Received-SPF: pass (google.com: domain of linux-kernel+bounces-112149-linux.lists.archive=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) client-ip=139.178.88.99;
Feedback-ID: iad51458e:Fastmail
Date: Fri, 22 Mar 2024 17:49:23 -0700
From: Boqun Feng <boqun.feng@gmail.com>
To: Kent Overstreet <kent.overstreet@linux.dev>
Cc: rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arch@vger.kernel.org, llvm@lists.linux.dev,
	Miguel Ojeda <ojeda@kernel.org>,	Alex Gaynor <alex.gaynor@gmail.com>,
	Wedson Almeida Filho <wedsonaf@gmail.com>,	Gary Guo <gary@garyguo.net>,
	=?iso-8859-1?Q?Bj=F6rn?= Roy Baron <bjorn3_gh@protonmail.com>,
	Benno Lossin <benno.lossin@proton.me>,
	Andreas Hindborg <a.hindborg@samsung.com>,
	Alice Ryhl <aliceryhl@google.com>,
	Alan Stern <stern@rowland.harvard.edu>,
	Andrea Parri <parri.andrea@gmail.com>,	Will Deacon <will@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Nicholas Piggin <npiggin@gmail.com>,	David Howells <dhowells@redhat.com>,
	Jade Alglave <j.alglave@ucl.ac.uk>,	Luc Maranget <luc.maranget@inria.fr>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Akira Yokosawa <akiyks@gmail.com>,	Daniel Lustig <dlustig@nvidia.com>,
	Joel Fernandes <joel@joelfernandes.org>,
	Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,	kent.overstreet@gmail.com,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>, elver@google.com,
	Mark Rutland <mark.rutland@arm.com>,
	Thomas Gleixner <tglx@linutronix.de>,	Ingo Molnar <mingo@redhat.com>,
 Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org,
	"H. Peter Anvin" <hpa@zytor.com>,
	Catalin Marinas <catalin.marinas@arm.com>,	torvalds@linux-foundation.org,
 linux-arm-kernel@lists.infradead.org,	linux-fsdevel@vger.kernel.org
Subject: Re: [WIP 0/3] Memory model and atomic API in Rust
Message-ID: <Zf4nE_AvHPx9F2nQ@boqun-archlinux>
References: <20240322233838.868874-1-boqun.feng@gmail.com>
 <s2jeqq22n5ef5jknaps37mfdjvuqrns4w7i22qp2r7r4bzjqs2@my3eyxoa3pl3>
 <Zf4fDJNBeRN5HOYo@boqun-archlinux>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <Zf4fDJNBeRN5HOYo@boqun-archlinux>

On Fri, Mar 22, 2024 at 05:15:08PM -0700, Boqun Feng wrote:
[...]
> > 
> > I wonder about that. The disadvantage of only supporting LKMM atomics is
> > that we'll be incompatible with third party code, and we don't want to
> > be rolling all of our own data structures forever.
> > 
> 
> A possible solution to that is a set of C++ memory model atomics
> implemented by LKMM atomics. That should be possible.
> 

Another possible "solution" works in the opposite direction, since the
folder rust/kernel/sync/atomic is quite stand-alone, we can export that
as a Rust crate (library), and third party code can support using LKMM
atomics instead of Rust own atomics ;-) Of course if the project is
supposed to work with Linux kernel.

Regards,
Boqun