+#
+# LB_LINUX_INKERNEL
+#
+# in kernel compilation? (2.5 only)
+#
+AC_DEFUN([LB_LINUX_INKERNEL],
+[AC_MSG_CHECKING([if inkernel build support is requested])
+AC_ARG_ENABLE([inkernel],
+ AC_HELP_STRING([--enable-inkernel],
+ [set up 2.5 kernel makefiles]),
+ [],[enable_inkernel=no])
+AC_MSG_RESULT([$enable_inkernel])
+
+if test x$enable_inkernel = xyes ; then
+ echo ln -s `pwd` $LINUX/fs/lustre
+ rm $LINUX/fs/lustre
+ ln -s `pwd` $LINUX/fs/lustre
+ find portals lustre -name Makefile.mk | sed 's/.mk$//' | xargs -n 1 \
+ sh -e -x -c '(cp -f $0.mk $0.in)'
+fi
+])
+
+
+#
+# LB_LINUX_VERSION
+#
+# Set things accordingly for a 2.5 kernel
+#
+AC_DEFUN([LB_LINUX_VERSION],
+[AC_CHECK_FILE([$LINUX/include/linux/namei.h],
+ [
+ linux25="yes"
+ KMODEXT=".ko"
+ ],[
+ KMODEXT=".o"
+ linux25="no"
+ ])
+AC_MSG_CHECKING([if you are using Linux 2.6])
+AC_MSG_RESULT([$linux25])
+
+MODULE_TARGET="SUBDIRS"
+if test $linux25 = "yes" ; then
+ LB_CONFIG_INKERNEL
+
+ makerule="$PWD/build"
+ AC_MSG_CHECKING([for external module build support])
+ rm -f build/conftest.i
+ LB_LINUX_TRY_MAKE([],[],
+ [$makerule LUSTRE_KERNEL_TEST=conftest.i],
+ [test -s build/conftest.i],
+ [
+ AC_MSG_RESULT([no])
+ ],[
+ AC_MSG_RESULT([yes])
+ makerule="_module_$makerule"
+ MODULE_TARGET="M"
+ ])
+
+else
+ makerule="_dir_$PWD/build"
+fi
+
+AC_SUBST(MODULE_TARGET)
+AC_SUBST(LINUX25)
+AC_SUBST(KMODEXT)
+])
+
+#
+# LB_LINUX_PATH
+#
+# Find paths for linux, handling kernel-source rpms
+#
+AC_DEFUN([LB_LINUX_PATH],
+[AC_MSG_CHECKING([for Linux sources])
+AC_ARG_WITH([linux],
+ AC_HELP_STRING([--with-linux=path],
+ [set path to Linux source (default=/usr/src/linux)]),
+ [LINUX=$with_linux],
+ [LINUX=/usr/src/linux])
+AC_MSG_RESULT([$LINUX])
+AC_SUBST(LINUX)
+
+# -------- linux objects (for 2.6) --
+AC_MSG_CHECKING([for Linux objects dir])
+AC_ARG_WITH([linux-obj],
+ AC_HELP_STRING([--with-linux-obj=path],
+ [set path to Linux objects dir (default=$LINUX)]),
+ [LINUX_OBJ=$with_linux_obj],
+ [LINUX_OBJ=$LINUX])
+AC_MSG_RESULT([$LINUX_OBJ])
+AC_SUBST(LINUX_OBJ)
+
+# -------- check for .confg --------
+AC_ARG_WITH([linux-config],
+ [AC_HELP_STRING([--with-linux-config=path],
+ [set path to Linux .conf (default=$LINUX_OBJ/.config)])],
+ [LINUX_CONFIG=$with_linux_config],
+ [LINUX_CONFIG=$LINUX_OBJ/.config])
+AC_SUBST(LINUX_CONFIG)
+
+AC_CHECK_FILE([/boot/kernel.h],
+ [KERNEL_SOURCE_HEADER='/boot/kernel.h'],
+ [AC_CHECK_FILE([/var/adm/running-kernel.h]),
+ [KERNEL_SOURCE_HEADER='/var/adm/running-kernel.h']])
+
+AC_ARG_WITH([kernel-source-header],
+ AC_HELP_STRING([--with-kernel-source-header=path],
+ [Use a different kernel version header. Consult README.kernel-source for details.]),
+ [KERNEL_SOURCE_HEADER=$with_kernel_source_header])
+
+# ------------ .config exists ----------------
+AC_CHECK_FILE([$LINUX_CONFIG],[],
+ [AC_MSG_ERROR([Kernel config could not be found. If you are building from a kernel-source rpm consult README.kernel-source])])
+
+# ----------- make dep run? ------------------
+AC_CHECK_FILES([$LINUX_OBJ/include/linux/autoconf.h
+ $LINUX_OBJ/include/linux/version.h
+ $LINUX/include/linux/config.h],[],
+ [AC_MSG_ERROR([Run make config in $LINUX.])])
