From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2D312C55178 for ; Fri, 20 Feb 2026 09:52:59 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 8F6286B009E; Fri, 20 Feb 2026 04:52:58 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 8C3D46B00A1; Fri, 20 Feb 2026 04:52:58 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7B9D86B00A2; Fri, 20 Feb 2026 04:52:58 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 66FFD6B009E for ; Fri, 20 Feb 2026 04:52:58 -0500 (EST) Received: from smtpin03.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 17B625CB96 for ; Fri, 20 Feb 2026 09:52:58 +0000 (UTC) X-FDA: 84464371236.03.F2397C1 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf12.hostedemail.com (Postfix) with ESMTP id 1E5B440004 for ; Fri, 20 Feb 2026 09:52:55 +0000 (UTC) Authentication-Results: imf12.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=uXuKsXuc; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf12.hostedemail.com: domain of a.hindborg@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=a.hindborg@kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1771581176; a=rsa-sha256; cv=none; b=vS5Y5fp8QGWzhP8DVehhhRzS9uKZCUVRlZHWTH/NR3MvfenHy9Ld8WAFh/OJHsAbkgJDCR BgV9Dlu8soGw8Imv4CmAqKSpSfaEihDov4fEa5pEuMQr8WOk1e9tVcwVUvnVgPT5kd0F0G 3Yo40baIHF0EzxouHcOF8ED8LwOXB1Y= ARC-Authentication-Results: i=1; imf12.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=uXuKsXuc; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf12.hostedemail.com: domain of a.hindborg@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=a.hindborg@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1771581176; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding:in-reply-to: references:dkim-signature; bh=b9QmVBZa3T5JbOFmkZrKVO2YfHNJZvC69YaKtn5HHXE=; b=PKTDGg05CVXfZQnyjJjN8hb+pQhp8Xpgdp8EsjwOyhkhS4dHRf7nLlj33CoFNMrHOtWAAT PxW/eLX/qyS8JvGWhXCAekkese9rEJNP9W2nQO4n1WAwg6RTUfToU4Qi1PQws3Vujwy2RR dpYlNZIQiPfdgcmLjtNVYQlVMxKdtBA= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id EFAB9405D3; Fri, 20 Feb 2026 09:52:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CC660C116C6; Fri, 20 Feb 2026 09:52:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771581174; bh=MH7qgXhxS+4W/slhJWtX05AT1X6dliBzfHD+GHMyYOE=; h=From:Subject:Date:To:Cc:From; b=uXuKsXuc1oi5NTmbeIJbJwg0qiB09J1EnFmfBOMmbVqGRz+UJFRLx+qXIjeqU9XKI 1A90JCDNNwqq8AdAqBUjHRZkLh5RubGQkb/Juj+12z5eJNquVrH3I3xs/hXcVvfymd 9ZLhBlOiPcePHYNQ1iA7bouVitDd8VTG04OOaT9SKOK6qDSKDuFxJP5nwRasNquPv9 faOPvqwkyGSWpot7ohnKQPl2a07RtHuKchyjZ4ZvDub50nhLXx6Oj2f5PY98zCXiS7 8WovQXFjcdunMP8dhaMmzCvvqkevp1G9euoEUyOi4yqrTW3jk830t0K6KnG6r+3SSX SZeR2Dseyv9Ew== From: Andreas Hindborg Subject: [PATCH v15 0/9] rust: add `Ownable` trait and `Owned` type Date: Fri, 20 Feb 2026 10:51:09 +0100 Message-Id: <20260220-unique-ref-v15-0-893ed86b06cc@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAI0umGkC/02MwQ6DIBAFf8XsuTRARUNP/Y/Gg+CimzZgoZo2h n8veupx5uXNBgkjYYJrtUHElRIFX0CoUwV26v2IjIYiQHKp+IUrtnh6LcgiOia1s0PTKqdRQzn