linux-kernel - Re: [PATCH v3 02/10] rust: list: add ListArc

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Message-ID: <CANiq72m4ufvpHwdLVaSZZsNoMxSCdwdRyAFM7recpy3soMozGA@mail.gmail.com>
Date: Tue, 6 Aug 2024 16:14:00 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Benno Lossin <benno.lossin@...ton.me>
Cc: Alice Ryhl <aliceryhl@...gle.com>, Miguel Ojeda <ojeda@...nel.org>, 
	Andrew Morton <akpm@...ux-foundation.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Wedson Almeida Filho <wedsonaf@...il.com>, Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Andreas Hindborg <a.hindborg@...sung.com>, Marco Elver <elver@...gle.com>, Coly Li <colyli@...e.de>, 
	Paolo Abeni <pabeni@...hat.com>, Pierre Gondois <pierre.gondois@....com>, 
	Ingo Molnar <mingo@...nel.org>, Jakub Kicinski <kuba@...nel.org>, Wei Yang <richard.weiyang@...il.com>, 
	Matthew Wilcox <willy@...radead.org>, linux-kernel@...r.kernel.org, 
	rust-for-linux@...r.kernel.org, Kees Cook <kees@...nel.org>
Subject: Re: [PATCH v3 02/10] rust: list: add ListArc

On Wed, Jul 31, 2024 at 6:47 PM Benno Lossin <benno.lossin@...ton.me> wrote:
>
> Can we start using `feature(derive_smart_pointer)` on new enough
> compiler versions? (I guess you probably want it as a separate patch
> series to avoid delaying this in case it needs anything [eg the new
> build system])
> Do we need any Makefile modifications for that or could we just do
> `#[cfg_attr(compiler-is-new-enough, derive(SmartPointer))` on the struct
> and then cfg these impls away? (and what would "compiler-is-new-enough"
> be?)

That is possible with the upcoming `RUSTC_VERSION`: you can have
Kconfig symbol for a particular version/feature/etc. Please see the
upcoming lints series for an example in the docs for that.

Cheers,
Miguel