From nobody Wed Dec 17 21:26:40 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 134DF192B76; Fri, 6 Dec 2024 19:35:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733513707; cv=none; b=Fpji0XtzwRVQGh3wxQE4rWBuOUmM/veXu97WxGGIUF6kqUM+usV+I2UUCfqmaZ2TuO29nVK0GVLXG63VgH2el6dKGEuuZQndglOuylkaTkk76MPQ4Xqm8/4jxl0LEoKDkfeDsL6iEsiP+p9JDGhnsP2hRlAsWs6mTp/tm6DLNu8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733513707; c=relaxed/simple; bh=lDPl01izmHRdpX/4BbDdhKpVVoE+jqsdSqSjquB7akA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=lRAyBq0YJhJ/2RhxxhtTGwyJUq+Ol56SJjeJVk8YjNB+cRZwgK+apYmNC9xWbfika0bpV1smfyx2boGfhR9lVCBQ3NHNFtSSTLsj4ihD5qXBh5Km0dUJHar1+4xONxn62jYQIoeeqowE24LVCUui04+Ng2keclPzmpj5Xmwv5aU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=uD4jVU35; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="uD4jVU35" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 009B0C4CED1; Fri, 6 Dec 2024 19:35:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1733513705; bh=lDPl01izmHRdpX/4BbDdhKpVVoE+jqsdSqSjquB7akA=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=uD4jVU35ESf/s1A+zsxTylVGmnky49Vg9Cf9lMerF58jOsCkJu0MPqKeL7Dm8a5/w uSM0o0a8vmT8LHeNHnHn3vhZ0BpnhWP3vARhpCge07jYgnBfha/BNWKTVKZOeBlGVI PdrKPspTCPgroBPaJNL/Ih694+WTOKpWbl4kAUEhDY6egUltvZOf7/eHYvPT2hWYSb qBRxZ11BZ/6NUGdAhD271tD7DIfnPfcAz9HOFN0f87YmzRiL2nnop+jJleUN137XsY VAgh52kogyv7El4bS0LO+80YWxUYsWO3yFO9bP33C/J//BaTqai3UXPaSWgP8WcIR5 MZxekVXMPEBhQ== From: Andreas Hindborg Date: Fri, 06 Dec 2024 20:32:55 +0100 Subject: [PATCH v4 03/14] rust: sync: add `Arc::as_ptr` Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241206-hrtimer-v3-v6-12-rc2-v4-3-6cb8c3673682@kernel.org> References: <20241206-hrtimer-v3-v6-12-rc2-v4-0-6cb8c3673682@kernel.org> In-Reply-To: <20241206-hrtimer-v3-v6-12-rc2-v4-0-6cb8c3673682@kernel.org> To: Miguel Ojeda , Anna-Maria Behnsen , Frederic Weisbecker , Thomas Gleixner , Danilo Krummrich Cc: Alex Gaynor , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Alice Ryhl , Trevor Gross , Lyude Paul , rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, Andreas Hindborg X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1772; i=a.hindborg@kernel.org; h=from:subject:message-id; bh=lDPl01izmHRdpX/4BbDdhKpVVoE+jqsdSqSjquB7akA=; b=LS0tLS1CRUdJTiBQR1AgTUVTU0FHRS0tLS0tCgpvd0o0bkFGdEFwTDlrQTBEQUFvQjRiZ2FQb mtvWTNjQnl5WmlBR2RUVVdzZWRubjNRZlNIRk45cnNLcFpKbHpFClRuVmtXY0FGQWNYRVN0bmNJ dUdld0lrQ013UUFBUW9BSFJZaEJCTEIrVWRXdjN3cUZkYkFFdUc0R2o1NUtHTjMKQlFKblUxRnJ BQW9KRU9HNEdqNTVLR04zakUwUUFKOERaQVVucjg2cmhCUnBMR3NiYis0aE5UWloyb1VqM1U2Zg