| blob | 056517a841f286e22097f97edc9318989f8e3503 |
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 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 esac
173 AC_MSG_CHECKING([for available kernel interfaces])
174 ZFS_LINUX_TEST_COMPILE_ALL([kabi])
175 AC_MSG_RESULT([done])
176 ])
178 dnl #
179 dnl # Check results of kernel interface tests.
180 dnl #
181 AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
182 ZFS_AC_KERNEL_ACCESS_OK_TYPE
183 ZFS_AC_KERNEL_GLOBAL_PAGE_STATE
184 ZFS_AC_KERNEL_OBJTOOL
185 ZFS_AC_KERNEL_PDE_DATA
186 ZFS_AC_KERNEL_FALLOCATE
187 ZFS_AC_KERNEL_FADVISE
188 ZFS_AC_KERNEL_GENERIC_FADVISE
189 ZFS_AC_KERNEL_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
190 ZFS_AC_KERNEL_RWSEM
191 ZFS_AC_KERNEL_SCHED
192 ZFS_AC_KERNEL_USLEEP_RANGE
193 ZFS_AC_KERNEL_KMEM_CACHE
194 ZFS_AC_KERNEL_KVMALLOC
195 ZFS_AC_KERNEL_VMALLOC_PAGE_KERNEL
196 ZFS_AC_KERNEL_WAIT
197 ZFS_AC_KERNEL_INODE_TIMES
198 ZFS_AC_KERNEL_INODE_LOCK
199 ZFS_AC_KERNEL_GROUP_INFO_GID
200 ZFS_AC_KERNEL_RW
201 ZFS_AC_KERNEL_TIMER_SETUP
202 ZFS_AC_KERNEL_SUPER_USER_NS
203 ZFS_AC_KERNEL_PROC_OPERATIONS
204 ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS
205 ZFS_AC_KERNEL_BIO
206 ZFS_AC_KERNEL_BLKDEV
207 ZFS_AC_KERNEL_BLK_QUEUE
208 ZFS_AC_KERNEL_GENHD_FLAGS
209 ZFS_AC_KERNEL_REVALIDATE_DISK
210 ZFS_AC_KERNEL_GET_DISK_RO
211 ZFS_AC_KERNEL_GENERIC_READLINK_GLOBAL
212 ZFS_AC_KERNEL_DISCARD_GRANULARITY
213 ZFS_AC_KERNEL_INODE_OWNER_OR_CAPABLE
214 ZFS_AC_KERNEL_XATTR
215 ZFS_AC_KERNEL_ACL
216 ZFS_AC_KERNEL_INODE_SETATTR
217 ZFS_AC_KERNEL_INODE_GETATTR
218 ZFS_AC_KERNEL_INODE_SET_FLAGS
219 ZFS_AC_KERNEL_INODE_SET_IVERSION
220 ZFS_AC_KERNEL_SHOW_OPTIONS
221 ZFS_AC_KERNEL_FILE_INODE
222 ZFS_AC_KERNEL_FILE_DENTRY
223 ZFS_AC_KERNEL_FSYNC
224 ZFS_AC_KERNEL_AIO_FSYNC
225 ZFS_AC_KERNEL_EVICT_INODE
226 ZFS_AC_KERNEL_DIRTY_INODE
227 ZFS_AC_KERNEL_SHRINKER
228 ZFS_AC_KERNEL_MKDIR
229 ZFS_AC_KERNEL_LOOKUP_FLAGS
230 ZFS_AC_KERNEL_CREATE
231 ZFS_AC_KERNEL_PERMISSION
232 ZFS_AC_KERNEL_GET_LINK
233 ZFS_AC_KERNEL_PUT_LINK
234 ZFS_AC_KERNEL_TMPFILE
235 ZFS_AC_KERNEL_AUTOMOUNT
236 ZFS_AC_KERNEL_ENCODE_FH_WITH_INODE
237 ZFS_AC_KERNEL_COMMIT_METADATA
238 ZFS_AC_KERNEL_CLEAR_INODE
239 ZFS_AC_KERNEL_SETATTR_PREPARE
240 ZFS_AC_KERNEL_INSERT_INODE_LOCKED
241 ZFS_AC_KERNEL_DENTRY
242 ZFS_AC_KERNEL_DENTRY_ALIAS_D_U
243 ZFS_AC_KERNEL_TRUNCATE_SETSIZE
244 ZFS_AC_KERNEL_SECURITY_INODE
245 ZFS_AC_KERNEL_FST_MOUNT
246 ZFS_AC_KERNEL_BDI
247 ZFS_AC_KERNEL_SET_NLINK
248 ZFS_AC_KERNEL_SGET
249 ZFS_AC_KERNEL_LSEEK_EXECUTE
250 ZFS_AC_KERNEL_VFS_FILEMAP_DIRTY_FOLIO
251 ZFS_AC_KERNEL_VFS_READ_FOLIO
252 ZFS_AC_KERNEL_VFS_GETATTR
253 ZFS_AC_KERNEL_VFS_FSYNC_2ARGS
254 ZFS_AC_KERNEL_VFS_ITERATE
