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