Re: [PATCH v3 2/2] rust: workqueue: add creation of workqueues

["Danilo Krummrich" <dakr@kernel.org>]

On Fri Feb 27, 2026 at 5:00 PM CET, Gary Guo wrote:
> On Fri Feb 27, 2026 at 3:30 PM GMT, Danilo Krummrich wrote:
>> On Fri Feb 27, 2026 at 3:53 PM CET, Alice Ryhl wrote:
>>> +    /// Set the maximum number of active cpus.
>>> +    ///
>>> +    /// If not set, a reasonable default value is used. The maximum value is `WQ_MAX_ACTIVE`.
>>
>> Should we just mention the default value?
>>
>>> +    #[inline]
>>> +    pub fn max_active(mut self, max_active: u32) -> Builder {
>>> +        self.max_active = i32::try_from(max_active).unwrap_or(i32::MAX);
>>
>> The workqueue code prints a warning for max_active >  WQ_MAX_ACTIVE. Maybe use
>> debug_assert()?
>>
>> It's also a bit unfortunate that alloc_ordered_workqueue() becomes
>> .max_active(1).
>
> I think ordered workqueue still to have __WQ_ORDERED flag, too?
>
>>
>> At the same time having a separate ordered() method competes with max_active().
>
> I don't think its too bad to have both, and before constructing checks that it's
> used correctly:
>
>     warn_on!(self.flags & __WQ_ORDERED != 0 && self.max_active != 1);
>
> but type state works, too.

I think we can ensure this at compile time, so we should do it.