255 ZFS_AC_KERNEL_VFS_DIRECT_IO
256 ZFS_AC_KERNEL_VFS_READPAGES
257 ZFS_AC_KERNEL_VFS_SET_PAGE_DIRTY_NOBUFFERS
258 ZFS_AC_KERNEL_VFS_RW_ITERATE
259 ZFS_AC_KERNEL_VFS_GENERIC_WRITE_CHECKS
260 ZFS_AC_KERNEL_VFS_IOV_ITER
261 ZFS_AC_KERNEL_VFS_COPY_FILE_RANGE
262 ZFS_AC_KERNEL_VFS_GENERIC_COPY_FILE_RANGE
263 ZFS_AC_KERNEL_VFS_REMAP_FILE_RANGE
264 ZFS_AC_KERNEL_VFS_CLONE_FILE_RANGE
265 ZFS_AC_KERNEL_VFS_DEDUPE_FILE_RANGE
266 ZFS_AC_KERNEL_VFS_FILE_OPERATIONS_EXTEND
267 ZFS_AC_KERNEL_KMAP_ATOMIC_ARGS
268 ZFS_AC_KERNEL_FOLLOW_DOWN_ONE
269 ZFS_AC_KERNEL_MAKE_REQUEST_FN
270 ZFS_AC_KERNEL_GENERIC_IO_ACCT
271 ZFS_AC_KERNEL_FPU
272 ZFS_AC_KERNEL_FMODE_T
273 ZFS_AC_KERNEL_KUIDGID_T
274 ZFS_AC_KERNEL_KUID_HELPERS
275 ZFS_AC_KERNEL_RENAME
276 ZFS_AC_KERNEL_CURRENT_TIME
277 ZFS_AC_KERNEL_USERNS_CAPABILITIES
278 ZFS_AC_KERNEL_IN_COMPAT_SYSCALL
279 ZFS_AC_KERNEL_KTIME
280 ZFS_AC_KERNEL_TOTALRAM_PAGES_FUNC
281 ZFS_AC_KERNEL_TOTALHIGH_PAGES
282 ZFS_AC_KERNEL_KSTRTOUL
283 ZFS_AC_KERNEL_PERCPU
284 ZFS_AC_KERNEL_CPU_HOTPLUG
285 ZFS_AC_KERNEL_GENERIC_FILLATTR
286 ZFS_AC_KERNEL_MKNOD
287 ZFS_AC_KERNEL_SYMLINK
288 ZFS_AC_KERNEL_BIO_MAX_SEGS
289 ZFS_AC_KERNEL_SIGNAL_STOP
290 ZFS_AC_KERNEL_SIGINFO
291 ZFS_AC_KERNEL_SYSFS
292 ZFS_AC_KERNEL_SET_SPECIAL_STATE
293 ZFS_AC_KERNEL_STANDALONE_LINUX_STDARG
294 ZFS_AC_KERNEL_PAGEMAP_FOLIO_WAIT_BIT
295 ZFS_AC_KERNEL_ADD_DISK
296 ZFS_AC_KERNEL_KTHREAD
297 ZFS_AC_KERNEL_ZERO_PAGE
298 ZFS_AC_KERNEL___COPY_FROM_USER_INATOMIC
299 ZFS_AC_KERNEL_USER_NS_COMMON_INUM
300 ZFS_AC_KERNEL_IDMAP_MNT_API
301 ZFS_AC_KERNEL_IATTR_VFSID
302 ZFS_AC_KERNEL_FILEMAP
303 ZFS_AC_KERNEL_WRITEPAGE_T
304 ZFS_AC_KERNEL_RECLAIMED
305 ZFS_AC_KERNEL_REGISTER_SYSCTL_TABLE
306 ZFS_AC_KERNEL_COPY_SPLICE_READ
307 ZFS_AC_KERNEL_SYNC_BDEV
308 case "$host_cpu" in
309 powerpc*)
310 ZFS_AC_KERNEL_CPU_HAS_FEATURE
311 ZFS_AC_KERNEL_FLUSH_DCACHE_PAGE
312 ;;
313 esac
314 ])
316 dnl #
317 dnl # Detect name used for Module.symvers file in kernel
318 dnl #
319 AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
320 modpost=$LINUX/scripts/Makefile.modpost
321 AC_MSG_CHECKING([kernel file name for module symbols])
322 AS_IF([test "x$enable_linux_builtin" != xyes -a -f "$modpost"], [
323 AS_IF([grep -q Modules.symvers $modpost], [
324 LINUX_SYMBOLS=Modules.symvers
325 ], [
326 LINUX_SYMBOLS=Module.symvers
327 ])
329 AS_IF([test ! -f "$LINUX_OBJ/$LINUX_SYMBOLS"], [
330 AC_MSG_ERROR([
331 *** Please make sure the kernel devel package for your distribution
332 *** is installed. If you are building with a custom kernel, make sure
333 *** the kernel is configured, built, and the '--with-linux=PATH'
334 *** configure option refers to the location of the kernel source.
