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

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Date: Fri, 14 Jun 2024 21:22:24 +0000
From: Benno Lossin <benno.lossin@...ton.me>
To: Boqun Feng <boqun.feng@...il.com>, Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc: 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>, 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 14.06.24 16:33, Boqun Feng wrote:
> On Fri, Jun 14, 2024 at 11:59:58AM +0200, 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,
> 
> The truth is I don't know ;-) I don't have much data on which one is
> better. Personally, I think AtomicI32 and AtomicI64 make the users have
> to think about size, alignment, etc, and I think that's important for
> atomic users and people who review their code, because before one uses
> atomics, one should ask themselves: why don't I use a lock? Atomics
> provide the ablities to do low level stuffs and when doing low level
> stuffs, you want to be more explicit than ergonomic.

How would this be different with `Atomic<i32>` and `Atomic<i64>`? Just
because the underlying `Atomic<I>` type is generic shouldn't change
this, right?

---
Cheers,
Benno