lustre/portals/archdep.m4

   1 # -------- we can't build modules unless srcdir = builddir
   2 if test x$enable_modules != xno ; then
   3 AC_CHECK_FILE([autoMakefile.am],[],
   4         [AC_MSG_ERROR([At this time, Lustre does not support building kernel modules with srcdir != buildir.])])
   5 fi
   6
   7 # -------- in kernel compilation? (2.5 only) -------------
   8 AC_MSG_CHECKING([if inkernel build support is requested])
   9 AC_ARG_ENABLE([inkernel],
  10         AC_HELP_STRING([--enable-inkernel],
  11                        [set up 2.5 kernel makefiles]),
  12         [],[enable_inkernel=no])
  13 AC_MSG_RESULT([$enable_inkernel])
  14 AM_CONDITIONAL(INKERNEL, test x$enable_inkernel = xyes)
  15
  16 # -------- are we building against an external portals? -------
  17 AC_MSG_CHECKING([if Cray portals should be used])
  18 AC_ARG_WITH([cray-portals],
  19         AC_HELP_STRING([--with-cray-portals=path],
  20                        [path to cray portals]),
  21         [
  22                 CRAY_PORTALS_INCLUDE="-I$with_cray_portals"
  23                 AC_DEFINE(CRAY_PORTALS, 1, [Building with Cray Portals])
  24         ],[with_cray_portals=no])
  25 AC_MSG_RESULT([$with_cray_portals])
  26 AM_CONDITIONAL(CRAY_PORTALS, test x$with_cray_portals != xno)
  27 if test x$enable_tests = xno ; then
  28         AC_MSG_NOTICE([disabling tests])
  29         enable_tests=no
  30 fi
  31 if test x$enable_utils = xno ; then
  32         AC_MSG_NOTICE([disabling utilities])
  33         enable_utils=no
  34 fi
  35
  36 # -------- set linuxdir ------------
  37 AC_MSG_CHECKING([for Linux sources])
  38 AC_ARG_WITH([linux],
  39         AC_HELP_STRING([--with-linux=path],
  40                        [set path to Linux source (default=/usr/src/linux)]),
  41         [LINUX=$with_linux],
  42         [LINUX=/usr/src/linux])
  43 AC_MSG_RESULT([$LINUX])
  44 AC_SUBST(LINUX)
  45 if test x$enable_inkernel = xyes ; then
  46         echo ln -s `pwd` $LINUX/fs/lustre
  47         rm $LINUX/fs/lustre
  48         ln -s `pwd` $LINUX/fs/lustre
  49 fi
  50
  51 # -------- check for .confg --------
  52 AC_ARG_WITH([linux-config],
  53         [AC_HELP_STRING([--with-linux-config=path],
  54                         [set path to Linux .conf (default=\$LINUX/.config)])],
  55         [LINUX_CONFIG=$with_linux_config],
  56         [LINUX_CONFIG=$LINUX/.config])
  57 AC_SUBST(LINUX_CONFIG)
  58
  59 AC_CHECK_FILE([/boot/kernel.h],
  60         [KERNEL_SOURCE_HEADER='/boot/kernel.h'],
  61         [AC_CHECK_FILE([/var/adm/running-kernel.h]),
  62                 [KERNEL_SOURCE_HEADER='/var/adm/running-kernel.h']])
  63
  64 AC_ARG_WITH([kernel-source-header],
  65         AC_HELP_STRING([--with-kernel-source-header=path],
  66                         [Use a different kernel version header.  Consult README.kernel-source for details.]),
  67         [KERNEL_SOURCE_HEADER=$with_kernel_source_header])
  68
  69 #  --------------------
  70 ARCH_UM=
  71 UML_CFLAGS=
  72 if test x$enable_modules != xno ; then
  73         AC_MSG_CHECKING([if you are running user mode linux for $host_cpu])
  74         if test -e $LINUX/include/asm-um ; then
  75                 if test  X`ls -id $LINUX/include/asm/ | awk '{print $1}'` = X`ls -id $LINUX/include/asm-um | awk '{print $1}'` ; then
  76                         ARCH_UM='ARCH=um'
  77                         # see notes in Rules.in
  78                         UML_CFLAGS='-O0'
