From: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
backport/backport-include/linux/stddef.h | 31 ++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/backport/backport-include/linux/stddef.h b/backport/backport-include/linux/stddef.h
index a6cdc67d2727..54afbd556467 100644
--- a/backport/backport-include/linux/stddef.h
+++ b/backport/backport-include/linux/stddef.h
@@ -23,4 +23,35 @@
(offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER))
#endif
+#ifndef DECLARE_FLEX_ARRAY
+/**
+ * __DECLARE_FLEX_ARRAY() - Declare a flexible array usable in a union
+ *
+ * @TYPE: The type of each flexible array element
+ * @NAME: The name of the flexible array member
+ *
+ * In order to have a flexible array member in a union or alone in a
+ * struct, it needs to be wrapped in an anonymous struct with at least 1
+ * named member, but that member can be empty.
++ */
+#define __DECLARE_FLEX_ARRAY(TYPE, NAME) \
+ struct { \
+ struct { } __empty_ ## NAME; \
+ TYPE NAME[]; \
+ }
+
+/**
+ * DECLARE_FLEX_ARRAY() - Declare a flexible array usable in a union
+ *
+ * @TYPE: The type of each flexible array element
+ * @NAME: The name of the flexible array member
+ *
+ * In order to have a flexible array member in a union or alone in a
+ * struct, it needs to be wrapped in an anonymous struct with at least 1
+ * named member, but that member can be empty.
+ */
+#define DECLARE_FLEX_ARRAY(TYPE, NAME) \
+ __DECLARE_FLEX_ARRAY(TYPE, NAME)
+#endif
+
#endif /* __BACKPORT_LINUX_STDDEF_H */
--
2.37.3
--
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