diff --git a/include/linux/err.h b/include/linux/err.h
index 1ab1d44..ec87f31 100644
--- a/include/linux/err.h
+++ b/include/linux/err.h
@@ -34,6 +34,19 @@
 	return IS_ERR_VALUE((unsigned long)ptr);
 }
 
+/**
+ * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
+ * @ptr: The pointer to cast.
+ *
+ * Explicitly cast an error-valued pointer to another pointer type in such a
+ * way as to make it clear that's what's going on.
+ */
+static inline void *ERR_CAST(const void *ptr)
+{
+	/* cast away the const */
+	return (void *) ptr;
+}
+
 #endif
 
 #endif /* _LINUX_ERR_H */