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,
        ...
    }
}