From patchwork Fri Mar 7 21:58:49 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tamir Duberstein X-Patchwork-Id: 14007182 X-Patchwork-Delegate: bhelgaas@google.com Received: from mail-qk1-f172.google.com (mail-qk1-f172.google.com [209.85.222.172]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D088F241CA5; Fri, 7 Mar 2025 21:58:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.222.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741384737; cv=none; b=QIQ+U5qnRU7boDeIPWgQ/BTUc4UZWygrNWwB6VnASFSQHR/+EeQ6ws8Net2AIl7EbLQNN01gl9P18vSD13Q87ywxcgSSkLfuoNZCIJQ4kVJHjC7O8s1f3woH66964KXEhvuduDf+LS46DcPp5J9u5D/qwRdwc4fguy/ba0RYCcg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741384737; c=relaxed/simple; bh=/DKrhnmPZZIQv+8vQPWliOACuceoct8j/sl5tF1Rz6g=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=aLaWA8faowgOImzZRM9WVdhc5zYfBHkKEOQMxgKnvw7IB6SGPz1fck6jApVwlwn9a57pyDL6xaLVqgZqsbrkfBXltZBeOhhqJ7aMhx1BG72xxlqtvuQaiE55PzPFFNK3vpx15GcHMj4Jk80NnTieq9PBYYFS2Ic+ON/t0CF9/2U= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=J6XcjMM2; arc=none smtp.client-ip=209.85.222.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="J6XcjMM2" Received: by mail-qk1-f172.google.com with SMTP id af79cd13be357-7c3d1b78b93so167057985a.0; Fri, 07 Mar 2025 13:58:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1741384735; x=1741989535; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=pi5cI/LLlwHQg6RvcCMpGvpsOGvk8/oT/vsRBptznRc=; b=J6XcjMM2M8B+A6GvivVMnBFX392lW2rT5jq7uhBeOM62032M02dvreeyZlY0/tHbW/ m6OTn7dntvIUKvgPDmP4ykQ1s36ui60+UAvo+2R9+BjS8g6x2vCyIeW4Sj3JNpWIw1Hz D08pAvoeXijLXvTMzl/4nJACMTfVZ65e2MJal2zkl1jvPoLW67AqKEF0uLnhbfA1m2SU 51yAvF2YFzkhReJAiSrLqV7bHFY69RUvzp8GiMmUmIt8c/WjnhOrN9uplTj3uN5LNM4+ MwekJbWF+GtuRyVBvnw+XJ+uqFq1Yqi0SkdsXBoTgF8nPCNoTI/3ETvcyMEWMjytX4dF 4tQw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1741384735; x=1741989535; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=pi5cI/LLlwHQg6RvcCMpGvpsOGvk8/oT/vsRBptznRc=; b=TFoMrjX5wAzk6+krwjYaxT06qZxSyWaSWE2a+b5+H2efXVeV/UKOJafwA+vW5EcsHp s/K212XJg12l9X+O6e3gKgjWmWZB53Dd2dQoLt1K4yHaHgoMOV0s7XbQISwMJ/97bdtS W3XHrlI1e/OgfFANj6ZoD/jXBSAyWvwCkIeqm+5baFLHof5KG2KUujjaIfQb+G/SRGWr TXNZmuqfqaUEUbaOEGFQxUJoqbvTILfFd1aXCKDnUiTG1S0FEpmScDE3Agd5Jdn6fklP QeDCmhswtbklnjxTzOvgBu/GnOtXN5di7U+GXqUoKs66dBy8p1wz/SnKc/XQRbNRD8X8 sCAg== X-Forwarded-Encrypted: i=1; AJvYcCVyybvF96S4SQZJVFsUWxdnpxgorOe+bijYW6HEUO9FpPgv3NlkSjZ8NNESPuf8gaOIWn4TxarEFo5m@vger.kernel.org, AJvYcCX6JDI4BjkwkK56Ba5Jiv1xGQyaDVCh2H9mNcH4whzA3X89Pm5kMwbrGh0jIb0cSgZi2HURRN0/Bg+2F3o=@vger.kernel.org X-Gm-Message-State: AOJu0YzHC0tztvE9bPJCkVMUZk4AFLrSSj0AdxanYbomOLU+qqk7wLEL Z1B8u8UBkAwHto1428JIUxb5c2TNVhrTPA8nBs3QhouafuV3YGZw X-Gm-Gg: ASbGnctsoUA9BYIJJpwUJMOuFIXQZBtMlRFiJW3EddH3buSgEQ+1yKZ6YOpHeswItIt MZwZ4zTm2hbk6QRy5Gof5J69et+sy8X1HfvMQMLCK7LcXTq2ylUPLTAeQtaUnh+DJ/LRioHXoJK eqE97P4eNfaWXHXDrEfJtbTxXl0/pmbCHl8+VqIqFqjZWNwNipWjBc+xDfHb/edj97+3H1YYNlI ewvPY8BZNowmqT3Sq6yDT65TSbxs/tNuav0TOC8hDL0IriJvCJRKF71WkvQ/nMZH6rGbIdnmRz+ MlqjxGgu8a/ditWukujUoRXokzz1yTRZifZemtltRbjrCcdguIGeibQXkdItam/HCrYrI2trTVC 3Y+iAhg== X-Google-Smtp-Source: AGHT+IEn6eaklWfFbYG9BMbTxey++4gqPUxT+6qQxC4MqEDmQ8eJRUPM9y8mXMbq5l8lfnbVjBw9Og== X-Received: by 2002:a05:620a:4885:b0:7c3:d314:7238 with SMTP id af79cd13be357-7c4e61a0c12mr837645285a.49.1741384734601; Fri, 07 Mar 2025 13:58:54 -0800 (PST) Received: from 1.0.0.127.in-addr.arpa ([2600:4041:5be7:7c00:f0dd:49a0:8ab6:b3b6]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7c3e533a481sm293735085a.13.2025.03.07.13.58.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 07 Mar 2025 13:58:54 -0800 (PST) From: Tamir Duberstein Date: Fri, 07 Mar 2025 16:58:49 -0500 Subject: [PATCH 2/2] rust: workqueue: remove HasWork::OFFSET Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250307-no-offset-v1-2-0c728f63b69c@gmail.com> References: <20250307-no-offset-v1-0-0c728f63b69c@gmail.com> In-Reply-To: <20250307-no-offset-v1-0-0c728f63b69c@gmail.com> To: Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Bjorn Helgaas , Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich Cc: rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, Tamir Duberstein X-Mailer: b4 0.15-dev Implement `HasWork::work_container_of` in `impl_has_work!