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Re: [PATCH] misra: add deviation for MISRA C Rule R11.8.
- To: Alessandro Zucchelli <alessandro.zucchelli@xxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 17 Dec 2024 15:36:35 +0000
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- Cc: consulting@xxxxxxxxxxx, Simone Ballarin <simone.ballarin@xxxxxxxxxxx>, Doug Goldstein <cardoe@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>
- Delivery-date: Tue, 17 Dec 2024 15:36:48 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16/12/2024 4:57 pm, Alessandro Zucchelli wrote:
> Rule 11.8 states as following: "A cast shall not remove any `const' or
> `volatile' qualification from the type pointed to by a pointer".
>
> Function `__hvm_copy' in `xen/arch/x86/hvm/hvm.c' is a double-use
> function, where the parameter needs to not be const because it can be
> set for write or not. As it was decided a new const-only function will
> lead to more developer confusion than it is worth, this violation is
> addressed by deviating the function.
__hvm_copy() is a static function, and the public wrappers are const
where they ought to be.
No-one is expected to use __hvm_copy() directly.
All cases of casting away const-ness are accompanied with a comment
explaining why it's safe given the other flags passed in.
> diff --git a/automation/eclair_analysis/ECLAIR/deviations.ecl
> b/automation/eclair_analysis/ECLAIR/deviations.ecl
> index 2f58f29203..5056669f16 100644
> --- a/automation/eclair_analysis/ECLAIR/deviations.ecl
> +++ b/automation/eclair_analysis/ECLAIR/deviations.ecl
> @@ -393,6 +393,12 @@ Fixing this violation would require to increase code
> complexity and lower readab
>
> -config=MC3R1.R11.8,reports+={safe,"any_area(any_loc(any_exp(macro(^container_of$))))"}
> -doc_end
>
> +-doc_begin="Function __hvm_copy in xen/arch/x86/hvm/hvm.c is a double-use
> +function, where the parameter needs to not be const because it can be set for
> +writeor not"
"write or".
~Andrew
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