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Re: [XEN PATCH] automation/eclair: add deviation for MISRA C:2012 Rule 16.3
- To: Federico Serafini <federico.serafini@xxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 19 Feb 2024 14:43:22 +0100
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- Cc: consulting@xxxxxxxxxxx, Simone Ballarin <simone.ballarin@xxxxxxxxxxx>, Doug Goldstein <cardoe@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 19 Feb 2024 13:43:31 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 19.02.2024 14:24, Federico Serafini wrote:
> Update ECLAIR configuration to consider safe switch clauses ending
> with __{get,put}_user_bad().
>
> Update docs/misra/deviations.rst accordingly.
>
> Signed-off-by: Federico Serafini <federico.serafini@xxxxxxxxxxx>
As mentioned I'm not happy with this, not the least because of it being
unclear why these two would be deviated, when there's no sign of a
similar deviation for, say, __bad_atomic_size(). Imo this approach
doesn't scale, and that's already leaving aside that the purpose of
identically named (pseudo-)helpers could differ between architectures,
thus putting under question ...
> --- a/automation/eclair_analysis/ECLAIR/deviations.ecl
> +++ b/automation/eclair_analysis/ECLAIR/deviations.ecl
> @@ -368,6 +368,10 @@ safe."
> -config=MC3R1.R16.3,reports+={safe,
> "any_area(end_loc(any_exp(text(/BUG\\(\\);/))))"}
> -doc_end
>
> +-doc_begin="Switch clauses ending with constructs \"__get_user_bad()\" and
> \"__put_user_bad()\" are safe: they denote an unreachable program point."
> +-config=MC3R1.R16.3,reports+={safe,
> "any_area(end_loc(any_exp(text(/__(put|get)_user_bad\\(\\);/))))"}
> +-doc_end
... the global scope of such a deviation. While it may not be a good idea,
even within an arch such (pseudo-)helpers could be used for multiple
distinct purposes.
Jan
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