config/kernel.m4

   1 dnl #
   2 dnl # Default ZFS kernel configuration
   3 dnl #
   4 AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
   5         ZFS_AC_KERNEL
   6         ZFS_AC_SPL
   7         ZFS_AC_KERNEL_CONFIG
   8         ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
   9         ZFS_AC_KERNEL_TYPE_FMODE_T
  10         ZFS_AC_KERNEL_KOBJ_NAME_LEN
  11         ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH
  12         ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE
  13         ZFS_AC_KERNEL_INVALIDATE_BDEV_ARGS
  14         ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE
  15         ZFS_AC_KERNEL_BIO_EMPTY_BARRIER
  16         ZFS_AC_KERNEL_BIO_FAILFAST
  17         ZFS_AC_KERNEL_BIO_FAILFAST_DTD
  18         ZFS_AC_KERNEL_REQ_FAILFAST_MASK
  19         ZFS_AC_KERNEL_BIO_END_IO_T_ARGS
  20         ZFS_AC_KERNEL_BIO_RW_SYNC
  21         ZFS_AC_KERNEL_BIO_RW_SYNCIO
  22         ZFS_AC_KERNEL_REQ_SYNC
  23         ZFS_AC_KERNEL_BLK_END_REQUEST
  24         ZFS_AC_KERNEL_BLK_FETCH_REQUEST
  25         ZFS_AC_KERNEL_BLK_REQUEUE_REQUEST
  26         ZFS_AC_KERNEL_BLK_RQ_BYTES
  27         ZFS_AC_KERNEL_BLK_RQ_POS
  28         ZFS_AC_KERNEL_BLK_RQ_SECTORS
  29         ZFS_AC_KERNEL_GET_DISK_RO
  30         ZFS_AC_KERNEL_RQ_IS_SYNC
  31         ZFS_AC_KERNEL_RQ_FOR_EACH_SEGMENT
  32         ZFS_AC_KERNEL_CONST_XATTR_HANDLER
  33         ZFS_AC_KERNEL_XATTR_HANDLER_GET
  34         ZFS_AC_KERNEL_XATTR_HANDLER_SET
  35         ZFS_AC_KERNEL_FSYNC_2ARGS
  36         ZFS_AC_KERNEL_EVICT_INODE
  37         ZFS_AC_KERNEL_INSERT_INODE_LOCKED
  38         ZFS_AC_KERNEL_D_OBTAIN_ALIAS
  39         ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE
  40
  41         if test "$LINUX_OBJ" != "$LINUX"; then
  42                 KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
  43         fi
  44         AC_SUBST(KERNELMAKE_PARAMS)
  45
  46
  47         dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
  48         dnl # compiler options are added by the kernel build system.
  49         KERNELCPPFLAGS="$KERNELCPPFLAGS -Wno-unused-but-set-variable"
  50         KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
  51         KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
  52
  53         AC_SUBST(KERNELCPPFLAGS)
  54 ])
  55
  56 dnl #
  57 dnl # Detect name used for Module.symvers file in kernel
  58 dnl #
  59 AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
  60         modpost=$LINUX/scripts/Makefile.modpost
  61         AC_MSG_CHECKING([kernel file name for module symbols])
  62         if test -f "$modpost"; then
  63                 if grep -q Modules.symvers $modpost; then
  64                         LINUX_SYMBOLS=Modules.symvers
  65                 else
  66                         LINUX_SYMBOLS=Module.symvers
  67                 fi
  68
  69                 if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
  70                         AC_MSG_ERROR([
  71         *** Please make sure the kernel devel package for your distribution
  72         *** is installed.  If your building with a custom kernel make sure the
  73         *** kernel is configured, built, and the '--with-linux=PATH' configure
  74         *** option refers to the location of the kernel source.])
