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