  79                         AC_MSG_RESULT(yes)
  80                 else
  81                         AC_MSG_RESULT([no (asm doesn't point at asm-um)])
  82                 fi
  83         else
  84                 AC_MSG_RESULT([no (asm-um missing)])
  85         fi
  86 fi
  87 AC_SUBST(ARCH_UM)
  88 AC_SUBST(UML_CFLAGS)
  89 # --------- Linux 25 ------------------
  90
  91 AC_CHECK_FILE([$LINUX/include/linux/namei.h],
  92         [
  93                 linux25="yes"
  94                 KMODEXT=".ko"
  95                 enable_ldiskfs="yes"
  96         ],[
  97                 KMODEXT=".o"
  98                 linux25="no"
  99         ])
 100 AC_MSG_CHECKING([if you are using Linux 2.6])
 101 AC_MSG_RESULT([$linux25])
 102 AM_CONDITIONAL(LINUX25, test x$linux25 = xyes)
 103 AC_SUBST(KMODEXT)
 104
 105 AC_PATH_PROG(PATCH, patch, [no])
 106 AC_PATH_PROG(QUILT, quilt, [no])
 107 AM_CONDITIONAL(USE_QUILT, test x$QUILT = xno)
 108
 109 if test x$enable_ldiskfs$enable_modules = xyesyes ; then
 110         if test x$PATCH$QUILT = xnono ; then
 111                 AC_MSG_ERROR([Quilt or patch are needed to build the ldiskfs module (for Linux 2.6)])
 112         fi
 113 fi
 114
 115 # -------  Makeflags ------------------
 116
 117 CPPFLAGS="$CRAY_PORTALS_INCLUDE $CRAY_PORTALS_COMMANDLINE -I\$(top_srcdir)/include -I\$(top_srcdir)/portals/include"
 118
 119 # liblustre are all the same
 120 LLCPPFLAGS="-D__arch_lib__ -D_LARGEFILE64_SOURCE=1"
 121 AC_SUBST(LLCPPFLAGS)
 122
 123 LLCFLAGS="-g -Wall -fPIC"
 124 AC_SUBST(LLCFLAGS)
 125
 126 # everyone builds against portals and lustre
 127
 128 if test x$enable_ldiskfs = xyes ; then
 129         AC_DEFINE(CONFIG_LDISKFS_FS_MODULE, 1, [build ldiskfs as a module])
 130         AC_DEFINE(CONFIG_LDISKFS_FS_XATTR, 1, [enable extended attributes for ldiskfs])
 131         AC_DEFINE(CONFIG_LDISKFS_FS_POSIX_ACL, 1, [enable posix acls])
 132         AC_DEFINE(CONFIG_LDISKFS_FS_SECURITY, 1, [enable fs security])
 133 fi
 134
 135 EXTRA_KCFLAGS="-g $CRAY_PORTALS_INCLUDE $CRAY_PORTALS_COMMANDLINE -I$PWD/portals/include -I$PWD/include"
 136
 137 # these are like AC_TRY_COMPILE, but try to build modules against the
 138 # kernel, inside the kernel-tests directory
 139
 140 AC_DEFUN([LUSTRE_MODULE_CONFTEST],
 141 [cat >conftest.c <<_ACEOF
 142 $1
 143 _ACEOF
 144 ])
 145
 146 AC_DEFUN([LUSTRE_MODULE_COMPILE_IFELSE],
 147 [m4_ifvaln([$1], [LUSTRE_MODULE_CONFTEST([$1])])dnl
 148 rm -f kernel-tests/conftest.o kernel-tests/conftest.mod.c kernel-tests/conftest.ko
 149 AS_IF([AC_TRY_COMMAND(cp conftest.c kernel-tests && make [$2] -f $PWD/kernel-tests/Makefile LUSTRE_LINUX_CONFIG=$LINUX_CONFIG -o tmp_include_depends -o scripts -o include/config/MARKER -C $LINUX EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM SUBDIRS=$PWD/kernel-tests) >/dev/null && AC_TRY_COMMAND([$3])],
 150         [$4],
 151         [_AC_MSG_LOG_CONFTEST
 152 m4_ifvaln([$5],[$5])dnl])dnl
 153 rm -f kernel-tests/conftest.o kernel-tests/conftest.mod.c kernel-tests/conftest.mod.o kernel-tests/conftest.ko m4_ifval([$1], [kernel-tests/conftest.c conftest.c])[]dnl
 154 ])
 155
 156 AC_DEFUN([LUSTRE_MODULE_TRY_COMPILE],
 157 [LUSTRE_MODULE_COMPILE_IFELSE(
 158         [AC_LANG_PROGRAM([[$1]], [[$2]])],
 159         [modules],
 160         [test -s kernel-tests/conftest.o],
 161         [$3], [$4])])
 162
 163 AC_DEFUN([LUSTRE_MODULE_TRY_MAKE],
 164 [LUSTRE_MODULE_COMPILE_IFELSE([AC_LANG_PROGRAM([[$1]], [[$2]])], [$3], [$4], [$5], [$6])])
