1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 #include <linux/compiler_types.h> 3 4 #ifndef __always_inline 5 #define __always_inline inline 6 #endif 7 8 /** 9 * __struct_group() - Create a mirrored named and anonyomous struct 10 * 11 * @TAG: The tag name for the named sub-struct (usually empty) 12 * @NAME: The identifier name of the mirrored sub-struct 13 * @ATTRS: Any struct attributes (usually empty) 14 * @MEMBERS: The member declarations for the mirrored structs 15 * 16 * Used to create an anonymous union of two structs with identical layout 17 * and size: one anonymous and one named. The former's members can be used 18 * normally without sub-struct naming, and the latter can be used to 19 * reason about the start, end, and size of the group of struct members. 20 * The named struct can also be explicitly tagged for layer reuse, as well 21 * as both having struct attributes appended. 22 */ 23 #define __struct_group(TAG, NAME, ATTRS, MEMBERS...) \ 24 union { \ 25 struct { MEMBERS } ATTRS; \ 26 struct TAG { MEMBERS } ATTRS NAME; \ 27 } 28