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Re: [XEN PATCH 3/4] x86: address violations of MISRA C Rule 8.4
- To: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 28 May 2024 08:28:11 +0200
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- Cc: sstabellini@xxxxxxxxxx, michal.orzel@xxxxxxx, xenia.ragiadakou@xxxxxxx, ayan.kumar.halder@xxxxxxx, consulting@xxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 28 May 2024 06:28:21 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 27.05.2024 16:53, Nicola Vetrini wrote:
> Rule 8.4 states: "A compatible declaration shall be visible when
> an object or function with external linkage is defined."
>
> These variables are only referenced from asm modules, so they
> need to be extern and there is negligible risk of them being
> used improperly without noticing.
"asm modules" isn't quite correct, as there's one use from inline
assembly. I have to admit I have no good wording suggestion other than
explicitly covering both: "asm modules or inline assembly". Yet that
then is ambiguous, as a use in inline assembly may also mean that
symbol is actually visible to the compiler by being mentioned as on of
the operands. Better ideas?
> As a result, they can be exempted using a comment-based deviation.
> No functional change.
>
> Signed-off-by: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
With suitably adjusted wording:
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Jan
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