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[kvmtool,v4,1/9] kvm tools: Add __DECLARE_FLEX_ARRAY() in include/linux/stddef.h

Message ID 20230712163501.1769737-2-apatel@ventanamicro.com (mailing list archive)
State New, archived
Headers show
Series RISC-V SBI enable/disable, Zbb, Zicboz, and Ssaia support | expand

Commit Message

Anup Patel July 12, 2023, 4:34 p.m. UTC 
Latest x86 UAPI headers uses __DECLARE_FLEX_ARRAY() macro so let us take
this macro from Linux UAPI header and add it to include/linux/stddef.h.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
---
 include/linux/stddef.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
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Patch

diff --git a/include/linux/stddef.h b/include/linux/stddef.h
index 39da808..d94e900 100644
--- a/include/linux/stddef.h
+++ b/include/linux/stddef.h
@@ -7,4 +7,20 @@ 
 #undef offsetof
 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 
+/**
+ * __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[]; \
+	}
+
 #endif