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Re: [XEN PATCH][for-4.19 v2 1/1] xen: introduce a deviation for Rule 11.9
- To: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: andrew.cooper3@xxxxxxxxxx
- Date: Thu, 12 Oct 2023 00:56:52 +0800
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- Cc: sstabellini@xxxxxxxxxx, michal.orzel@xxxxxxx, xenia.ragiadakou@xxxxxxx, ayan.kumar.halder@xxxxxxx, consulting@xxxxxxxxxxx, jbeulich@xxxxxxxx, roger.pau@xxxxxxxxxx, Simone Ballarin <simone.ballarin@xxxxxxxxxxx>, Doug Goldstein <cardoe@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Wed, 11 Oct 2023 16:57:10 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11/10/2023 8:46 pm, Nicola Vetrini wrote:
> diff --git a/docs/misra/deviations.rst b/docs/misra/deviations.rst
> index ee7aed0609d2..1b00e4e3e9b7 100644
> --- a/docs/misra/deviations.rst
> +++ b/docs/misra/deviations.rst
> @@ -199,6 +199,11 @@ Deviations related to MISRA C:2012 Rules:
> See automation/eclair_analysis/deviations.ecl for the full
> explanation.
> - Tagged as `safe` for ECLAIR.
>
> + * - R11.9
> + - __ACCESS_ONCE uses a 0 as a null pointer constant to check if a type
> is
> + scalar, therefore its usage for this purpose is allowed.
> + - Tagged as `deliberate` for ECLAIR.
Really?
#define __ACCESS_ONCE(x)
(void)(typeof(x))0; /* Scalar typecheck. */
That's not a pointer.
If someone were to pass in an x who's type was pointer-to-object, then
yes it is technically a NULL pointer constant for long enough for the
build to error out.
What justification is Eclair using to suggest that it is a pointer?
If you really really want to shut things up, it doesn't need to be 0 -
it could be 1 or any other integer, but this honestly feels like a bug
in Eclair to me.
~Andrew
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