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Re: [PATCH v2 09/39] xen/riscv: implement virtual APLIC MMIO emulation
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, Baptiste Le Duc <baptiste.le-duc@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 4 Sep 2026 14:03:08 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Romain Caritey <Romain.Caritey@xxxxxxxxxxxxx>, Zheng Zhang <zhangzheng@xxxxxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>
- Delivery-date: Fri, 04 Sep 2026 12:03:15 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04.09.2026 13:58, Oleksii Kurochko wrote:
> On 9/2/26 1:51 PM, Baptiste Le Duc wrote:
>>> +uint32_t aplic_msi_target_gen(const struct vcpu *target_vcpu,
>>> + uint32_t base_val)
>>> +{
>>> + unsigned int guest_id = vcpu_guest_file_id(target_vcpu);
>>> + unsigned long hart_field = aplic_hart_field(target_vcpu->processor);
>> Nit: could be const
>
> Techically I agree. Then for guest_id it should const too, right?
>
> But it seems like Xen in such cases don't use const. Have you found a
> rule that we have to use const in such cases?
>
> I don't mind to put const here but then it would be nice if someone will
> tell me some kind of rule...
We want const on pointer targets whenever possible. We don't normally want
const on plain variables, unless it needs emphasizing that a variable is to
change value (which should be very rare).
Jan
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