From: Peter Zijlstra <peterz@infradead.org>
To: Andreas Hindborg <a.hindborg@kernel.org>
Cc: "Alice Ryhl" <aliceryhl@google.com>,
"Lorenzo Stoakes" <lorenzo.stoakes@oracle.com>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
"Miguel Ojeda" <ojeda@kernel.org>,
"Boqun Feng" <boqun.feng@gmail.com>,
"Gary Guo" <gary@garyguo.net>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Benno Lossin" <lossin@kernel.org>,
"Trevor Gross" <tmgross@umich.edu>,
"Danilo Krummrich" <dakr@kernel.org>,
"Will Deacon" <will@kernel.org>,
"Mark Rutland" <mark.rutland@arm.com>,
linux-mm@kvack.org, rust-for-linux@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] rust: page: add byte-wise atomic memory copy methods
Date: Fri, 13 Feb 2026 10:55:57 +0100 [thread overview]
Message-ID: <20260213095557.GS2995752@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <20260212-page-volatile-io-v2-1-a36cb97d15c2@kernel.org>
On Thu, Feb 12, 2026 at 03:51:24PM +0100, Andreas Hindborg wrote:
> When copying data from buffers that are mapped to user space, it is
> impossible to guarantee absence of concurrent memory operations on those
> buffers. Copying data to/from `Page` from/to these buffers would be
> undefined behavior if no special considerations are made.
>
> Add methods on `Page` to read and write the contents using byte-wise atomic
> operations.
I'm completely failing to understand. What!?
There is no such thing as an 'atomic' byte load, nor does it help one
whit against concurrent modification of the memory you're copying.
next prev parent reply other threads:[~2026-02-13 9:56 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-12 14:51 Andreas Hindborg
2026-02-12 16:41 ` Boqun Feng
2026-02-12 17:10 ` Andreas Hindborg
2026-02-12 17:23 ` Andreas Hindborg
2026-02-13 9:55 ` Peter Zijlstra [this message]
2026-02-13 12:18 ` Greg KH
2026-02-13 12:58 ` Andreas Hindborg
2026-02-13 13:20 ` Greg KH
2026-02-13 14:13 ` Andreas Hindborg
2026-02-13 14:26 ` Peter Zijlstra
2026-02-13 15:34 ` Greg KH
2026-02-13 15:45 ` Boqun Feng
2026-02-13 15:58 ` Greg KH
2026-02-13 16:19 ` Boqun Feng
2026-02-17 9:13 ` Peter Zijlstra
2026-02-17 9:33 ` Alice Ryhl
2026-02-17 9:45 ` Peter Zijlstra
2026-02-17 10:01 ` Alice Ryhl
2026-02-17 10:25 ` Peter Zijlstra
2026-02-17 10:47 ` Alice Ryhl
2026-02-17 11:09 ` Peter Zijlstra
2026-02-17 11:51 ` Alice Ryhl
2026-02-17 12:09 ` Peter Zijlstra
2026-02-17 13:00 ` Peter Zijlstra
2026-02-17 13:54 ` Danilo Krummrich
2026-02-17 15:50 ` Peter Zijlstra
2026-02-17 16:10 ` Danilo Krummrich
2026-02-17 13:09 ` Alice Ryhl
2026-02-17 15:48 ` Peter Zijlstra
2026-02-17 23:39 ` Gary Guo
2026-02-18 8:37 ` Peter Zijlstra
2026-02-18 9:31 ` Alice Ryhl
2026-02-18 10:09 ` Peter Zijlstra
2026-02-17 13:56 ` Andreas Hindborg
2026-02-17 16:04 ` Peter Zijlstra
2026-02-17 18:43 ` Andreas Hindborg
2026-02-17 20:32 ` Jens Axboe
2026-02-17 15:52 ` Boqun Feng
2026-02-17 9:17 ` Peter Zijlstra
2026-02-17 9:23 ` Peter Zijlstra
2026-02-17 9:37 ` Alice Ryhl
2026-02-17 10:01 ` Peter Zijlstra
2026-02-17 9:33 ` Peter Zijlstra
2026-02-14 0:07 ` Gary Guo
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