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-rw-r--r--include/linux/stddef.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/stddef.h b/include/linux/stddef.h
index 929d67710cc5..dab49e2ec8c0 100644
--- a/include/linux/stddef.h
+++ b/include/linux/stddef.h
@@ -93,4 +93,24 @@ enum {
#define DECLARE_FLEX_ARRAY(TYPE, NAME) \
__DECLARE_FLEX_ARRAY(TYPE, NAME)
+/**
+ * TRAILING_OVERLAP() - Overlap a flexible-array member with trailing members.
+ *
+ * Creates a union between a flexible-array member (FAM) in a struct and a set
+ * of additional members that would otherwise follow it.
+ *
+ * @TYPE: Flexible structure type name, including "struct" keyword.
+ * @NAME: Name for a variable to define.
+ * @FAM: The flexible-array member within @TYPE
+ * @MEMBERS: Trailing overlapping members.
+ */
+#define TRAILING_OVERLAP(TYPE, NAME, FAM, MEMBERS) \
+ union { \
+ TYPE NAME; \
+ struct { \
+ unsigned char __offset_to_##FAM[offsetof(TYPE, FAM)]; \
+ MEMBERS \
+ }; \
+ }
+
#endif