From nobody Tue Feb 10 20:47:10 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 1AA8F36BCE2; Mon, 9 Feb 2026 14:38:53 +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=1770647933; cv=none; b=D6159vZS5t6nhuyTcLGwiMTd5Od2CixP5M+cgUkAN8xnltg1gdQMsPxTHDUSDA979e9ukpeXR8uK16pu/QuNYg/PHouzJ1L6Lmw3njT1MfN5ALK51k3CK/nUxRm/2b3ZIBIDexziPe4PVUW1tS9eVZ5kEArSoW3RqXaHqyfaROo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770647933; c=relaxed/simple; bh=PrcApbk7BCNSPsQwnef2I6IdaZ2i07Y2ln8fzlwV9sQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=VJo40/Fp2hmRhBdR3UrFV7A/RsL75Upz255wj4/CT9nR7TGsx6/zQkcJrQrtBV/UFXqK+BixQ8jngwu23L10/UyNxHCN1GGORxuQGXxcNDQ3IIsPsIRl5EmppwrwUClqyPedMCWOsTsoV8nnyWnOM0ZRe0C61kecMvAUA88h/v8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=MgUYcmvE; 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="MgUYcmvE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8F823C19422; Mon, 9 Feb 2026 14:38:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770647933; bh=PrcApbk7BCNSPsQwnef2I6IdaZ2i07Y2ln8fzlwV9sQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=MgUYcmvEUQ9An1F2rMEYfu+G6E7UYw7TRPeZBzGLNjCdhoccnuiCKATj05xiNBIa5 WW2426/lh800d7CPoGN7MiYWSKlcZbPxcVOUrE18x56MH2iZ21Pz55+lqdDDsaWTCj djG0guEOEV7aSvbwvUkJvz7AM7lJv0ioRrrY86rkFuNoK2Z5nSuN5nMJrkky1Kz5Ty 01oT52B0DvivieFrqElBXFDR5fOB1rpoleTMhAC8zZM8oqL81S3qez8nBVEgR7wHin HdNgoc3Sh59DHy47BYeSBYtXUQEsmpjB799aAYCZuF3sI5CcWKy1/3JTmUOq4fZEG9 XYJYElhzXAdNQ== From: Andreas Hindborg Date: Mon, 09 Feb 2026 15:38:08 +0100 Subject: [PATCH v3 03/12] 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: <20260209-xarray-entry-send-v3-3-f777c65b8ae2@kernel.org> References: <20260209-xarray-entry-send-v3-0-f777c65b8ae2@kernel.org> In-Reply-To: <20260209-xarray-entry-send-v3-0-f777c65b8ae2@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/ZANAwAKAeG4Gj55KGN3AcsmYgBpifFXwEdzwCsucoKq2KE54BrulAwrQmBpO4yTF HcVvqk8u0uJAjMEAAEKAB0WIQQSwflHVr98KhXWwBLhuBo+eShjdwUCaYnxVwAKCRDhuBo+eShj d3PQD/oDY7iFQvP7waZGcxclTVtbgYcbDsPw2BXqzs4G4r0nEmsZ/bc3z3fctpmk5Eu4QBQBSmz GquJbOx7DS+XXhyisG/lSfDSZTcjM3B7djaHs6kv2X2GpCaUTA1D7we6YKiCLNQKKWSz8rPBedH AS0WmyqMBJGsnjNcTB6ho2HB80mJuc87vpqgnong594U46aZH98gBMZjCR3WL+eFNZlbl2hFTQZ Yxi8R/7glxzu6qhJhL1OVS2sNimeBM2TsYuj5g0a8QJCrRnNqOJum1BMAeieTDDW0j+3gnn1IOp k4kdrK3jzQ6DLIQiKbLvV/dsCJ1qX8+wny8gwKWuB4f19wSKV55RUPzmUnlH/qMQdKK0ucjZEH0 yXg1X/DtCzjDdp4cTqS90gIquSlMVVcyZurN06hK/O8WdYHh/crxpDtb7Wtq3HHrsxnMTppHeK+ H5iFzc0pNaUVCFYuMEDzDv3EnVGt2uGtkQE37lz8ttk2jGr2WdhUnR0ARFRLItdTm5SXRml0ayX cwBs5jBKuS70hr93mo9OvR/zboRwQUqq18WdAk5owQSaAEiwN0H5I49xml/jOydbTFc5S1udD5D QbYxPkEFxloK1KgcD15RJX98bVmLwNWlICo9n9iBiD+TPmMsnMIkqWVNHgThONOrkFG1q6/6SO/ 7naUgNlrGsokBFA== 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 Reviewed-by: Daniel Gomez --- 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