From nobody Sat Feb 7 23:24:15 2026 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 282B831352F; Fri, 6 Feb 2026 21:11:35 +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=1770412296; cv=none; b=LdQBme4gdpNRixI1XskuOqonCFTEU+FnNJ5YS+lXxYtL4VF8AR0B0+x7funzCaCFL7niKZOO/WUMk5adTqaTYWDSz4KhMjlnKw3IHyzNsL9gCYXChpTCm+s1tkr8CaPvRiVkaQfKI0X+4PhFICFk5/eR4IC/wdbGDpl1qNDl6/A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770412296; c=relaxed/simple; bh=PrcApbk7BCNSPsQwnef2I6IdaZ2i07Y2ln8fzlwV9sQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=cV/tsSjP6jauulWv5E8ePYT8o64dqje4gz4ooUO91tRUXhclnwbk1mc6+8uRdCBi9CFlKW5EWld8p4QlSNOE/sDOAIofvUZ9wWGA6EAlSGBWiHugmWA9W52MjPjtTYpeua8IyyswQ0VjSlnfuexnl8pS2i2qU/HGbaSTdkCrTaw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=HQqlC174; 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="HQqlC174" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3089EC16AAE; Fri, 6 Feb 2026 21:11:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770412295; bh=PrcApbk7BCNSPsQwnef2I6IdaZ2i07Y2ln8fzlwV9sQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=HQqlC174WwKjwtjLP1BUTMoxieROheLgxdft+OGqysEcip0EvNQ1MMicLZBsg6Ygl 0iHMxOT9CHUgO55F77L5XNmNSzdo81rEEkzGE8xd5XuR6dcrtxvo41iJmz0jZbvVi/ /FmqFiqb4mU+1saT1ogpOGPmK9eg+Wcu12rbxKwb/QuDF6Z0bdlVNhtRICOa91zibI AIIEZ1BL3GbaC1kvTZ2uVx1GtrsSirEUpeT+AWr9yXPjeC/cU67gaWt6VMSh06H69b KgYPNteuFvt6eYQY5iRbMOTdIXUD5GbtjQlWL4kd1XifwIFIYNRcae9LeIdBkEE6kW JUi5yQkVOrlvw== From: Andreas Hindborg Date: Fri, 06 Feb 2026 22:10:49 +0100 Subject: [PATCH v2 03/11] rust: xarray: add `contains_index` method 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: <20260206-xarray-entry-send-v2-3-91c41673fd30@kernel.org> References: <20260206-xarray-entry-send-v2-0-91c41673fd30@kernel.org> In-Reply-To: <20260206-xarray-entry-send-v2-0-91c41673fd30@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 , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Andrew Morton , Christoph Lameter , David Rientjes , Roman Gushchin , Harry Yoo Cc: Daniel Gomez , rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.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/ZANAwAKAeG4Gj55KGN3AcsmYgBphljjynnLtfrU8Iiz9Gm5FPAFGgN+NLu89L3zu FUdyPDQUsCJAjMEAAEKAB0WIQQSwflHVr98KhXWwBLhuBo+eShjdwUCaYZY4wAKCRDhuBo+eShj d1WtD/0dSV1caS9hKFf19rq5n4cibJ7yErP+DuvjTNfhG+cx9BGtQf/Ivg9WhmB6dKF1/Ff/ZNE fD7LuuYM708jMZ/Ag3QLJ6bZhYFCBVFMXU7uc1O6puBKeYx/LAuPoocpO5LcFPP/bt1ZEw8WUF0 m7zzmtHnXb+6ujkjd2gl6hBhGgSgOGhvdJyYX3ULUUkVXe8vN5TpwXq/IlUw+Os6dWO0Z8QNI9L 49N/R7i9NuiZ19l2L7xKVsv9nEZmAAA6gJmAdAoeINuz0Q+e9PxyqMi9Ew1aBErPXVPOxMOchq7 4ohQLw/lItGvp12xabHAIbxlKUV9FMDxccovc/mki8TucfkGlQtmlMhLwGS+iQtmMw6havc9ndR Pf5qTpoqj69CNxpXyvsSUWI+xc49m7weMQ8a5zeIO/g2XlBsFrLQwnVtrhsHGKtxqg4Qo02NclV CmO6qLnLmsf4hNzCsYGRhK5mdwew7WujEbd5hlufx+YNqZ6a8kGCXRhAvh0c2OPAgDXd0RCHtnG Qy4kA65FWIqUx5woBVUWuCup53T3cNzSUyNmaXvwWMoXZyaDn7aJaQ+HLJyHHR3bZ7tqvodt018 KGZAdtO2i563HF4hHXqFw6msci9S/h4ojJZJCwvUaxYItpXWU1zcyOWq3rFcLZwLhGoZnQSJbel nenKo4yG1+Wh9Yw== 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)) } =20 + /// Checks if the XArray contains an element at the specified index. + /// + /// # Examples + /// + /// ``` + /// # use kernel::{alloc::{flags::GFP_KERNEL, kbox::KBox}, xarray::{Al= locKind, XArray}}; + /// let xa =3D KBox::pin_init(XArray::new(AllocKind::Alloc), GFP_KERNE= L)?; + /// + /// let mut guard =3D 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| { --=20 2.51.2