kernel_5.10 no rt

hc

2023-12-11 6778948f9de86c3cfaf36725a7c87dcff9ba247f

 kernel/include/uapi/linux/stddef.h
..
..
@@ -1,6 +1,31 @@
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 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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+#ifndef _UAPI_LINUX_STDDEF_H
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+#define _UAPI_LINUX_STDDEF_H
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+
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 #include <linux/compiler_types.h>
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 #ifndef __always_inline
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 #define __always_inline inline
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 #endif
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+
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+/**
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+ * __struct_group() - Create a mirrored named and anonyomous struct
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+ *
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+ * @TAG: The tag name for the named sub-struct (usually empty)
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+ * @NAME: The identifier name of the mirrored sub-struct
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+ * @ATTRS: Any struct attributes (usually empty)
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+ * @MEMBERS: The member declarations for the mirrored structs
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+ *
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+ * Used to create an anonymous union of two structs with identical layout
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+ * and size: one anonymous and one named. The former's members can be used
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+ * normally without sub-struct naming, and the latter can be used to
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+ * reason about the start, end, and size of the group of struct members.
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+ * The named struct can also be explicitly tagged for layer reuse, as well
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+ * as both having struct attributes appended.
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+ */
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+#define __struct_group(TAG, NAME, ATTRS, MEMBERS...) \
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+	union { \
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+		struct { MEMBERS } ATTRS; \
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+		struct TAG { MEMBERS } ATTRS NAME; \
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+	}
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+#endif