v4.19.13 snapshot.
diff --git a/include/linux/raid/xor.h b/include/linux/raid/xor.h
new file mode 100644
index 0000000..2a9fee8
--- /dev/null
+++ b/include/linux/raid/xor.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _XOR_H
+#define _XOR_H
+
+#define MAX_XOR_BLOCKS 4
+
+extern void xor_blocks(unsigned int count, unsigned int bytes,
+ void *dest, void **srcs);
+
+struct xor_block_template {
+ struct xor_block_template *next;
+ const char *name;
+ int speed;
+ void (*do_2)(unsigned long, unsigned long *, unsigned long *);
+ void (*do_3)(unsigned long, unsigned long *, unsigned long *,
+ unsigned long *);
+ void (*do_4)(unsigned long, unsigned long *, unsigned long *,
+ unsigned long *, unsigned long *);
+ void (*do_5)(unsigned long, unsigned long *, unsigned long *,
+ unsigned long *, unsigned long *, unsigned long *);
+};
+
+#endif