From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-106113.protonmail.ch (mail-106113.protonmail.ch [79.135.106.113]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 793BE329C54; Fri, 29 May 2026 13:40:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=79.135.106.113 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780062024; cv=none; b=XJsEf/yb/ZEWWhbESJ4iLmkCRFeuvwqRu/3IK26D8Arzek2eVzYas1ybhqzMlYDFbQkSX0OdmDnuEbwzfPE6w8hZ7JW4eZiZmCMCTHemSzZjF8K3UCDVhxezS5Q7Fn634kEtUO74WjrAGye7cKqyWSqoNzWOKL7enkv7KOQu4Dc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780062024; c=relaxed/simple; bh=V76K5Gugw6gQcruCr4ZwRGVpHteVhlI7zrGVVaUh6c0=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=bgE428uiOU36gpna6wxxk68q6mJwhIlOjHpT+H6eolAjfvgRetDGHUuSB5uzZGp03D1avN8/z7FArnvqP43iewfR8wLg+I3JL0V6soZSHJo1FRtaMiUYI2z02j1K9cM5mHWXEDYxZt7GEWahiFkj6PHFQQ0qxY9mq5cpkrfiyiQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=onurozkan.dev; spf=pass smtp.mailfrom=onurozkan.dev; dkim=pass (2048-bit key) header.d=onurozkan.dev header.i=@onurozkan.dev header.b=OYYs7Z6j; arc=none smtp.client-ip=79.135.106.113 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=onurozkan.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=onurozkan.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=onurozkan.dev header.i=@onurozkan.dev header.b="OYYs7Z6j" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=onurozkan.dev; s=protonmail; t=1780062011; x=1780321211; bh=IOtnxQrp4YaiFhpRJRIKIPHnMA6NKedXJ2qcTsHdZiA=; h=From:To:Cc:Subject:Date:Message-ID:From:To:Cc:Date:Subject: Reply-To:Feedback-ID:Message-ID:BIMI-Selector; b=OYYs7Z6j+Fbsx08EbflZG40e9b1u3/NwDRlJXHQj8NJTZhaNc23qY/bBB3lQtZpHL O9o9w1LfXJ9u7o8VpUKs0tAB4Q+m2KNeXX/KqOzKWTeSxrT2ABiIlsnNhFRJHpvIOV Tdm6keqycPcY19Au3JswpqZuPWrJvBBZgFWLfRwtierRrged9YcBm03+rvL8s/ikpy s0S6utLNqPEoMQfwfZKxKIGvN4ZHddfVJyYWyuyyDyLbklfjwpVfU1oeGhcrL7TOLv +Lx3YULtRgndj+5Ql/7k+Rfp6OV/5WGSxTP3Pgmokv80qCOwQ9RKxlBz98f/Bp/wGg 0ZZZBqYFxEUew== X-Pm-Submission-Id: 4gRkxh0m33z1DDL0 From: =?UTF-8?q?Onur=20=C3=96zkan?= To: rcu@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org Cc: ojeda@kernel.org, boqun@kernel.org, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, a.hindborg@kernel.org, aliceryhl@google.com, tmgross@umich.edu, dakr@kernel.org, peterz@infradead.org, fujita.tomonori@gmail.com, tamird@kernel.org, jiangshanlai@gmail.com, paulmck@kernel.org, josh@joshtriplett.org, rostedt@goodmis.org, mathieu.desnoyers@efficios.com, =?UTF-8?q?Onur=20=C3=96zkan?= Subject: [PATCH v9 0/4] rust: add SRCU abstraction Date: Fri, 29 May 2026 16:39:50 +0300 Message-ID: <20260529134004.396743-1-work@onurozkan.dev> X-Mailer: git-send-email 2.51.2 Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The immediate motivation is the Tyr reset infrastructure [1] which needs to serialize reset sensitive hardware access against reset and teardown paths. That reset series started to require many independent dependencies so this SRCU support is split out as a standalone Rust API to keep the reset series focused on the reset logic and easier to review, rebase and land. Changes since v8: - Refactor srcu init handling to provide better init API (motivated by the "mutex.h" initializers. - Use warn_on! instead of pr_warn! on leaked guard detection. v8: https://lore.kernel.org/all/20260529114449.112066-1-work@onurozkan.dev Changes since v7: - Moved synchronize_srcu() call inside "if srcu_readers_active()" condition in "impl PinnedDrop for Srcu". - Improved comments on the synchronize_srcu() call in "impl PinnedDrop for Srcu". v7: https://lore.kernel.org/all/20260528062810.256212-1-work@onurozkan.dev Changes since v6: - Removed "CONFIG_DEBUG_LOCK_ALLOC" condition from "rust/helpers/srcu.c" and created a simple wrapper inside "include/linux/srcu.h" for it. v6: https://lore.kernel.org/all/20260527203615.163688-1-work@onurozkan.dev Changes since v5: - Created separate srcu_readers_active() variants for "srcutiny.h" and "srcutree.h". v5: https://lore.kernel.org/all/20260527174120.510447-1-work@onurozkan.dev Changes since v4: - Exposed srcu_readers_active from C side and wired it to the Rust helpers. - Used srcu_readers_active() in SRCU drop and logged with pr_warn if there are leaked guards during the drop. v4: https://lore.kernel.org/all/20260525175706.124910-1-work@onurozkan.dev Changes since v3 (which are for Sashiko notes [2]): - Added rust helpers for srcu_barrier() and synchronize_srcu_expedited() so the abstraction builds with CONFIG_TINY_SRCU, where these are static inline functions. - Added missing INVARIANT comment in Srcu::new() about why the type invariants hold after successful initialization. v3: https://lore.kernel.org/all/20260522054228.114814-1-work@onurozkan.dev Changes since v2: - Removed closure-based API. - Added #[doc(hidden)] on new_srcu macro. - Added #[must_use..] on srcu::Guard. - Improved the clean-up path (PinnedDrop implementation) which eventually made read_lock safe with leaked guards. v2: https://lore.kernel.org/all/20260502162833.34334-1-work@onurozkan.dev Changes since v1: - Made the owned SRCU read-side guard API unsafe and added a safe closure based helper for callers that do not need to keep the guard. This is to avoid UB on the C side cleanup_srcu_struct where the SRCU struct is freed while there are still active guards, which can happen if the caller leaks the guard e.g., with mem::forget(). - Improved doc comments. v1: https://lore.kernel.org/all/20260428103437.156236-1-work@onurozkan.dev [1]: https://lore.kernel.org/all/20260416171728.205141-1-work@onurozkan.dev [2]: https://sashiko.dev/#/patchset/20260522054228.114814-1-work@onurozkan.dev?part=2 Onur Özkan (4): rust: helpers: add SRCU helpers srcu: expose srcu_readers_active() rust: sync: add SRCU abstraction MAINTAINERS: add Rust SRCU files to SRCU entry MAINTAINERS | 3 + include/linux/srcu.h | 29 ++++--- include/linux/srcutiny.h | 13 +++ include/linux/srcutree.h | 24 ++++++ kernel/rcu/srcutiny.c | 12 +-- kernel/rcu/srcutree.c | 34 ++------ rust/helpers/helpers.c | 1 + rust/helpers/srcu.c | 35 ++++++++ rust/kernel/sync.rs | 2 + rust/kernel/sync/srcu.rs | 171 +++++++++++++++++++++++++++++++++++++++ 10 files changed, 280 insertions(+), 44 deletions(-) create mode 100644 rust/helpers/srcu.c create mode 100644 rust/kernel/sync/srcu.rs -- 2.51.2