--- zzzz-none-000/linux-3.10.107/arch/x86/boot/string.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/x86/boot/string.c	2021-02-04 17:41:59.000000000 +0000
@@ -12,7 +12,16 @@
  * Very basic string functions
  */
 
-#include "boot.h"
+#include <linux/types.h>
+#include "ctype.h"
+
+int memcmp(const void *s1, const void *s2, size_t len)
+{
+	u8 diff;
+	asm("repe; cmpsb; setnz %0"
+	    : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
+	return diff;
+}
 
 int strcmp(const char *str1, const char *str2)
 {
@@ -21,7 +30,7 @@
 	int delta = 0;
 
 	while (*s1 || *s2) {
-		delta = *s2 - *s1;
+		delta = *s1 - *s2;
 		if (delta)
 			return delta;
 		s1++;