linux-kernel - Re: [WIP 0/3] Memory model and atomic API in Rust

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Date: Wed, 27 Mar 2024 14:50:48 -0400
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: comex <comexk@...il.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>, 
	"Dr. David Alan Gilbert" <dave@...blig.org>, Philipp Stanner <pstanner@...hat.com>, 
	Boqun Feng <boqun.feng@...il.com>, rust-for-linux <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>, Gary Guo <gary@...yguo.net>, 
	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>, 
	Marco Elver <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>, linux-arm-kernel@...ts.infradead.org, 
	linux-fsdevel@...r.kernel.org
Subject: Re: [WIP 0/3] Memory model and atomic API in Rust

On Wed, Mar 27, 2024 at 09:16:09AM -0700, comex wrote:
> Meanwhile, Rust intentionally lacks strict aliasing.

I wasn't aware of this. Given that unrestricted pointers are a real
impediment to compiler optimization, I thought that with Rust we were
finally starting to nail down a concrete enough memory model to tackle
this safely. But I guess not?