Re: [PATCH v2 9/9] rust: list: add ListArcField

[Benno Lossin]

On 06.05.24 11:53, Alice Ryhl wrote:
> One way to explain what `ListArc` does is that it controls exclusive
> access to the prev/next pointer field in a refcounted object. The
> feature of having a special reference to a refcounted object with
> exclusive access to specific fields is useful for other things, so
> provide a general utility for that.
> 
> This is used by Rust Binder to keep track of which processes have a
> reference to a given node. This involves an object for each process/node
> pair, that is referenced by both the process and the node. For some
> fields in this object, only the process's reference needs to access
> them (and it needs mutable access), so Binder uses a ListArc to give the
> process's reference exclusive access.
> 
> Signed-off-by: Alice Ryhl <aliceryhl@xxxxxxxxxx>
> ---
>  rust/kernel/list.rs           |  3 ++
>  rust/kernel/list/arc_field.rs | 96 +++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 99 insertions(+)

Reviewed-by: Benno Lossin <benno.lossin@xxxxxxxxx>

---
Cheers,
Benno