v4.19.13 snapshot.
diff --git a/arch/arm/lib/csumpartialcopy.S b/arch/arm/lib/csumpartialcopy.S
new file mode 100644
index 0000000..d03fc71
--- /dev/null
+++ b/arch/arm/lib/csumpartialcopy.S
@@ -0,0 +1,53 @@
+/*
+ * linux/arch/arm/lib/csumpartialcopy.S
+ *
+ * Copyright (C) 1995-1998 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+ .text
+
+/* Function: __u32 csum_partial_copy_nocheck(const char *src, char *dst, int len, __u32 sum)
+ * Params : r0 = src, r1 = dst, r2 = len, r3 = checksum
+ * Returns : r0 = new checksum
+ */
+
+ .macro save_regs
+ stmfd sp!, {r1, r4 - r8, lr}
+ .endm
+
+ .macro load_regs
+ ldmfd sp!, {r1, r4 - r8, pc}
+ .endm
+
+ .macro load1b, reg1
+ ldrb \reg1, [r0], #1
+ .endm
+
+ .macro load2b, reg1, reg2
+ ldrb \reg1, [r0], #1
+ ldrb \reg2, [r0], #1
+ .endm
+
+ .macro load1l, reg1
+ ldr \reg1, [r0], #4
+ .endm
+
+ .macro load2l, reg1, reg2
+ ldr \reg1, [r0], #4
+ ldr \reg2, [r0], #4
+ .endm
+
+ .macro load4l, reg1, reg2, reg3, reg4
+ ldmia r0!, {\reg1, \reg2, \reg3, \reg4}
+ .endm
+
+#define FN_ENTRY ENTRY(csum_partial_copy_nocheck)
+#define FN_EXIT ENDPROC(csum_partial_copy_nocheck)
+
+#include "csumpartialcopygeneric.S"