+
+# ------------ rhconfig.h includes runtime-generated bits --
+# red hat kernel-source checks
+
+# we know this exists after the check above. if the user
+# tarred up the tree and ran make dep etc. in it, then
+# version.h gets overwritten with a standard linux one.
+
+if grep rhconfig $LINUX_OBJ/include/linux/version.h >/dev/null ; then
+ # This is a clean kernel-source tree, we need to
+ # enable extensive workarounds to get this to build
+ # modules
+ AC_CHECK_FILE([$KERNEL_SOURCE_HEADER],
+ [if test $KERNEL_SOURCE_HEADER = '/boot/kernel.h' ; then
+ AC_MSG_WARN([Using /boot/kernel.h from RUNNING kernel.])
+ AC_MSG_WARN([If this is not what you want, use --with-kernel-source-header.])
+ AC_MSG_WARN([Consult README.kernel-source for details.])
+ fi],
+ [AC_MSG_ERROR([$KERNEL_SOURCE_HEADER not found. Consult README.kernel-source for details.])])
+ EXTRA_KCFLAGS="-include $KERNEL_SOURCE_HEADER $EXTRA_KCFLAGS"
+fi
+
+# this is needed before we can build modules
+LB_LINUX_VERSION
+
+# --- check that we can build modules at all
+AC_MSG_CHECKING([that modules can be built at all])
+LB_LINUX_TRY_COMPILE([],[],[
+ AC_MSG_RESULT([yes])
+],[
+ AC_MSG_RESULT([no])
+ AC_MSG_WARN([Consult config.log for details.])
+ AC_MSG_WARN([If you are trying to build with a kernel-source rpm, consult README.kernel-source])
+ AC_MSG_ERROR([Kernel modules could not be built.])
+])
+])
+
+#
+# LB_LINUX_UML
+#
+# check for a uml kernel
+#
+AC_DEFUN([LB_LINUX_UML],
+[ARCH_UM=
+UML_CFLAGS=
+
+AC_MSG_CHECKING([if you are running user mode linux for $target_cpu])
+if test -e $LINUX/include/asm-um ; then
+ if test X`ls -id $LINUX/include/asm/ 2>/dev/null | awk '{print [$]1}'` = X`ls -id $LINUX/include/asm-um 2>/dev/null | awk '{print [$]1}'` ; then
+ ARCH_UM='ARCH=um'
+ # see notes in Rules.in
+ UML_CFLAGS='-O0'
+ AC_MSG_RESULT(yes)
+ else
+ AC_MSG_RESULT([no (asm doesn't point at asm-um)])
+ fi
+else
+ AC_MSG_RESULT([no (asm-um missing)])
+fi
+AC_SUBST(ARCH_UM)
+AC_SUBST(UML_CFLAGS)
+])
+
+# these are like AC_TRY_COMPILE, but try to build modules against the
+# kernel, inside the build directory
+
+#
+# LB_LINUX_CONFTEST
