.
743 dnl #
744 dnl # This allows us efficiently build the test cases in parallel while
745 dnl # remaining resilient to build failures which are expected when
746 dnl # detecting the available kernel interfaces.
747 dnl #
748 dnl # The maximum allowed parallelism can be controlled by setting the
749 dnl # TEST_JOBS environment variable. Otherwise, it default to $(nproc).
750 dnl #
751 AC_DEFUN([ZFS_LINUX_TEST_COMPILE_ALL], [
752 dnl # Phase 1 - Compilation only, final linking is skipped.
753 ZFS_LINUX_TEST_COMPILE([$1], [build])
755 dnl #
756 dnl # Phase 2 - When building external modules disable test cases
757 dnl # which failed to compile and invoke modpost to verify the
758 dnl # final linking.
759 dnl #
760 dnl # Test names suffixed with '_license' call modpost independently
761 dnl # to ensure that a single incompatibility does not result in the
762 dnl # modpost phase exiting early. This check is not performed on
763 dnl # every symbol since the majority are compatible and doing so
764 dnl # would significantly slow down this phase.
765 dnl #
766 dnl # When configuring for builtin (--enable-linux-builtin)
767 dnl # fake the linking step artificially create the expected .ko
768 dnl # files for tests which did compile. This is required for
769 dnl # kernels which do not have loadable module support or have
770 dnl # not yet been built.
771 dnl #
772 AS_IF([test "x$enable_linux_builtin" = "xno"], [
773 for dir in $(awk '/^obj-m/ { print [$]3 }' \
774 build/Makefile.compile.$1); do
775 name=${dir%/}
776 AS_IF([test -f build/$name/$name.o], [
777 AS_IF([test "${name##*_}" = "license"], [
778 ZFS_LINUX_TEST_MODPOST([$1],
779 [build/$name])
780 echo "obj-n += $dir" >>build/Makefile
781 ], [
782 echo "obj-m += $dir" >>build/Makefile
783 ])
784 ], [
785 echo "obj-n += $dir" >>build/Makefile
786 ])
787 done
789 ZFS_LINUX_TEST_MODPOST([$1], [build])
790 ], [
791 for dir in $(awk '/^obj-m/ { print [$]3 }' \
792 build/Makefile.compile.$1); do
793 name=${dir%/}
794 AS_IF([test -f build/$name/$name.o], [
795 touch build/$name/$name.ko
796 ])
797 done
798 ])
799 ])
801 dnl #
802 dnl # ZFS_LINUX_TEST_SRC
803 dnl #
804 dnl # $1 - name
805 dnl # $2 - global
806 dnl # $3 - source
807 dnl # $4 - extra cflags
808 dnl # $5 - check license-compatibility
809 dnl #
810 dnl # Check if the test source is buildable at all and then if it is
811 dnl # license compatible.
812 dnl #
813 dnl # N.B because all of the test cases are compiled in parallel they
814 dnl # must never depend on the results of previous tests. Each test
815 dnl # needs to be entirely independent.
816 dnl #
817 AC_DEFUN([ZFS_LINUX_TEST_SRC], [
818 ZFS_LINUX_CONFTEST_C([ZFS_LINUX_TEST_PROGRAM([[$2]], [[$3]],
819 [["Dual BSD/GPL"]])], [$1])
820 ZFS_LINUX_CONFTEST_MAKEFILE([$1], [yes], [$4])
822 AS_IF([ test -n "$5" ], [
823 ZFS_LINUX_CONFTEST_C([ZFS_LINUX_TEST_PROGRAM(
824 [[$2]], [[$3]], [[$5]])], [$1_license])
825 ZFS_LINUX_CONFTEST_MAKEFILE([$1_license], [yes], [$4])
826 ])
827 ])
829 dnl #
830 dnl # ZFS_LINUX_TEST_RESULT
831 dnl #
832 dnl # $1 - name of a test source (ZFS_LINUX_TEST_SRC)
833 dnl # $2 - run on success (valid .ko generated)
834 dnl # $3 - run on failure (unable to compile)
835 dnl #
836 AC_DEFUN([ZFS_LINUX_TEST_RESULT], [
837 AS_IF([test -d build/$1], [
838 AS_IF([test -f build/$1/$1.ko], [$2], [$3])
839 ], [
840 AC_MSG_ERROR([
841 *** No matching source for the "$1" test, check that
842 *** both the test source and result macros refer to the same name.
