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