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 E2B6D3B5839; Thu, 18 Jun 2026 10:01:11 +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=1781776872; cv=none; b=AatjWQ0tNw1cDDXIWt1j3ZVqAgjBOUrnQNGCOd+/OCLUo2WRPF1kM00wpzFwq9yMmv2R+4tqf7v4PT4MqzeuJe9Nz+80fF67qRwWkoXT8vzrw+EKWPG+DQvjRHy43UKEtn2qZoHiNnQ0WQRhB3MBGT79cu1r77veTdOU7lQqNHU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781776872; c=relaxed/simple; bh=VNeO7poUfFWbgQNDHO5CryZUV/RBMwP4z6Tx4OUWfD0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=GvuACl3Yj1NiewpHFyO0ODAJsNIW4J6Ua1oKLGcVg6tKLBuKaoDVYPnCkIDHa7Jv9HwpI1ebEJ+ZvModWZkNBqvG/r0Sdjg2Hx6VlCwIjVDWspqAwPJHhSGkP/pvT6ABnpx8HE+TPEpQcCA6OzyA2NsoXaj8VED9autE156Ef6M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=W+Sxb16l; 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="W+Sxb16l" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4BA591F00A3D; Thu, 18 Jun 2026 10:01:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1781776871; bh=fp5BohUdxSO9dl+7Lasz2DT7C7uvOPkwGRxzZG9K/+c=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=W+Sxb16lXDKTX2T8oGTmiLdSPevJ8lOadUjBo6vDB95vugveSAJd6lTUF42EnrUzn Elg1iRfMp4frZQA3ovZ716CtG13QpDthHgRJzmshFY2QuSVmrpbzk5PsdBn2F9PJfX Qc1IGONMss3qUL3+CRmo3nSvUO3Q6ouCVHt5oMNBCD5O4B//k+Ncl7VJXP5cenqOrT pEGl3E6yTI9apTu3eNFv1u5v9D9pjdyuiJa1qifHRSbtVzkXOBTtRv5V9tmSwPwbW1 tzcd1LoTsJw6A+8sVeVCR8GY1VFworPXZjxKBrZ+pCJ/LjofwjeswjelNrVi+LqZz1 CMYnFFLNOZxaQ== 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 , Daniel Almeida , Tamir Duberstein , Alexandre Courbot , =?UTF-8?q?Onur=20=C3=96zkan?= , 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 , Philipp Stanner , Christian Schrefl Cc: rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, rcu@vger.kernel.org Subject: [PATCH 1/3] rust: sync: Add abstraction for synchronize_rcu() Date: Thu, 18 Jun 2026 11:59:50 +0200 Message-ID: <20260618095952.3687099-2-phasta@kernel.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260618095952.3687099-1-phasta@kernel.org> References: <20260618095952.3687099-1-phasta@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit synchronize_rcu() is a frequently used C function which is always safe to be called. Add a safe abstraction for synchronize_rcu(). Signed-off-by: Philipp Stanner --- rust/kernel/sync/rcu.rs | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/rust/kernel/sync/rcu.rs b/rust/kernel/sync/rcu.rs index a32bef6e490b..9b9addf8fedf 100644 --- a/rust/kernel/sync/rcu.rs +++ b/rust/kernel/sync/rcu.rs @@ -50,3 +50,11 @@ fn drop(&mut self) { pub fn read_lock() -> Guard { Guard::new() } + +/// Wait for one RCU grace period. +/// +/// You typically do this to wait for everyone holding a [`Guard`]. +pub fn synchronize_rcu() { + // SAFETY: `synchronize_rcu()` is always safe to be called. It just waits for a grace period. + unsafe { bindings::synchronize_rcu() }; +} -- 2.54.0