linux-kernel - Re: [PATCH v2 3/5] rust: percpu: add a rust per-CPU variable test

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Message-ID: <aHfGvmq3zFWL6Hbe@Mac.home>
Date: Wed, 16 Jul 2025 08:35:26 -0700
From: Boqun Feng <boqun.feng@...il.com>
To: Benno Lossin <lossin@...nel.org>
Cc: Mitchell Levy <levymitchell0@...il.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
	Christoph Lameter <cl@...ux.com>,
	Danilo Krummrich <dakr@...nel.org>, linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v2 3/5] rust: percpu: add a rust per-CPU variable test

On Tue, Jul 15, 2025 at 07:44:01PM +0200, Benno Lossin wrote:
[...]
> >> 
> >> Sure we can do some experimentation, but I don't think we should put
> >> unsafe abstractions upstream that we intend to replace with a safe
> >> abstraction later. Otherwise people are going to depend on it and it's
> >
> > I doubt we can replace the unsafe abstraction with a safe one, if users
> > really care the performance then they would really need to use some
> > unsafe API to build their safe abstraction.
> 
> That sounds pretty pessimistic, why do you think that?
> 

I could ask you the similar, you barely know the implementation and
usage the percpu, why do you think it's possible? ;-)

Regards,
Boqun