843 ])
844 ])
845 ])
847 dnl #
848 dnl # ZFS_LINUX_TEST_ERROR
849 dnl #
850 dnl # Generic error message which can be used when none of the expected
851 dnl # kernel interfaces were detected.
852 dnl #
853 AC_DEFUN([ZFS_LINUX_TEST_ERROR], [
854 AC_MSG_ERROR([
855 *** None of the expected "$1" interfaces were detected.
856 *** This may be because your kernel version is newer than what is
857 *** supported, or you are using a patched custom kernel with
858 *** incompatible modifications.
859 ***
860 *** ZFS Version: $ZFS_META_ALIAS
861 *** Compatible Kernels: $ZFS_META_KVER_MIN - $ZFS_META_KVER_MAX
862 ])
863 ])
865 dnl #
866 dnl # ZFS_LINUX_TEST_RESULT_SYMBOL
867 dnl #
868 dnl # Like ZFS_LINUX_TEST_RESULT except ZFS_CHECK_SYMBOL_EXPORT is called to
869 dnl # verify symbol exports, unless --enable-linux-builtin was provided to
870 dnl # configure.
871 dnl #
872 AC_DEFUN([ZFS_LINUX_TEST_RESULT_SYMBOL], [
873 AS_IF([ ! test -f build/$1/$1.ko], [
874 $5
875 ], [
876 AS_IF([test "x$enable_linux_builtin" != "xyes"], [
877 ZFS_CHECK_SYMBOL_EXPORT([$2], [$3], [$4], [$5])
878 ], [
879 $4
880 ])
881 ])
882 ])
884 dnl #
885 dnl # ZFS_LINUX_COMPILE_IFELSE
886 dnl #
887 AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
888 ZFS_LINUX_TEST_REMOVE([conftest])
890 m4_ifvaln([$1], [ZFS_LINUX_CONFTEST_C([$1], [conftest])])
891 m4_ifvaln([$5], [ZFS_LINUX_CONFTEST_H([$5], [conftest])],
892 [ZFS_LINUX_CONFTEST_H([], [conftest])])
894 ZFS_LINUX_CONFTEST_MAKEFILE([conftest], [no],
895 [m4_ifvaln([$5], [-I$PWD/build/conftest], [])])
896 ZFS_LINUX_COMPILE([build/conftest], [$2], [$3], [$4], [], [])
897 ])
899 dnl #
900 dnl # ZFS_LINUX_TRY_COMPILE
901 dnl #
902 dnl # $1 - global
903 dnl # $2 - source
904 dnl # $3 - run on success (valid .ko generated)
905 dnl # $4 - run on failure (unable to compile)
906 dnl #
907 dnl # When configuring as builtin (--enable-linux-builtin) for kernels
908 dnl # without loadable module support (CONFIG_MODULES=n) only the object
909 dnl # file is created. See ZFS_LINUX_TEST_COMPILE_ALL for details.
910 dnl #
911 AC_DEFUN([ZFS_LINUX_TRY_COMPILE], [
912 AS_IF([test "x$enable_linux_builtin" = "xyes"], [
913 ZFS_LINUX_COMPILE_IFELSE(
914 [ZFS_LINUX_TEST_PROGRAM([[$1]], [[$2]],
915 [[ZFS_META_LICENSE]])],
916 [test -f build/conftest/conftest.o], [$3], [$4])
917 ], [
918 ZFS_LINUX_COMPILE_IFELSE(
919 [ZFS_LINUX_TEST_PROGRAM([[$1]], [[$2]],
920 [[ZFS_META_LICENSE]])],
921 [test -f build/conftest/conftest.ko], [$3], [$4])
922 ])
923 ])
925 dnl #
926 dnl # ZFS_CHECK_SYMBOL_EXPORT
927 dnl #
928 dnl # Check if a symbol is exported on not by consulting the symbols
929 dnl # file, or optionally the source code.
