Re: [PATCH v3 4/4] rust: devres: implement register_release()

["Benno Lossin" <lossin@kernel.org>]

On Thu Jun 26, 2025 at 1:15 PM CEST, Danilo Krummrich wrote:
> On Thu, Jun 26, 2025 at 12:36:23PM +0200, Benno Lossin wrote:
>> Or, we could change `Release` to be:
>> 
>>     pub trait Release {
>>         type Ptr: ForeignOwnable;
>> 
>>         fn release(this: Self::Ptr);
>>     }
>> 
>> and then `register_release` is:
>> 
>>     pub fn register_release<T: Release>(dev: &Device<Bound>, data: T::Ptr) -> Result
>> 
>> This way, one can store a `Box<T>` and get access to the `T` at the end.
>
> I think this was also the case before? Well, it was P::Borrowed instead.

Well you had access to a `&T`, but not the `T` directly.

>> Related questions:
>> 
>> * should we implement `ForeignOwnable` for `&'static T`?
>
> There's already a patch on the list doing this in the context of DebugFS [1].
>
> [1] https://lore.kernel.org/lkml/20250624-debugfs-rust-v7-3-9c8835a7a20f@google.com/

Ah, I'm not following that series at the moment.

---
Cheers,
Benno