From mboxrd@z Thu Jan 1 00:00:00 1970 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 835E4209F23; Mon, 3 Feb 2025 15:11:04 +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=1738595464; cv=none; b=VG+Cg9BGiEiYWXheCDWOboyThst8FxicDyAMZFPKITxbD0dkrst1iNlvI9QPNVt7UKnVP8REALphMD6G/j6HyAqANVtMMSuQZMTlWf30keboN8v5o1x5xJ51Kvv9cnzNf5CGpPTcfxqNtGHR+Ar47E1WiXJIzc+afLyeqoEo2/c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738595464; c=relaxed/simple; bh=aMQOiJg0/az+/dwZD+7hXRHe8iks+p3vCytu9xnUhec=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=NCqdFt6jkQGJN2nZjFYifJOclZD+yWh7hOY1fRRv5djtN8mcF1ftyRJub1qzdjkZV2erkD0eIhmfdIx3jLJg8pGCQ4H+aZ2r0oW9Ufl6c9R/d+mb+rpCcUoyxAPIO9bXguMZlK3FeUmfmwHuxxdBlwyndXg9Pwoq6Q6F+A8TpyY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=dnvoadk1; 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="dnvoadk1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 74957C4CEE0; Mon, 3 Feb 2025 15:10:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1738595464; bh=aMQOiJg0/az+/dwZD+7hXRHe8iks+p3vCytu9xnUhec=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=dnvoadk1oGORlH90eiNC2x+Tw6YzLJL8+Bn1nb4MOzXQJkXrehRr6bUzGTrg5rPOL Xk65AyE2HFzqqlFtH1tdDG0gR4FJpQA689ni9EK2NRD/BIpSVkBHTsoKQEjrJZ7tQr dhX4tB1J+wSPnA6A0Bo8tcnlPww/osU8TYGOcbg5IPusPJ/etOU1aom7QR+bL8hWoe nynPFo+lttYxK6fnTPaL0nCJWVz/2jGTW3yQo2c8Ro/Pt9yUdXCVBeQJijwm4NAlb9 NfR7F6YNpzq0U6hUWrrBrvsJ0FDf9bl+KkFurBMxId7YeldpT82aLdQx0lGzmIMg6O PQNfrzth3q66g== From: Andreas Hindborg Date: Mon, 03 Feb 2025 16:07:49 +0100 Subject: [PATCH v7 03/14] rust: sync: add `Arc::as_ptr` Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250203-hrtimer-v3-v6-12-rc2-v7-3-189144725399@kernel.org> References: <20250203-hrtimer-v3-v6-12-rc2-v7-0-189144725399@kernel.org> In-Reply-To: <20250203-hrtimer-v3-v6-12-rc2-v7-0-189144725399@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 , 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=1953; i=a.hindborg@kernel.org; h=from:subject:message-id; bh=aMQOiJg0/az+/dwZD+7hXRHe8iks+p3vCytu9xnUhec=; b=owEBbQKS/ZANAwAIAeG4Gj55KGN3AcsmYgBnoNvQKrjCssePbzr4oyEYmgf9rJ8ez/pDuFatd 8LZqNRKcJCJAjMEAAEIAB0WIQQSwflHVr98KhXWwBLhuBo+eShjdwUCZ6Db0AAKCRDhuBo+eShj d5DnEACqap/7g3HJ8Gfd9z0oa/mlRuBmg0sJGWpyVvy5LpcSZCXUX4+tFXKpYcg8JdOE9/kXIaf UC0dlwEM6T+eLvFTij72/hkNtH0JzASqR+xHgxTGc8PrD87cySYVjImBD5nZmZxvaeX7z/sK5Lr VguBgAKkm0Rc0JbhPYzNkd9e3Sxv9V11wnv43N8hjRyGcyP4U2t/o2f/Q6wjxCetfuBdgyD2BYc +gMPuLWkG8Ui+uWxFBcDjtynsOQqBnvLMG0f2F6LZTp0r3/BVamptQCiWuVuE3h88cAPUxNDxmp AHhlNuCLXP2A9fpmkbSpaaPy8LDN9Yiud4PxX4uJbC/ZXHTxfRjjq5zqWLMZvrkMrZHbvztDWP9 S+91fjeQlR/otg1nhhsCl4CU3azWJ47WXlRrSGVsLjZ45b33GRief/WOzbysmxkEhZOIw4lC3iL 2QE0V0ejpD1I65U9xooLSyc2NbBFI6nLavCFziBLF8iYnh+pnnk4pBDO1QOr6ZnLv6qgeTbRNom LWKitxE9Z2KmFwPdr8sT1adJK16seMafLXgknmQ3EBi2ohDmKloboPEwKyZ1YFtbBmcn5WZMihY VDQXOKNCgORaKZoNTT8kNUKZ1zSJNe7Txh15FUMsOu4POkDOqYomnustls0DM4/nxlECKFlllRL NajAtwpqOyDnAjA== 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 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 3cefda7a43725581dc0eaa8441e2528c161162e1..1dfa75714f9d696d138cc40c840cb3aff61b32f5 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) } } + /// Return a raw pointer to the data in this arc. + pub fn as_ptr(this: &Self) -> *const T { + let ptr = 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 { } /// Creates an [`ArcBorrow`] to an [`Arc`] that has previously been deconstructed with - /// [`Arc::into_raw`]. + /// [`Arc::into_raw`] or [`Arc::as_ptr`]. /// /// # Safety /// - /// * The provided pointer must originate from a call to [`Arc::into_raw`]. + /// * The provided pointer must originate from a call to [`Arc::into_raw`] 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 -- 2.47.0