335 ])
336 ])
337 ], [
338 LINUX_SYMBOLS=NONE
339 ])
340 AC_MSG_RESULT($LINUX_SYMBOLS)
341 AC_SUBST(LINUX_SYMBOLS)
342 ])
344 dnl #
345 dnl # Detect the kernel to be built against
346 dnl #
347 dnl # Most modern Linux distributions have separate locations for bare
348 dnl # source (source) and prebuilt (build) files. Additionally, there are
349 dnl # `source` and `build` symlinks in `/lib/modules/$(KERNEL_VERSION)`
350 dnl # pointing to them. The directory search order is now:
351 dnl #
352 dnl # - `configure` command line values if both `--with-linux` and
353 dnl # `--with-linux-obj` were defined
354 dnl #
355 dnl # - If only `--with-linux` was defined, `--with-linux-obj` is assumed
356 dnl # to have the same value as `--with-linux`
357 dnl #
358 dnl # - If neither `--with-linux` nor `--with-linux-obj` were defined
359 dnl # autodetection is used:
360 dnl #
361 dnl # - `/lib/modules/$(uname -r)/{source,build}` respectively, if exist.
362 dnl #
363 dnl # - If only `/lib/modules/$(uname -r)/build` exists, it is assumed
364 dnl # to be both source and build directory.
365 dnl #
366 dnl # - The first directory in `/lib/modules` with the highest version
367 dnl # number according to `sort -V` which contains both `source` and
368 dnl # `build` symlinks/directories. If module directory contains only
369 dnl # `build` component, it is assumed to be both source and build
370 dnl # directory.
371 dnl #
372 dnl # - Last resort: the first directory matching `/usr/src/kernels/*`
373 dnl # and `/usr/src/linux-*` with the highest version number according
374 dnl # to `sort -V` is assumed to be both source and build directory.
375 dnl #
376 AC_DEFUN([ZFS_AC_KERNEL], [
377 AC_ARG_WITH([linux],
378 AS_HELP_STRING([--with-linux=PATH],
379 [Path to kernel source]),
380 [kernelsrc="$withval"])
382 AC_ARG_WITH(linux-obj,
383 AS_HELP_STRING([--with-linux-obj=PATH],
384 [Path to kernel build objects]),
385 [kernelbuild="$withval"])
387 AC_MSG_CHECKING([kernel source and build directories])
388 AS_IF([test -n "$kernelsrc" && test -z "$kernelbuild"], [
389 kernelbuild="$kernelsrc"
390 ], [test -z "$kernelsrc"], [
391 AS_IF([test -e "/lib/modules/$(uname -r)/source" && \
392 test -e "/lib/modules/$(uname -r)/build"], [
393 src="/lib/modules/$(uname -r)/source"
394 build="/lib/modules/$(uname -r)/build"
395 ], [test -e "/lib/modules/$(uname -r)/build"], [
396 build="/lib/modules/$(uname -r)/build"
397 src="$build"
398 ], [
399 src=
401 for d in $(ls -1d /lib/modules/* 2>/dev/null | sort -Vr); do
402 if test -e "$d/source" && test -e "$d/build"; then
403 src="$d/source"
404 build="$d/build"
405 break
406 fi
408 if test -e "$d/build"; then
409 src="$d/build"
410 build="$d/build"
411 break
412 fi
413 done
415 # the least reliable method
416 if test -z "$src"; then
417 src=$(ls -1d /usr/src/kernels/* /usr/src/linux-* \
418 2>/dev/null | grep -v obj | sort -Vr | head -1)
419 build="$src"
420 fi
421 ])
423 AS_IF([test -n "$src" && test -e "$src"], [
424 kernelsrc=$(readlink -e "$src")
425 ], [
426 kernelsrc="[Not found]"
427 ])
428 AS_IF([test -n "$build" && test -e "$build"], [
429 kernelbuild=$(readlink -e "$build")
430 ], [
431 kernelbuild="[Not found]"
432 ])
433 ], [
434 AS_IF([test "$kernelsrc" = "NONE"], [
435 kernsrcver=NONE
436 ])
437 withlinux=yes
438 ])
440 AC_MSG_RESULT([done])
441 AC_MSG_CHECKING([kernel source directory])
442 AC_MSG_RESULT([$kernelsrc])
443 AC_MSG_CHECKING([kernel build directory])
444 AC_MSG_RESULT([$kernelbuild])
445 AS_IF([test ! -d "$kernelsrc" || test ! -d "$kernelbuild"], [
446 AC_MSG_ERROR([
447 *** Please make sure the kernel devel package for your distribution
448 *** is installed and then try again. If that fails, you can specify the
449 *** location of the kernel source and build with the '--with-linux=PATH' and
450 *** '--with-linux-obj=PATH' options respectively.])
