From mboxrd@z Thu Jan 1 00:00:00 1970 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 588F3227BA5; Mon, 9 Jun 2025 22:46:43 +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=1749509205; cv=none; b=T9h2xzfBPe1B6e9CLtMR/hNS+1yDr9dwI8NRbOiyIOj9dMaYIXK/wF7FbBS1uUQYXCcbwO5aM/6Foqw46b968IsEIBXEcmQC9YVImU7NbX+/koINozFCveMDNb9Yc53M+9cYmgAj5HfWeYatkrMZZCU+zRVQEXuyZuKFcHueBNc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749509205; c=relaxed/simple; bh=3t90svxWEHL37ohE0fJHFmRBiBXjgm3lFXGoX5OddKc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=srSiVJX09EzJbHbMZgSB64ZAU0s+pxqPLdlEm8Bc1NNbuBDaeyoVNQXJbDbPb8Lie17aI3AxW4cGP+IEmsXaWqBvW2Ua3bdZ30gAxTFXpIvT9FaUcJQYFTvCAUnAq+Wbx2+6q+4fCqwZ7sTY3/zhOOoiTSgSulWx4VoncQDwNow= 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=fF6BRhOc; 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="fF6BRhOc" Received: by mail-qk1-f172.google.com with SMTP id af79cd13be357-7d09f11657cso457383285a.0; Mon, 09 Jun 2025 15:46:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1749509202; x=1750114002; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:feedback-id:from:to:cc:subject :date:message-id:reply-to; bh=Ykfv0JUDwfNHM9Hye+0iZ2AUZ2hpC7+5v9dE8kxQRZU=; b=fF6BRhOcC/eDx6KPpd7jMxDCCcrVboMTEO17iUgrOU3hiTxapAmBHgzkEFRMvOxQjd q2RNaxXDS9AxQQdUwUESzVu9LUXIUATBSgfWnO1qXaFKaJ49BQ8GfQ6UX3rmeZw+TyE3 H+cf92B51C5dtUCFfrldkzY5J9e5+ok6M/T+wxmmOZo11a2gg1vH1RXI1IT8t3NVEsrM Es44lL4UEQd8WdzlRRoruTFW1rnqHY/xzm8zO6mMexXMa/AF9M8S3Pah/aDNkIOrHcza jwGCVMlFZQ4F4Lw8VDDjArWZ76HcCVmdadfbsAmiZEpPeyyox6CsuKnZKoVFM02rnJvF c7ww== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1749509202; x=1750114002; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:feedback-id:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=Ykfv0JUDwfNHM9Hye+0iZ2AUZ2hpC7+5v9dE8kxQRZU=; b=QUdu6VP6EiT/kgyPRneGQ84z6pA/XBvURHOaAWqkL22kuMshoaFiczTfSn5WzZpiSl c2Y9j6aAES8aA/ES/guOuvq5KdsGpNBBQ0LXBwrTtbsCODe+3yccY/puAOvxxxo4Uwxo aY60xeTZJDMHhIo1w+gE1L2zJR8Uq5KiJifKnCnpo7DLYaxYbiyxZRYtSH7UeB6U8Zs9 sZAfl2tzBdJbVZU1v8fb6UEwKcjf+/ADbr3OJTd9PG1hHyHZcTaK+ZrLbITqf//HIPK3 c+XIoctHCdXwbJ38HSyHNkFB/x17F9Wj1lxsVHJ/GkiIWVv6iHbZhNFrPK44W6q7X2oj Bozw== X-Forwarded-Encrypted: i=1; AJvYcCUUGiYs1+ihpwzESi+yio4lrWr7ICL4XJiuHBr/TtLNJtkGkA7o8Oty67Ah0G91dS1vfcOCYgJ9aJ2x1ndo1og=@vger.kernel.org, AJvYcCWjVHEjhoLQsaDY5V8WZRZm634RXrIciZmBVmEFWWEgDNV3fo/I5MWhUONJ43okwHIR3T+WEzmhgStU@vger.kernel.org X-Gm-Message-State: AOJu0YwYGiHXF2EKYd+a1vbKpBqYiIZT5EDg6fWXLwSgaEDMBA+aW+Iu vJPfhhA53CuHSbYIVO4qEVf55xvtmOwVIFx4VK0Nyl1w+S2bixi6Mxvz X-Gm-Gg: ASbGnctNbxQkW9CYS0GpAKoP6vc1fHorI0HWDYI9AKSj5Exqfzs3gLup60bz1OF5qRY FOJ9T9oHjL2RuKKgTUd7TD8H0jdrLAgXanK9G90/DSWQWj9uO4UwOl5Q944P6P9o03UAV3pyBT/ 