linux-kernel - Re: [GIT PULL] locking changes for v6.18

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Message-ID: <aNa3YrzdrcXM0bhM@tardis.local>
Date: Fri, 26 Sep 2025 08:55:14 -0700
From: Boqun Feng <boqun.feng@...il.com>
To: Ingo Molnar <mingo@...nel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>, Will Deacon <will@...nel.org>,
	Waiman Long <longman@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Uros Bizjak <ubizjak@...il.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Gary Guo <gary@...yguo.net>
Subject: Re: [GIT PULL] locking changes for v6.18

On Fri, Sep 26, 2025 at 04:45:25PM +0200, Ingo Molnar wrote:
> Linus,
> 

Hi Ingo,

The commits in the pull request look good to me, however I find the
description has some problems.

> Please pull the latest locking/core Git tree from:
> 
>    git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking-core-2025-09-26
> 
>    # HEAD: 17d9f8eaa87d40a2ff66598875a43363e37a909b MAINTAINERS: update atomic infrastructure entry to include Rust
> 
> Locking updates for v6.16 mostly include Rust runtime enhancements:
> 

This should be v6.18, right?

>  - Add initial support for generic LKMM atomic variables in Rust. (Boqun Feng)
>  - Add the wrapper for `refcount_t` in Rust. (Gary Guo)
>  - Make `data` in `Lock` structurally pinned. (Daniel Almeida)

This part is not in the pull request. I had two pull requests to tip
tree this cycle:

* For atomics: https://lore.kernel.org/rust-for-linux/20250905044141.77868-1-boqun.feng@gmail.com/
* For locking: https://lore.kernel.org/rust-for-linux/20250919091241.32138-1-boqun.feng@gmail.com/

The second one contains the part you mentioned above, but it's never
been merged into tip tree, so it doesn't exist in tag
locking-core-2025-09-26.

Regards,
Boqun

>  - Add a new reviewer, Gary Guo.
> 
>  Thanks,
> 
> 	Ingo
> 
> ------------------>
> Boqun Feng (9):
>       rust: Introduce atomic API helpers
>       rust: sync: Add basic atomic operation mapping framework
>       rust: sync: atomic: Add ordering annotation types
>       rust: sync: atomic: Add generic atomics
>       rust: sync: atomic: Add atomic {cmp,}xchg operations
>       rust: sync: atomic: Add the framework of arithmetic operations
>       rust: sync: atomic: Add Atomic<u{32,64}>
>       rust: sync: atomic: Add Atomic<{usize,isize}>
>       rust: sync: Add memory barriers
> 
> Gary Guo (5):
>       rust: implement `kernel::sync::Refcount`
>       rust: make `Arc::into_unique_or_drop` associated function
>       rust: convert `Arc` to use `Refcount`
>       rust: block: convert `block::mq` to use `Refcount`
>       MAINTAINERS: update atomic infrastructure entry to include Rust
> 
> 
>  MAINTAINERS                               |    6 +-
>  rust/helpers/atomic.c                     | 1040 +++++++++++++++++++++++++++++
>  rust/helpers/barrier.c                    |   18 +
>  rust/helpers/helpers.c                    |    2 +
>  rust/helpers/refcount.c                   |   10 +
>  rust/kernel/block/mq/operations.rs        |    7 +-
>  rust/kernel/block/mq/request.rs           |   73 +-
>  rust/kernel/sync.rs                       |    4 +
>  rust/kernel/sync/arc.rs                   |   55 +-
>  rust/kernel/sync/atomic.rs                |  551 +++++++++++++++
>  rust/kernel/sync/atomic/internal.rs       |  265 ++++++++
>  rust/kernel/sync/atomic/ordering.rs       |  104 +++
>  rust/kernel/sync/atomic/predefine.rs      |  169 +++++
>  rust/kernel/sync/barrier.rs               |   61 ++
>  rust/kernel/sync/refcount.rs              |  113 ++++
>  scripts/atomic/gen-atomics.sh             |    1 +
>  scripts/atomic/gen-rust-atomic-helpers.sh |   67 ++
>  17 files changed, 2454 insertions(+), 92 deletions(-)
>  create mode 100644 rust/helpers/atomic.c
>  create mode 100644 rust/helpers/barrier.c
>  create mode 100644 rust/kernel/sync/atomic.rs
>  create mode 100644 rust/kernel/sync/atomic/internal.rs
>  create mode 100644 rust/kernel/sync/atomic/ordering.rs
>  create mode 100644 rust/kernel/sync/atomic/predefine.rs
>  create mode 100644 rust/kernel/sync/barrier.rs
>  create mode 100644 rust/kernel/sync/refcount.rs
>  create mode 100755 scripts/atomic/gen-rust-atomic-helpers.sh