  75                 fi
  76         else
  77                 LINUX_SYMBOLS=NONE
  78         fi
  79         AC_MSG_RESULT($LINUX_SYMBOLS)
  80         AC_SUBST(LINUX_SYMBOLS)
  81 ])
  82
  83 dnl #
  84 dnl # Detect the kernel to be built against
  85 dnl #
  86 AC_DEFUN([ZFS_AC_KERNEL], [
  87         AC_ARG_WITH([linux],
  88                 AS_HELP_STRING([--with-linux=PATH],
  89                 [Path to kernel source]),
  90                 [kernelsrc="$withval"])
  91
  92         AC_ARG_WITH(linux-obj,
  93                 AS_HELP_STRING([--with-linux-obj=PATH],
  94                 [Path to kernel build objects]),
  95                 [kernelbuild="$withval"])
  96
  97         AC_MSG_CHECKING([kernel source directory])
  98         if test -z "$kernelsrc"; then
  99                 if test -e "/lib/modules/$(uname -r)/source"; then
 100                         headersdir="/lib/modules/$(uname -r)/source"
 101                         sourcelink=$(readlink -f "$headersdir")
 102                 elif test -e "/lib/modules/$(uname -r)/build"; then
 103                         headersdir="/lib/modules/$(uname -r)/build"
 104                         sourcelink=$(readlink -f "$headersdir")
 105                 else
 106                         sourcelink=$(ls -1d /usr/src/kernels/* \
 107                                      /usr/src/linux-* \
 108                                      2>/dev/null | grep -v obj | tail -1)
 109                 fi
 110
 111                 if test -n "$sourcelink" && test -e ${sourcelink}; then
 112                         kernelsrc=`readlink -f ${sourcelink}`
 113                 else
 114                         AC_MSG_RESULT([Not found])
 115                         AC_MSG_ERROR([
 116         *** Please make sure the kernel devel package for your distribution
 117         *** is installed then try again.  If that fails you can specify the
 118         *** location of the kernel source with the '--with-linux=PATH' option.])
 119                 fi
 120         else
 121                 if test "$kernelsrc" = "NONE"; then
 122                         kernsrcver=NONE
 123                 fi
 124         fi
 125
 126         AC_MSG_RESULT([$kernelsrc])
 127         AC_MSG_CHECKING([kernel build directory])
 128         if test -z "$kernelbuild"; then
 129                 if test -e "/lib/modules/$(uname -r)/build"; then
 130                         kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
 131                 elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
 132                         kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
 133                 elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
 134                         kernelbuild=${kernelsrc}-obj/${target_cpu}/default
 135                 elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
 136                         kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
 137                 else
 138                         kernelbuild=${kernelsrc}
 139                 fi
 140         fi
 141         AC_MSG_RESULT([$kernelbuild])
 142
 143         AC_MSG_CHECKING([kernel source version])
 144         utsrelease1=$kernelbuild/include/linux/version.h
 145         utsrelease2=$kernelbuild/include/linux/utsrelease.h
 146         utsrelease3=$kernelbuild/include/generated/utsrelease.h
 147         if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
 148                 utsrelease=linux/version.h
 149         elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
 150                 utsrelease=linux/utsrelease.h
 151         elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
 152                 utsrelease=generated/utsrelease.h
 153         fi
 154
 155         if test "$utsrelease"; then
 156                 kernsrcver=`(echo "#include <$utsrelease>";
 157                              echo "kernsrcver=UTS_RELEASE") |
 158                              cpp -I $kernelbuild/include |
 159                              grep "^kernsrcver=" | cut -d \" -f 2`
 160
 161                 if test -z "$kernsrcver"; then
 162                         AC_MSG_RESULT([Not found])
 163                         AC_MSG_ERROR([*** Cannot determine kernel version.])
 164                 fi
 165         else
 166                 AC_MSG_RESULT([Not found])
 167                 AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
 168         fi
 169
 170         AC_MSG_RESULT([$kernsrcver])
 171
 172         LINUX=${kernelsrc}
 173         LINUX_OBJ=${kernelbuild}
 174         LINUX_VERSION=${kernsrcver}
 175
 176         AC_SUBST(LINUX)
 177         AC_SUBST(LINUX_OBJ)
 178         AC_SUBST(LINUX_VERSION)
 179
 180         ZFS_AC_MODULE_SYMVERS
 181 ])
 182
 183 dnl #
 184 dnl # Detect name used for the additional SPL Module.symvers file.  If one
 185 dnl # does not exist this is likely because the SPL has been configured
 186 dnl # but not built.  To allow recursive builds a good guess is made as to
 187 dnl # what this file will be named based on what it is named in the kernel
 188 dnl # build products.  This file will first be used at link time so if
 189 dnl # the guess is wrong the build will fail then.  This unfortunately
 190 dnl # means the ZFS package does not contain a reliable mechanism to
 191 dnl # detect symbols exported by the SPL at configure time.