`, narrowing the interface of `HasWork` and replacing pointer arithmetic with `container_of!`. Remove the provided implementation of `HasWork::get_work_offset` without replacement; an implementation is already generated in `impl_has_work!`. Remove the `Self: Sized` bound on `HasWork::work_container_of` which was apparently necessary to access `OFFSET` as `OFFSET` no longer exists. A similar API change was discussed on the hrtimer series[1]. Link: https://lore.kernel.org/all/20250224-hrtimer-v3-v6-12-rc2-v9-1-5bd3bf0ce6cc@kernel.org/ [1] Signed-off-by: Tamir Duberstein --- rust/kernel/workqueue.rs | 45 ++++++++++++--------------------------------- 1 file changed, 12 insertions(+), 33 deletions(-) diff --git a/rust/kernel/workqueue.rs b/rust/kernel/workqueue.rs index 0cd100d2aefb..0e2e0ecc58a6 100644 --- a/rust/kernel/workqueue.rs +++ b/rust/kernel/workqueue.rs @@ -429,51 +429,23 @@ pub unsafe fn raw_get(ptr: *const Self) -> *mut bindings::work_struct { /// /// # Safety /// -/// The [`OFFSET`] constant must be the offset of a field in `Self` of type [`Work`]. The -/// methods on this trait must have exactly the behavior that the definitions given below have. +/// The methods on this trait must have exactly the behavior that the definitions given below have. /// /// [`impl_has_work!`]: crate::impl_has_work -/// [`OFFSET`]: HasWork::OFFSET pub unsafe trait HasWork { - /// The offset of the [`Work`] field. - const OFFSET: usize; - - /// Returns the offset of the [`Work`] field. - /// - /// This method exists because the [`OFFSET`] constant cannot be accessed if the type is not - /// [`Sized`]. - /// - /// [`OFFSET`]: HasWork::OFFSET - #[inline] - fn get_work_offset(&self) -> usize { - Self::OFFSET - } - /// Returns a pointer to the [`Work`] field. /// /// # Safety /// /// The provided pointer must point at a valid struct of type `Self`. - #[inline] - unsafe fn raw_get_work(ptr: *mut Self) -> *mut Work { - // SAFETY: The caller promises that the pointer is valid. - unsafe { (ptr as *mut u8).add(Self::OFFSET) as *mut Work } - } + unsafe fn raw_get_work(ptr: *mut Self) -> *mut Work; /// Returns a pointer to the struct containing the [`Work`] field. /// /// # Safety /// /// The pointer must point at a [`Work`] field in a struct of type `Self`. - #[inline] - unsafe fn work_container_of(ptr: *mut Work) -> *mut Self - where - Self: Sized, - { - // SAFETY: The caller promises that the pointer points at a field of the right type in the - // right kind of struct. - unsafe { (ptr as *mut u8).sub(Self::OFFSET) as *mut Self } - } + unsafe fn work_container_of(ptr: *mut Work) -> *mut Self; } /// Used to safely implement the [`HasWork`] trait. @@ -504,8 +476,6 @@ macro_rules! impl_has_work { // SAFETY: The implementation of `raw_get_work` only compiles if the field has the right // type. unsafe impl$(<$($generics)+>)? $crate::workqueue::HasWork<$work_type $(, $id)?> for $self { - const OFFSET: usize = ::core::mem::offset_of!(Self, $field) as usize; - #[inline] unsafe fn raw_get_work(ptr: *mut Self) -> *mut $crate::workqueue::Work<$work_type $(, $id)?> { // SAFETY: The caller promises that the pointer is not dangling. @@ -513,6 +483,15 @@ unsafe fn raw_get_work(ptr: *mut Self) -> *mut $crate::workqueue::Work<$work_typ ::core::ptr::addr_of_mut!((*ptr).$field) } } + + #[inline] + unsafe fn work_container_of( + ptr: *mut $crate::workqueue::Work<$work_type $(, $id)?>, + ) -> *mut Self { + // SAFETY: The caller promises that the pointer points at a field of the right type + // in the right kind of struct. + unsafe { $crate::container_of!(ptr, Self, $field) } + } } )*}; }