451 ])
453 AC_MSG_CHECKING([kernel source version])
454 utsrelease1=$kernelbuild/include/linux/version.h
455 utsrelease2=$kernelbuild/include/linux/utsrelease.h
456 utsrelease3=$kernelbuild/include/generated/utsrelease.h
457 AS_IF([test -r $utsrelease1 && grep -qF UTS_RELEASE $utsrelease1], [
458 utsrelease=$utsrelease1
459 ], [test -r $utsrelease2 && grep -qF UTS_RELEASE $utsrelease2], [
460 utsrelease=$utsrelease2
461 ], [test -r $utsrelease3 && grep -qF UTS_RELEASE $utsrelease3], [
462 utsrelease=$utsrelease3
463 ])
465 AS_IF([test -n "$utsrelease"], [
466 kernsrcver=$($AWK '/UTS_RELEASE/ { gsub(/"/, "", $[3]); print $[3] }' $utsrelease)
467 AS_IF([test -z "$kernsrcver"], [
468 AC_MSG_RESULT([Not found])
469 AC_MSG_ERROR([
470 *** Cannot determine kernel version.
471 ])
472 ])
473 ], [
474 AC_MSG_RESULT([Not found])
475 if test "x$enable_linux_builtin" != xyes; then
476 AC_MSG_ERROR([
477 *** Cannot find UTS_RELEASE definition.
478 ])
479 else
480 AC_MSG_ERROR([
481 *** Cannot find UTS_RELEASE definition.
482 *** Please run 'make prepare' inside the kernel source tree.])
483 fi
484 ])
486 AC_MSG_RESULT([$kernsrcver])
488 AS_VERSION_COMPARE([$kernsrcver], [$ZFS_META_KVER_MIN], [
489 AC_MSG_ERROR([
490 *** Cannot build against kernel version $kernsrcver.
491 *** The minimum supported kernel version is $ZFS_META_KVER_MIN.
492 ])
493 ])
495 LINUX=${kernelsrc}
496 LINUX_OBJ=${kernelbuild}
497 LINUX_VERSION=${kernsrcver}
499 AC_SUBST(LINUX)
500 AC_SUBST(LINUX_OBJ)
501 AC_SUBST(LINUX_VERSION)
502 ])
504 dnl #
505 dnl # Detect the QAT module to be built against, QAT provides hardware
506 dnl # acceleration for data compression:
507 dnl #
508 dnl # https://01.org/intel-quickassist-technology
509 dnl #
510 dnl # 1) Download and install QAT driver from the above link
511 dnl # 2) Start QAT driver in your system:
512 dnl # service qat_service start
513 dnl # 3) Enable QAT in ZFS, e.g.:
514 dnl # ./configure --with-qat=<qat-driver-path>/QAT1.6
515 dnl # make
516 dnl # 4) Set GZIP compression in ZFS dataset:
517 dnl # zfs set compression = gzip <dataset>
518 dnl #
519 dnl # Then the data written to this ZFS pool is compressed by QAT accelerator
520 dnl # automatically, and de-compressed by QAT when read from the pool.
521 dnl #
522 dnl # 1) Get QAT hardware statistics with:
523 dnl # cat /proc/icp_dh895xcc_dev/qat
524 dnl # 2) To disable QAT:
525 dnl # insmod zfs.ko zfs_qat_disable=1
526 dnl #
527 AC_DEFUN([ZFS_AC_QAT], [
528 AC_ARG_WITH([qat],
529 AS_HELP_STRING([--with-qat=PATH],
530 [Path to qat source]),
531 AS_IF([test "$withval" = "yes"],
532 AC_MSG_ERROR([--with-qat=PATH requires a PATH]),
533 [qatsrc="$withval"]))
535 AC_ARG_WITH([qat-obj],
536 AS_HELP_STRING([--with-qat-obj=PATH],
537 [Path to qat build objects]),
538 [qatbuild="$withval"])
540 AS_IF([test ! -z "${qatsrc}"], [
541 AC_MSG_CHECKING([qat source directory])
542 AC_MSG_RESULT([$qatsrc])
543 QAT_SRC="${qatsrc}/quickassist"
544 AS_IF([ test ! -e "$QAT_SRC/include/cpa.h"], [
545 AC_MSG_ERROR([
546 *** Please make sure the qat driver package is installed
547 *** and specify the location of the qat source with the
548 *** '--with-qat=PATH' option then try again. Failed to
549 *** find cpa.h in:
550 ${QAT_SRC}/include])
551 ])
552 ])
554 AS_IF([test ! -z "${qatsrc}"], [
555 AC_MSG_CHECKING([qat build directory])
556 AS_IF([test -z "$qatbuild"], [
557 qatbuild="${qatsrc}/build"
558 ])
560 AC_MSG_RESULT([$qatbuild])
561 QAT_OBJ=${qatbuild}
562 AS_IF([ ! test -e "$QAT_OBJ/icp_qa_al.ko" && ! test -e "$QAT_OBJ/qat_api.ko"], [
563 AC_MSG_ERROR([
564 *** Please make sure the qat driver is installed then try again.
