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Re: [PATCH 09/12] Eclair: deviate BUILD_ERROR() wrt rule 2.1 and introduce variants
- To: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 1 Sep 2026 08:36:06 +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>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>
- Delivery-date: Tue, 01 Sep 2026 06:36:14 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 29.08.2026 16:04, Nicola Vetrini wrote:
> On 2026-08-28 09:04, Jan Beulich wrote:
>> BUILD_ERROR() is even stronger a guard than assertions in general, and
>> ASSERT_UNREACHABLE() (or BUG()) in particular. Deviate it just like
>> those
>> to allow use for marking unreachable portions of code.
>>
>> In some cases code being unreachable is dependent upon configuration.
>> Introduce two variants, as constructs like
>>
>> if ( IS_ENABLED(CONFIG_...) )
>> BUILD_ERROR("...");
>>
>> results in the if() still being reported as unreachable. Sadly these
>> two
>> new macros introduce a new 20.12 violation each, which hence also needs
>> deviating.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> Reviewed-by: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
Thanks.
> Presumably you did not fold at least one of the following patches where
> the construct is actually used into this one to separate concerns?
Partly for that, partly to keep subsequent patches possible to go in
independently, i.e. in any order.
Jan
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