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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2025-10-12 14:08:35 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2025-10-12 14:08:35 +0300
commit4a12f38e23d10a5dbad6cce0abaadd10e5a1aa68 (patch)
tree533208f5479c17b9a7c162a425a967c7a7edf46b /include/linux/stddef.h
parent0d2f2f4f27694a2214701e7482ab7599ce4e5e77 (diff)
parent449d48b1b99fdaa076166e200132705ac2bee711 (diff)
downloadlinux-rolling-stable.tar.xz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/stddef.h')
-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