2Gbl6Avj/U0FukCJsmnd9f/H3k+mS6foatk3lNtVub1n6TzochRFTOlH79eXTJM+qBmpcv6RI5M Prx4VGv4n3aBDv/mz7i1cY/E0otbbfPQvW5xq7ht63SyCK+mft9K8UwFE+gmASb4Tp+EOonVzEZ j36h1jUwhWd3w8JJTjBHgzYE2t3qPj31famG0/Ks3jvBRSM2MLsEvv+pSo91odpbPGbRVj2oNTJ nllL7wgjMmkD12iC6r3hSD1z9bSiWfME0lZaPajUhrtTGZuKINrbb X-Google-Smtp-Source: AGHT+IFUi/CH1qbuTMavhtVevTlVgWxfuQBtFoEfwJqR6HTbU+n+FxJv1MMM0BL61L4p6Kak/iTk1Q== X-Received: by 2002:a05:620a:29c9:b0:7c7:694e:1ba0 with SMTP id af79cd13be357-7d2298d6f08mr2328173785a.44.1749509202149; Mon, 09 Jun 2025 15:46:42 -0700 (PDT) Received: from fauth-a2-smtp.messagingengine.com (fauth-a2-smtp.messagingengine.com. [103.168.172.201]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6fb09aba071sm57749346d6.24.2025.06.09.15.46.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Jun 2025 15:46:41 -0700 (PDT) Received: from phl-compute-09.internal (phl-compute-09.phl.internal [10.202.2.49]) by mailfauth.phl.internal (Postfix) with ESMTP id 459101200043; Mon, 9 Jun 2025 18:46:41 -0400 (EDT) Received: from phl-mailfrontend-01 ([10.202.2.162]) by phl-compute-09.internal (MEProxy); Mon, 09 Jun 2025 18:46:41 -0400 X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeeffedrtddugdelleduucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdggtfgfnhhsuhgsshgtrhhisggvpdfu rfetoffkrfgpnffqhgenuceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnh htshculddquddttddmnecujfgurhephffvvefufffkofgjfhgggfestdekredtredttden ucfhrhhomhepuehoqhhunhcuhfgvnhhguceosghoqhhunhdrfhgvnhhgsehgmhgrihhlrd gtohhmqeenucggtffrrghtthgvrhhnpeegleejiedthedvheeggfejveefjeejkefgveff ieeujefhueeigfegueehgeeggfenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmh epmhgrihhlfhhrohhmpegsohhquhhnodhmvghsmhhtphgruhhthhhpvghrshhonhgrlhhi thihqdeiledvgeehtdeigedqudejjeekheehhedvqdgsohhquhhnrdhfvghngheppehgmh grihhlrdgtohhmsehfihigmhgvrdhnrghmvgdpnhgspghrtghpthhtohepvdeipdhmohgu vgepshhmthhpohhuthdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrd hkvghrnhgvlhdrohhrghdprhgtphhtthhopehruhhsthdqfhhorhdqlhhinhhugiesvhhg vghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlkhhmmheslhhishhtshdrlhhinh hugidruggvvhdprhgtphhtthhopehlihhnuhigqdgrrhgthhesvhhgvghrrdhkvghrnhgv lhdrohhrghdprhgtphhtthhopehojhgvuggrsehkvghrnhgvlhdrohhrghdprhgtphhtth hopegrlhgvgidrghgrhihnohhrsehgmhgrihhlrdgtohhmpdhrtghpthhtohepsghoqhhu nhdrfhgvnhhgsehgmhgrihhlrdgtohhmpdhrtghpthhtohepghgrrhihsehgrghrhihguh hordhnvghtpdhrtghpthhtohepsghjohhrnhefpghghhesphhrohhtohhnmhgrihhlrdgt ohhm X-ME-Proxy: Feedback-ID: iad51458e:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Mon, 9 Jun 2025 18:46:40 -0400 (EDT) From: Boqun Feng To: linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, lkmm@lists.linux.dev, linux-arch@vger.kernel.org