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Re: [XEN PATCH v2] x86: p2m-pod: address violation of MISRA C Rule 2.1
- To: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 1 Jul 2024 10:36:59 +0200
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- Cc: sstabellini@xxxxxxxxxx, michal.orzel@xxxxxxx, xenia.ragiadakou@xxxxxxx, ayan.kumar.halder@xxxxxxx, consulting@xxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 01 Jul 2024 08:37:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 28.06.2024 08:30, Nicola Vetrini wrote:
> The label 'out_unmap' is only reachable after ASSERT_UNREACHABLE,
> so the code below is only executed upon erroneously reaching that
> program point and calling domain_crash, thus resulting in the
> for loop after 'out_unmap' to become unreachable in some configurations.
First: As you have come to be used to, briefly stating the rule itself
(rather than just its number, requiring people like me - who have not
memorized all the rule numbers - to go look up what rule this is) would
be nice.
This being about unreachable code, why are the domain_crash() not the
crucial points of "unreachability"? And even if they weren't there, why
wouldn't it be the goto or ...
> --- a/xen/arch/x86/mm/p2m-pod.c
> +++ b/xen/arch/x86/mm/p2m-pod.c
> @@ -1040,6 +1040,7 @@ out_unmap:
> * Something went wrong, probably crashing the domain. Unmap
> * everything and return.
> */
> + /* SAF-8-safe Rule 2.1: defensive programming */
> for ( i = 0; i < count; i++ )
> if ( map[i] )
> unmap_domain_page(map[i]);
... the label (just out of context) where the comment needs to go?
Jan
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