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Re: [PATCH v2] xen/public: fix flexible array definitions
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Thu, 30 Nov 2023 14:28:44 +0100
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- Cc: George Dunlap <george.dunlap@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Thu, 30 Nov 2023 13:28:51 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 30.11.23 12:34, Andrew Cooper wrote:
On 30/11/2023 9:21 am, 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>
CHANGELOG please. This change, however it ends up looking, absolutely
needs covering.
Would this be fine:
### Changed
+ - Changed flexible array definitions in public I/O interface headers to not
+ use "1" as the number of array elements.
Juergen
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