 165
 166 # ------------ include paths ------------------
 167
 168 if test x$enable_modules != xno ; then
 169         # ------------ .config exists ----------------
 170         AC_CHECK_FILE([$LINUX_CONFIG],[],
 171                 [AC_MSG_ERROR([Kernel config could not be found.  If you are building from a kernel-source rpm consult README.kernel-source])])
 172
 173         # ----------- make dep run? ------------------
 174         AC_CHECK_FILES([$LINUX/include/linux/autoconf.h
 175                         $LINUX/include/linux/version.h
 176                         $LINUX/include/linux/config.h],[],
 177                 [AC_MSG_ERROR([Run make config in $LINUX.])])
 178
 179         # ------------ rhconfig.h includes runtime-generated bits --
 180         # red hat kernel-source checks
 181
 182         # we know this exists after the check above.  if the user
 183         # tarred up the tree and ran make dep etc. in it, then
 184         # version.h gets overwritten with a standard linux one.
 185
 186         if grep rhconfig $LINUX/include/linux/version.h >/dev/null ; then
 187                 # This is a clean kernel-source tree, we need to
 188                 # enable extensive workarounds to get this to build
 189                 # modules
 190                 AC_CHECK_FILE([$KERNEL_SOURCE_HEADER],
 191                         [if test $KERNEL_SOURCE_HEADER = '/boot/kernel.h' ; then
 192                                 AC_MSG_WARN([Using /boot/kernel.h from RUNNING kernel.])
 193                                 AC_MSG_WARN([If this is not what you want, use --with-kernel-source-header.])
 194                                 AC_MSG_WARN([Consult README.kernel-source for details.])
 195                         fi],
 196                         [AC_MSG_ERROR([$KERNEL_SOURCE_HEADER not found.  Consult README.kernel-source for details.])])
 197                 EXTRA_KCFLAGS="-include $KERNEL_SOURCE_HEADER $EXTRA_KCFLAGS"
 198         fi
 199
 200         # --- check that we can build modules at all
 201         AC_MSG_CHECKING([that modules can be built])
 202         LUSTRE_MODULE_TRY_COMPILE([],[],
 203                 [
 204                         AC_MSG_RESULT([yes])
 205                 ],[
 206                         AC_MSG_RESULT([no])
 207                         AC_MSG_WARN([Consult config.log for details.])
 208                         AC_MSG_WARN([If you are trying to build with a kernel-source rpm, consult README.kernel-source])
 209                         AC_MSG_ERROR([Kernel modules could not be built.])
 210                 ])
 211
 212         # ------------ LINUXRELEASE and moduledir ------------------
 213         AC_MSG_CHECKING([for Linux release])
 214         rm -f kernel-tests/conftest.i
 215         LINUXRELEASE=
 216         if test $linux25 = 'yes' ; then
 217                 makerule="$PWD/kernel-tests"
 218         else
 219                 makerule="_dir_$PWD/kernel-tests"
 220         fi
 221         LUSTRE_MODULE_TRY_MAKE(
 222                 [#include <linux/version.h>],
 223                 [char *LINUXRELEASE;
 224                  LINUXRELEASE=UTS_RELEASE;],
 225                 [$makerule LUSTRE_KERNEL_TEST=conftest.i],
 226                 [test -s kernel-tests/conftest.i],
 227                 [
 228                         # LINUXRELEASE="UTS_RELEASE"
 229                         eval $(grep "LINUXRELEASE=" kernel-tests/conftest.i)