565 *** Failed to find icp_qa_al.ko or qat_api.ko in:
566 $QAT_OBJ])
567 ])
569 AC_SUBST(QAT_SRC)
570 AC_SUBST(QAT_OBJ)
572 AC_DEFINE(HAVE_QAT, 1,
573 [qat is enabled and existed])
574 ])
576 dnl #
577 dnl # Detect the name used for the QAT Module.symvers file.
578 dnl #
579 AS_IF([test ! -z "${qatsrc}"], [
580 AC_MSG_CHECKING([qat file for module symbols])
581 QAT_SYMBOLS=$QAT_SRC/lookaside/access_layer/src/Module.symvers
583 AS_IF([test -r $QAT_SYMBOLS], [
584 AC_MSG_RESULT([$QAT_SYMBOLS])
585 AC_SUBST(QAT_SYMBOLS)
586 ],[
587 AC_MSG_ERROR([
588 *** Please make sure the qat driver is installed then try again.
589 *** Failed to find Module.symvers in:
590 $QAT_SYMBOLS
591 ])
592 ])
593 ])
594 ])
596 dnl #
597 dnl # ZFS_LINUX_CONFTEST_H
598 dnl #
599 AC_DEFUN([ZFS_LINUX_CONFTEST_H], [
600 test -d build/$2 || mkdir -p build/$2
601 cat - <<_ACEOF >build/$2/$2.h
602 $1
603 _ACEOF
604 ])
606 dnl #
607 dnl # ZFS_LINUX_CONFTEST_C
608 dnl #
609 AC_DEFUN([ZFS_LINUX_CONFTEST_C], [
610 test -d build/$2 || mkdir -p build/$2
611 cat confdefs.h - <<_ACEOF >build/$2/$2.c
612 $1
613 _ACEOF
614 ])
616 dnl #
617 dnl # ZFS_LINUX_CONFTEST_MAKEFILE
618 dnl #
619 dnl # $1 - test case name
620 dnl # $2 - add to top-level Makefile
621 dnl # $3 - additional build flags
622 dnl #
623 AC_DEFUN([ZFS_LINUX_CONFTEST_MAKEFILE], [
624 test -d build || mkdir -p build
625 test -d build/$1 || mkdir -p build/$1
627 file=build/$1/Makefile
629 dnl # Example command line to manually build source.
630 cat - <<_ACEOF >$file
631 # Example command line to manually build source
632 # make modules -C $LINUX_OBJ $ARCH_UM M=$PWD/build/$1
634 ccflags-y := -Werror $FRAME_LARGER_THAN
635 _ACEOF
637 dnl # Additional custom CFLAGS as requested.
638 m4_ifval($3, [echo "ccflags-y += $3" >>$file], [])
640 dnl # Test case source
641 echo "obj-m := $1.o" >>$file
643 AS_IF([test "x$2" = "xyes"], [echo "obj-m += $1/" >>build/Makefile], [])
644 ])
646 dnl #
647 dnl # ZFS_LINUX_TEST_PROGRAM(C)([PROLOGUE], [BODY])
648 dnl #
649 m4_define([ZFS_LINUX_TEST_PROGRAM], [
650 #include <linux/module.h>
651 $1
653 int
654 main (void)
655 {
656 $2
657 ;
658 return 0;
659 }
661 MODULE_DESCRIPTION("conftest");
662 MODULE_AUTHOR(ZFS_META_AUTHOR);
663 MODULE_VERSION(ZFS_META_VERSION "-" ZFS_META_RELEASE);
664 MODULE_LICENSE($3);
665 ])
667 dnl #
668 dnl # ZFS_LINUX_TEST_REMOVE
669 dnl #
670 dnl # Removes the specified test source and results.