 192 dnl #
 193 AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
 194         AC_MSG_CHECKING([spl file name for module symbols])
 195         if test -r $SPL_OBJ/Module.symvers; then
 196                 SPL_SYMBOLS=Module.symvers
 197         elif test -r $SPL_OBJ/Modules.symvers; then
 198                 SPL_SYMBOLS=Modules.symvers
 199         elif test -r $SPL_OBJ/module/Module.symvers; then
 200                 SPL_SYMBOLS=Module.symvers
 201         elif test -r $SPL_OBJ/module/Modules.symvers; then
 202                 SPL_SYMBOLS=Modules.symvers
 203         else
 204                 SPL_SYMBOLS=$LINUX_SYMBOLS
 205         fi
 206
 207         AC_MSG_RESULT([$SPL_SYMBOLS])
 208         AC_SUBST(SPL_SYMBOLS)
 209 ])
 210
 211 dnl #
 212 dnl # Detect the SPL module to be built against
 213 dnl #
 214 AC_DEFUN([ZFS_AC_SPL], [
 215         AC_ARG_WITH([spl],
 216                 AS_HELP_STRING([--with-spl=PATH],
 217                 [Path to spl source]),
 218                 [splsrc="$withval"])
 219
 220         AC_ARG_WITH([spl-obj],
 221                 AS_HELP_STRING([--with-spl-obj=PATH],
 222                 [Path to spl build objects]),
 223                 [splbuild="$withval"])
 224
 225
 226         AC_MSG_CHECKING([spl source directory])
 227         if test -z "$splsrc"; then
 228                 sourcelink=`ls -1d /usr/src/spl-*/${LINUX_VERSION} \
 229                             2>/dev/null | tail -1`
 230
 231                 if test -z "$sourcelink" || test ! -e $sourcelink; then
 232                         sourcelink=../spl
 233                 fi
 234
 235                 if test -e $sourcelink; then
 236                         splsrc=`readlink -f ${sourcelink}`
 237                 else
 238                         AC_MSG_RESULT([Not found])
 239                         AC_MSG_ERROR([
 240         *** Please make sure the spl devel package for your distribution
 241         *** is installed then try again.  If that fails you can specify the
 242         *** location of the spl source with the '--with-spl=PATH' option.])
 243                 fi
 244         else
 245                 if test "$splsrc" = "NONE"; then
 246                         splbuild=NONE
 247                         splsrcver=NONE
 248                 fi
 249         fi
 250
 251         AC_MSG_RESULT([$splsrc])
 252         AC_MSG_CHECKING([spl build directory])
 253         if test -z "$splbuild"; then
 254                 splbuild=${splsrc}
 255         fi
 256         AC_MSG_RESULT([$splbuild])
 257
 258         AC_MSG_CHECKING([spl source version])
 259         if test -r $splbuild/spl_config.h &&
 260                 fgrep -q SPL_META_VERSION $splbuild/spl_config.h; then
 261
 262                 splsrcver=`(echo "#include <spl_config.h>";
 263                             echo "splsrcver=SPL_META_VERSION") |
 264                             cpp -I $splbuild |
 265                             grep "^splsrcver=" | cut -d \" -f 2`
 266         fi
 267
 268         if test -z "$splsrcver"; then
 269                 AC_MSG_RESULT([Not found])
 270                 AC_MSG_ERROR([
 271                 *** Cannot determine the version of the spl source.
 272                 *** Please prepare the spl source before running this script])
 273         fi
 274
 275         AC_MSG_RESULT([$splsrcver])
 276
 277         SPL=${splsrc}
 278         SPL_OBJ=${splbuild}
 279         SPL_VERSION=${splsrcver}
 280
 281         AC_SUBST(SPL)
 282         AC_SUBST(SPL_OBJ)
 283         AC_SUBST(SPL_VERSION)
 284
 285         ZFS_AC_SPL_MODULE_SYMVERS
 286 ])
 287
 288 dnl #
 289 dnl # Certain kernel build options are not supported.  These must be
 290 dnl # detected at configure time and cause a build failure.  Otherwise
 291 dnl # modules may be successfully built that behave incorrectly.
 292 dnl #
 293 dnl # CONFIG_PREEMPT - Preempt kernels require special handling.