 230                 ],[
 231                         AC_MSG_RESULT([unknown])
 232                         AC_MSG_ERROR([Could not preprocess test program.  Consult config.log for details.])
 233                 ])
 234         rm -f kernel-tests/conftest.i
 235         if test x$LINUXRELEASE = x ; then
 236                 AC_MSG_RESULT([unknown])
 237                 AC_MSG_ERROR([Could not determine Linux release version from linux/version.h.])
 238         fi
 239         AC_MSG_RESULT([$LINUXRELEASE])
 240         AC_SUBST(LINUXRELEASE)
 241
 242         moduledir='$(libdir)/modules/'$LINUXRELEASE/kernel
 243         AC_SUBST(moduledir)
 244
 245         modulefsdir='$(moduledir)/fs/$(PACKAGE)'
 246         AC_SUBST(modulefsdir)
 247
 248         # ------------ RELEASE --------------------------------
 249         AC_MSG_CHECKING([for Lustre release])
 250         RELEASE="`echo ${LINUXRELEASE} | tr '-' '_'`_`date +%Y%m%d%H%M`"
 251         AC_MSG_RESULT($RELEASE)
 252         AC_SUBST(RELEASE)
 253 fi
 254
 255 # ---------- Portals flags --------------------
 256
 257 #AC_PREFIX_DEFAULT([])
 258 #if test "x$prefix" = xNONE || test "x$prefix" = x; then
 259 #  usrprefix=/usr
 260 #else
 261 #  usrprefix='${prefix}'
 262 #fi
 263 #AC_SUBST(usrprefix)
 264
 265 AC_MSG_CHECKING([for zero-copy TCP support])
 266 AC_ARG_ENABLE([zerocopy],
 267         AC_HELP_STRING([--disable-zerocopy],
 268                        [disable socknal zerocopy]),
 269         [],[enable_zerocopy='yes'])
 270 if test x$enable_zerocopy = xno ; then
 271         AC_MSG_RESULT([no (by request)])
 272 else
 273         ZCCD="`grep -c zccd $LINUX/include/linux/skbuff.h`"
 274         if test "$ZCCD" != 0 ; then
 275                 AC_DEFINE(SOCKNAL_ZC, 1, [use zero-copy TCP])
 276                 AC_MSG_RESULT(yes)
 277         else
 278                 AC_MSG_RESULT([no (no kernel support)])
 279         fi
 280 fi
 281
 282 AC_MSG_CHECKING([for CPU affinity support])
 283 AC_ARG_ENABLE([affinity],
 284         AC_HELP_STRING([--disable-affinity],
 285                        [disable process/irq affinity]),
 286         [],[enable_affinity='yes'])
 287 if test x$enable_affinity = xno ; then
 288         AC_MSG_RESULT([no (by request)])
 289 else
 290         SET_CPUS_ALLOW="`grep -c set_cpus_allowed $LINUX/kernel/softirq.c`"
 291         if test "$SET_CPUS_ALLOW" != 0 ; then
 292                 AC_DEFINE(CPU_AFFINITY, 1, [kernel has cpu affinity support])
 293                 AC_MSG_RESULT([yes])
 294         else
 295                 AC_MSG_RESULT([no (no kernel support)])
 296         fi
 297 fi
 298
 299
 300 #####################################
 301
 302 AC_MSG_CHECKING([if quadrics kernel headers are present])
 303 if test -d $LINUX/drivers/net/qsnet ; then
 304         AC_MSG_RESULT([yes])
 305         QSWNAL="qswnal"
 306         AC_MSG_CHECKING([for multirail EKC])
 307         if test -f $LINUX/include/elan/epcomms.h; then
 308                 AC_MSG_RESULT([supported])
 309                 QSWCPPFLAGS="-DMULTIRAIL_EKC=1"
 310         else
 311                 AC_MSG_RESULT([not supported])
 312                 QSWCPPFLAGS="-I$LINUX/drivers/net/qsnet/include"
 313         fi
 314 else
 315         AC_MSG_RESULT([no])
