From nobody Thu Nov 28 14:47:09 2024 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 31E701CF283; Tue, 1 Oct 2024 15:02:37 +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=1727794957; cv=none; b=G31OC1qzl2Tajj4qDFUWjLcYtSK4DGyofC0hJSMF29k3+n9X1EpYrRYx2IT8dyqkwKB9TbIu5kI+l3UsqrHBQA98NittnzRJbOjk/YRSAmlK9sUtXUvSzSkxmlQMiv5CnXb7NsoK+1fQL71qjDF3D6vW6xoRCYXTOuGTYHmFTdw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727794957; c=relaxed/simple; bh=rMRoTLbwJY/KNbnwZeqVlUvQeXlcU9VSnqsWXV9nz8g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=tMfwXAt1+NN2ljEeNa6cWjFPNzogY80HhXAT7E2XWwZa1N3b5S7YldPvnXIuAabd3ZUFypmRfV5qAf4BSxUzjxaL2LZPTicXENMn8XUihdXxkezODJZ4JTgp+dGfkDFMFWFhsf4tPtPO5/Q0uayaaHj6/jo8luWYhR52YvYevnQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=r1xNcO7w; 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="r1xNcO7w" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 226F6C4CECD; Tue, 1 Oct 2024 15:02:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1727794957; bh=rMRoTLbwJY/KNbnwZeqVlUvQeXlcU9VSnqsWXV9nz8g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=r1xNcO7wmDj+pX9zXKSF5zGwWUM4O85kJZ5cWPAxgO9+xb910r5UXJlLXxC1BXTUT zzBp0tTw/b1CeJHxrZy8zQ/bdjKcIOnTq8eOvJIpeXw1cMsIqUvNt3L7SIRSn61PTl ULpwj3RBaA4YjI5NczO3MZgxSOju7nslA/iHjIWPgpSrQwMOvY7je1ZvCyoage2RRw DsL33UucQCuqwoMwJtQaQmGtNWSnzyiAGCJPNjlAEeuoZGEE8Di3jHuGZ+YB5HwTSW 2uu10sTfzzqUOW5Can8mKlVOL3Q76hTPPjmlVHG5LSSsr9tPb5YkMuuza15LjJbHWB hsHNBft18qx1A== From: Danilo Krummrich To: ojeda@kernel.org, alex.gaynor@gmail.com, wedsonaf@gmail.com, boqun.feng@gmail.com, gary@garyguo.net, bjorn3_gh@protonmail.com, benno.lossin@proton.me, a.hindborg@samsung.com, aliceryhl@google.com, akpm@linux-foundation.org Cc: daniel.almeida@collabora.com, faith.ekstrand@collabora.com, boris.brezillon@collabora.com, lina@asahilina.net, mcanal@igalia.com, zhiw@nvidia.com, cjia@nvidia.com, jhubbard@nvidia.com, airlied@redhat.com, ajanulgu@redhat.com, lyude@redhat.com, linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-mm@kvack.org, Danilo Krummrich Subject: [PATCH v8 26/29] rust: str: test: replace `alloc::format` Date: Tue, 1 Oct 2024 17:00:01 +0200 Message-ID: <20241001150008.183102-27-dakr@kernel.org> X-Mailer: git-send-email 2.46.1 In-Reply-To: <20241001150008.183102-1-dakr@kernel.org> References: <20241001150008.183102-1-dakr@kernel.org> 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 Content-Type: text/plain; charset="utf-8" The current implementation of tests in str.rs use `format!` to format strings for comparison, which, internally, creates a new `String`. In order to prepare for getting rid of Rust's alloc crate, we have to cut this dependency. Instead, implement `format!` for `CString`. Note that for userspace tests, `Kmalloc`, which is backing `CString`'s memory, is just a type alias to `Cmalloc`. Reviewed-by: Alice Ryhl Reviewed-by: Benno Lossin Reviewed-by: Gary Guo Signed-off-by: Danilo Krummrich --- rust/kernel/str.rs | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) diff --git a/rust/kernel/str.rs b/rust/kernel/str.rs index 209ad1bb1a49..726329530338 100644 --- a/rust/kernel/str.rs +++ b/rust/kernel/str.rs @@ -523,7 +523,28 @@ macro_rules! c_str { #[cfg(test)] mod tests { use super::*; - use alloc::format; + + struct String(CString); + + impl String { + fn from_fmt(args: fmt::Arguments<'_>) -> Self { + String(CString::try_from_fmt(args).unwrap()) + } + } + + impl Deref for String { + type Target =3D str; + + fn deref(&self) -> &str { + self.0.to_str().unwrap() + } + } + + macro_rules! format { + ($($f:tt)*) =3D> ({ + &*String::from_fmt(kernel::fmt!($($f)*)) + }) + } =20 const ALL_ASCII_CHARS: &'static str =3D "\\x01\\x02\\x03\\x04\\x05\\x06\\x07\\x08\\x09\\x0a\\x0b\\x0c\\x0d= \\x0e\\x0f\ --=20 2.46.1