Make CONFIG_PREEMPT Fatal

[zfs.git] / config / kernel.m4

diff --git a/config/kernel.m4 b/config/kernel.m4
index 193aae1..8b4a5c7 100644 (file)
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -8,12 +8,18 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
        ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
        ZFS_AC_KERNEL_TYPE_FMODE_T
        ZFS_AC_KERNEL_KOBJ_NAME_LEN
+       ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH
        ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE
        ZFS_AC_KERNEL_INVALIDATE_BDEV_ARGS
        ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE
        ZFS_AC_KERNEL_BIO_EMPTY_BARRIER
+       ZFS_AC_KERNEL_BIO_FAILFAST
+       ZFS_AC_KERNEL_BIO_FAILFAST_DTD
+       ZFS_AC_KERNEL_REQ_FAILFAST_MASK
        ZFS_AC_KERNEL_BIO_END_IO_T_ARGS
+       ZFS_AC_KERNEL_BIO_RW_SYNC
        ZFS_AC_KERNEL_BIO_RW_SYNCIO
+       ZFS_AC_KERNEL_REQ_SYNC
        ZFS_AC_KERNEL_BLK_END_REQUEST
        ZFS_AC_KERNEL_BLK_FETCH_REQUEST
        ZFS_AC_KERNEL_BLK_REQUEUE_REQUEST
@@ -23,6 +29,11 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
        ZFS_AC_KERNEL_GET_DISK_RO
        ZFS_AC_KERNEL_RQ_IS_SYNC
        ZFS_AC_KERNEL_RQ_FOR_EACH_SEGMENT
+       ZFS_AC_KERNEL_CONST_XATTR_HANDLER
+       ZFS_AC_KERNEL_XATTR_HANDLER_GET
+       ZFS_AC_KERNEL_XATTR_HANDLER_SET
+       ZFS_AC_KERNEL_FSYNC_2ARGS
+       ZFS_AC_KERNEL_EVICT_INODE
 
        if test "$LINUX_OBJ" != "$LINUX"; then
                KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
@@ -73,8 +84,11 @@ AC_DEFUN([ZFS_AC_KERNEL], [
 
        AC_MSG_CHECKING([kernel source directory])
        if test -z "$kernelsrc"; then
-               headersdir="/lib/modules/$(uname -r)/build"
-               if test -e "$headersdir"; then
+               if test -e "/lib/modules/$(uname -r)/source"; then
+                       headersdir="/lib/modules/$(uname -r)/source"
+                       sourcelink=$(readlink -f "$headersdir")
+               elif test -e "/lib/modules/$(uname -r)/build"; then
+                       headersdir="/lib/modules/$(uname -r)/build"
                        sourcelink=$(readlink -f "$headersdir")
                else
                        sourcelink=$(ls -1d /usr/src/kernels/* \
@@ -100,7 +114,9 @@ AC_DEFUN([ZFS_AC_KERNEL], [
        AC_MSG_RESULT([$kernelsrc])
        AC_MSG_CHECKING([kernel build directory])
        if test -z "$kernelbuild"; then
-               if test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
+               if test -e "/lib/modules/$(uname -r)/build"; then
+                       kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
+               elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
                        kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
                elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
                        kernelbuild=${kernelsrc}-obj/${target_cpu}/default
@@ -258,6 +274,12 @@ AC_DEFUN([ZFS_AC_SPL], [
 ])
 
 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
 dnl # to detect these at configure time and fail with a clear error
@@ -267,6 +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([