+#
+# create a conftest.c file
+#
+AC_DEFUN([LB_LINUX_CONFTEST],
+[cat >conftest.c <<_ACEOF
+$1
+_ACEOF
+])
+
+#
+# LB_LINUX_COMPILE_IFELSE
+#
+# like AC_COMPILE_IFELSE
+#
+AC_DEFUN([LB_LINUX_COMPILE_IFELSE],
+[m4_ifvaln([$1], [LB_LINUX_CONFTEST([$1])])dnl
+rm -f build/conftest.o build/conftest.mod.c build/conftest.ko
+AS_IF([AC_TRY_COMMAND(cp conftest.c build && make [$2] CC="$CC" -f $PWD/build/Makefile LUSTRE_LINUX_CONFIG=$LINUX_CONFIG -o tmp_include_depends -o scripts -o include/config/MARKER -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM $MODULE_TARGET=$PWD/build) >/dev/null && AC_TRY_COMMAND([$3])],
+ [$4],
+ [_AC_MSG_LOG_CONFTEST
+m4_ifvaln([$5],[$5])dnl])dnl
+rm -f build/conftest.o build/conftest.mod.c build/conftest.mod.o build/conftest.ko m4_ifval([$1], [build/conftest.c conftest.c])[]dnl
+])
+
+#
+# LB_LINUX_TRY_COMPILE
+#
+# like AC_TRY_COMPILE
+#
+AC_DEFUN([LB_LINUX_TRY_COMPILE],
+[LB_LINUX_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM([[$1]], [[$2]])],
+ [modules],
+ [test -s build/conftest.o],
+ [$3], [$4])])
+
+#
+# LB_LINUX_CONFIG
+#
+# check if a given config option is defined
+#
+AC_DEFUN([LB_LINUX_CONFIG],
+[AC_MSG_CHECKING([if Linux was built with CONFIG_$1])
+LB_LINUX_TRY_COMPILE([#include <linux/config.h>],[
+#ifndef CONFIG_$1
+#error CONFIG_$1 not #defined
+#endif
+],[
+AC_MSG_RESULT([yes])
+$2
+],[
+AC_MSG_RESULT([no])
+$3
+])
+])
+
+#
+# LB_LINUX_TRY_MAKE
+#
+# like LB_LINUX_TRY_COMPILE, but with different arguments
+#
+AC_DEFUN([LB_LINUX_TRY_MAKE],
+[LB_LINUX_COMPILE_IFELSE([AC_LANG_PROGRAM([[$1]], [[$2]])], [$3], [$4], [$5], [$6])])
+
+#
+# LB_PROG_LINUX
+#
+# linux tests
+#
+AC_DEFUN([LB_PROG_LINUX],
+[LB_LINUX_PATH
+LB_LINUX_UML
+
+LB_LINUX_CONFIG([MODULES],[],[
+ AC_MSG_ERROR([module support is required to build Lustre kernel modules.])
+])
+
+LB_LINUX_CONFIG([MODVERSIONS])
+
+LB_LINUX_CONFIG([PREEMPT],[
+ AC_MSG_ERROR([Lustre does not support kernels with preempt enabled.])
+])
+
+LB_LINUX_CONFIG([KALLSYMS],[],[
+if test "x$ARCH_UM" = "x" ; then
+ AC_MSG_ERROR([Lustre requires that CONFIG_KALLSYMS is enabled in your kernel.])
