[S390] Use alternative user-copy operations for new hardware.

This introduces new user-copy operations which are optimized for
copying more than 256 Bytes on new hardware.

Signed-off-by: Gerald Schaefer <geraldsc@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/include/asm-s390/uaccess.h b/include/asm-s390/uaccess.h
index 39a2716..e2047b0 100644
--- a/include/asm-s390/uaccess.h
+++ b/include/asm-s390/uaccess.h
@@ -100,6 +100,7 @@
 
 extern struct uaccess_ops uaccess;
 extern struct uaccess_ops uaccess_std;
+extern struct uaccess_ops uaccess_mvcos;
 
 static inline int __put_user_fn(size_t size, void __user *ptr, void *x)
 {