1 files changed, 21 insertions, 0 deletions

diff --git a/arch/x86/lib/memmove_64.c b/arch/x86/lib/memmove_64.c
new file mode 100644
index 000000000000..751ebae8ec42
--- /dev/null
+++ b/arch/x86/lib/memmove_64.c
@@ -0,0 +1,21 @@
+/* Normally compiler builtins are used, but sometimes the compiler calls out
+   of line code. Based on asm-i386/string.h.
+ */
+#define _STRING_C
+#include <linux/string.h>
+#include <linux/module.h>
+
+#undef memmove
+void *memmove(void * dest,const void *src,size_t count)
+{
+        if (dest < src) { 
+                return memcpy(dest,src,count);
+        } else {
+                char *p = (char *) dest + count;
+                char *s = (char *) src + count;
+                while (count--)
+                        *--p = *--s;
+        }
+        return dest;
+} 
+EXPORT_SYMBOL(memmove);