From nobody Wed Dec 17 21:26:10 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 66D2B1DE88D; Sun, 9 Mar 2025 15:23:30 +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=1741533810; cv=none; b=JmmIJQGTHcgZMquCoF3L86uXI+xndcqn4CL68XdTpnsoeIxuXVi/hL2hU9ADI1fMCPLaETkpq9VddOgRtFD+KTURHRksy/ZiEvHyD3q2Lb26SBs3ESqx5a4u8jkn4lcNqDyZWhlxBQhCQ9bidpsku4FjVxRkgPFo//IBgc8LZgM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741533810; c=relaxed/simple; bh=+Kma+nbFYfjc4yGFhq1umBDIXU4Jat/HmaZ3lk50G20=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=q3dH1NvzYc+pwdy0x40uWZnib6Sfcy1YVfGaMzcPP0UATMsHMNAnifFjiSzqBl3M27kZVrXGk/+1LwJsSbbKTSw9bEiPkMtIA7PflsEjl4h65n2hKan+BB68AGD7meukBBR+hDizmk57SHETttygLcj6cOJ7Eif3jRYlye/cNRM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lifuUnW9; 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="lifuUnW9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3CF31C4CEF0; Sun, 9 Mar 2025 15:23:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741533809; bh=+Kma+nbFYfjc4yGFhq1umBDIXU4Jat/HmaZ3lk50G20=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=lifuUnW9VTJO6b1EaevXAteYIcj4+ENT2modzKW5G0+zTkfRCWH78oYcDrRdBZ0S3 GmTqWLTzujOu6Gh4USsR7FFIebj2iqvvsXI+mmIaScSCJlPlpirZDCHvsYe6l7tRPS 0a9uv/7PJDGwo+FnzNwfqPL5H5wWhHgVAud+6YvV4PVTHdv/DR/gr6NEhItulCAPvS 6+qbNSKMVbajXx6cIsmXNG79tJbOKAQ9WxnzwBcI89J/zBV2DN4bMLews5m+6Tnx4z GlQS8Rc6NAWOdv0vuf1UEP4nyJDEAG90n6QK4bcqYilIsmoAyDKVSDOcbOA6ZxUhQ0 DLTa/Z9N/sDYQ== From: Andreas Hindborg Date: Sun, 09 Mar 2025 16:18:53 +0100 Subject: [PATCH v12 02/13] 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: <20250309-hrtimer-v3-v6-12-rc2-v12-2-73586e2bd5f1@kernel.org> References: <20250309-hrtimer-v3-v6-12-rc2-v12-0-73586e2bd5f1@kernel.org> In-Reply-To: <20250309-hrtimer-v3-v6-12-rc2-v12-0-73586e2bd5f1@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 , Tamir Duberstein , Markus Elfring , rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, Andreas Hindborg X-Mailer: b4 0.15-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=1949; i=a.hindborg@kernel.org; h=from:subject:message-id; bh=+Kma+nbFYfjc4yGFhq1umBDIXU4Jat/HmaZ3lk50G20=; b=owEBbQKS/ZANAwAIAeG4Gj55KGN3AcsmYgBnzbFoc4QCddRfOBqTbH64MPdX14gT/LUfOwrrZ O8zhs3+bgiJAjMEAAEIAB0WIQQSwflHVr98KhXWwBLhuBo+eShjdwUCZ82xaAAKCRDhuBo+eShj d1p4D/4iOQYzLnxtexmkJroI6Xc2DFwLLtvwShqZCZaNrnd7qLHQ0Shdl/fN1M8bdlrvcE+vw3W k7R+y4x/fzkWcqnAJU0uVBfxNlKCH0VCIq/35DR2HW+9gVpAkr68guzLCs9dGCQAJuuDORcVMib i8x8z0CcQ+KkkA5g4kl4uzK68hO2gUtVEUIQQ55B4qKIzWSbeEUt/4feAE4FzfxBAncYccZqDyY nhAQkh1zvzr1mtNJIeRNJnvgAJOu/Ge08y1AaZ6xdisHkkfsyPz7Z4ROVpyj+9CkcBUYc0wEpjb tfDDbt/Y4J2xjXn0eKBBJJ0QstuN+tTLr57zFP0PJpggCs43ilH7PyYEShdoIvsWVxLh+KT1dN7 O9S0TQ1ohn5pF2NSmy1ZZhqr3OBKWAgYGCUziKhhcsPTESVMr5VdrCuh0gyumHf9DRUWUeat82f 3h80s45OK5+0NPk4czjMOR9F2R7c6QwaeWtiZS+fjua09Dp7S7qJgDpODvoAsif+JlAXtgKZIlW G1AX6OHtK3rZwKdjbqB0SUYjTVrHMmHx0fm4vVwCDeyifs0/cgaVjfGMlBZ3BOR9/XZn+kODWz3 22QMbV/7AqIVjMjRQ3QF7YB4lAalscyZO1J6fc5IX1CGBOtu3dbBm6ptymZFfANrMP3iQpJ+rWG AyKYHNUAD+vbzZQ== 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`. Reviewed-by: Lyude Paul Reviewed-by: Alice Ryhl Reviewed-by: Benno Lossin Signed-off-by: Andreas Hindborg --- This is a dependency for: rust: hrtimer: implement `HrTimerPointer` for `Arc` --- 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 3cefda7a4372..1dfa75714f9d 100644 --- a/rust/kernel/sync/arc.rs +++ b/rust/kernel/sync/arc.rs @@ -246,6 +246,15 @@ 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 @@ -539,11 +548,11 @@ 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