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From: "Benno Lossin" <lossin@kernel.org>
To: "Boqun Feng" <boqun.feng@gmail.com>
Cc: linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org,
	lkmm@lists.linux.dev, linux-arch@vger.kernel.org,
	"Miguel Ojeda" <ojeda@kernel.org>,
	"Alex Gaynor" <alex.gaynor@gmail.com>,
	"Gary Guo" <gary@garyguo.net>,
	"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
	"Andreas Hindborg" <a.hindborg@kernel.org>,
	"Alice Ryhl" <aliceryhl@google.com>,
	"Trevor Gross" <tmgross@umich.edu>,
	"Danilo Krummrich" <dakr@kernel.org>,
	"Will Deacon" <will@kernel.org>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Mark Rutland" <mark.rutland@arm.com>,
	"Wedson Almeida Filho" <wedsonaf@gmail.com>,
	"Viresh Kumar" <viresh.kumar@linaro.org>,
	"Lyude Paul" <lyude@redhat.com>, "Ingo Molnar" <mingo@kernel.org>,
	"Mitchell Levy" <levymitchell0@gmail.com>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Linus Torvalds" <torvalds@linux-foundation.org>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Alan Stern" <stern@rowland.harvard.edu>
Subject: Re: [PATCH v8 6/9] rust: sync: atomic: Add the framework of arithmetic operations
Date: Sat, 16 Aug 2025 21:35:26 +0200	[thread overview]
Message-ID: <DC43RPUDBY6M.1TGSQKJV9BKSF@kernel.org> (raw)
In-Reply-To: <aKCtbSDuJNrtdLNp@tardis-2.local>

On Sat Aug 16, 2025 at 6:10 PM CEST, Boqun Feng wrote:
> On Tue, Aug 12, 2025 at 10:04:12AM +0200, Benno Lossin wrote:
>> On Sat Jul 19, 2025 at 5:08 AM CEST, Boqun Feng wrote:
>> > +/// Types that support atomic add operations.
>> > +///
>> > +/// # Safety
>> > +///
>> > +/// `wrapping_add` any value of type `Self::Repr::Delta` obtained by [`Self::rhs_into_delta()`] to
>> 
>> Can you add a normal comment TODO here:
>> 
>>     // TODO: properly define `wrapping_add` in this context.
>
> Yeah, this sounds good to me. How do you propose we arrange the normal
> comment with the doc comment, somthing like:
>
>     // TODO: properly define `wrapping_add` in this context.
>     
>     /// Types that support atomic add operations.
>     ///
>     /// # Safety
>     ///
>     /// `wrapping_add` any value of type `Self::Repr::Delta` obtained by [`Self::rhs_into_delta()`] to
>     ...
>     pub unsafe trait AtomicAdd<...> {
>         ...
>     }


Inline maybe?

    /// Types that support atomic add operations.
    ///
    /// # Safety
    ///
    // TODO: properly define `wrapping_add` in this context:
    /// `wrapping_add` any value of type `Self::Repr::Delta` obtained by [`Self::rhs_into_delta()`] to
    /// any value of type `Self::Repr` obtained through transmuting a value of type `Self` to must
    /// yield a value with a bit pattern also valid for `Self`.

---
Cheers,
Benno

  reply	other threads:[~2025-08-16 19:35 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-07-19  3:08 [PATCH v8 0/9] LKMM atomics in Rust Boqun Feng
2025-07-19  3:08 ` [PATCH v8 1/9] rust: Introduce atomic API helpers Boqun Feng
2025-07-19  3:08 ` [PATCH v8 2/9] rust: sync: Add basic atomic operation mapping framework Boqun Feng
2025-07-19  3:08 ` [PATCH v8 3/9] rust: sync: atomic: Add ordering annotation types Boqun Feng
2025-08-12  7:52   ` Benno Lossin
2025-07-19  3:08 ` [PATCH v8 4/9] rust: sync: atomic: Add generic atomics Boqun Feng
2025-08-12  7:59   ` Benno Lossin
2025-08-16 16:11     ` Boqun Feng
2025-07-19  3:08 ` [PATCH v8 5/9] rust: sync: atomic: Add atomic {cmp,}xchg operations Boqun Feng
2025-07-19  3:08 ` [PATCH v8 6/9] rust: sync: atomic: Add the framework of arithmetic operations Boqun Feng
2025-08-12  8:04   ` Benno Lossin
2025-08-16 16:10     ` Boqun Feng
2025-08-16 19:35       ` Benno Lossin [this message]
2025-08-17  3:04         ` Boqun Feng
2025-08-18 22:49           ` Benno Lossin
2025-07-19  3:08 ` [PATCH v8 7/9] rust: sync: atomic: Add Atomic<u{32,64}> Boqun Feng
2025-07-19  3:08 ` [PATCH v8 8/9] rust: sync: atomic: Add Atomic<{usize,isize}> Boqun Feng
2025-07-19  3:08 ` [PATCH v8 9/9] rust: sync: Add memory barriers Boqun Feng

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