Re: [PATCH v3] xen/public: fix flexible array definitions

[Julien Grall <julien@xxxxxxx>]

On 01/12/2023 11:20, Juergen Gross wrote:
> Flexible arrays in public headers can be problematic with some
> compilers.
>
> With XEN_FLEX_ARRAY_DIM there is a mechanism available to deal with
> this issue, but care must be taken to not change the affected structs
> in an incompatible way.
>
> So bump __XEN_LATEST_INTERFACE_VERSION__ and introduce a new macro
> XENPV_FLEX_ARRAY_DIM which will be XENPV_FLEX_ARRAY_DIM with the
> interface version being new enough and "1" (the value used today in
> the affected headers) when the interface version is an old one.
>
> Replace the arr[1] instances (this includes the ones seen to be
> problematic in recent Linux kernels [1]) with arr[XENPV_FLEX_ARRAY_DIM]
> in order to avoid compilation errors.
>
> [1]: https://bugzilla.kernel.org/show_bug.cgi?id=217693
>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Acked-by: Julien Grall <jgrall@xxxxxxxxxx>

Cheers,

--
Julien Grall