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Re: [PATCH 2/3] misra: deviate MISRA C Rule 5.5 for 'request_irq'
- To: Dmytro Prokopchuk1 <dmytro_prokopchuk1@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 3 Jun 2026 10:00:18 +0200
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- Cc: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>, Doug Goldstein <cardoe@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 03 Jun 2026 08:00:28 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 25.05.2026 14:05, Dmytro Prokopchuk1 wrote:
> --- a/automation/eclair_analysis/ECLAIR/deviations.ecl
> +++ b/automation/eclair_analysis/ECLAIR/deviations.ecl
> @@ -138,6 +138,12 @@ hypfs nodes to allocate per-request traversal data with
> the correct size and ret
>
> -config=MC3A2.R5.5,ignored_macros+="name(hypfs_alloc_dyndata)&&loc(file(^xen/include/xen/hypfs\\.h$))"
> -doc_end
>
> +-doc_begin="Clash between 'request_irq' function and macro name in
> 'xen/drivers/passthrough/arm/smmu.c' is deliberate.
While I think "deliberate" is appropriate for the situation, ...
> --- a/docs/misra/deviations.rst
> +++ b/docs/misra/deviations.rst
> @@ -185,6 +185,13 @@ Deviations related to MISRA C:2012 Rules:
> function, so the name clash is controlled.
> - ECLAIR has been configured to ignore this macro.
>
> + * - R5.5
> + - Clash between the 'request_irq' function and macro name is
> intentional.
... imo "intentional" doesn't quite fit: I'm pretty sure we'd prefer to avoid
this,
but we want to keep the code imported from Linux as tidy of local changes as
possible.
> + The function uses the Xen 'request_irq()' argument order, while the
> macro
> + is a compatibility wrapper for the ARM SMMU driver that adapts calls
> by
> + reordering the handler and flags arguments.
Imo this restriction to one particular source file wants (somehow) expressing in
the very first sentence already, to avoid the impression that the clash would be
acceptable elsewhere as well.
Also, throughout: Please always append () to function (and function-like macro)
names. Right now you have a seemingly random mix.
Jan
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