+fi
+])
+
+# Portals tests
+LP_PROG_LINUX
+
+# Lustre tests
+LC_PROG_LINUX
+])
+
+#
+# LB_LINUX_STRUCT_PAGE_LIST
+#
+# 2.6.4 no longer has page->list
+#
+AC_DEFUN([LB_LINUX_STRUCT_PAGE_LIST],
+[AC_MSG_CHECKING([if struct page has a list field])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/mm.h>
+],[
+ struct page page;
+ &page.list;
+],[
+ AC_MSG_RESULT([yes])
+ AC_DEFINE(HAVE_PAGE_LIST, 1, [struct page has a list field])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+#
+# LB_LINUX_STRUCT_SIGHAND
+#
+# red hat 2.4 adds sighand to struct task_struct
+#
+AC_DEFUN([LB_LINUX_STRUCT_SIGHAND],
+[AC_MSG_CHECKING([if task_struct has a sighand field])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/sched.h>
+],[
+ struct task_struct p;
+ p.sighand = NULL;
+],[
+ AC_DEFINE(CONFIG_RH_2_4_20, 1, [this kernel contains Red Hat 2.4.20 patches])
+ AC_MSG_RESULT([yes])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+#
+# LB_LINUX_FUNC_CPU_ONLINE
+#
+# cpu_online is different in rh 2.4, vanilla 2.4, and 2.6
+#
+AC_DEFUN([LB_LINUX_FUNC_CPU_ONLINE],
+[AC_MSG_CHECKING([if kernel defines cpu_online()])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/sched.h>
+],[
+ cpu_online(0);
+],[
+ AC_MSG_RESULT([yes])
+ AC_DEFINE(HAVE_CPU_ONLINE, 1, [cpu_online found])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+#
+# LB_LINUX_TYPE_CPUMASK_T
+#
+# same goes for cpumask_t
+#
+AC_DEFUN([LB_LINUX_TYPE_CPUMASK_T],
+[AC_MSG_CHECKING([if kernel defines cpumask_t])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/sched.h>
+],[
+ return sizeof (cpumask_t);
+],[
+ AC_MSG_RESULT([yes])
+ AC_DEFINE(HAVE_CPUMASK_T, 1, [cpumask_t found])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+#
+# LB_LINUX_FUNC_SHOW_TASK
+#
+# we export show_task(), but not all kernels have it (yet)
+#
+AC_DEFUN([LB_LINUX_FUNC_SHOW_TASK],
+[AC_MSG_CHECKING([if kernel exports show_task])
+have_show_task=0
+for file in ksyms sched ; do
+ if grep -q "EXPORT_SYMBOL(show_task)" \
+ "$LINUX/kernel/$file.c" 2>/dev/null ; then
+ have_show_task=1
+ break
+ fi
+done
+if test x$have_show_task = x1 ; then
+ AC_DEFINE(HAVE_SHOW_TASK, 1, [show_task is exported])
+ AC_MSG_RESULT([yes])
+else
+ AC_MSG_RESULT([no])
+fi
+])
+
+#
+# LB_LINUX_CONFIG_EXT3
+#
+# that ext3 is enabled in the kernel
+#
+AC_DEFUN([LB_LINUX_CONFIG_EXT3],
+[LB_LINUX_CONFIG([EXT3_FS],[],[
+ LB_LINUX_CONFIG([EXT3_FS_MODULE],[],[$2])
+])
+LB_LINUX_CONFIG([EXT3_FS_XATTR],[$1],[$3])
+])
+
+#
+# LB_LINUX_FSHOOKS
+#
+# If we have (and can build) fshooks.h
+#
+AC_DEFUN([LB_LINUX_FSHOOKS],
+[AC_MSG_CHECKING([if this compiler can build a SuSE 2.6 kernel])
+# an excerpt from fshooks.h, which doesn't build with fedora's gcc 3.4
+LB_LINUX_TRY_COMPILE([
+ /* for the lack of a kernel-wide definition */
+ typedef enum {
+ false,
+ true
+ } boolean_t __attribute__((__mode__(__QI__)));
+],[],[
+ AC_MSG_RESULT([yes])
+],[
+ AC_MSG_RESULT([no])
+ AC_MSG_WARN([We suggest trying gcc 3.3.x.])
+ AC_MSG_WARN([You can set CC=gcc33 before running configure.])
+ AC_MSG_ERROR([Your compiler cannot build a SuSE 2.6 kernel.])
