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Re: [PATCH] x86/DMI: adjustments to comply with Misra C:2012 Rule 9.3
- To: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 4 Dec 2023 13:12:15 +0100
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 04 Dec 2023 12:12:31 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04.12.2023 12:52, Nicola Vetrini wrote:
> On 2023-11-30 15:56, Jan Beulich wrote:
>> On 30.11.2023 08:55, Jan Beulich wrote:
>>> The rule demands that all array elements be initialized (or dedicated
>>> initializers be used). Introduce a small set of macros to allow doing
>>> so
>>> without unduly affecting use sites (in particular in terms of how many
>>> elements .matches[] actually has; right now there's no use of
>>> DMI_MATCH4(), so we could even consider reducing the array size to 3).
>>>
>>> Note that DMI_MATCH() needs adjustment because of the comma included
>>> in
>>> its expansion, which - due to being unparenthesized - would otherwise
>>> cause macro arguments in the "further replacement" step to be wrong.
>>
>> Sadly this doesn't work with older gcc (4.8.5 is what I had an issue
>> with,
>> complaining "initializer element is not constant").
>
> I tried plugging the relevant code into godbolt.org to try gcc-4.8.5,
> but I'm not able to reproduce the error (see
> https://godbolt.org/z/cP88YeWhh). Can you please provide some more
> details on where the issue is?
It apparently doesn't like the compound literal as initializer. I need
to re-submit the adjusted patch, though.
Jan
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