671 dnl #
672 AC_DEFUN([ZFS_LINUX_TEST_REMOVE], [
673 test -d build/$1 && rm -Rf build/$1
674 test -f build/Makefile && sed '/$1/d' build/Makefile
675 ])
677 dnl #
678 dnl # ZFS_LINUX_COMPILE
679 dnl #
680 dnl # $1 - build dir
681 dnl # $2 - test command
682 dnl # $3 - pass command
683 dnl # $4 - fail command
684 dnl # $5 - set KBUILD_MODPOST_NOFINAL='yes'
685 dnl # $6 - set KBUILD_MODPOST_WARN='yes'
686 dnl #
687 dnl # Used internally by ZFS_LINUX_TEST_{COMPILE,MODPOST}
688 dnl #
689 AC_DEFUN([ZFS_LINUX_COMPILE], [
690 AC_ARG_VAR([KERNEL_CC], [C compiler for
691 building kernel modules])
692 AC_ARG_VAR([KERNEL_LD], [Linker for
693 building kernel modules])
694 AC_ARG_VAR([KERNEL_LLVM], [Binary option to
695 build kernel modules with LLVM/CLANG toolchain])
696 AC_TRY_COMMAND([
697 KBUILD_MODPOST_NOFINAL="$5" KBUILD_MODPOST_WARN="$6"
698 make modules -k -j$TEST_JOBS ${KERNEL_CC:+CC=$KERNEL_CC}
699 ${KERNEL_LD:+LD=$KERNEL_LD} ${KERNEL_LLVM:+LLVM=$KERNEL_LLVM}
700 CONFIG_MODULES=y CFLAGS_MODULE=-DCONFIG_MODULES
701 -C $LINUX_OBJ $ARCH_UM M=$PWD/$1 >$1/build.log 2>&1])
702 AS_IF([AC_TRY_COMMAND([$2])], [$3], [$4])
703 ])
705 dnl #
706 dnl # ZFS_LINUX_TEST_COMPILE
707 dnl #
708 dnl # Perform a full compile excluding the final modpost phase.
709 dnl #
710 AC_DEFUN([ZFS_LINUX_TEST_COMPILE], [
711 ZFS_LINUX_COMPILE([$2], [test -f $2/build.log], [
712 mv $2/Makefile $2/Makefile.compile.$1
713 mv $2/build.log $2/build.log.$1
714 ],[
715 AC_MSG_ERROR([
716 *** Unable to compile test source to determine kernel interfaces.])
717 ], [yes], [])
718 ])
720 dnl #
721 dnl # ZFS_LINUX_TEST_MODPOST
722 dnl #
723 dnl # Perform a full compile including the modpost phase. This may
724 dnl # be an incremental build if the objects have already been built.
725 dnl #
726 AC_DEFUN([ZFS_LINUX_TEST_MODPOST], [
727 ZFS_LINUX_COMPILE([$2], [test -f $2/build.log], [
728 mv $2/Makefile $2/Makefile.modpost.$1
729 cat $2/build.log >>build/build.log.$1
730 ],[
731 AC_MSG_ERROR([
732 *** Unable to modpost test source to determine kernel interfaces.])
733 ], [], [yes])
734 ])
736 dnl #
737 dnl # Perform the compilation of the test cases in two phases.
738 dnl #
739 dnl # Phase 1) attempt to build the object files for all of the tests
740 dnl # defined by the ZFS_LINUX_TEST_SRC macro. But do not
741 dnl # perform the final modpost stage.
742 dnl #
743 dnl # Phase 2) disable all tests which failed the initial compilation,
744 dnl # then invoke the final modpost step for the remaining tests.
745 dnl #
746 dnl # This allows us efficiently build the test cases in parallel while
747 dnl # remaining resilient to build failures which are expected when
748 dnl # detecting the available kernel interfaces.
749 dnl #
750 dnl # The maximum allowed parallelism can be controlled by setting the
751 dnl # TEST_JOBS environment variable. Otherwise, it default to $(nproc).
752 dnl #
753 AC_DEFUN([ZFS_LINUX_TEST_COMPILE_ALL], [
754 dnl # Phase 1 - Compilation only, final linking is skipped.
755 ZFS_LINUX_TEST_COMPILE([$1], [build])
757 dnl #
758 dnl # Phase 2 - When building external modules disable test cases
759 dnl # which failed to compile and invoke modpost to verify the
760 dnl # final linking.
761 dnl #
762 dnl # Test names suffixed with '_license' call modpost independently
763 dnl # to ensure that a single incompatibility does not result in the
764 dnl # modpost phase exiting early. This check is not performed on
765 dnl # every symbol since the majority are compatible and doing so
766 dnl # would significantly slow down this phase.
767 dnl #
768 dnl # When configuring for builtin (--enable-linux-builtin)
769 dnl # fake the linking step artificially create the expected .ko
770 dnl # files for tests which did compile. This is required for
771 dnl # kernels which do not have loadable module support or have
772 dnl # not yet been built.
773 dnl #
774 AS_IF([test "x$enable_linux_builtin" = "xno"], [
775 for dir in $(awk '/^obj-m/ { print [$]3 }' \
776 build/Makefile.compile.$1); do
777 name=${dir%/}
778 AS_IF([test -f build/$name/$name.o], [
779 AS_IF([test "${name##*_}" = "license"], [
780 ZFS_LINUX_TEST_MODPOST([$1],
781 [build/$name])
782 echo "obj-n += $dir" >>build/Makefile
783 ], [
784 echo "obj-m += $dir" >>build/Makefile
785 ])
786 ], [
787 echo "obj-n += $dir" >>build/Makefile
788 ])
789 done
791 ZFS_LINUX_TEST_MODPOST([$1], [build])
792 ], [
793 for dir in $(awk '/^obj-m/ { print [$]3 }' \
794 build/Makefile.compile.$1); do
795 name=${dir%/}
796 AS_IF([test -f build/$name/$name.o], [
797 touch build/$name/$name.ko
798 ])
799 done
800 ])
801 ])
803 dnl #
804 dnl # ZFS_LINUX_TEST_SRC
805 dnl #
806 dnl # $1 - name
807 dnl # $2 - global
808 dnl # $3 - source
809 dnl # $4 - extra cflags
810 dnl # $5 - check license-compatibility
811 dnl #
812 dnl # Check if the test source is buildable at all and then if it is
813 dnl # license compatible.
