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Re: [PATCH 12/14] gnttab: don't cast away constness
- To: Roger Pau Monné <roger@xxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 6 Oct 2026 08:28:42 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>, 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, 06 Oct 2026 06:28:53 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 06.10.2026 07:59, Jan Beulich wrote:
> On 05.10.2026 18:59, Roger Pau Monné wrote:
>> On Wed, Sep 02, 2026 at 08:35:47AM +0200, Jan Beulich wrote:
>>> While _set_status_v2() indeed doesn't alter the grant_entry_header_t it
>>> is handed a pointer to, _set_status_v1() does. Drop the const from the
>>> parameter of the latter (and then necessarily also from _set_status()'s),
>>> while adding const to the local variable of the former.
>>>
>>> No functional change.
>>>
>>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>>
>> Acked-by: Roger Pau Monné <roger@xxxxxxxxxxxxxx>
>
> Thanks.
>
>> Could we also use a union in the functions themselves to avoid the cast?
>>
>> union {
>> const grant_entry_header_t *shah;
>> uint32_t *raw;
>> } grant = { .shah = shah };
>
> Possibly. However, irrespective of us using such all over the place, it
> still is - strictly speaking - UB.
Then again we already have union grant_combo, which may want leveraging here.
Jan
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