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