814 dnl #
815 dnl # N.B because all of the test cases are compiled in parallel they
816 dnl # must never depend on the results of previous tests. Each test
817 dnl # needs to be entirely independent.
818 dnl #
819 AC_DEFUN([ZFS_LINUX_TEST_SRC], [
820 ZFS_LINUX_CONFTEST_C([ZFS_LINUX_TEST_PROGRAM([[$2]], [[$3]],
821 [["Dual BSD/GPL"]])], [$1])
822 ZFS_LINUX_CONFTEST_MAKEFILE([$1], [yes], [$4])
824 AS_IF([ test -n "$5" ], [
825 ZFS_LINUX_CONFTEST_C([ZFS_LINUX_TEST_PROGRAM(
826 [[$2]], [[$3]], [[$5]])], [$1_license])
827 ZFS_LINUX_CONFTEST_MAKEFILE([$1_license], [yes], [$4])
828 ])
829 ])
831 dnl #
832 dnl # ZFS_LINUX_TEST_RESULT
833 dnl #
834 dnl # $1 - name of a test source (ZFS_LINUX_TEST_SRC)
835 dnl # $2 - run on success (valid .ko generated)
836 dnl # $3 - run on failure (unable to compile)
837 dnl #
838 AC_DEFUN([ZFS_LINUX_TEST_RESULT], [
839 AS_IF([test -d build/$1], [
840 AS_IF([test -f build/$1/$1.ko], [$2], [$3])
841 ], [
842 AC_MSG_ERROR([
843 *** No matching source for the "$1" test, check that
844 *** both the test source and result macros refer to the same name.
845 ])
846 ])
847 ])
849 dnl #
850 dnl # ZFS_LINUX_TEST_ERROR
851 dnl #
852 dnl # Generic error message which can be used when none of the expected
853 dnl # kernel interfaces were detected.
854 dnl #
855 AC_DEFUN([ZFS_LINUX_TEST_ERROR], [
856 AC_MSG_ERROR([
857 *** None of the expected "$1" interfaces were detected.
858 *** This may be because your kernel version is newer than what is
859 *** supported, or you are using a patched custom kernel with
860 *** incompatible modifications.
861 ***
862 *** ZFS Version: $ZFS_META_ALIAS
863 *** Compatible Kernels: $ZFS_META_KVER_MIN - $ZFS_META_KVER_MAX
864 ])
865 ])
867 dnl #
868 dnl # ZFS_LINUX_TEST_RESULT_SYMBOL
869 dnl #
870 dnl # Like ZFS_LINUX_TEST_RESULT except ZFS_CHECK_SYMBOL_EXPORT is called to
871 dnl # verify symbol exports, unless --enable-linux-builtin was provided to
872 dnl # configure.
873 dnl #
874 AC_DEFUN([ZFS_LINUX_TEST_RESULT_SYMBOL], [
875 AS_IF([ ! test -f build/$1/$1.ko], [
876 $5
877 ], [
878 AS_IF([test "x$enable_linux_builtin" != "xyes"], [
879 ZFS_CHECK_SYMBOL_EXPORT([$2], [$3], [$4], [$5])
880 ], [
881 $4
882 ])
883 ])
884 ])
886 dnl #
887 dnl # ZFS_LINUX_COMPILE_IFELSE
888 dnl #
889 AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
890 ZFS_LINUX_TEST_REMOVE([conftest])
892 m4_ifvaln([$1], [ZFS_LINUX_CONFTEST_C([$1], [conftest])])
893 m4_ifvaln([$5], [ZFS_LINUX_CONFTEST_H([$5], [conftest])],
894 [ZFS_LINUX_CONFTEST_H([], [conftest])])
896 ZFS_LINUX_CONFTEST_MAKEFILE([conftest], [no],
897 [m4_ifvaln([$5], [-I$PWD/build/conftest], [])])
898 ZFS_LINUX_COMPILE([build/conftest], [$2], [$3], [$4], [], [])
899 ])
901 dnl #
902 dnl # ZFS_LINUX_TRY_COMPILE
903 dnl #
904 dnl # $1 - global
905 dnl # $2 - source
906 dnl # $3 - run on success (valid .ko generated)
907 dnl # $4 - run on failure (unable to compile)
908 dnl #
909 dnl # When configuring as builtin (--enable-linux-builtin) for kernels
910 dnl # without loadable module support (CONFIG_MODULES=n) only the object
911 dnl # file is created. See ZFS_LINUX_TEST_COMPILE_ALL for details.
