linux-kernel - Re: [PATCH 2/2] rust: sync: arc: Add UniqueArc<MaybeUninit<T>::assume

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Date:   Fri, 24 Feb 2023 11:37:01 -0300
From:   Martin Rodriguez Reboredo <yakoyoku@...il.com>
To:     lina@...hilina.net
Cc:     alex.gaynor@...il.com, asahi@...ts.linux.dev,
        bjorn3_gh@...tonmail.com, boqun.feng@...il.com, gary@...yguo.net,
        linux-kernel@...r.kernel.org, ojeda@...nel.org,
        rust-for-linux@...r.kernel.org, wedsonaf@...il.com
Subject: Re: [PATCH 2/2] rust: sync: arc: Add UniqueArc<MaybeUninit<T>::assume_init()

On Fri, Feb 24, 2023 at 04:59:34PM +0900, Asahi Lina wrote:
> We can already create `UniqueArc<MaybeUninit<T>>` instances with
> `UniqueArc::try_new_uninit()` and write to them with `write()`. Add
> the missing unsafe `assume_init()` function to promote it to
> `UniqueArc<T>`, so users can do piece-wise initialization of the
> contents instead of doing it all at once as long as they keep the
> invariants (the same requirements as `MaybeUninit::assume_init()`).
> 
> This mirrors the std `Arc::assume_init()` function. In the kernel,
> since we have `UniqueArc`, arguably this only belongs there since most
> use cases will initialize it immediately after creating it, before
> demoting it to `Arc` to share it.

Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@...il.com>