From nobody Thu Dec 18 07:50:52 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 9CA2A1482E7; Tue, 17 Dec 2024 15:20:23 +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=1734448823; cv=none; b=Iqt8FDGLHAPb6Rj3JVYEQoPrW0gSReVUMpf3HuQK1t/TaqKRV0+5nfjTyJCJmTfXeF+2fc7ttZA0ID7QK7WtmHeawYJnxsjvOOyVWpysVG5DDNgqfdO2mmcNZAbTJvn1fWbfe6HDd8FknEccIpmnXGXF3HZCq4VMoOGD1cPi7Zw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734448823; c=relaxed/simple; bh=aU3i369UGy3y1q8jWHIGozb7YdRezhyOhvtwK08LAa8=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=B90E61LaPn8Bw95bU9pkZQBm1Q9frs6e43olXNKa+t2tjeo7pvNMEn34VFx0WS414YyyETLwuqN/IL5BceXI6ApuCK3qz9WfRSHPLWjuLoQXg4qCd7r+NXXGkTyaE3/m3qlQRMJ0zYoA4BBFIPzho5mfMHE9kkTHb8Ax6lufNcI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Dr9FyvHy; 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="Dr9FyvHy" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BBB0FC4CED3; Tue, 17 Dec 2024 15:20:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1734448823; bh=aU3i369UGy3y1q8jWHIGozb7YdRezhyOhvtwK08LAa8=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=Dr9FyvHyXhgQm7+T+4Xt+K/TDxwLRsN92+LzoSyMl6CF3l7AYDAjO0uzhhmCqalTB YUqlOk4yGGRs3nvVw0PWb8alzJwQfevAF+LxKcnibNJ00/oXshsifVKDLoIAjagNoU 7Al81evqBUp0p4hckgmagRGseiWyIKmo/ROv80pBLySphwYgqZvnfHvm3djtdf4Qnw C9pBLEfk2N9KnkoeYRxbxHjAccivF0iDKvZSvuYTKS3xdacWDHVUWxG5K+FbyZ4djX ereyIAP1BUVQ95E+Qk7bPuMYaWfKNbN/mltin8VrKLXqeamdvr39OqEOkb14couFR/ 6hPFYGgARQyEA== From: Andreas Hindborg Date: Tue, 17 Dec 2024 16:17:34 +0100 Subject: [PATCH v5 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: <20241217-hrtimer-v3-v6-12-rc2-v5-3-b34c20ac2cb7@kernel.org> References: <20241217-hrtimer-v3-v6-12-rc2-v5-0-b34c20ac2cb7@kernel.org> In-Reply-To: <20241217-hrtimer-v3-v6-12-rc2-v5-0-b34c20ac2cb7@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 , Guangbo Cui <2407018371@qq.com>, Dirk Behme , Daniel Almeida , 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=aU3i369UGy3y1q8jWHIGozb7YdRezhyOhvtwK08LAa8=; b=owEBbQKS/ZANAwAIAeG4Gj55KGN3AcsmYgBnYZYTGjzQEzj8dKhz3E/Exy2volMGLExqfJVVT xvzZjs2sE6JAjMEAAEIAB0WIQQSwflHVr98KhXWwBLhuBo+eShjdwUCZ2GWEwAKCRDhuBo+eShj d5vKD/9gXTHnCWwOkdFZm7xlp10yG1nHe7MR2A72J8VS8V5RvV0gLgn8tLUSDFxfVlZ5Vryev0E aInNLWa9C7VEF4xcWmxcTGzd9A7RVuxuJebgQTd+xmbrfTfu+6NTI3ST7aHMCWZXfLUWE2Yzkdn gG3ndW+JfNy/lFBoEyK+VqROmaAlZaExIzsDcwnRJy6WMabBJybewAmqqCKHFjMEpQz7rY1VgKt hIf9t6G9bQopI0erEEbQjbB/8BvG16pkz6VztcOMs6T01ynKZz6Dvioor8sVadsvZkhjYrSBOV6 N8kLS4g/L1uLUhKT/NjlVnLx8kMjVPXauCw/EjxUpcCB8Ls8uZY2LE3DfAU5V179D/T6pkjgH7B j4J/+roKdf5ZZaUG1QhknNhagpEvaF9/Ma73YzBtBWxZdTW5/lU2uFH7Ds9ereOJ2qwxJgRAVCW trz1Icv3yY5LS0rUk1u8GfqeS46ZT2ORjeGFT2aD1az8kb/buJAMVyMvZsN8d56RFizk5+Vx5ET BPVgpiMDP714ECPaCyoCvDwUUCEAGqqWuOl7oKbtgtv7LSIM6sbaoquWn6LkdVURs498YxGXUfc 6qrJ/7zcVau+s9WBf4zNnX1eLBnki/JOLIc9AIYKaVX4iF4sxpgfJsi1ywm1hPlR+u2g25dEXtg mP438o+E1GlkOPA== 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 2.47.0