From 15805c7711a69a293d7ab974a7e8f19c388836b4 Mon Sep 17 00:00:00 2001 From: Brian Behlendorf Date: Mon, 7 Mar 2011 10:59:26 -0800 Subject: [PATCH] Make CONFIG_PREEMPT Fatal 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. --- config/kernel.m4 | 11 ++++ configure | 144 +++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 155 insertions(+) diff --git a/config/kernel.m4 b/config/kernel.m4 index 492fbab14..8b4a5c79a 100644 --- a/config/kernel.m4 +++ b/config/kernel.m4 @@ -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([ diff --git a/configure b/configure index a9cfbbe1f..352b683e2 100755 --- a/configure +++ b/configure @@ -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 + #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 + #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; }