MRdLnqN27whOld4jfI76Ketd7p+GS1/+dsjHORGuN1Gh6a8ztgdHj8xziCF3O+QfRbXHyqAAAA A== X-Change-ID: 20250305-unique-ref-29fcd675f9e9 To: Miguel Ojeda , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Alice Ryhl , Trevor Gross , Danilo Krummrich , Greg Kroah-Hartman , Dave Ertman , Ira Weiny , Leon Romanovsky , Paul Moore , Serge Hallyn , "Rafael J. Wysocki" , David Airlie , Simona Vetter , Alexander Viro , Christian Brauner , Jan Kara , Igor Korotin , Daniel Almeida , Lorenzo Stoakes , "Liam R. Howlett" , Viresh Kumar , Nishanth Menon , Stephen Boyd , Bjorn Helgaas , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Boqun Feng , Boqun Feng Cc: linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-block@vger.kernel.org, linux-security-module@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-pm@vger.kernel.org, linux-pci@vger.kernel.org, Andreas Hindborg , Asahi Lina , Oliver Mangold , Viresh Kumar , Asahi Lina , Andreas Hindborg X-Mailer: b4 0.15-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=6914; i=a.hindborg@kernel.org; h=from:subject:message-id; bh=MH7qgXhxS+4W/slhJWtX05AT1X6dliBzfHD+GHMyYOE=; b=owEBbQKS/ZANAwAKAeG4Gj55KGN3AcsmYgBpmC6SPN6GHiEtdlstRzjq+GDhU+BAAtaEl2yZ5 dAZnwhbahyJAjMEAAEKAB0WIQQSwflHVr98KhXWwBLhuBo+eShjdwUCaZgukgAKCRDhuBo+eShj d+m0EADD1vNs5vo1isrR+dReFMAAh/IJGnL65NOiczhIAW1wZZkrrgnlL/5hKfHTutsQgv1mke4 N4j8Es0nIBqbQlz8aIzKxjyKHbjtaJ/Aae9Gmzyi2WyazIIGiGwXctb9d2QjMU68ylbnbmctfmd dTiGfbWsaEpGMSO9/g2ktoHb5GzVKC/DjLpDSx1RPC4JxYachdHG/YdIttm4+eNpOAxm/SXDYcx Qdur7+G2M/eonzgx9Clyzq6/b+HUP6AfKUB1W8IoT/vqPBQMDvgm6Wzc1Qr7/QdxfKOARrKWQ3K jSXpnSIyYCsulQo+RAXYrTt7Dp5uJEp8x8khBuQ5lq7EyhSihDWnzrG4g/uQW5HFstiTaqv23q+ JZu96aZkK7R833cL8ztJTTik5IBG8eo+MWaXRnt3EqMWdNEMJ+tNZHaHCtBrqAtK745SUom7ZR9 rmPN97whe0pdmYs+hRc10u0nuNmzCkwiZHUI2mkrfCBD9Y7EqVNvty4r6Kj4q6RC9cYYevc+KWe QVVe85NnCdnW2vEsTJ1Zj/lHRETLiyY4nsOYetdypxDfEXXkU7ekD8SaunSxjI97C6Kdf2Lk36s KF6omKgbg3Md8trx81AGUNWZM6YDm2c2ymNEtmKbyhBgwWYj7Q2CYkpLbioQazJkP9CnTx8mpGG 30dNWCcJBeMR84w== X-Developer-Key: i=a.hindborg@kernel.org; a=openpgp; fpr=3108C10F46872E248D1FB221376EB100563EF7A7 X-Stat-Signature: qmrft1tgxzy4hxxre5sfbw9o7e51rrhq X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 1E5B440004 X-HE-Tag: 1771581175-538466 X-HE-Meta: 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 y2ze9Txm dvYOVywbaiseGz1v54N16dXnNpqoIOl32wmGC/BG14dv2Mf6Zi6xna9lp7/39ysmDkcqUfrxXy4dT8p7zv8u7N/UtMQNLnwfbfSkpKFqRVP5epwGdZTjYq0PrBZgoj+eZZHaO4hCT5TI/Nsvt+vHLfhj6lBZAW1ZjT+NrC5Ut0f7IH1CvUu8OBDXXr4jDlwXTiJvbjloq9pIX2f3Sq73WacshG/1WI911RPf84lg7QmXXNJrg3MDI0lXusXIlEpnJkU+pDHrrJ9Y8BkfzdtzDTdAUVjUF99liDOZnHMqE/dpXpS1IlE7xeNKwVnXn3uoQsohxJbg8d1dzazd6/FXXjTNyD6vQ9SIp/3PEp2A9VVbD7KlIKrTJRloaTZftMwXIhcyvEcnzqWDH+YTcFXJq7nPrqw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add a new trait `Ownable` and type `Owned` for types that specify their own way of performing allocation and destruction. This is useful for types from the C side. Add the trait `OwnableRefCounted` that allows conversion between `ARef` and `Owned`. This is analogous to conversion between `Arc` and `UniqueArc`. Convert `Page` to be `Ownable` and add a `from_raw` method. Implement `ForeignOwnable` for `Owned`. Signed-off-by: Andreas Hindborg --- Changes in v15: - Update series with original SoB's. - Rename `AlwaysRefCounted` in `kernel::usb`. - Rename `Owned::get_pin_mut` to `Owned::as_pin_mut`. - Link to v14: https://msgid.link/20260204-unique-ref-v14-0-17cb29ebacbb@kernel.org Changes in v14: - Rebase on v6.19-rc7. - Rewrite cover letter. - Update documentation and safety comments based on v13 feedback. - Update commit messages. - Reorder implementation blocks in owned.rs. - Update example in owned.rs to use try operator rather than `expect`. - Reformat use statements. - Add patch: rust: page: convert to `Ownable`. - Add patch: rust: implement `ForeignOwnable` for `Owned`. - Add patch: rust: page: add `from_raw()`. - Link to v13: https://lore.kernel.org/r/20251117-unique-ref-v13-0-b5b243df1250@pm.me Changes in v13: - Rebase onto v6.18-rc1 (Andreas's work). - Documentation and style fixes contributed by Andreas - Link to v12: https://lore.kernel.org/r/20251001-unique-ref-v12-0-fa5c31f0c0c4@pm.me Changes in v12: - - Rebase onto v6.17-rc1 (Andreas's work). - moved kernel/types/ownable.rs to kernel/owned.rs - Drop OwnableMut, make DerefMut depend on Unpin instead. I understood ML discussion as that being okay, but probably needs further scrunity. - Lots of more documentation changes suggested by reviewers. - Usage example for Ownable/Owned. - Link to v11: https://lore.kernel.org/r/20250618-unique-ref-v11-0-49eadcdc0aa6@pm.me Changes in v11: - Rework of documentation. I tried to honor all requests for changes "in spirit" plus some clearifications and corrections of my own. - Dropping `SimpleOwnedRefCounted` by request from Alice, as it creates a potentially problematic blanket implementation (which a derive macro that could be created later would not have). - Dropping Miguel's "kbuild: provide `RUSTC_HAS_DO_NOT_RECOMMEND` symbol" patch, as it is not needed anymore after dropping `SimpleOwnedRefCounted`. (I can add it again, if it is considered useful anyway). - Link to v10: https://lore.kernel.org/r/20250502-unique-ref-v10-0-25de64c0307f@pm.me Changes in v10: - Moved kernel/ownable.rs to kernel/types/ownable.rs - Fixes in documentation / comments as suggested by Andreas Hindborg - Added Reviewed-by comment for Andreas Hindborg - Fix rustfmt of pid_namespace.rs - Link to v9: https://lore.kernel.org/r/20250325-unique-ref-v9-0-e91618c1de26@pm.me Changes in v9: - Rebase onto v6.14-rc7 - Move Ownable/OwnedRefCounted/Ownable, etc., into separate module - Documentation fixes to Ownable/OwnableMut/OwnableRefCounted - Add missing SAFETY documentation to ARef example - Link to v8: https://lore.kernel.org/r/20250313-unique-ref-v8-0-3082ffc67a31@pm.me Changes in v8: - Fix Co-developed-by and Suggested-by tags as suggested by Miguel and Boqun - Some small documentation fixes in Owned/Ownable patch - removing redundant trait constraint on DerefMut for Owned as suggested by Boqun