~hc/RK356X_SDK_RELEASE.git

..	..	@@ -20,7 +20,7 @@
20	20	* Userspace note:
21	21	* The same principle works for userspace, because 'error' pointers
22	22	* fall down to the unused hole far from user space, as described
23		- * in Documentation/x86/x86_64/mm.txt for x86_64 arch:
	23	+ * in Documentation/x86/x86_64/mm.rst for x86_64 arch:
24	24	*
25	25	* 0000000000000000 - 00007fffffffffff (=47 bits) user space, different per mm hole caused by [48:63] sign extension
26	26	* ffffffffffe00000 - ffffffffffffffff (=2 MB) unused hole
..	..	@@ -52,4 +52,24 @@
52	52	return unlikely(!ptr) \|\| IS_ERR_VALUE((unsigned long)ptr);
53	53	}
54	54
	55	+static inline int __must_check PTR_ERR_OR_ZERO(__force const void *ptr)
	56	+{
	57	+ if (IS_ERR(ptr))
	58	+ return PTR_ERR(ptr);
	59	+ else
	60	+ return 0;
	61	+}
	62	+
	63	+/**
	64	+ * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
	65	+ * @ptr: The pointer to cast.
	66	+ *
	67	+ * Explicitly cast an error-valued pointer to another pointer type in such a
	68	+ * way as to make it clear that's what's going on.
	69	+ */
	70	+static inline void * __must_check ERR_CAST(__force const void *ptr)
	71	+{
	72	+ /* cast away the const */
	73	+ return (void *) ptr;
	74	+}
55	75	#endif /* _LINUX_ERR_H */