From nobody Fri Apr 3 01:22:51 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 7776F285041; Sun, 15 Feb 2026 20:23:27 +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=1771187007; cv=none; b=PyT35mV+oxr/h0ORbFW40OZfWECx4ob7Ce6ORHUmyQa7o4UC59zWtktXrCMtUH6G9QFnp7kqk7T3ZZEReHguHJvJdcgZB9zLX058P17G/KODgHRVM9ZrBW8Y5yqe0b5G8CSayEfWaoodlwRKO0rl8K+bfQuza+KrdmVzV73RhhQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771187007; c=relaxed/simple; bh=IAegEq6wvSTCSwwppXsh49sbejfMYcE9NVPrJzZfXzE=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=CpA+u7chH07iuls0kCKbF8ov6zON7+lU4yRdLSEf5/yvVENZF3YiGWg6HO2OqMUj6JT9x4dpIVvpG7yHk+odl6MwXf8aba3uPOHCz8/oN0Ul3FeyrsJ6Z5k17YcNI4jzvlxDkbmKukMpIExbWoEFxPHQakmmnp4wvmgwSQZry0Y= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JBGiEjvO; 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="JBGiEjvO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BF55FC4CEF7; Sun, 15 Feb 2026 20:23:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771187007; bh=IAegEq6wvSTCSwwppXsh49sbejfMYcE9NVPrJzZfXzE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=JBGiEjvO+fffztXBWoSDnzUGonTFKPwH6aj9neKV9dxerWbiS9QeSxj+K5x/juGJt vu/dD5ivWUCyyzhPmSQ9wJkM1P99PxCuI2WH4zsLOCJWvcO3Z1GaJmZEInLr3/+CC9 g/NrayrkC5VUEQLhZgRA7aHGeQyA52ZcPRylBKV6C9ukPpGwnmZMiWj34jKlY2kx4N hkbI+ny9/IvVZ1KIf3v7XVPn0FHGauoaZZ1QmyG2aoTGrjHOuqn/3/vb/Oju6fcKsY UjG+CpWyfteyJZ+co//3CTAu9QKCgoao3r82gtt6L1y8TjRwnOgRq/5iqJUZYdHLsy bMbxSdQZCNvsw== From: Andreas Hindborg Date: Sun, 15 Feb 2026 21:22:57 +0100 Subject: [PATCH 1/2] rust: impl_flags: add conversion functions 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: <20260215-impl-flags-additions-v1-1-6538c8fb841c@kernel.org> References: <20260215-impl-flags-additions-v1-0-6538c8fb841c@kernel.org> In-Reply-To: <20260215-impl-flags-additions-v1-0-6538c8fb841c@kernel.org> To: Miguel Ojeda , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Alice Ryhl , Trevor Gross , Danilo Krummrich Cc: 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=1647; i=a.hindborg@kernel.org; h=from:subject:message-id; bh=IAegEq6wvSTCSwwppXsh49sbejfMYcE9NVPrJzZfXzE=; b=owEBbQKS/ZANAwAKAeG4Gj55KGN3AcsmYgBpkisxOJnInn1MyxUq7hWHWQlqrpwdquQpHBucA fQi0eG6CGmJAjMEAAEKAB0WIQQSwflHVr98KhXWwBLhuBo+eShjdwUCaZIrMQAKCRDhuBo+eShj d/DGEACq4/wtWuhPd+GImXZdPujgaJLtPTK2J0qjos8ZVR3cj1UN7vE/CmZrKPCF8xO5ME+fTXn HWWm8WK/91OHnYoZ24cjDdCbYhi2pTP5HZzNcHMHcyKYirxoEhvKyTz5+Nt21P9Lw0dqGRMfc5t 7dV05EZ5BkC0za47vSr+9qiSrj8eG24G+VWluqcgd9rZYj7ElQ5dMNoHTYQ9l7Z+7h/zuxAC+JR EFmNSfiE9kScpafQ2xtFnsry/v2hTbauUjyZYuh6Ly++QvxLOGCUXwmm1+/YiKpyaTn+SzUZAlZ t1g1nhCsncLqerXsGnkmDQEWEjxeWnwsX965YlqNTk+E4b1EM5yZxKmEFY/4GaVIAUe9u6/0gxX v7vnwM7VLudi2aMW3EgruBBIHAccacNLJwOUU4ReMg4C3DOC47+C9PLsAtJbs5rNPwm9IsiP2bn b3LzbqH92xf+rWaucyuS0szY99uXv0oBFJPVZnhvRjJS2qtfLRMI9VSrXssrVrN1vAjPfeWU2uQ fJDQm7awBwtN0grcHWUx4MmzJDCXDvaQg5LP0I8zVWPIGDM2KnN/BJBFxetlwDHAU2TVR/S35oQ IlXeP2F7M+XqLpc8xewYaEIw5qzrrC8bvdGvhxh3t5CS0b2ap3PBSvtbsh0V7K6Gre8ajjiC9Kr K28mvIlkghRzfPA== X-Developer-Key: i=a.hindborg@kernel.org; a=openpgp; fpr=3108C10F46872E248D1FB221376EB100563EF7A7 Add two conversion functions to the `impl_flags!` macro: - A `From<_>` implementation to convert from the flag value enum to underlying type. - A `TryFrom<_> implementation to convert from the underlying representation to flag container type. Signed-off-by: Andreas Hindborg --- rust/kernel/impl_flags.rs | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/rust/kernel/impl_flags.rs b/rust/kernel/impl_flags.rs index 9160e8ce2e126..f34ecbe870d80 100644 --- a/rust/kernel/impl_flags.rs +++ b/rust/kernel/impl_flags.rs @@ -102,6 +102,26 @@ fn from(value: $flags) -> Self { } } =20 + impl ::core::convert::From<$flag> for $ty { + #[inline] + fn from(value: $flag) -> Self { + // SAFETY: All `$flag` values are valid for use as `$ty`. + unsafe { core::mem::transmute::<$flag, $ty>(value) } + } + } + + impl ::core::convert::TryFrom<$ty> for $flags { + type Error =3D ::kernel::error::Error; + + fn try_from(value: $ty) -> Result { + match value & !$flags::all_bits() =3D=3D 0 { + // SAFETY: We checked above that `value` is a valid bi= t pattern for `$flags`. + true =3D> Ok(unsafe {::core::mem::transmute::<$ty, $fl= ags>(value)}), + false =3D> Err(::kernel::error::code::EINVAL), + } + } + } + impl ::core::ops::BitOr for $flags { type Output =3D Self; #[inline] --=20 2.51.2