From nobody Wed Feb 11 08:11:50 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 857C8C76188 for ; Wed, 5 Apr 2023 19:38:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229630AbjDETi3 (ORCPT ); Wed, 5 Apr 2023 15:38:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56928 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233157AbjDETiP (ORCPT ); Wed, 5 Apr 2023 15:38:15 -0400 Received: from mail-4322.protonmail.ch (mail-4322.protonmail.ch [185.70.43.22]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E73DF7DB0 for ; Wed, 5 Apr 2023 12:37:44 -0700 (PDT) Date: Wed, 05 Apr 2023 19:36:57 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=protonmail.com; s=protonmail3; t=1680723429; x=1680982629; bh=S5ndiOTk444R587cz6eQKsLf+C57xcupLszBquLvesM=; h=Date:To:From:Cc:Subject:Message-ID:In-Reply-To:References: Feedback-ID:From:To:Cc:Date:Subject:Reply-To:Feedback-ID: Message-ID:BIMI-Selector; b=XjtAfMfEFar0bfYi2prsjdoGPaslwrXi0qgDfn7bUnCxLHi96I22hFVxcZxD6a5nj ECWMccW60rBuYaRf394obLRxMwkEG6Ct9WKp6+VPlzKB/NUWLgB3DU/pvAblffnj7G kSrMeClDp/hbBB68bJlbiIP7VqkSqC9+TS9dkXtZQzEu640wPZeYI1cMp24w0pApjL ZcTcOG0Ug1I3b0zi3YlzxeWzQR4ZGKOUhJKmCYpGpRePOe7s7zj8auBUOMstj1e3QU C0F3hyhNVlPPE5aWhIzFr/KMeigk/cL92qOdGFWBSXl6D6E4sMIpVxCN4v01F19U3w 8lDna6LXWeTrg== To: Miguel Ojeda , Alex Gaynor , Wedson Almeida Filho , Boqun Feng , Gary Guo , =?utf-8?Q?Bj=C3=B6rn_Roy_Baron?= , Alice Ryhl , Andreas Hindborg From: Benno Lossin Cc: rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, patches@lists.linux.dev, Benno Lossin , Alice Ryhl , Andreas Hindborg Subject: [PATCH v6 15/15] rust: sync: add functions for initializing `UniqueArc>` Message-ID: <20230405193445.745024-16-y86-dev@protonmail.com> In-Reply-To: <20230405193445.745024-1-y86-dev@protonmail.com> References: <20230405193445.745024-1-y86-dev@protonmail.com> Feedback-ID: 40624463:user:proton MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Add two functions `init_with` and `pin_init_with` to `UniqueArc>` to initialize the memory of already allocated `UniqueArc`s. This is useful when you want to allocate memory check some condition inside of a context where allocation is forbidden and then conditionally initialize an object. Signed-off-by: Benno Lossin Reviewed-by: Gary Guo Reviewed-by: Alice Ryhl Reviewed-by: Andreas Hindborg --- rust/kernel/sync/arc.rs | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/rust/kernel/sync/arc.rs b/rust/kernel/sync/arc.rs index d05caa723718..d1a79cce5e54 100644 --- a/rust/kernel/sync/arc.rs +++ b/rust/kernel/sync/arc.rs @@ -541,6 +541,30 @@ impl UniqueArc> { inner: unsafe { Arc::from_inner(inner.cast()) }, } } + + /// Initialize `self` using the given initializer. + pub fn init_with(mut self, init: impl Init) -> core::result::= Result, E> { + // SAFETY: The supplied pointer is valid for initialization. + match unsafe { init.__init(self.as_mut_ptr()) } { + // SAFETY: Initialization completed successfully. + Ok(()) =3D> Ok(unsafe { self.assume_init() }), + Err(err) =3D> Err(err), + } + } + + /// Pin-initialize `self` using the given pin-initializer. + pub fn pin_init_with( + mut self, + init: impl PinInit, + ) -> core::result::Result>, E> { + // SAFETY: The supplied pointer is valid for initialization and we= will later pin the value + // to ensure it does not move. + match unsafe { init.__pinned_init(self.as_mut_ptr()) } { + // SAFETY: Initialization completed successfully. + Ok(()) =3D> Ok(unsafe { self.assume_init() }.into()), + Err(err) =3D> Err(err), + } + } } impl From> for Pin> { -- 2.39.2