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 05F023B5837; Mon, 22 Jun 2026 13:57:26 +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=1782136647; cv=none; b=NDwy81KnDY192dkpfJ9UwgDsPa0aJJ7DgYSYPmPcBNqvg0GYzOTwgbGCmK6MGwY63rO8IsvBWlUzASyD0Edb23g5CUkwSTxsiFdLvuWaufpjagg1TCiDO+BpW2kXwVtDTVSo6PjCnXjOxaqOOiDVD0GtrCtIXOsGcCHplkwS37w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782136647; c=relaxed/simple; bh=URbWDWpf0PAtCp8OcPQLWWMlHlkAyNGidSdZ+hciKvU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=nLSx1eRxwl4TeS4WviorjYKWqEtAU7hJCQb2Irg9WcLnxhqTBOuX1h+qQAHWBxJrD8/VaOHGTFROtqKaENhmQpxPSCViAU9bAIX6WWmUuhnf2aihEsvIlUmRyg1U4SXtreppISr6KIRjrBB/7Py8fYkdcmsIAnnd9JiRUyarYh8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Mj2RWPUQ; 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="Mj2RWPUQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E7E3D1F00A3A; Mon, 22 Jun 2026 13:57:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782136645; bh=bF28Yy97ZS3HuaAa6rSSBBjFbEvbdFbPcqNff/KsiVI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Mj2RWPUQd7LTkoqyPVmbe0L7b/LUOl+eBcS40e5PI+y/66J6khrIq0Wm1d/wiu17V UuCNosvweT6pITyyydebQUcYUGTnc5GqBNIXNx5WB6i0Ce2HuwELeueUYnSAERMRCG ITUS2aMEA3WDQu3O5gB1kMfdJq8XwroNUTFVbw9DfYksbGN38bN3vdnOk3jYd6K/H/ moGpqKkanZw84VssFm74pzznNRH8vYqs39JR+LzRVqJdZ/qxLuhLtjTswaFf0SfjN3 DyF4YfsNKFTy9e2C2fGKciJ8/52Xq3cJMXKE/Mz0gjID05iOs0jy9rxtFnTZanx6tX vusJb5kCtmI8A== 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 , Daniel Almeida , Greg Kroah-Hartman , Alexandre Courbot , Asahi Lina , Matthew Maurer , Lorenzo Stoakes , Joel Fernandes , Burak Emir , FUJITA Tomonori , Krishna Ketan Rai , Tamir Duberstein , =?UTF-8?q?Onur=20=C3=96zkan?= , Eliot Courtney , Mirko Adzic , Alistair Francis , Shankari Anand Cc: linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org Subject: [PATCH v4 3/5] rust: sync: Add abstraction for rcu_barrier() Date: Mon, 22 Jun 2026 15:56:51 +0200 Message-ID: <20260622135654.334961-5-phasta@kernel.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260622135654.334961-2-phasta@kernel.org> References: <20260622135654.334961-2-phasta@kernel.org> Precedence: bulk X-Mailing-List: linux-media@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..9196feb62d6d 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 [`bindings::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