diff --git a/include/asm-ppc/md.h b/include/asm-ppc/md.h
new file mode 100644
index 0000000..9a9b6b4
--- /dev/null
+++ b/include/asm-ppc/md.h
@@ -0,0 +1,15 @@
+/*
+ * md.h: High speed xor_block operation for RAID4/5
+ *
+ */
+
+#ifdef __KERNEL__
+#ifndef __ASM_MD_H
+#define __ASM_MD_H
+
+/* #define HAVE_ARCH_XORBLOCK */
+
+#define MD_XORBLOCK_ALIGNMENT	sizeof(long)
+
+#endif /* __ASM_MD_H */
+#endif /* __KERNEL__ */