 316         QSWNAL=""
 317         QSWCPPFLAGS=""
 318 fi
 319 AC_SUBST(QSWCPPFLAGS)
 320 AC_SUBST(QSWNAL)
 321 AM_CONDITIONAL(BUILD_QSWNAL, test x$QSWNAL = "xqswnal")
 322
 323 AC_MSG_CHECKING([if gm support was requested])
 324 AC_ARG_WITH([gm],
 325         AC_HELP_STRING([--with-gm=path],
 326                        [build gmnal against path]),
 327         [
 328                 case $with_gm in
 329                         yes)
 330                                 AC_MSG_RESULT([yes])
 331                                 GMCPPFLAGS="-I/usr/local/gm/include"
 332                                 GMNAL="gmnal"
 333                                 ;;
 334                         no)
 335                                 AC_MSG_RESULT([no])
 336                                 GMCPPFLAGS=""
 337                                 GMNAL=""
 338                                 ;;
 339                         *)
 340                                 AC_MSG_RESULT([yes])
 341                                 GMCPPFLAGS="-I$with_gm/include -I$with_gm/drivers -I$with_gm/drivers/linux/gm"
 342                                 GMNAL="gmnal"
 343                                 ;;
 344                 esac
 345         ],[
 346                 AC_MSG_RESULT([no])
 347                 GMCPPFLAGS=""
 348                 GMNAL=""
 349         ])
 350 AC_SUBST(GMCPPFLAGS)
 351 AC_SUBST(GMNAL)
 352 AM_CONDITIONAL(BUILD_GMNAL, test x$GMNAL = "xgmnal")
 353
 354 #fixme: where are the default IB includes?
 355 default_ib_include_dir=/usr/local/ib/include
 356 an_ib_include_file=vapi.h
 357
 358 AC_MSG_CHECKING([if ib nal support was requested])
 359 AC_ARG_WITH([ib],
 360         AC_HELP_STRING([--with-ib=yes/no/path],
 361                        [Path to IB includes]),
 362         [
 363                 case $with_ib in
 364                         yes)
 365                                 AC_MSG_RESULT([yes])
 366                                 IBCPPFLAGS="-I/usr/local/ib/include"
 367                                 IBNAL="ibnal"
 368                                 ;;
 369                         no)
 370                                 AC_MSG_RESULT([no])
 371                                 IBCPPFLAGS=""
 372                                 IBNAL=""
 373                                 ;;
 374                         *)
 375                                 AC_MSG_RESULT([yes])
 376                                 IBCPPFLAGS="-I$with_ib"
 377                                 IBNAL=""
 378                                 ;;
 379                 esac
 380         ],[
 381                 AC_MSG_RESULT([no])
 382                 IBFLAGS=""
 383                 IBNAL=""
 384         ])
 385 AC_SUBST(IBNAL)
 386 AC_SUBST(IBCPPFLAGS)
 387 AM_CONDITIONAL(BUILD_IBNAL, test x$IBNAL = "xibnal")
 388
 389 def_scamac=/opt/scali/include
 390 AC_MSG_CHECKING([if ScaMAC support was requested])
 391 AC_ARG_WITH([scamac],
 392         AC_HELP_STRING([--with-scamac=yes/no/path],
 393                        [Path to ScaMAC includes (default=/opt/scali/include)]),
 394         [
 395                 case $with_scamac in
 396                         yes)
 397                                 AC_MSG_RESULT([yes])
 398                                 SCIMACCPPFLAGS="-I/opt/scali/include"
