/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

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#ifndef _LINUX_STDDEF_H

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#define _LINUX_STDDEF_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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* __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

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/*

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* __DECLARE_FLEX_ARRAY() - Declare a flexible array usable in a union

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*

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* @TYPE: The type of each flexible array element

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* @NAME: The name of the flexible array member

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*

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* In order to have a flexible array member in a union or alone in a

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* struct, it needs to be wrapped in an anonymous struct with at least 1

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* named member, but that member can be empty.

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*/

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#define __DECLARE_FLEX_ARRAY(TYPE, NAME) \

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struct { \

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struct { } __empty_ ## NAME; \

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TYPE NAME[]; \

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}

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