linux-kernel - [PATCH v8 0/6] rust: add ww

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Message-ID: <20251201102855.4413-1-work@onurozkan.dev>
Date: Mon,  1 Dec 2025 13:28:49 +0300
From: Onur Özkan <work@...rozkan.dev>
To: rust-for-linux@...r.kernel.org
Cc: lossin@...nel.org,
	lyude@...hat.com,
	ojeda@...nel.org,
	alex.gaynor@...il.com,
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	thomas.hellstrom@...ux.intel.com,
	linux-kernel@...r.kernel.org,
	Onur Özkan <work@...rozkan.dev>
Subject: [PATCH v8 0/6] rust: add ww_mutex support

I would like to request becoming a maintainer of this work.
If this is acceptable, please let me know so that I can add
myself to the MAINTAINERS file in the next revision.

See the changes of this version below.

Changes in v8:
  - Various minor updates (e.g., doc updates, removing unnecessary
    lifetime annotations, etc.).
  - Changed C implementation to always provide ww_class field in
    ww_mutex and ww_acquire_ctx types so we can access it from Rust
    easily.
  - Locking functions are now safe to call.
  - Added class validation logic to ww_mutex::lock_common.

Changes in v7:
  - Split Class and AcquireCtx into separate modules.
  - Removed "Ww" prefixes from type names.
  - Renamed exec.rs -> lock_set.rs and ExecContext -> LockSet.
  - Removed transmute logic from LockSet (formerly ExecContext).
  - Improved various doc-comments.
  - Marked certain AcquireCtx functions as unsafe.
  - Added from_raw constructors for Mutex, MutexGuard, AcquireCtx
    and Class.
  - LockSet::cleanup_on_deadlock no longer triggers reallocations when
    reinitializing AcquireCtx.
  - Incorporated various minor improvements suggested on the v6 series.

Changes in v6:
  - Added `unpinned_new` constructor for `WwClass` and updated
    global macros.
  - Changed all tests (and docs) to use Arc/KBox instead of
    `stack_pin_init` for `WwMutex` and `WwAcquireCtx`.
  - Added `LockKind` and `lock_common` helper to unify locking logic.
  - Added context-based and context-free locking functions for `WwMutex`.
  - Added `ww_mutex/exec` module, a high-level API with auto `EDEADLK`
    handling mechanism.

Changes in v5:
  - Addressed documentation review notes.
  - Removed `unwrap()`s in examples and KUnit tests.

Onur Özkan (6):
  rust: add C wrappers for ww_mutex inline functions
  ww_mutex: add `ww_class` field unconditionally
  rust: error: add EDEADLK
  rust: implement Class for ww_class support
  rust: ww_mutex: add Mutex, AcquireCtx and MutexGuard
  rust: ww_mutex: implement LockSet

 MAINTAINERS                                   |   1 +
 include/linux/ww_mutex.h                      |   8 +-
 rust/helpers/helpers.c                        |   1 +
 rust/helpers/ww_mutex.c                       |  39 ++
 rust/kernel/error.rs                          |   1 +
 rust/kernel/sync/lock.rs                      |   1 +
 rust/kernel/sync/lock/ww_mutex.rs             | 449 ++++++++++++++++++
 rust/kernel/sync/lock/ww_mutex/acquire_ctx.rs | 172 +++++++
 rust/kernel/sync/lock/ww_mutex/class.rs       | 156 ++++++
 rust/kernel/sync/lock/ww_mutex/lock_set.rs    | 383 +++++++++++++++
 10 files changed, 1205 insertions(+), 6 deletions(-)
 create mode 100644 rust/helpers/ww_mutex.c
 create mode 100644 rust/kernel/sync/lock/ww_mutex.rs
 create mode 100644 rust/kernel/sync/lock/ww_mutex/acquire_ctx.rs
 create mode 100644 rust/kernel/sync/lock/ww_mutex/class.rs
 create mode 100644 rust/kernel/sync/lock/ww_mutex/lock_set.rs

-- 
2.51.2