 399                                 SCIMACNAL="scimacnal"
 400                                 ;;
 401                         no)
 402                                 AC_MSG_RESULT([no])
 403                                 SCIMACCPPFLAGS=""
 404                                 SCIMACNAL=""
 405                                 ;;
 406                         *)
 407                                 AC_MSG_RESULT([yes])
 408                                 SCIMACCPPFLAGS="-I$with_scamac -I$with_scamac/icm"
 409                                 SCIMACNAL="scimacnal"
 410                                 ;;
 411                 esac
 412         ],[
 413                 AC_MSG_RESULT([no])
 414                 SCIMACCPPFLAGS=""
 415                 SCIMACNAL=""
 416         ])
 417 AC_SUBST(SCIMACCPPFLAGS)
 418 AC_SUBST(SCIMACNAL)
 419 AM_CONDITIONAL(BUILD_SCIMACNAL, test x$SCIMACNAL = "xscimacnal")
 420 # if test "$with_scamac" != no -a -f ${with_scamac}/scamac.h; then
 421
 422 AC_SUBST(MOD_LINK)
 423 AC_SUBST(LINUX25)
 424
 425 # ---------- Red Hat 2.4.18 has iobuf->dovary --------------
 426 # But other kernels don't
 427
 428 AC_MSG_CHECKING([if struct kiobuf has a dovary field])
 429 LUSTRE_MODULE_TRY_COMPILE(
 430         [
 431                 #include <linux/iobuf.h>
 432         ],[
 433                 struct kiobuf iobuf;
 434                 iobuf.dovary = 1;
 435         ],[
 436                 AC_MSG_RESULT([yes])
 437                 AC_DEFINE(HAVE_KIOBUF_DOVARY, 1, [struct kiobuf has a dovary field])
 438         ],[
 439                 AC_MSG_RESULT([no])
 440         ])
 441
 442 # ----------- 2.6.4 no longer has page->list ---------------
 443 AC_MSG_CHECKING([if struct page has a list field])
 444 LUSTRE_MODULE_TRY_COMPILE(
 445         [
 446                 #include <linux/mm.h>
 447         ],[
 448                 struct page page;
 449                 &page.list;
 450         ],[
 451                 AC_MSG_RESULT([yes])
 452                 AC_DEFINE(HAVE_PAGE_LIST, 1, [struct page has a list field])
 453         ],[
 454                 AC_MSG_RESULT([no])
 455         ])
 456
 457 # ---------- Red Hat 2.4.20 backports some 2.5 bits --------
 458 # This needs to run after we've defined the KCPPFLAGS
 459
 460 AC_MSG_CHECKING([if task_struct has a sighand field])
 461 LUSTRE_MODULE_TRY_COMPILE(
 462         [
 463                 #include <linux/sched.h>
 464         ],[
 465                 struct task_struct p;
 466                 p.sighand = NULL;
 467         ],[
 468                 AC_DEFINE(CONFIG_RH_2_4_20, 1, [this kernel contains Red Hat 2.4.20 patches])
 469                 AC_MSG_RESULT([yes])
 470         ],[
 471                 AC_MSG_RESULT([no])
 472         ])
 473
 474 # ---------- 2.4.20 introduced cond_resched --------------
 475
 476 AC_MSG_CHECKING([if kernel offers cond_resched])
 477 LUSTRE_MODULE_TRY_COMPILE(
 478         [
 479                 #include <linux/sched.h>
 480         ],[
 481                 cond_resched();
 482         ],[
 483                 AC_MSG_RESULT([yes])
 484                 AC_DEFINE(HAVE_COND_RESCHED, 1, [cond_resched found])
 485         ],[
 486                 AC_MSG_RESULT([no])
 487         ])