pVR0ZPRW92V2ZSb0djdWZpRWdzTVR0M3M3ZEdxSXlEWHZiUEhVNzZwWWdBTkdncm9wZm8wRzNIZ DVvS213TWlkCkxWa1hjL2FYbTFVK0FjQWl2VHpNaElXQkdvU3FST3hJTjEwMTZRekplNjFQSHV2 cXBKd2FydEdaeitwdG8wVlAKMHh0RU16cFBUeWo2SU9lcHRMTjFraENESTNsWDJMclFpSGc1S2l ycTAxbVpheUttSEQ4OTVvVEU3NHpEWVNDcQowL2h4OFVuQjJJY0lCMGlnMGxYMTJKSERjK0NmQX hSbkNoeWd4V0V3SEszRWtnaGo2dDRaQVdOcnpncUh6SVBIClI5S2xzYkZCajBXdFJkSmtwOWx6c UZlcVZ5YmMweHdNdHRWUlpmQTl5QVNJbWs3QWRQVlVtK05HNGtTMHdxemUKTDJwTS9lQkN4UjNJ UnVGM2hVdi94azhIbVF0T2xoVHQvNDVRbzArZDlhUzE2bTZuQmRGcGdjYWwxWDlEYzQrVgpHUmp 3Rlp5bkhjUUhwYnBCcFRBYTJNaDdVMVdhSzR3VmgxZXd3eW1wMDFtTXZCS3ptNHROZExNSTZuY3 BPdlV4CnVOWXMxdmVpZklRa2VETWgwaWNId295WE56THVENE8yUUk2MTFnbVBYdjJENW5OV0dBR kptUnBnaURzKzlHMWQKdDhKY09GUnQxSjNmTGZaRXYrSFIrRXZLc3RHZkhUd3dpVEdpS2NZUWha QW1nN2tUbzlmcmtxQVZHTjJhaDVaTwo5QU12d1RwcmFLQ3RzWGQ5RndQbkYyUGN0a0tlVzNkTWt 2ODM1RCtqYS9BQ1pQcXpXbHVaZVcyWFJGY3RGTHYzClNjV1FKNld3Z25Za2N3PT0KPTdCcCsKLS 0tLS1FTkQgUEdQIE1FU1NBR0UtLS0tLQo= X-Developer-Key: i=a.hindborg@kernel.org; a=openpgp; fpr=3108C10F46872E248D1FB221376EB100563EF7A7 Add a method to get a pointer to the data contained in an `Arc`. Signed-off-by: Andreas Hindborg --- rust/kernel/sync/arc.rs | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/rust/kernel/sync/arc.rs b/rust/kernel/sync/arc.rs index fa4509406ee909ca0677b78d5ece966089ce6366..3d6111ddb007285b26eca2177a4= 12033f4ac5dcb 100644 --- a/rust/kernel/sync/arc.rs +++ b/rust/kernel/sync/arc.rs @@ -233,6 +233,15 @@ pub fn into_raw(self) -> *const T { unsafe { core::ptr::addr_of!((*ptr).data) } } =20 + /// Return a raw pointer to the data in this arc. + pub fn as_ptr(this: &Self) -> *const T { + let ptr =3D this.ptr.as_ptr(); + + // SAFETY: As `ptr` points to a valid allocation of type `ArcInner= `, + // field projection to `data`is within bounds of the allocation. + unsafe { core::ptr::addr_of!((*ptr).data) } + } + /// Recreates an [`Arc`] instance previously deconstructed via [`Arc::= into_raw`]. /// /// # Safety @@ -508,11 +517,11 @@ unsafe fn new(inner: NonNull>) -> Self { } =20 /// Creates an [`ArcBorrow`] to an [`Arc`] that has previously been de= constructed with - /// [`Arc::into_raw`]. + /// [`Arc::into_raw`] or [`Arc::as_ptr`]. /// /// # Safety /// - /// * The provided pointer must originate from a call to [`Arc::into_r= aw`]. + /// * The provided pointer must originate from a call to [`Arc::into_r= aw`] or [`Arc::as_ptr`]. /// * For the duration of the lifetime annotated on this `ArcBorrow`, = the reference count must /// not hit zero. /// * For the duration of the lifetime annotated on this `ArcBorrow`, = there must not be a --=20 2.46.0