From nobody Mon Oct 6 08:29:07 2025 Received: from out-186.mta1.migadu.com (out-186.mta1.migadu.com [95.215.58.186]) (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 247D52C15B7 for ; Thu, 24 Jul 2025 09:25:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.186 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753349156; cv=none; b=CjllvxaQ9WR9KBLlwbwYbuzJRGUF4Pl+l9FeZQfkOjFKr8acOIq72j3iz4qQx9SJha7H8P9XvTlh1wpht0D/R6Dea1YHGxXC+KcERZgeqEK4gYoM17hPbK5F7L6iUAD0dsdKsrVbX0v2pcxcpjIQdOPPDBDemZkXGIDUebqF26E= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753349156; c=relaxed/simple; bh=CdaYOnb1fT0dOSjxWvCijusOmY1anMO+IiPPIZ2HYKA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ZdiODOxEk8JjZF81hLbPQLcXQ7piD3sqhQyIpo/iGbT8InWhp7fvZVpprcGrwpSwikTxJsu5Uao/GUXOMfYVRSgnp/fS+JzVZ1mrfJvOz2SyltLLqdPpLl4R34KqCUJPgF/K//rVzuplATaMNScqheB5P61l09ea4PjbLn/sF7I= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=afGEQALB; arc=none smtp.client-ip=95.215.58.186 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="afGEQALB" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1753349152; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=aclP+/7iJas2ebXPYU6OTuB0cYx+hB/y7RGCUOBq25M=; b=afGEQALBgX7XgFeC04pt3kJPDmJBrS2iDh7FMqMppO0s8lscq5Ad8msLEDQKIc3HKxTWZC Soidzmh0eHwpz9CUwcnRbRFZ4x0wReHnfKLTN0W13FUPo4EiJo0HO4KH5AQmj0RkdLGRNi nlpzErsaCjd3FqAA8YL4U/LfdGs32oo= From: Hui Zhu To: Danilo Krummrich , Lorenzo Stoakes , Vlastimil Babka , "Liam R . Howlett" , Uladzislau Rezki , Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , bjorn3_gh@protonmail.com, Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Hui Zhu , Geliang Tang Subject: [PATCH v4 1/2] rust: allocator: add unit tests of kmalloc, vmalloc and kvmalloc Date: Thu, 24 Jul 2025 17:25:34 +0800 Message-Id: <32d7663b7d07d13564bdfb6a1ec4cde1be8b8f80.1753348867.git.zhuhui@kylinos.cn> In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" From: Hui Zhu Add KUnit test cases to validate the functionality of Rust allocation wrappers (kmalloc, vmalloc, kvmalloc). The tests include: Basic allocation tests for each allocator using a 1024-byte Blob structure initialized with a 0xfe pattern. Large alignment (> PAGE_SIZE) allocation testing using an 8192-byte aligned LargeAlignBlob structure. Verification of allocation constraints: - kmalloc successfully handles large alignments. - vmalloc and kvmalloc correctly fail for unsupported large alignments. Content verification through byte-by-byte pattern checking. Co-developed-by: Geliang Tang Signed-off-by: Geliang Tang Signed-off-by: Hui Zhu --- rust/kernel/alloc/allocator.rs | 57 ++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) diff --git a/rust/kernel/alloc/allocator.rs b/rust/kernel/alloc/allocator.rs index aa2dfa9dca4c..430d1f664fdf 100644 --- a/rust/kernel/alloc/allocator.rs +++ b/rust/kernel/alloc/allocator.rs @@ -187,3 +187,60 @@ unsafe fn realloc( unsafe { ReallocFunc::KVREALLOC.call(ptr, layout, old_layout, flag= s) } } } + +#[macros::kunit_tests(rust_allocator_kunit)] +mod tests { + use super::*; + use kernel::prelude::*; + + const TEST_SIZE: usize =3D 1024; + const LARGE_ALIGN_TEST_SIZE: usize =3D kernel::page::PAGE_SIZE * 4; + #[repr(align(128))] + struct Blob([u8; TEST_SIZE]); + // This structure is used to test the allocation of alignments larger + // than PAGE_SIZE. + // Since this is not yet supported, avoid accessing the contents of + // the structure for now. + #[allow(dead_code)] + #[repr(align(8192))] + struct LargeAlignBlob([u8; LARGE_ALIGN_TEST_SIZE]); + + #[test] + fn test_kmalloc() -> Result<(), AllocError> { + let blob =3D KBox::new(Blob([0xfeu8; TEST_SIZE]), GFP_KERNEL)?; + for b in blob.0.as_slice().iter() { + assert_eq!(*b, 0xfeu8); + } + + let blob =3D KBox::new(LargeAlignBlob([0xfdu8; LARGE_ALIGN_TEST_SI= ZE]), GFP_KERNEL)?; + for b in blob.0.as_slice().iter() { + assert_eq!(*b, 0xfdu8); + } + + Ok(()) + } + + #[test] + fn test_vmalloc() -> Result<(), AllocError> { + let blob =3D VBox::new(Blob([0xfeu8; TEST_SIZE]), GFP_KERNEL)?; + for b in blob.0.as_slice().iter() { + assert_eq!(*b, 0xfeu8); + } + + assert!(VBox::::new_uninit(GFP_KERNEL).is_err()); + + Ok(()) + } + + #[test] + fn test_kvmalloc() -> Result<(), AllocError> { + let blob =3D KVBox::new(Blob([0xfeu8; TEST_SIZE]), GFP_KERNEL)?; + for b in blob.0.as_slice().iter() { + assert_eq!(*b, 0xfeu8); + } + + assert!(KVBox::::new_uninit(GFP_KERNEL).is_err()); + + Ok(()) + } +} --=20 2.43.0