diff --git a/config/kernel-dentry-alias.m4 b/config/kernel-dentry-alias.m4
new file mode 100644
index 000000000..0baf1a06d
--- /dev/null
+++ b/config/kernel-dentry-alias.m4
@@ -0,0 +1,32 @@
+dnl # SPDX-License-Identifier: CDDL-1.0
+dnl #
+dnl # 7.1 API change
+dnl # d_u union in struct dentry is now anonmymous, so d_alias must be
+dnl # named directly
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_DENTRY_ALIAS_D_U], [
+	ZFS_LINUX_TEST_SRC([dentry_alias_d_u], [
+		#include <linux/fs.h>
+		#include <linux/dcache.h>
+		#include <linux/list.h>
+	], [
+		struct inode *inode __attribute__ ((unused)) = NULL;
+		struct dentry *dentry __attribute__ ((unused)) = NULL;
+		hlist_for_each_entry(dentry, &inode->i_dentry,
+		    d_u.d_alias) {
+			d_drop(dentry);
+		}
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_DENTRY_ALIAS_D_U], [
+	AC_MSG_CHECKING([whether dentry aliases are in d_u member])
+	ZFS_LINUX_TEST_RESULT([dentry_alias_d_u], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_DENTRY_D_U_ALIASES, 1,
+		    [dentry aliases are in d_u member])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])
+
diff --git a/config/kernel.m4 b/config/kernel.m4
index fd36ae42d..05f59745d 100644
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -73,6 +73,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
 	ZFS_AC_KERNEL_SRC_SETATTR_PREPARE
 	ZFS_AC_KERNEL_SRC_INSERT_INODE_LOCKED
 	ZFS_AC_KERNEL_SRC_DENTRY
+	ZFS_AC_KERNEL_SRC_DENTRY_ALIAS_D_U
 	ZFS_AC_KERNEL_SRC_TRUNCATE_SETSIZE
 	ZFS_AC_KERNEL_SRC_SECURITY_INODE
 	ZFS_AC_KERNEL_SRC_FS_CONTEXT
@@ -196,6 +197,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
 	ZFS_AC_KERNEL_SETATTR_PREPARE
 	ZFS_AC_KERNEL_INSERT_INODE_LOCKED
 	ZFS_AC_KERNEL_DENTRY
+	ZFS_AC_KERNEL_DENTRY_ALIAS_D_U
 	ZFS_AC_KERNEL_TRUNCATE_SETSIZE
 	ZFS_AC_KERNEL_SECURITY_INODE
 	ZFS_AC_KERNEL_FS_CONTEXT
diff --git a/include/os/linux/kernel/linux/dcache_compat.h b/include/os/linux/kernel/linux/dcache_compat.h
index f94dcda61..e27158926 100644
--- a/include/os/linux/kernel/linux/dcache_compat.h
+++ b/include/os/linux/kernel/linux/dcache_compat.h
@@ -32,7 +32,9 @@
 #define	dname(dentry)	((char *)((dentry)->d_name.name))
 #define	dlen(dentry)	((int)((dentry)->d_name.len))
 
+#ifdef HAVE_DENTRY_D_U_ALIASES
 #define	d_alias			d_u.d_alias
+#endif
 
 #ifdef HAVE_MM_PAGE_FLAGS_STRUCT
 /*