Cc: Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Will Deacon , Peter Zijlstra , Mark Rutland , Wedson Almeida Filho , Viresh Kumar , Lyude Paul , Ingo Molnar , Mitchell Levy , "Paul E. McKenney" , "Greg Kroah-Hartman" , Linus Torvalds , "Thomas Gleixner" Subject: [PATCH v4 07/10] rust: sync: atomic: Add Atomic Date: Mon, 9 Jun 2025 15:46:12 -0700 Message-Id: <20250609224615.27061-8-boqun.feng@gmail.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20250609224615.27061-1-boqun.feng@gmail.com> References: <20250609224615.27061-1-boqun.feng@gmail.com> Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add generic atomic support for basic unsigned types that have an `AtomicImpl` with the same size and alignment. Unit tests are added including Atomic and Atomic. Signed-off-by: Boqun Feng --- rust/kernel/sync/atomic.rs | 83 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) diff --git a/rust/kernel/sync/atomic.rs b/rust/kernel/sync/atomic.rs index a01e44eec380..9039591b4d46 100644 --- a/rust/kernel/sync/atomic.rs +++ b/rust/kernel/sync/atomic.rs @@ -22,3 +22,86 @@ pub use generic::Atomic; pub use ordering::{Acquire, Full, Relaxed, Release}; + +// SAFETY: `u64` and `i64` has the same size and alignment. +unsafe impl generic::AllowAtomic for u64 { + type Repr = i64; + + fn into_repr(self) -> Self::Repr { + self as _ + } + + fn from_repr(repr: Self::Repr) -> Self { + repr as _ + } +} + +impl generic::AllowAtomicArithmetic for u64 { + type Delta = u64; + + fn delta_into_repr(d: Self::Delta) -> Self::Repr { + d as _ + } +} + +// SAFETY: `u32` and `i32` has the same size and alignment. +unsafe impl generic::AllowAtomic for u32 { + type Repr = i32; + + fn into_repr(self) -> Self::Repr { + self as _ + } + + fn from_repr(repr: Self::Repr) -> Self { + repr as _ + } +} + +impl generic::AllowAtomicArithmetic for u32 { + type Delta = u32; + + fn delta_into_repr(d: Self::Delta) -> Self::Repr { + d as _ + } +} + +use crate::macros::kunit_tests; + +#[kunit_tests(rust_atomics)] +mod tests { + use super::*; + + // Call $fn($val) with each $type of $val. + macro_rules! for_each_type { + ($val:literal in [$($type:ty),*] $fn:expr) => { + $({ + let v: $type = $val; + + $fn(v); + })* + } + } + + #[test] + fn atomic_basic_tests() { + for_each_type!(42 in [i32, i64, u32, u64] |v| { + let x = Atomic::new(v); + + assert_eq!(v, x.load(Relaxed)); + }); + } + + #[test] + fn atomic_arithmetic_tests() { + for_each_type!(42 in [i32, i64, u32, u64] |v| { + let x = Atomic::new(v); + + assert_eq!(v, x.fetch_add(12, Full)); + assert_eq!(v + 12, x.load(Relaxed)); + + x.add(13, Relaxed); + + assert_eq!(v + 25, x.load(Relaxed)); + }); + } +} -- 2.39.5 (Apple Git-154)