From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 3CB843264FC; Tue, 16 Jun 2026 08:29:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781598545; cv=none; b=mk5llPOtopbZ4CnDBB3HpG5WKHxmyAeMI8QoABEaBMYWr9vk/TSPn86oNwQY5ulO0nJreLfmiyUiA24q8Fr/oYZTHsc4gGMHUU2mNl6QKi3uziK9iRszi0sJaU24FQt6w3DQ5w9sfDty23TA3l32Jsm/wHM1E0r2eaIzfl9q+ys= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781598545; c=relaxed/simple; bh=uXXhcbssVJPY3FgKTpSNnGk0LDr3IofydGVrBbqGdKo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ABM9gV8tlEz1v7vzXu6uFzx8N1mAP4OIr65uv1bY7+L5XrE8VMBk+K1zOOhQ0xMc+FcWgvj+g7nfNKTVcaIcsoiDT9BiU19nWSNbzXvyDXyugtJNltwnfo6EB0vgZtUmmC8d7pAsVwTpdsXMxLkCUArAstKogm05Dn+RrOGPa7A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=DZUqxcth; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="DZUqxcth" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 973EE1F000E9; Tue, 16 Jun 2026 08:28:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1781598543; bh=nwjdFbfnfPzy5MFpaG+40dlKcUPGMH1BdGJi8LOKcvk=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=DZUqxcthi5ZMT1K1S3XI9wRabvel3Rk34VN4y1cGuJpKhgUEt9qkBJp2YoTCV5nW5 Nhavv2LhokxnXKwIN5+vYoxJtzBC5HlzY51gVojmO5EeUuw2guHEAcV97QGzhzY0v3 UnZKLzoSV55HBCewq6DGf4Eu6LOQ58D7hg6RFPoMr0sYXsMjA04BMaODDCE0OUiHwn 71kbgXUIlsM255O0ZLeQ+il2Q2u+8V2p6mZ47PdTQVenjayLKr01DponxBHQVMyUA5 gvK3Uzu+oOX0CBicye+o0kZXODRk/y/qt8GJaUAu93j1jlrNVL5t2iz+kwyt3V+Wmh gNLQc9dY20flg== From: Philipp Stanner To: Miguel Ojeda , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Sumit Semwal , =?UTF-8?q?Christian=20K=C3=B6nig?= , Philipp Stanner , "Paul E. McKenney" , Frederic Weisbecker , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Uladzislau Rezki , Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Daniel Almeida , Greg Kroah-Hartman , Igor Korotin , Lorenzo Stoakes , Alexandre Courbot , FUJITA Tomonori , Krishna Ketan Rai , Shankari Anand , manos@pitsidianak.is, Boris Brezillon Cc: linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, rcu@vger.kernel.org Subject: [PATCH v2 2/6] rust: sync: Add abstraction for rcu_barrier() Date: Tue, 16 Jun 2026 10:28:14 +0200 Message-ID: <20260616082819.2943886-4-phasta@kernel.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260616082819.2943886-2-phasta@kernel.org> References: <20260616082819.2943886-2-phasta@kernel.org> Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit rcu_barrier() is a frequently used C function which is always safe to be called. Add a safe abstraction for rcu_barrier(). Signed-off-by: Philipp Stanner --- rust/kernel/sync/rcu.rs | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/rust/kernel/sync/rcu.rs b/rust/kernel/sync/rcu.rs index a32bef6e490b..eef34bf86259 100644 --- a/rust/kernel/sync/rcu.rs +++ b/rust/kernel/sync/rcu.rs @@ -50,3 +50,9 @@ fn drop(&mut self) { pub fn read_lock() -> Guard { Guard::new() } + +/// Wait for all pending call_rcu() callbacks, if there are any. +pub fn rcu_barrier() { + // SAFETY: `rcu_barrier()` is always safe to be called. It just might wait for a grace period. + unsafe { bindings::rcu_barrier() }; +} -- 2.54.0