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Re: [XEN PATCH v3] x86: p2m-pod: address violation of MISRA C Rule 2.1
- To: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 10 Dec 2024 13:43:18 +0100
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- Cc: sstabellini@xxxxxxxxxx, michal.orzel@xxxxxxx, xenia.ragiadakou@xxxxxxx, ayan.kumar.halder@xxxxxxx, consulting@xxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 10 Dec 2024 12:43:24 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 10.12.2024 11:54, Nicola Vetrini wrote:
> Rule 2.1 states: "A project shall not contain unreachable code".
>
> The placement of the loop after "out_unmap" can be moved earlier
> in order to avoid the unconditional return to be marked as a cause of
> unreachability for the loop, as this is a consequence of
> "__builtin_unreachable" being configured in ECLAIR as being deliberately
> unreachable, and therefore not reported as causing the code after the
> "out_unmap" label to be unreachable.
>
> Replacing one instance of "goto out_unmap" with the loop avoids
> considering the unconditional return at the end of the function as a cause
> of unreachability, while preserving the semantics of the function.
>
> No functional change intended.
>
> Signed-off-by: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
with ...
> --- a/xen/arch/x86/mm/p2m-pod.c
> +++ b/xen/arch/x86/mm/p2m-pod.c
> @@ -1005,7 +1005,14 @@ p2m_pod_zero_check(struct p2m_domain *p2m, const gfn_t
> *gfns, unsigned int count
> {
> ASSERT_UNREACHABLE();
> domain_crash(d);
> - goto out_unmap;
> +out_unmap:
... the label indented by one or more blanks, as per ./CODING_STYLE.
Happy to adjust while committing.
Jan
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