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Re: [XEN PATCH v2] automation/eclair_analysis: deviate linker symbols for Rule 18.2
- To: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 9 Sep 2024 11:59:11 +0200
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- Cc: sstabellini@xxxxxxxxxx, michal.orzel@xxxxxxx, xenia.ragiadakou@xxxxxxx, ayan.kumar.halder@xxxxxxx, consulting@xxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 09 Sep 2024 09:59:19 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 07.09.2024 15:03, Nicola Vetrini wrote:
> --- a/docs/misra/deviations.rst
> +++ b/docs/misra/deviations.rst
> @@ -501,6 +501,16 @@ Deviations related to MISRA C:2012 Rules:
> - __builtin_memset()
> - cpumask_check()
>
> + * - R18.2
> + - Subtractions between pointers where at least one of the operand is a
> + pointer to a symbol defined by the linker are safe.
Imo there should be "deemed" in there, as such subtractions aren't
necessarily safe. We've merely settled on considering the risk as
acceptable, iirc.
> + - Tagged as `safe` for ECLAIR.
> +
> + * - R18.2
> + - Subtraction between pointers encapsulated by macro page_to_mfn
> + are safe.
> + - Tagged as `safe` for ECLAIR.
This one is a result of using frame_table[], aiui. Alternative approaches
were discussed before. Did that not lead anywhere, requiring a purely
textual / configurational deviation?
Jan
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