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Re: [PATCH 7/7] gnttab: unreachable code when GNTTAB_MAX_VERSION < 2
- To: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 28 Jul 2026 17:42:03 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>
- Delivery-date: Tue, 28 Jul 2026 15:42:09 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 28.07.2026 17:40, Nicola Vetrini wrote:
> On 2026-07-28 15:53, Jan Beulich wrote:
>> I'm surprised Eclair doesn't spot the large chunks of unreachable code
>> on
>> Arm, i.e. violations of Misra C:2012 rule 2.1.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>> ---
>> This pretty certainly isn't dealing with everything. For example, with
>> another helper the gt_version field could likely also become
>> conditional.
>> With some more effort the nr_status_frames field similarly could become
>> conditional.
>>
> [...]
>
> Hard to judge only looking at the diff. Is this code unreachable in the
> arm64-allcode analysis configuration as well?
Arm uniformly has
#define GNTTAB_MAX_VERSION 1
so all gnttab-v2 code is unreachable there, no matter what configuration.
Jan
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