 294 dnl #
 295 dnl # There are certain kernel build options which when enabled are
 296 dnl # completely incompatible with non GPL kernel modules.  It is best
 297 dnl # to detect these at configure time and fail with a clear error
 298 dnl # rather than build everything and fail during linking.
 299 dnl #
 300 dnl # CONFIG_DEBUG_LOCK_ALLOC - Maps mutex_lock() to mutex_lock_nested()
 301 dnl #
 302 AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
 303
 304         ZFS_LINUX_CONFIG([PREEMPT],
 305                 AC_MSG_ERROR([
 306                 *** Kernel built with CONFIG_PREEMPT which is not supported.
 307                 ** You must rebuild your kernel without this option.]), [])
 308
 309         if test "$ZFS_META_LICENSE" = CDDL; then
 310                 ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC],
 311                 AC_MSG_ERROR([
 312                 *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is
 313                 *** incompatible with the CDDL license.  You must rebuild
 314                 *** your kernel without this option.]), [])
 315         fi
 316
 317         if test "$ZFS_META_LICENSE" = GPL; then
 318                 AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
 319                         [Define to 1 if licensed under the GPL])
 320         fi
 321 ])
 322
 323 dnl #
 324 dnl # ZFS_LINUX_CONFTEST
 325 dnl #
 326 AC_DEFUN([ZFS_LINUX_CONFTEST], [
 327 cat confdefs.h - <<_ACEOF >conftest.c
 328 $1
 329 _ACEOF
 330 ])
 331
 332 dnl #
 333 dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
 334 dnl #
 335 m4_define([ZFS_LANG_PROGRAM], [
 336 $1
 337 int
 338 main (void)
 339 {
 340 dnl Do *not* indent the following line: there may be CPP directives.
 341 dnl Don't move the `;' right after for the same reason.
 342 $2
 343   ;
 344   return 0;
 345 }
 346 ])
 347
 348 dnl #
 349 dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
 350 dnl #
 351 AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
 352         m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
 353         rm -Rf build && mkdir -p build
 354         echo "obj-m := conftest.o" >build/Makefile
 355         AS_IF(
 356                 [AC_TRY_COMMAND(cp conftest.c build && make [$2] -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build) >/dev/null && AC_TRY_COMMAND([$3])],
 357                 [$4],
 358                 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
 359         )
 360         rm -Rf build
 361 ])
 362
 363 dnl #
 364 dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
 365 dnl #
 366 AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
 367         [ZFS_LINUX_COMPILE_IFELSE(
 368         [AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
 369         [modules],
 370         [test -s build/conftest.o],
 371         [$3], [$4])
 372 ])
 373
 374 dnl #
 375 dnl # ZFS_LINUX_CONFIG
 376 dnl #
 377 AC_DEFUN([ZFS_LINUX_CONFIG],
 378         [AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
 379         ZFS_LINUX_TRY_COMPILE([
 380                 #ifndef AUTOCONF_INCLUDED
 381                 #include <linux/config.h>
 382                 #endif
 383         ],[
 384                 #ifndef CONFIG_$1
 385                 #error CONFIG_$1 not #defined
 386                 #endif
 387         ],[
 388                 AC_MSG_RESULT([yes])
 389                 $2
 390         ],[
 391                 AC_MSG_RESULT([no])
 392                 $3
 393         ])
 394 ])
 395
 396 dnl #
 397 dnl # ZFS_CHECK_SYMBOL_EXPORT
 398 dnl # check symbol exported or not
 399 dnl #
 400 AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT],
 401         [AC_MSG_CHECKING([whether symbol $1 is exported])
 402         grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
 403                 $LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
 404         rc=$?
 405         if test $rc -ne 0; then
 406                 export=0
 407                 for file in $2; do
 408                         grep -q -E "EXPORT_SYMBOL.*($1)" "$LINUX/$file" 2>/dev/null
 409                         rc=$?
 410                         if test $rc -eq 0; then
 411                                 export=1
 412                                 break;
 413                         fi
 414                 done
 415                 if test $export -eq 0; then
 416                         AC_MSG_RESULT([no])
 417                         $4
 418                 else
 419                         AC_MSG_RESULT([yes])
 420                         $3
 421                 fi
 422         else
 423                 AC_MSG_RESULT([yes])
 424                 $3
 425         fi
 426 ])