+])
+AC_MSG_CHECKING([if fshooks are present])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/fshooks.h>
+],[],[
+ AC_MSG_RESULT([yes])
+$1
+],[
+ AC_MSG_RESULT([no])
+$2
+])
+])
+
+#
+# LB_LINUX_STRUCT_KIOBUF
+#
+# rh 2.4.18 has iobuf->dovary, but other kernels do not
+#
+AC_DEFUN([LB_LINUX_STRUCT_KIOBUF],
+[AC_MSG_CHECKING([if struct kiobuf has a dovary field])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/iobuf.h>
+],[
+ struct kiobuf iobuf;
+ iobuf.dovary = 1;
+],[
+ AC_MSG_RESULT([yes])
+ AC_DEFINE(HAVE_KIOBUF_DOVARY, 1, [struct kiobuf has a dovary field])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+#
+# LB_LINUX_FUNC_COND_RESCHED
+#
+# cond_resched() was introduced in 2.4.20
+#
+AC_DEFUN([LB_LINUX_FUNC_COND_RESCHED],
+[AC_MSG_CHECKING([if kernel offers cond_resched])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/sched.h>
+],[
+ cond_resched();
+],[
+ AC_MSG_RESULT([yes])
+ AC_DEFINE(HAVE_COND_RESCHED, 1, [cond_resched found])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+#
+# LB_LINUX_FUNC_ZAP_PAGE_RANGE
+#
+# if zap_page_range() taks a vma arg
+#
+AC_DEFUN([LB_LINUX_FUNC_ZAP_PAGE_RANGE],
+[AC_MSG_CHECKING([if zap_pag_range with vma parameter])
+ZAP_PAGE_RANGE_VMA="`grep -c 'zap_page_range.*struct vm_area_struct' $LINUX/include/linux/mm.h`"
+if test "$ZAP_PAGE_RANGE_VMA" != 0 ; then
+ AC_DEFINE(ZAP_PAGE_RANGE_VMA, 1, [zap_page_range with vma parameter])
+ AC_MSG_RESULT([yes])
+else
+ AC_MSG_RESULT([no])
+fi
+])
+
+#
+# LB_LINUX_FUNC_PDE
+#
+# if proc_fs.h defines PDE()
+#
+AC_DEFUN([LB_LINUX_FUNC_PDE],
+[AC_MSG_CHECKING([if kernel defines PDE])
+HAVE_PDE="`grep -c 'proc_dir_entry..PDE' $LINUX/include/linux/proc_fs.h`"
+if test "$HAVE_PDE" != 0 ; then
+ AC_DEFINE(HAVE_PDE, 1, [the kernel defines PDE])
+ AC_MSG_RESULT([yes])
+else
+ AC_MSG_RESULT([no])
+fi
+])
+
+#
+# LB_LINUX_FUNC_DIRECT_IO
+#
+# if direct_IO takes a struct file argument
+#
+AC_DEFUN([LB_LINUX_FUNC_DIRECT_IO],
+[AC_MSG_CHECKING([if kernel passes struct file to direct_IO])
+HAVE_DIO_FILE="`grep -c 'direct_IO.*struct file' $LINUX/include/linux/fs.h`"
+if test "$HAVE_DIO_FILE" != 0 ; then
+ AC_DEFINE(HAVE_DIO_FILE, 1, [the kernel passes struct file to direct_IO])
+ AC_MSG_RESULT(yes)
+else
+ AC_MSG_RESULT(no)
+fi
+])
+
+#
+# LB_LINUX_HEADER_MM_INLINE
+#
+# RHEL kernels define page_count in mm_inline.h
+#
+AC_DEFUN([LB_LINUX_HEADER_MM_INLINE],
+[AC_MSG_CHECKING([if kernel has mm_inline.h header])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/mm_inline.h>
+],[
+ #ifndef page_count
+ #error mm_inline.h does not define page_count
+ #endif
+],[
+ AC_MSG_RESULT([yes])
+ AC_DEFINE(HAVE_MM_INLINE, 1, [mm_inline found])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+#
+# LB_LINUX_STRUCT_INODE
+#
+# if inode->i_alloc_sem exists
+#
+AC_DEFUN([LB_LINUX_STRUCT_INODE],
+[AC_MSG_CHECKING([if struct inode has i_alloc_sem])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/fs.h>
+ #include <linux/version.h>
+],[
+ #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,4,24))
+ #error "down_read_trylock broken before 2.4.24"
+ #endif
+ struct inode i;
+ return (char *)&i.i_alloc_sem - (char *)&i;
+],[
+ AC_MSG_RESULT([yes])
+ AC_DEFINE(HAVE_I_ALLOC_SEM, 1, [struct inode has i_alloc_sem])
+],[
+ AC_MSG_RESULT([no])
+])
+])