 488
 489 # ---------- Red Hat 2.4.21 backports some more 2.5 bits --------
 490
 491 AC_MSG_CHECKING([if kernel defines PDE])
 492 HAVE_PDE="`grep -c 'proc_dir_entry..PDE' $LINUX/include/linux/proc_fs.h`"
 493 if test "$HAVE_PDE" != 0 ; then
 494         AC_DEFINE(HAVE_PDE, 1, [the kernel defines PDE])
 495         AC_MSG_RESULT([yes])
 496 else
 497         AC_MSG_RESULT([no])
 498 fi
 499
 500 AC_MSG_CHECKING([if kernel passes struct file to direct_IO])
 501 HAVE_DIO_FILE="`grep -c 'direct_IO.*struct file' $LINUX/include/linux/fs.h`"
 502 if test "$HAVE_DIO_FILE" != 0 ; then
 503         AC_DEFINE(HAVE_DIO_FILE, 1, [the kernel passes struct file to direct_IO])
 504         AC_MSG_RESULT(yes)
 505 else
 506         AC_MSG_RESULT(no)
 507 fi
 508
 509 if test x$enable_modules != xno ; then
 510         # ---------- modules? ------------------------
 511         AC_MSG_CHECKING([for module support])
 512         LUSTRE_MODULE_TRY_COMPILE(
 513                 [
 514                         #include <linux/config.h>
 515                 ],[
 516                         #ifndef CONFIG_MODULES
 517                         #error CONFIG_MODULES not #defined
 518                         #endif
 519                 ],[
 520                         AC_MSG_RESULT([yes])
 521                 ],[
 522                         AC_MSG_RESULT([no])
 523                         AC_MSG_ERROR([module support is required to build Lustre kernel modules.])
 524                 ])
 525
 526         # ---------- modversions? --------------------
 527         AC_MSG_CHECKING([for MODVERSIONS])
 528         LUSTRE_MODULE_TRY_COMPILE(
 529                 [
 530                         #include <linux/config.h>
 531                 ],[
 532                         #ifndef CONFIG_MODVERSIONS
 533                         #error CONFIG_MODVERSIONS not #defined
 534                         #endif
 535                 ],[
 536                         AC_MSG_RESULT([yes])
 537                 ],[
 538                         AC_MSG_RESULT([no])
 539                 ])
 540
 541         # ------------ preempt -----------------------
 542         AC_MSG_CHECKING([if preempt is enabled])
 543         LUSTRE_MODULE_TRY_COMPILE(
 544                 [
 545                         #include <linux/config.h>
 546                 ],[
 547                         #ifndef CONFIG_PREEMPT
 548                         #error CONFIG_PREEMPT is not #defined
 549                         #endif
 550                 ],[
 551                         AC_MSG_RESULT([yes])
 552                         AC_MSG_ERROR([Lustre does not support kernels with preempt enabled.])
 553                 ],[
 554                         AC_MSG_RESULT([no])
 555                 ])
 556
 557         if test $BACKINGFS = 'ext3' ; then
 558                 # --- Check that ext3 and ext3 xattr are enabled in the kernel
 559                 AC_MSG_CHECKING([that ext3 is enabled in the kernel])
 560                 LUSTRE_MODULE_TRY_COMPILE(
 561                         [
 562                                 #include <linux/config.h>
 563                         ],[
 564                                 #ifndef CONFIG_EXT3_FS
 565                                 #ifndef CONFIG_EXT3_FS_MODULE
 566                                 #error CONFIG_EXT3_FS not #defined
 567                                 #endif
 568                                 #endif
 569                         ],[
 570                                 AC_MSG_RESULT([yes])
 571                         ],[
 572                                 AC_MSG_RESULT([no])
 573                                 AC_MSG_ERROR([Lustre requires that ext3 is enabled in the kernel (CONFIG_EXT3_FS)])
 574                         ])
 575
 576                 AC_MSG_CHECKING([that extended attributes for ext3 are enabled in the kernel])
 577                 LUSTRE_MODULE_TRY_COMPILE(
 578                         [
 579                                 #include <linux/config.h>
 580                         ],[
 581                                 #ifndef CONFIG_EXT3_FS_XATTR
 582                                 #error CONFIG_EXT3_FS_XATTR not #defined
 583                                 #endif
 584                         ],[
 585                                 AC_MSG_RESULT([yes])
 586                         ],[
 587                                 AC_MSG_RESULT([no])
 588                                 AC_MSG_WARN([Lustre requires that extended attributes for ext3 are enabled in the kernel (CONFIG_EXT3_FS_XATTR.)])
 589                                 AC_MSG_WARN([This build may fail.])
 590                         ])
 591         fi # BACKINGFS = ext3
 592 fi
 593
 594 CPPFLAGS="-include \$(top_builddir)/include/config.h $CPPFLAGS"
 595 EXTRA_KCFLAGS="-include $PWD/include/config.h $EXTRA_KCFLAGS"
 596 AC_SUBST(EXTRA_KCFLAGS)
 597
 598 #echo "KCPPFLAGS: $KCPPFLAGS"
 599 #echo "KCFLAGS: $KCFLAGS"
 600 #echo "LLCPPFLAGS: $LLCPPFLAGS"
 601 #echo "LLCFLAGS: $LLCFLAGS"
 602 #echo "MOD_LINK: $MOD_LINK"
 603 #echo "CFLAGS: $CFLAGS"
 604 #echo "CPPFLAGS: $CPPFLAGS"