Feng - make SimpleOwnedRefCounted no longer implement RefCounted as suggested by Boqun Feng - documentation for RefCounted as suggested by Boqun Feng - Link to v7: https://lore.kernel.org/r/20250310-unique-ref-v7-0-4caddb78aa05@pm.me Changes in v7: - Squash patch to make Owned::from_raw/into_raw public into parent - Added Signed-off-by to other people's commits - Link to v6: https://lore.kernel.org/r/20250310-unique-ref-v6-0-1ff53558617e@pm.me Changes in v6: - Changed comments/formatting as suggested by Miguel Ojeda - Included and used new config flag RUSTC_HAS_DO_NOT_RECOMMEND, thus no changes to types.rs will be needed when the attribute becomes available. - Fixed commit message for Owned patch. - Link to v5: https://lore.kernel.org/r/20250307-unique-ref-v5-0-bffeb633277e@pm.me Changes in v5: - Rebase the whole thing on top of the Ownable/Owned traits by Asahi Lina. - Rename AlwaysRefCounted to RefCounted and make AlwaysRefCounted a marker trait instead to allow to obtain an ARef from an &T, which (as Alice pointed out) is unsound when combined with UniqueRef/Owned. - Change the Trait design and naming to implement this feature, UniqueRef/UniqueRefCounted is dropped in favor of Ownable/Owned and OwnableRefCounted is used to provide the functions to convert between Owned and ARef. - Link to v4: https://lore.kernel.org/r/20250305-unique-ref-v4-1-a8fdef7b1c2c@pm.me Changes in v4: - Just a minor change in naming by request from Andreas Hindborg, try_shared_to_unique() -> try_from_shared(), unique_to_shared() -> into_shared(), which is more in line with standard Rust naming conventions. - Link to v3: https://lore.kernel.org/r/Z8Wuud2UQX6Yukyr@mango --- Andreas Hindborg (4): rust: aref: update formatting of use statements rust: page: update formatting of `use` statements rust: implement `ForeignOwnable` for `Owned` rust: page: add `from_raw()` Asahi Lina (2): rust: types: Add Ownable/Owned types rust: page: convert to `Ownable` Oliver Mangold (3): rust: rename `AlwaysRefCounted` to `RefCounted`. rust: Add missing SAFETY documentation for `ARef` example rust: Add `OwnableRefCounted` rust/kernel/auxiliary.rs | 7 +- rust/kernel/block/mq/request.rs | 15 +- rust/kernel/cred.rs | 13 +- rust/kernel/device.rs | 10 +- rust/kernel/device/property.rs | 7 +- rust/kernel/drm/device.rs | 10 +- rust/kernel/drm/gem/mod.rs | 8 +- rust/kernel/fs/file.rs | 16 +- rust/kernel/i2c.rs | 16 +- rust/kernel/lib.rs | 1 + rust/kernel/mm.rs | 15 +- rust/kernel/mm/mmput_async.rs | 9 +- rust/kernel/opp.rs | 10 +- rust/kernel/owned.rs | 366 ++++++++++++++++++++++++++++++++++++++++ rust/kernel/page.rs | 57 +++++-- rust/kernel/pci.rs | 10 +- rust/kernel/pid_namespace.rs | 12 +- rust/kernel/platform.rs | 7 +- rust/kernel/sync/aref.rs | 80 ++++++--- rust/kernel/task.rs | 10 +- rust/kernel/types.rs | 13 +- rust/kernel/usb.rs | 15 +- 22 files changed, 624 insertions(+), 83 deletions(-) --- base-commit: b8d687c7eeb52d0353ac27c4f71594a2e6aa365f change-id: 20250305-unique-ref-29fcd675f9e9 Best regards, -- Andreas Hindborg