linux-kernel - Re: [PATCH v2] rust: rbtree: add immutable cursor

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Message-ID: <e49f9e6c-69ee-4ec1-bcc8-3a60fda9a7be@nvidia.com>
Date: Wed, 10 Sep 2025 12:40:27 -0700
From: John Hubbard <jhubbard@...dia.com>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc: Danilo Krummrich <dakr@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>,
 Vitaly Wool <vitaly.wool@...sulko.se>, rust-for-linux@...r.kernel.org,
 linux-kernel@...r.kernel.org, Alex Gaynor <alex.gaynor@...il.com>,
 Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
 Bjorn Roy Baron <bjorn3_gh@...tonmail.com>, Benno Lossin
 <lossin@...nel.org>, Andreas Hindborg <a.hindborg@...nel.org>,
 Trevor Gross <tmgross@...ch.edu>, Onur Özkan
 <work@...rozkan.dev>
Subject: Re: [PATCH v2] rust: rbtree: add immutable cursor

On 9/9/25 7:50 PM, Miguel Ojeda wrote:
> On Wed, Sep 10, 2025 at 3:09 AM John Hubbard <jhubbard@...dia.com> wrote:
>>
>> Interesting. I know the topic of rustc minimum version (1.78 right now)
>> has been discussed a lot, but I'm somehow still confused about how this
>> works, on nova for example.
>>
>> The &raw feature requires rustc 1.82.0. So I thought we couldn't use
>> it. But clearly we can...right?
>>
>> So confused. Please help. :)
> 
> Please see what I have at this subpage:
> 
>      https://rust-for-linux.com/unstable-features
> 
> I hope that helps!
> 

Hi Miguel!

It leaves unanswered, the question of whether (and how) to use something
like the &raw feature, which requires Rust 1.82.0, given that the
stated min Rust version is 1.78.

Is there some sort of exception to the "min Rust version"? I haven't
figured out where that is written down.


thanks,
-- 
John Hubbard