linux-kernel - Re: [PATCH RFC 02/20] rust_binder: add binderfs support to Rust binder

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Date:   Wed,  8 Nov 2023 10:25:21 +0000
From:   Alice Ryhl <aliceryhl@...gle.com>
To:     benno.lossin@...ton.me
Cc:     a.hindborg@...sung.com, alex.gaynor@...il.com,
        aliceryhl@...gle.com, arve@...roid.com, bjorn3_gh@...tonmail.com,
        boqun.feng@...il.com, brauner@...nel.org, cmllamas@...gle.com,
        gary@...yguo.net, gregkh@...uxfoundation.org, jeffv@...gle.com,
        joel@...lfernandes.org, linux-kernel@...r.kernel.org,
        maco@...roid.com, mattgilbride@...gle.com, mmaurer@...gle.com,
        ojeda@...nel.org, rust-for-linux@...r.kernel.org,
        surenb@...gle.com, tkjos@...roid.com, wedsonaf@...il.com
Subject: Re: [PATCH RFC 02/20] rust_binder: add binderfs support to Rust binder

Benno Lossin <benno.lossin@...ton.me> writes:
> On 01.11.23 19:01, Alice Ryhl wrote:
>> +/// There is one context per binder file (/dev/binder, /dev/hwbinder, etc)
>> +#[pin_data]
>> +pub(crate) struct Context {
>> +    #[pin]
>> +    manager: Mutex<Manager>,
>> +    pub(crate) name: CString,
>> +    #[pin]
>> +    links: ListLinks,
>> +}
>> +
>> +kernel::list::impl_has_list_links! {
>> +    impl HasListLinks<0> for Context { self.links }
>> +}
>> +kernel::list::impl_list_arc_safe! {
>> +    impl ListArcSafe<0> for Context { untracked; }
>> +}
>> +kernel::list::impl_list_item! {
>> +    impl ListItem<0> for Context {
>> +        using ListLinks;
>> +    }
>> +}
> 
> I think at some point it would be worth introducing a derive macro that
> does this for us. So for example:
> 
>     #[pin_data]
>     #[derive(HasListLinks)]
>     pub(crate) struct Context {
>         #[pin]
>         manager: Mutex<Manager>,
>         pub(crate) name: CString,
>         #[pin]
>         #[links]
>         links: ListLinks,
>     }

Sure, it would be nice to improve the ergonomics of this. However, I
don't think it's that important either. The current solution is a bit
verbose, but good enough for me.

Alice