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Make CONFIG_PREEMPT Fatal

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Until support is added for preemptible kernels detect this at
configure time and make it fatal.  Otherwise, it is possible to
have a successful build and kernel modules with flakey behavior.
This commit is contained in:
Brian Behlendorf 2011-03-07 10:59:26 -08:00
parent 5075c7ea69
commit 15805c7711
2 changed files with 155 additions and 0 deletions
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11
config/kernel.m4
View File

@ -273,6 +273,12 @@ AC_DEFUN([ZFS_AC_SPL], [
ZFS_AC_SPL_MODULE_SYMVERS
])
dnl #
dnl # Certain kernel build options are not supported. These must be
dnl # detected at configure time and cause a build failure. Otherwise
dnl # modules may be successfully built that behave incorrectly.
dnl #
dnl # CONFIG_PREEMPT - Preempt kernels require special handling.
dnl #
dnl # There are certain kernel build options which when enabled are
dnl # completely incompatible with non GPL kernel modules. It is best
@ -283,6 +289,11 @@ dnl # CONFIG_DEBUG_LOCK_ALLOC - Maps mutex_lock() to mutex_lock_nested()
dnl #
AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
ZFS_LINUX_CONFIG([PREEMPT],
AC_MSG_ERROR([
*** Kernel built with CONFIG_PREEMPT which is not supported.
** You must rebuild your kernel without this option.]), [])
if test "$ZFS_META_LICENSE" = CDDL; then
ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC],
AC_MSG_ERROR([

144
configure vendored
View File

@ -12086,6 +12086,78 @@ $as_echo "$SPL_SYMBOLS" >&6; }
{ $as_echo "$as_me:$LINENO: checking whether Linux was built with CONFIG_PREEMPT" >&5
$as_echo_n "checking whether Linux was built with CONFIG_PREEMPT... " >&6; }
cat confdefs.h - <<_ACEOF >conftest.c
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
#ifndef AUTOCONF_INCLUDED
#include <linux/config.h>
#endif
int
main (void)
{
#ifndef CONFIG_PREEMPT
#error CONFIG_PREEMPT not #defined
#endif
;
return 0;
}
_ACEOF
rm -Rf build && mkdir -p build
echo "obj-m := conftest.o" >build/Makefile
if { ac_try='cp conftest.c build && make modules -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build'
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
(eval $ac_try) 2>&5
ac_status=$?
$as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); }; } >/dev/null && { ac_try='test -s build/conftest.o'
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
(eval $ac_try) 2>&5
ac_status=$?
$as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); }; }; then
{ $as_echo "$as_me:$LINENO: result: yes" >&5
$as_echo "yes" >&6; }
{ { $as_echo "$as_me:$LINENO: error:
*** Kernel built with CONFIG_PREEMPT which is not supported.
** You must rebuild your kernel without this option." >&5
$as_echo "$as_me: error:
*** Kernel built with CONFIG_PREEMPT which is not supported.
** You must rebuild your kernel without this option." >&2;}
{ (exit 1); exit 1; }; }
else
$as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
{ $as_echo "$as_me:$LINENO: result: no" >&5
$as_echo "no" >&6; }
fi
rm -Rf build
if test "$ZFS_META_LICENSE" = CDDL; then
{ $as_echo "$as_me:$LINENO: checking whether Linux was built with CONFIG_DEBUG_LOCK_ALLOC" >&5
$as_echo_n "checking whether Linux was built with CONFIG_DEBUG_LOCK_ALLOC... " >&6; }
@ -16005,6 +16077,78 @@ $as_echo "$SPL_SYMBOLS" >&6; }
{ $as_echo "$as_me:$LINENO: checking whether Linux was built with CONFIG_PREEMPT" >&5
$as_echo_n "checking whether Linux was built with CONFIG_PREEMPT... " >&6; }
cat confdefs.h - <<_ACEOF >conftest.c
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
#ifndef AUTOCONF_INCLUDED
#include <linux/config.h>
#endif
int
main (void)
{
#ifndef CONFIG_PREEMPT
#error CONFIG_PREEMPT not #defined
#endif
;
return 0;
}
_ACEOF
rm -Rf build && mkdir -p build
echo "obj-m := conftest.o" >build/Makefile
if { ac_try='cp conftest.c build && make modules -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build'
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
(eval $ac_try) 2>&5
ac_status=$?
$as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); }; } >/dev/null && { ac_try='test -s build/conftest.o'
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
(eval $ac_try) 2>&5
ac_status=$?
$as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); }; }; then
{ $as_echo "$as_me:$LINENO: result: yes" >&5
$as_echo "yes" >&6; }
{ { $as_echo "$as_me:$LINENO: error:
*** Kernel built with CONFIG_PREEMPT which is not supported.
** You must rebuild your kernel without this option." >&5
$as_echo "$as_me: error:
*** Kernel built with CONFIG_PREEMPT which is not supported.
** You must rebuild your kernel without this option." >&2;}
{ (exit 1); exit 1; }; }
else
$as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
{ $as_echo "$as_me:$LINENO: result: no" >&5
$as_echo "no" >&6; }
fi
rm -Rf build
if test "$ZFS_META_LICENSE" = CDDL; then
{ $as_echo "$as_me:$LINENO: checking whether Linux was built with CONFIG_DEBUG_LOCK_ALLOC" >&5
$as_echo_n "checking whether Linux was built with CONFIG_DEBUG_LOCK_ALLOC... " >&6; }