912 dnl #
913 AC_DEFUN([ZFS_LINUX_TRY_COMPILE], [
914 AS_IF([test "x$enable_linux_builtin" = "xyes"], [
915 ZFS_LINUX_COMPILE_IFELSE(
916 [ZFS_LINUX_TEST_PROGRAM([[$1]], [[$2]],
917 [[ZFS_META_LICENSE]])],
918 [test -f build/conftest/conftest.o], [$3], [$4])
919 ], [
920 ZFS_LINUX_COMPILE_IFELSE(
921 [ZFS_LINUX_TEST_PROGRAM([[$1]], [[$2]],
922 [[ZFS_META_LICENSE]])],
923 [test -f build/conftest/conftest.ko], [$3], [$4])
924 ])
925 ])
927 dnl #
928 dnl # ZFS_CHECK_SYMBOL_EXPORT
929 dnl #
930 dnl # Check if a symbol is exported on not by consulting the symbols
931 dnl # file, or optionally the source code.
932 dnl #
933 AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT], [
934 grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
935 $LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
936 rc=$?
937 if test $rc -ne 0; then
938 export=0
939 for file in $2; do
940 grep -q -E "EXPORT_SYMBOL.*($1)" \
941 "$LINUX/$file" 2>/dev/null
942 rc=$?
943 if test $rc -eq 0; then
944 export=1
945 break;
946 fi
947 done
948 if test $export -eq 0; then :
949 $4
950 else :
951 $3
952 fi
953 else :
954 $3
955 fi
956 ])
958 dnl #
959 dnl # ZFS_LINUX_TRY_COMPILE_SYMBOL
960 dnl #
961 dnl # Like ZFS_LINUX_TRY_COMPILER except ZFS_CHECK_SYMBOL_EXPORT is called
962 dnl # to verify symbol exports, unless --enable-linux-builtin was provided
963 dnl # to configure.
964 dnl #
965 AC_DEFUN([ZFS_LINUX_TRY_COMPILE_SYMBOL], [
966 ZFS_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
967 if test $rc -ne 0; then :
968 $6
969 else
970 if test "x$enable_linux_builtin" != xyes; then
971 ZFS_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
972 fi
973 if test $rc -ne 0; then :
974 $6
975 else :
976 $5
977 fi
978 fi
979 ])
981 dnl #
982 dnl # ZFS_LINUX_TRY_COMPILE_HEADER
983 dnl # like ZFS_LINUX_TRY_COMPILE, except the contents conftest.h are
984 dnl # provided via the fifth parameter
985 dnl #
986 AC_DEFUN([ZFS_LINUX_TRY_COMPILE_HEADER], [
987 AS_IF([test "x$enable_linux_builtin" = "xyes"], [
988 ZFS_LINUX_COMPILE_IFELSE(
989 [ZFS_LINUX_TEST_PROGRAM([[$1]], [[$2]],
990 [[ZFS_META_LICENSE]])],
991 [test -f build/conftest/conftest.o], [$3], [$4], [$5])
992 ], [
993 ZFS_LINUX_COMPILE_IFELSE(
994 [ZFS_LINUX_TEST_PROGRAM([[$1]], [[$2]],
995 [[ZFS_META_LICENSE]])],
996 [test -f build/conftest/conftest.ko], [$3], [$4], [$5])
997 ])
998 ])
1000 dnl #
1001 dnl # AS_VERSION_COMPARE_LE
1002 dnl # like AS_VERSION_COMPARE_LE, but runs $3 if (and only if) $1 <= $2
1003 dnl # AS_VERSION_COMPARE_LE (version-1, version-2, [action-if-less-or-equal], [action-if-greater])
1004 dnl #
1005 AC_DEFUN([AS_VERSION_COMPARE_LE], [
1006 AS_VERSION_COMPARE([$1], [$2], [$3], [$3], [$4])
1007 ])
1009 dnl #
1010 dnl # ZFS_LINUX_REQUIRE_API
1011 dnl # like ZFS_LINUX_TEST_ERROR, except only fails if the kernel is
1012 dnl # at least some specified version.
1013 dnl #
1014 AC_DEFUN([ZFS_LINUX_REQUIRE_API], [
1015 AS_VERSION_COMPARE_LE([$2], [$kernsrcver], [
1016 AC_MSG_ERROR([
1017 *** None of the expected "$1" interfaces were detected. This
1018 *** interface is expected for kernels version "$2" and above.
1019 *** This may be because your kernel version is newer than what is
1020 *** supported, or you are using a patched custom kernel with
1021 *** incompatible modifications. Newer kernels may have incompatible
1022 *** APIs.
1023 ***
1024 *** ZFS Version: $ZFS_META_ALIAS
1025 *** Compatible Kernels: $ZFS_META_KVER_MIN - $ZFS_META_KVER_MAX
1026 ])
1027 ], [
1028 AC_MSG_RESULT(no)
1029 ])
1030 ])