From: Alice Ryhl <aliceryhl@google.com>
To: Boqun Feng <boqun.feng@gmail.com>
Cc: linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org,
linux-fsdevel@vger.kernel.org, kasan-dev@googlegroups.com,
"Will Deacon" <will@kernel.org>,
"Peter Zijlstra" <peterz@infradead.org>,
"Mark Rutland" <mark.rutland@arm.com>,
"Gary Guo" <gary@garyguo.net>, "Miguel Ojeda" <ojeda@kernel.org>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Benno Lossin" <lossin@kernel.org>,
"Andreas Hindborg" <a.hindborg@kernel.org>,
"Trevor Gross" <tmgross@umich.edu>,
"Danilo Krummrich" <dakr@kernel.org>,
"Elle Rhumsaa" <elle@weathered-steel.dev>,
"Paul E. McKenney" <paulmck@kernel.org>,
"Marco Elver" <elver@google.com>,
"FUJITA Tomonori" <fujita.tomonori@gmail.com>
Subject: Re: [PATCH 1/2] rust: sync: atomic: Remove bound `T: Sync` for `Atomci::from_ptr()`
Date: Tue, 20 Jan 2026 12:39:13 +0000 [thread overview]
Message-ID: <aW93cQq0Cyd9ivpE@google.com> (raw)
In-Reply-To: <20260120115207.55318-2-boqun.feng@gmail.com>
On Tue, Jan 20, 2026 at 07:52:06PM +0800, Boqun Feng wrote:
> Originally, `Atomic::from_ptr()` requires `T` being a `Sync` because I
> thought having the ability to do `from_ptr()` meant multiplle
> `&Atomic<T>`s shared by different threads, which was identical (or
> similar) to multiple `&T`s shared by different threads. Hence `T` was
> required to be `Sync`. However this is not true, since `&Atomic<T>` is
> not the same at `&T`. Moreover, having this bound makes `Atomic::<*mut
> T>::from_ptr()` impossible, which is definitely not intended. Therefore
> remove the `T: Sync` bound.
>
> Fixes: 29c32c405e53 ("rust: sync: atomic: Add generic atomics")
> Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
there is a typo in patch title
next prev parent reply other threads:[~2026-01-20 12:39 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-20 11:52 [PATCH 0/2] Provide Rust atomic helpers over raw pointers Boqun Feng
2026-01-20 11:52 ` [PATCH 1/2] rust: sync: atomic: Remove bound `T: Sync` for `Atomci::from_ptr()` Boqun Feng
2026-01-20 12:38 ` Alice Ryhl
2026-01-20 12:39 ` Alice Ryhl [this message]
2026-01-20 13:09 ` Gary Guo
2026-01-20 11:52 ` [PATCH 2/2] rust: sync: atomic: Add atomic operation helpers over raw pointers Boqun Feng
2026-01-20 12:40 ` Alice Ryhl
2026-01-20 13:25 ` Gary Guo
2026-01-20 13:46 ` Boqun Feng
2026-01-20 16:23 ` Marco Elver
2026-01-20 16:47 ` Gary Guo
2026-01-20 17:10 ` Marco Elver
2026-01-20 17:32 ` Gary Guo
2026-01-20 20:52 ` Boqun Feng
2026-01-21 12:13 ` Marco Elver
2026-01-21 12:58 ` Boqun Feng
2026-01-21 13:09 ` Alice Ryhl
2026-01-21 12:19 ` Alice Ryhl
2026-01-21 12:36 ` Marco Elver
2026-01-21 12:51 ` Boqun Feng
2026-01-21 13:07 ` Alice Ryhl
2026-01-21 14:04 ` Boqun Feng
2026-01-21 13:42 ` Gary Guo
2026-01-20 17:12 ` Gary Guo
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=aW93cQq0Cyd9ivpE@google.com \
--to=aliceryhl@google.com \
--cc=a.hindborg@kernel.org \
--cc=bjorn3_gh@protonmail.com \
--cc=boqun.feng@gmail.com \
--cc=dakr@kernel.org \
--cc=elle@weathered-steel.dev \
--cc=elver@google.com \
--cc=fujita.tomonori@gmail.com \
--cc=gary@garyguo.net \
--cc=kasan-dev@googlegroups.com \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=lossin@kernel.org \
--cc=mark.rutland@arm.com \
--cc=ojeda@kernel.org \
--cc=paulmck@kernel.org \
--cc=peterz@infradead.org \
--cc=rust-for-linux@vger.kernel.org \
--cc=tmgross@umich.edu \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.