From nobody Wed Dec 17 21:26:36 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 F3A37192B76; Fri, 6 Dec 2024 19:35:14 +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=1733513715; cv=none; b=NI03eAe8YARcbEKQhmQhXhgUJqK7MPSJrSFlGfkAH9Htr3vPppivYMnMj2gAPO/OTG3+uk7lSSkNdDcA093NyHo+0Gq8egIUlvQn6/5VcWeyKhBy4fJdq2vpNPuJOKXcLRu6PLGmdA3fqae9Qtq8sbv1SUUfz63Fia7lWLsm86U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733513715; c=relaxed/simple; bh=6xLEbR0EIB8Nn0LgnN+aKPyBmaJP6NyFspAESdf3mNM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=rS3oqXKEvKcnzZmYf0RVNcs10cy85rGxHZRadGK1gqfKP/Rzrfiq6x5x3IjbI5Eh8YwVmBW8vMCPiqeGqw+iWOov0GIfd/vBH6g1H6biPETmqFg9xm4VncLCMBi7+41GIl4W3wkrpS9lsimEpQb5rqNVuCcGMyVj27HavvxVu8o= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=l9ObnEFJ; 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="l9ObnEFJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DA0A0C4CED1; Fri, 6 Dec 2024 19:35:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1733513714; bh=6xLEbR0EIB8Nn0LgnN+aKPyBmaJP6NyFspAESdf3mNM=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=l9ObnEFJr0DlDWafnqrUCs0s4pYo9sP/F6Xm1ofs2vUGmneEuf9zPG0XCCioNORQC 4X32/ZfGlf444ffh59oDK0pTEaziyzoPtipKw56MKGEFk6zWyw+AltHPrsWqwbRWRY Rv0gK0Bm1rlsgGhJPgjIGWZSOhZFHp+lnpPWxtKsv0QwkhfaT5HFT1LQGnGTGrt3Qq fycuitNrQf9jCQ4z6H/PPyU6HWnzHRt0rW9x2O4jSO4yiFxSoneHgjKLVu1oO3vNTF PqHLHshwSIt31VxUREn8Ja7qWsopngh+Huth46p/EsQx2QuaFK7b1lZBw8gM8A5sGY xyrf/jKO/Ntxw== From: Andreas Hindborg Date: Fri, 06 Dec 2024 20:33:02 +0100 Subject: [PATCH v4 10/14] rust: alloc: add `Box::into_pin` 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-v4-10-6cb8c3673682@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=1332; i=a.hindborg@kernel.org; h=from:subject:message-id; bh=6xLEbR0EIB8Nn0LgnN+aKPyBmaJP6NyFspAESdf3mNM=; b=LS0tLS1CRUdJTiBQR1AgTUVTU0FHRS0tLS0tCgpvd0o0bkFGdEFwTDlrQTBEQUFvQjRiZ2FQb mtvWTNjQnl5WmlBR2RUVVhHSitJZ3dHNEx1TEZzTTR1c1RNZmc4CjJjNnhkS1RjdTJEQVJyWW5h MEorM0lrQ013UUFBUW9BSFJZaEJCTEIrVWRXdjN3cUZkYkFFdUc0R2o1NUtHTjMKQlFKblUxRnh BQW9KRU9HNEdqNTVLR04zMmdNUC9pQk5qTm9FME5nLzJnbnZyaWlCNDBqalpTcVFid3NZcWRLUg pLbDh6bEszT0UwQjBCTDM4eU02YXNiYjhXYlJqdVZDU0hVQ0ZFWEVYNTNvUm5hU2QvRU1oMWVWQ lNLcE5qZmR0CjEyMllKcmpJQlRGNjdyYkR2NzlkLzlncVNhTlRONTBOQ0NhNmowUHEwN1U1OG0x UHlMdFpEVmwvek1HQmV3QkIKMjcrUi9jMlZBM1FpSXNJUWpHYnFHVkcrRDlrVjZGaVo4Mmc1Z1B aZEhBRHp1MnZzRmlUSWNucmJGZjh0Nm5vMwphRURlaUM3c0d6SXNPL09seXQ0WU5mSzdxWHlKcl VXT08vRTJBM05mZ0doRzQzalZzcGZhMUo2NFhtVTlwN0FVClNrcytPZGY0cFVneWJjL0VMUy9Qd Uk4MGVRWEtCS29vSzFlTWQ2WmQ1cFc4Y09xQ1cvbm01cUlTQ3FEQThuQlYKRkQzbXlnSU5DbXFN NjhaMTBCL3ppYldHMjc3Tm54T2F4eWNWTlhMT0MzRjBZMnM3QmZma1NHU1hYbHpNTENVVApTWFN UZWdpRWYxUWlYRUhwVGxlM3hCUS9WK0RTbU8rVmhhVEVHSEZqd0JiaDdpcVlpaFN1Z2wvenJKci tvNG5XCjQ2QWRWenRVcWtia3lTRGdYeElrUVF2NzdSS0l2RldTdU9ISVh6UGwzODFkT1ZKNkdpV HNrY2pydVZocnhLZk4KaTE2U0tqSEwvWTFPcWdCTTZ3eGdXY2FTZXZrMWtTcENDKzNZd0FLNHUy WnY3aHgzNmZ1TndRRkh4cjdwcUpxLwplNzVSQXdSWUNEbElNUFRlUVM0YlNUOWc4TlR2MmM0SmR yNVRFc0g3MmUveFpMZ1lodmxuZ3dYYjVIZlYydmJoCkNheUh6TWlrRXlNdDlRPT0KPTFLV24KLS 0tLS1FTkQgUEdQIE1FU1NBR0UtLS0tLQo= X-Developer-Key: i=a.hindborg@kernel.org; a=openpgp; fpr=3108C10F46872E248D1FB221376EB100563EF7A7 Add an associated function to convert a `Box` into a `Pin>`. Signed-off-by: Andreas Hindborg --- rust/kernel/alloc/kbox.rs | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/rust/kernel/alloc/kbox.rs b/rust/kernel/alloc/kbox.rs index 9ce414361c2c6dd8eea09b11041f6c307cbc7864..1a993ec8602b37041c192458d8b= 6acff30769a04 100644 --- a/rust/kernel/alloc/kbox.rs +++ b/rust/kernel/alloc/kbox.rs @@ -245,6 +245,16 @@ pub fn pin(x: T, flags: Flags) -> Result= >, AllocError> Ok(Self::new(x, flags)?.into()) } =20 + /// Convert a [`Box`] to a [`Pin>`]. If `T` does not imp= lement + /// [`Unpin`], then `x` will be pinned in memory and can't be moved. + pub fn into_pin(boxed: Self) -> Pin { + // SAFETY: `Self` is guaranteed to be the only pointer to the boxed + // value. Thus, if `T: !Unpin`, `T` is guaranteed to stay pinned; = there + // is no way to get rid of the `Pin` and move out of the returned + // `Pin>`. + unsafe { Pin::new_unchecked(boxed) } + } + /// Forgets the contents (does not run the destructor), but keeps the = allocation. fn forget_contents(this: Self) -> Box, A> { let ptr =3D Self::into_raw(this); --=20 2.46.0