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 DF16E2E2F0E; Wed, 3 Dec 2025 22:27:52 +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=1764800873; cv=none; b=i/8KjgYnwU0IyTHvGuArHm6CfJk6DMpVx4YTVGN4B1UO2UptCIV5Idwq6u/sHkicTtD0ggIqix7m+FBnrQzw5VAezLg9u249WwR+QL1HTUxGmf1ADdP9PKZfZnsUnpQ6h4vTIYMMAmcwmF6mgEAc+T5XNxF8GZsws/dTgE2/eEY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764800873; c=relaxed/simple; bh=PrcApbk7BCNSPsQwnef2I6IdaZ2i07Y2ln8fzlwV9sQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=mq578Jee8mPr3qbakykzYkf9U9yGVYBXrhmjpquYRq0E7SIvt93iufjWwQlM8sJELft+ccU8BsTUo37GNmBUbpy4KCtH2su1N+syRHTNlengV9RIim7/df1B8/wJRDJqbBjvIvnTK9C6N8kjAkNn79HWmaqX1BdpIePaiHEaaME= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=m0jP/Ud0; 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="m0jP/Ud0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AD64DC4CEFB; Wed, 3 Dec 2025 22:27:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1764800872; bh=PrcApbk7BCNSPsQwnef2I6IdaZ2i07Y2ln8fzlwV9sQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=m0jP/Ud0yOa10gIlxWprE9/j4xwsLyPG4pp22VYwn3LR9gbwlytJlZWvZ7/XHTZJT 5XQGVla9xE7q+Ug1Lo8oLaocWIfC4OOjZLDJuRhr5+wTLEw7X2WivNgZTmUjWhqNX/ QZZF9So8QuldZOau1jhj/tid0JtrIjF/ebVq28vG0bLc8KvGZwzTznNadD9JpEyUwR rFzKB+hwrJV84gID6ajzUQZCt/Pwpq4gOgKE+20x62Iy3e3ZH9oYn5Jt/C5f5Xx8iD dkLqy83j6Q+qlili/Cfm1BrKltw4kAOowq+AM0QbORrEkPjkBEKz3LRAs9m/ehf02h RtwuNtKsI7MyQ== From: Andreas Hindborg Date: Wed, 03 Dec 2025 23:26:33 +0100 Subject: [PATCH 03/10] rust: xarray: add `contains_index` method 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: <20251203-xarray-entry-send-v1-3-9e5ffd5e3cf0@kernel.org> References: <20251203-xarray-entry-send-v1-0-9e5ffd5e3cf0@kernel.org> In-Reply-To: <20251203-xarray-entry-send-v1-0-9e5ffd5e3cf0@kernel.org> To: Tamir Duberstein , Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Alice Ryhl , Trevor Gross , Danilo Krummrich Cc: Daniel Gomez , 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=1538; i=a.hindborg@kernel.org; h=from:subject:message-id; bh=PrcApbk7BCNSPsQwnef2I6IdaZ2i07Y2ln8fzlwV9sQ=; b=owEBbQKS/ZANAwAKAeG4Gj55KGN3AcsmYgBpMLkstUvW7+YPAChWwj2PNQcLbewxGouH19f/x ZM8ruj3xGSJAjMEAAEKAB0WIQQSwflHVr98KhXWwBLhuBo+eShjdwUCaTC5LAAKCRDhuBo+eShj d5sGD/9g3byBD9oFAUj6QRSDtU1XnB2ifRdbJ/bCAiFS1M+C/K9xEDjhpCpi8kfWMpl4xpAtUSZ Lp5nFt6y6h0TYfUkuKKjuo8ONYHFh6TFrScqjpAWParm5hc69KAuAWDs5ZUs7pDO+taJSsVhWnG mZzk0wj5DltOSfE7kvek01rU4CcRW/q8FXNEorxC5VZ4Qo8qWtKGLQ6w1ADL7otDa/b2mkYdvMa ZEfEZ4vX4oUsomz6Hv55j6I9JR6HyQ4BKN2nmhwpjzO/zJkpywbcoBxt2mGF1RilEym+EtbTiP5 o5UuY5MsFvX6T24QcgUPgOdSy4vpGQ8Mm2Tv6XHQOpan4Js3sxftjoI238TCzc3B9X03MaEft4G qSV4mOJW1v+J4q9Xee+uGEWcvCsFlvLBSlzRMQO28wk52p4yTKapAgfianXpSeAsHmHCzePalm2 eF/hWIUIbt9RiaQxbxjH/CkrHxINK9ynesAaLli2ODcvuclepJfn1jFcxMeRETXVsWPKFXzNOWc CMBqV2lLXZkz8L75TBWaCbWyHXOwCO5LvtfIfH4IiJhbXnJqbnFbNb2x19RralZSet1QlM5Dqb7 zCaaMAMqztcR6cvBowZkTsXqfQJUwobUIt49gQpMmWgNKiwW2Z7M5OFgtQdka3tuAVLl1K5MkD8 xMmnQgeGSBafjng== X-Developer-Key: i=a.hindborg@kernel.org; a=openpgp; fpr=3108C10F46872E248D1FB221376EB100563EF7A7 Add a convenience method `contains_index` to check whether an element exists at a given index in the XArray. This method provides a more ergonomic API compared to calling `get` and checking for `Some`. Signed-off-by: Andreas Hindborg --- rust/kernel/xarray.rs | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/rust/kernel/xarray.rs b/rust/kernel/xarray.rs index d9762c6bef19c..ede48b5e1dba3 100644 --- a/rust/kernel/xarray.rs +++ b/rust/kernel/xarray.rs @@ -218,6 +218,27 @@ fn load(&self, index: usize, f: F) -> Option Some(f(ptr)) } + /// Checks if the XArray contains an element at the specified index. + /// + /// # Examples + /// + /// ``` + /// # use kernel::{alloc::{flags::GFP_KERNEL, kbox::KBox}, xarray::{AllocKind, XArray}}; + /// let xa = KBox::pin_init(XArray::new(AllocKind::Alloc), GFP_KERNEL)?; + /// + /// let mut guard = xa.lock(); + /// assert_eq!(guard.contains_index(42), false); + /// + /// guard.store(42, KBox::new(0u32, GFP_KERNEL)?, GFP_KERNEL)?; + /// + /// assert_eq!(guard.contains_index(42), true); + /// + /// # Ok::<(), kernel::error::Error>(()) + /// ``` + pub fn contains_index(&self, index: usize) -> bool { + self.get(index).is_some() + } + /// Provides a reference to the element at the given index. pub fn get(&self, index: usize) -> Option> { self.load(index, |ptr| { -- 2.51.2