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Date: Sat, 30 May 2026 17:27:38 +0200
Message-Id: <DIW48C65445Y.1VVD8AEDB35UM@kernel.org>
Subject: Re: [PATCH 2/4] rust: rcu: add RcuBox type
Cc: "Philipp Stanner" <phasta@kernel.org>, "Miguel Ojeda"
 <ojeda@kernel.org>, "Gary Guo" <gary@garyguo.net>,
 =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= <bjorn3_gh@protonmail.com>, "Benno Lossin"
 <lossin@kernel.org>, "Andreas Hindborg" <a.hindborg@kernel.org>, "Alice
 Ryhl" <aliceryhl@google.com>, "Trevor Gross" <tmgross@umich.edu>, "Sumit
 Semwal" <sumit.semwal@linaro.org>, =?utf-8?q?Christian_K=C3=B6nig?=
 <christian.koenig@amd.com>, "Paul E. McKenney" <paulmck@kernel.org>,
 "Frederic Weisbecker" <frederic@kernel.org>, "Neeraj Upadhyay"
 <neeraj.upadhyay@kernel.org>, "Joel Fernandes" <joelagnelf@nvidia.com>,
 "Josh Triplett" <josh@joshtriplett.org>, "Uladzislau Rezki"
 <urezki@gmail.com>, "Steven Rostedt" <rostedt@goodmis.org>, "Mathieu
 Desnoyers" <mathieu.desnoyers@efficios.com>, "Lai Jiangshan"
 <jiangshanlai@gmail.com>, "Zqiang" <qiang.zhang@linux.dev>, "Daniel
 Almeida" <daniel.almeida@collabora.com>, "Greg Kroah-Hartman"
 <gregkh@linuxfoundation.org>, "Igor Korotin" <igor.korotin@linux.dev>,
 "Lorenzo Stoakes" <ljs@kernel.org>, "Alexandre Courbot"
 <acourbot@nvidia.com>, "FUJITA Tomonori" <fujita.tomonori@gmail.com>,
 "Krishna Ketan Rai" <prafulrai522@gmail.com>, "Shankari Anand"
 <shankari.ak0208@gmail.com>, <manos@pitsidianak.is>, "Boris Brezillon"
 <boris.brezillon@collabora.com>, <linux-kernel@vger.kernel.org>,
 <rust-for-linux@vger.kernel.org>, <linux-media@vger.kernel.org>,
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To: "Boqun Feng" <boqun@kernel.org>
From: "Danilo Krummrich" <dakr@kernel.org>
References: <20260530143541.229628-2-phasta@kernel.org>
 <20260530143541.229628-4-phasta@kernel.org> <ahr9gtzQLSbPeBx_@tardis.local>
In-Reply-To: <ahr9gtzQLSbPeBx_@tardis.local>

On Sat May 30, 2026 at 5:08 PM CEST, Boqun Feng wrote:
> type RcuKBox<T> =3D RcuBox<T, Kmalloc>;
> type RcuVBox<T> =3D RcuBox<T, Vmalloc>;

type RcuKVBox<T> =3D RcuBox<T, KVmalloc>;

> To support RCU-protected vmalloc allocation, we need to make `RcuBox`
> generic over `Allocator`. Currently this works since all `Allocator`s
> are either kmalloc() or vmalloc(), and kvfree_call_rcu() works with both
> allocations.

I think we can add Allocator::free_call_rcu().