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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 10:58:07 -08:00
parent 47995fa691
commit 7731d46b69
2 changed files with 154 additions and 0 deletions
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configure
Vendored
+146
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@@ -11793,6 +11793,79 @@ $as_echo "$LINUX_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
$as_echo "no" >&6; }
fi
rm -Rf build
if test "${LINUX_OBJ}" != "${LINUX}"; then
KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
fi
@@ -15528,6 +15601,79 @@ $as_echo "$LINUX_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
$as_echo "no" >&6; }
fi
rm -Rf build
if test "${LINUX_OBJ}" != "${LINUX}"; then
KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
fi