930 dnl #
931 AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT], [
932 grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
933 $LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
934 rc=$?
935 if test $rc -ne 0; then
936 export=0
937 for file in $2; do
938 grep -q -E "EXPORT_SYMBOL.*($1)" \
939 "$LINUX/$file" 2>/dev/null
940 rc=$?
941 if test $rc -eq 0; then
942 export=1
943 break;
944 fi
945 done
946 if test $export -eq 0; then :
947 $4
948 else :
949 $3
950 fi
951 else :
952 $3
953 fi
954 ])
956 dnl #
957 dnl # ZFS_LINUX_TRY_COMPILE_SYMBOL
958 dnl #
959 dnl # Like ZFS_LINUX_TRY_COMPILER except ZFS_CHECK_SYMBOL_EXPORT is called
960 dnl # to verify symbol exports, unless --enable-linux-builtin was provided
961 dnl # to configure.
962 dnl #
963 AC_DEFUN([ZFS_LINUX_TRY_COMPILE_SYMBOL], [
964 ZFS_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
965 if test $rc -ne 0; then :
966 $6
967 else
968 if test "x$enable_linux_builtin" != xyes; then
969 ZFS_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
970 fi
971 if test $rc -ne 0; then :
972 $6
973 else :
974 $5
975 fi
976 fi
977 ])
979 dnl #
980 dnl # ZFS_LINUX_TRY_COMPILE_HEADER
981 dnl # like ZFS_LINUX_TRY_COMPILE, except the contents conftest.h are
982 dnl # provided via the fifth parameter
983 dnl #
984 AC_DEFUN([ZFS_LINUX_TRY_COMPILE_HEADER], [
985 AS_IF([test "x$enable_linux_builtin" = "xyes"], [
986 ZFS_LINUX_COMPILE_IFELSE(
987 [ZFS_LINUX_TEST_PROGRAM([[$1]], [[$2]],
988 [[ZFS_META_LICENSE]])],
989 [test -f build/conftest/conftest.o], [$3], [$4], [$5])
990 ], [
991 ZFS_LINUX_COMPILE_IFELSE(
992 [ZFS_LINUX_TEST_PROGRAM([[$1]], [[$2]],
993 [[ZFS_META_LICENSE]])],
994 [test -f build/conftest/conftest.ko], [$3], [$4], [$5])
995 ])
996 ])
998 dnl #
999 dnl # AS_VERSION_COMPARE_LE
1000 dnl # like AS_VERSION_COMPARE_LE, but runs $3 if (and only if) $1 <= $2
1001 dnl # AS_VERSION_COMPARE_LE (version-1, version-2, [action-if-less-or-equal], [action-if-greater])
1002 dnl #
1003 AC_DEFUN([AS_VERSION_COMPARE_LE], [
1004 AS_VERSION_COMPARE([$1], [$2], [$3], [$3], [$4])
1005 ])
1007 dnl #
1008 dnl # ZFS_LINUX_REQUIRE_API
1009 dnl # like ZFS_LINUX_TEST_ERROR, except only fails if the kernel is
1010 dnl # at least some specified version.
1011 dnl #
1012 AC_DEFUN([ZFS_LINUX_REQUIRE_API], [
1013 AS_VERSION_COMPARE_LE([$2], [$kernsrcver], [
1014 AC_MSG_ERROR([
1015 *** None of the expected "$1" interfaces were detected. This
1016 *** interface is expected for kernels version "$2" and above.
1017 *** This may be because your kernel version is newer than what is
1018 *** supported, or you are using a patched custom kernel with
1019 *** incompatible modifications. Newer kernels may have incompatible
1020 *** APIs.
1021 ***
1022 *** ZFS Version: $ZFS_META_ALIAS
1023 *** Compatible Kernels: $ZFS_META_KVER_MIN - $ZFS_META_KVER_MAX
1024 ])
1025 ], [
1026 AC_MSG_RESULT(no)
1027 ])
1028 ])