diff --git a/config/kernel-dentry-operations.m4 b/config/kernel-dentry-operations.m4
index 0166ab888d3c..aa5a9f2aff39 100644
--- a/config/kernel-dentry-operations.m4
+++ b/config/kernel-dentry-operations.m4
@@ -1,77 +1,55 @@
 dnl #
 dnl # 2.6.28 API change
 dnl # Added d_obtain_alias() helper function.
 dnl #
 AC_DEFUN([ZFS_AC_KERNEL_SRC_D_OBTAIN_ALIAS], [
 	ZFS_LINUX_TEST_SRC([d_obtain_alias], [
 		#include <linux/dcache.h>
 	], [
 		d_obtain_alias(NULL);
 	])
 ])
 
 AC_DEFUN([ZFS_AC_KERNEL_D_OBTAIN_ALIAS], [
 	AC_MSG_CHECKING([whether d_obtain_alias() is available])
 	ZFS_LINUX_TEST_RESULT_SYMBOL([d_obtain_alias],
 	    [d_obtain_alias], [fs/dcache.c], [
 		AC_MSG_RESULT(yes)
 	], [
 		ZFS_LINUX_TEST_ERROR([d_obtain_alias()])
 	])
 ])
 
 dnl #
 dnl # 2.6.38 API change
 dnl # Added d_set_d_op() helper function.
 dnl #
 AC_DEFUN([ZFS_AC_KERNEL_SRC_D_SET_D_OP], [
 	ZFS_LINUX_TEST_SRC([d_set_d_op], [
 		#include <linux/dcache.h>
 	], [
 		d_set_d_op(NULL, NULL);
 	])
 ])
 
 AC_DEFUN([ZFS_AC_KERNEL_D_SET_D_OP], [
 	AC_MSG_CHECKING([whether d_set_d_op() is available])
 	ZFS_LINUX_TEST_RESULT_SYMBOL([d_set_d_op],
 	    [d_set_d_op], [fs/dcache.c], [
 		AC_MSG_RESULT(yes)
 	], [
 		ZFS_LINUX_TEST_ERROR([d_set_d_op])
 	])
 ])
 
-dnl #
-dnl # 2.6.38 API change
-dnl # Added sb->s_d_op default dentry_operations member
-dnl #
-AC_DEFUN([ZFS_AC_KERNEL_SRC_S_D_OP], [
-	ZFS_LINUX_TEST_SRC([super_block_s_d_op], [
-		#include <linux/fs.h>
-	],[
-		struct super_block sb __attribute__ ((unused));
-		sb.s_d_op = NULL;
-	])
-])
-
-AC_DEFUN([ZFS_AC_KERNEL_S_D_OP], [
-	AC_MSG_CHECKING([whether super_block has s_d_op])
-	ZFS_LINUX_TEST_RESULT([super_block_s_d_op], [
-		AC_MSG_RESULT(yes)
-	], [
-		ZFS_LINUX_TEST_ERROR([super_block s_d_op])
-	])
-])
-
 AC_DEFUN([ZFS_AC_KERNEL_SRC_DENTRY], [
         ZFS_AC_KERNEL_SRC_D_OBTAIN_ALIAS
         ZFS_AC_KERNEL_SRC_D_SET_D_OP
         ZFS_AC_KERNEL_SRC_S_D_OP
 ])
 
 AC_DEFUN([ZFS_AC_KERNEL_DENTRY], [
         ZFS_AC_KERNEL_D_OBTAIN_ALIAS
         ZFS_AC_KERNEL_D_SET_D_OP
         ZFS_AC_KERNEL_S_D_OP
 ])