From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-244107.protonmail.ch (mail-244107.protonmail.ch [109.224.244.107]) (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 336A23DC4A4 for ; Fri, 29 May 2026 11:45:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=109.224.244.107 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780055109; cv=none; b=qcNn0w2wRCrDewJ7IiQpqMOSfq6XRTJQX7DASNCjWU+D4ZdXIVCjs2ts42hr/3JlcQTOqEIymP4IE8pcA+K7RzhAelQC6yLtQ/NvIgGLOM7hmkCN2B49nF+dfWw7nwvV1aTp6+g7NJiUwS017la12s2dqZ+R7lycHiLGkyTqFXU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780055109; c=relaxed/simple; bh=QOgMwlVGoSS3aWw2O4I+mn0eC5ABmtw5uXckh0d/Chg=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=ET1vDai3CpYRXuCwzuoDDN0w/ofCp306YU8EKDps6A6fZkjh6XkFcJQWQTZKws0Tv+pdwhotd/ffqTuZ8MLURzvRwTx8WI5EwN1kSJyCVUTHVfmU4szJA9pPbXb3L3WY5Qt4qrqfw0nJ7J8e45WWTitHAQP6ZlY5BKPz2cFmvBQ= 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=mWB16Zn6; arc=none smtp.client-ip=109.224.244.107 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="mWB16Zn6" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=onurozkan.dev; s=protonmail; t=1780055098; x=1780314298; bh=teMeCr9MNW9sCv6xOxoqpMjTo09nSFeejzagqRk5rM4=; h=From:To:Cc:Subject:Date:Message-ID:From:To:Cc:Date:Subject: Reply-To:Feedback-ID:Message-ID:BIMI-Selector; b=mWB16Zn6lO6kJTHFFWq2Dr+MPadde1ZYuJUxn9wQ66j6KEHS+KKIO6i6Hw/RP9pI7 CMhPv2PTnQhBdRzDj4ZVcRpvRpdPo8LzkiKuxUVerKWQRnnhDYDCBRTI+lTKTejeKJ lzy+84F7a30XdENhRMmNMVzWA2ThfWptEwslE2c5lYksjzQ/z58V8bNTOYGkqrgGwq wLd+QzsoURGxVzs4D64moni7tIX/QVaH6aWg41w3R1ytYZ+hwhwUYHv/aVe84u/VHz 8g/yEh7NRJ+twfv1QRe/c+bmxZNYxMMKXmdoz7Q76uOIcLsgT/znqaRmQ0CKmQ2yFq K1WjjCoDLgFsA== X-Pm-Submission-Id: 4gRhNk40RHz1DF6t 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 v8 0/4] rust: helpers: add SRCU helpers Date: Fri, 29 May 2026 14:43:49 +0300 Message-ID: <20260529114449.112066-1-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 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 | 5 ++ include/linux/srcutiny.h | 13 +++ include/linux/srcutree.h | 24 ++++++ kernel/rcu/srcutiny.c | 2 +- kernel/rcu/srcutree.c | 25 ------ rust/helpers/helpers.c | 1 + rust/helpers/srcu.c | 35 ++++++++ rust/kernel/sync.rs | 2 + rust/kernel/sync/srcu.rs | 173 +++++++++++++++++++++++++++++++++++++++ 10 files changed, 257 insertions(+), 26 deletions(-) create mode 100644 rust/helpers/srcu.c create mode 100644 rust/kernel/sync/srcu.rs -- 2.51.2