linux-kernel - Re: [RFC 2/2] rust: sync: Add atomic support

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Date: Fri, 14 Jun 2024 18:24:53 -0700
From: Boqun Feng <boqun.feng@...il.com>
To: John Hubbard <jhubbard@...dia.com>
Cc: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
	Gary Guo <gary@...yguo.net>, rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	llvm@...ts.linux.dev, Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Wedson Almeida Filho <wedsonaf@...il.com>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Andreas Hindborg <a.hindborg@...sung.com>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Andrea Parri <parri.andrea@...il.com>,	Will Deacon <will@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Nicholas Piggin <npiggin@...il.com>,	David Howells <dhowells@...hat.com>,
	Jade Alglave <j.alglave@....ac.uk>,	Luc Maranget <luc.maranget@...ia.fr>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Akira Yokosawa <akiyks@...il.com>,	Daniel Lustig <dlustig@...dia.com>,
	Joel Fernandes <joel@...lfernandes.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,	kent.overstreet@...il.com,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, elver@...gle.com,
	Mark Rutland <mark.rutland@....com>,
	Thomas Gleixner <tglx@...utronix.de>,	Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Catalin Marinas <catalin.marinas@....com>,	torvalds@...ux-foundation.org,
 linux-arm-kernel@...ts.infradead.org,	linux-fsdevel@...r.kernel.org,
 Trevor Gross <tmgross@...ch.edu>,	dakr@...hat.com
Subject: Re: [RFC 2/2] rust: sync: Add atomic support

On Fri, Jun 14, 2024 at 06:03:37PM -0700, John Hubbard wrote:
> On 6/14/24 2:59 AM, Miguel Ojeda wrote:
> > On Thu, Jun 13, 2024 at 9:05 PM Boqun Feng <boqun.feng@...il.com> wrote:
> > > 
> > > Does this make sense?
> > 
> > Implementation-wise, if you think it is simpler or more clear/elegant
> > to have the extra lower level layer, then that sounds fine.
> > 
> > However, I was mainly talking about what we would eventually expose to
> > users, i.e. do we want to provide `Atomic<T>` to begin with? If yes,
> > then we could make the lower layer private already.
> > 
> > We can defer that extra layer/work if needed even if we go for
> > `Atomic<T>`, but it would be nice to understand if we have consensus
> > for an eventual user-facing API, or if someone has any other opinion
> > or concerns on one vs. the other.
> 
> Well, here's one:
> 
> The reason that we have things like atomic64_read() in the C code is
> because C doesn't have generics.
> 
> In Rust, we should simply move directly to Atomic<T>, as there are,
> after all, associated benefits. And it's very easy to see the connection

What are the associated benefits you are referring to? Rust std doesn't
use Atomic<T>, that somewhat proves that we don't need it.

Regards,
Boqun

> between the C types and the Atomic<T> types.
> 
> 
> thanks,
> -- 
> John Hubbard
> NVIDIA
>