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Re: [PATCH] misra: add deviation of Rule 2.1 for BUG() macro
- To: Dmytro Prokopchuk1 <dmytro_prokopchuk1@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 25 Aug 2025 12:07:14 +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: Mon, 25 Aug 2025 10:07:31 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 24.08.2025 16:56, Dmytro Prokopchuk1 wrote:
> --- a/docs/misra/deviations.rst
> +++ b/docs/misra/deviations.rst
> @@ -97,6 +97,19 @@ Deviations related to MISRA C:2012 Rules:
> Xen expects developers to ensure code remains safe and reliable in
> builds,
> even when debug-only assertions like `ASSERT_UNREACHABLE() are
> removed.
>
> + * - R2.1
> + - The 'BUG()' macro is intentionally used in the 'prepare_acpi()'
> function
> + in specific build configuration (when the config CONFIG_ACPI is not
> + defined) to trigger an error if ACPI-related features are used
> incorrectly.
> + - Tagged as `deliberate` for ECLAIR.
With
#define acpi_disabled true
in xen/acpi.h I don't see why we even have that inline stub. When it's dropped
and the declaration left in place without #ifdef CONFIG_ACPI around it, the
compiler will DCE the code (much like we arrange for in many other places). No
deviation needed then.
If such a deviation was to be added, it would need disambiguating. A function
of the given name could appear in x86 as well. That wouldn't be covered by the
Eclair config then, but it would be covered by the text here.
> + * - R2.1
> + - The 'BUG()' macro is intentionally used in 'gicv3_do_LPI'() and
> + 'gicv3_its_setup_collection()' functions in specific build
> configuration
> + (when the config CONFIG_HAS_ITS is not defined) to catch and prevent
> any
> + unintended execution of code that should only run when ITS is
> available.
> + - Tagged as `deliberate` for ECLAIR.
I didn't look at this, but I would very much hope that something similar could
be done there as well.
Jan
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