+#ifdef CONFIG_FS_XIP
+extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
+ loff_t *ppos);
+extern ssize_t xip_file_sendfile(struct file *in_file, loff_t *ppos,
+ size_t count, read_actor_t actor,
+ void *target);
+extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
+extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
+ size_t len, loff_t *ppos);
+extern int xip_truncate_page(struct address_space *mapping, loff_t from);
+#else
+static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
+{
+ return 0;
+}
+#endif
+