[PATCH 17/20] headers: add __counted_by macro for kernels < 6.6

From: Yi Cong <[email protected]>

__counted_by() was introduced in v6.6 as a compiler attribute for
flexible array member bounds checking. Add a definition that expands
to the attribute when supported by the compiler, or to nothing
otherwise.

Signed-off-by: Yi Cong <[email protected]>
---
 backport/backport-include/linux/compiler_attributes.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/backport/backport-include/linux/compiler_attributes.h b/backport/backport-include/linux/compiler_attributes.h
index 31ddc163..b39b66b5 100644
--- a/backport/backport-include/linux/compiler_attributes.h
+++ b/backport/backport-include/linux/compiler_attributes.h
@@ -31,4 +31,12 @@
 #endif
 #endif /* fallthrough */
 
+#ifndef __counted_by
+#if __has_attribute(__counted_by__)
+# define __counted_by(member)		__attribute__((__counted_by__(member)))
+#else
+# define __counted_by(member)
+#endif
+#endif /* __counted_by */
+
 #endif /* _BACKPORTS_LINUX_COMPILER_ATTRIBUTES_H */
-- 
2.43.0