Macro check_arch_independent_layout 

macro_rules! check_arch_independent_layout {
    {} => { ... };
    {
        $type_name:ident {
            $( $($field:ident).+ ),*
            $(,)?
        }
        $($token:tt)*
    } => { ... };
}

Ensure a uapi type has the same layout in 32 and 64 bits.

Usage:

check_arch_independent_layout! {
    UapiType {
        field1,
        field2,
        ...
    }
}