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Sat, 18 Jul 2026 01:32:53 -0400 (EDT) From: Boqun Feng To: rust-for-linux@vger.kernel.org, rcu@vger.kernel.org Cc: Miguel Ojeda , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Daniel Almeida , Tamir Duberstein , Alexandre Courbot , =?UTF-8?q?Onur=20=C3=96zkan?= , "Liam R. Howlett" , Andrew Ballance , Alexander Viro , Christian Brauner , Jan Kara , Lyude Paul , "Paul E. McKenney" , Frederic Weisbecker , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Uladzislau Rezki , Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Sumit Semwal , =?UTF-8?q?Christian=20K=C3=B6nig?= , Greg Kroah-Hartman , "Yury Norov (NVIDIA)" , Asahi Lina , Matthew Maurer , Lorenzo Stoakes , linux-kernel@vger.kernel.org, maple-tree@lists.infradead.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org Subject: [RFC PATCH v2 0/4] rust: sync: Introduce Rcu*Box Date: Fri, 17 Jul 2026 22:32:43 -0700 Message-ID: <20260718053247.25154-1-boqun@kernel.org> X-Mailer: git-send-email 2.50.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 5C41140008 X-Stat-Signature: f4n6i3ga1chaqe6bg43nirurse8oxroz X-HE-Tag: 1784352778-462844 X-HE-Meta: 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 YqVAuJWF 1K4RRuEan+0JrK2YanV6f0kAsh3AJrtlh7pB8ppA1N1GILCvMnDheLgZXEp1+iHMsJ2Y9ixPpDWA+c2uZW9XmRAxKUjey6MXCsyPpDWGd1/HjABilpJU2PQYEA0RuIXFQpgc6c5le/YQKKWJIn7cUcTG4khQv0wX5p0sOiqACqZlZU1knrSS2mTLwvrKhBF+K0W33EZDdR4lidRxajGLhFndBQjOIarwSLsKXD91agbpt3Hsb46KIgzicRaZ14M+OPD7U0721go/X2uARk97nX5g4QVPKrHSuDhOwIO9iefWXxe4qPM2TXpJk65M2qAVimDWbDuxF8DqTRAfmr/hU+lnd8bYtqALSSxvwNbzym4ykTnBckOwBlEG42ylzj4i5zwD5V0JMvETpuXE= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: v1: https://lore.kernel.org/rust-for-linux/20260605133541.22569-1-boqun@kernel.org/ Changes since v1: * Rebased on 7.2-rc1 * As Alice pointed out [5], RcuFreeBox::with_rcu() should return a type that disallows extending the RCU read-side critical section to outlive the guard. As for now, no user needs with_rcu(), hence remove it. * Includes a not-for-merge example based on Alice's patch. v1's cover letter ----------------- (this series is based on Alice's RFC [1] and discussion around Philipp's patches [2], [3]) As an easy way to provide RCU-protected allocation, two major types are provided: - `RcuBox`, inner T will be dropped and after a grace period. Users: binder with maple_tree and dma_fence. - `RcuFreeBox`, inner T will be cleaned up immmediately and freed after a grace period. (Name suggestion is welcome). This is an attempt to consolidate Alice's `PollCondVarBox` [4] into a generic implementation, InPlaceInit support is still missing, but I want to get some feedback on the trait `RcuFreeSafe`. [1]: https://lore.kernel.org/rust-for-linux/20260116-rcu-box-v1-0-38ebfbcd53f0@google.com/ [2]: https://lore.kernel.org/rust-for-linux/20260530143541.229628-2-phasta@kernel.org/ [3]: https://lore.kernel.org/rust-for-linux/20260520131725.266014-2-phasta@kernel.org/ [4]: https://lore.kernel.org/rust-for-linux/20260523-upgrade-poll-v4-0-f5b4c747eac2@google.com/ [5]: https://lore.kernel.org/rust-for-linux/aiLXWHg22P6OTb7O@google.com/ -- 2.50.1 (Apple Git-155)