linux-kernel - Re: [PATCH 12/12] rust: pin-init: internal: init: add escape hatch for referencing initialized fields

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Message-ID: <202601091003.kjIJiuUn-lkp@intel.com>
Date: Fri, 9 Jan 2026 10:44:00 +0100
From: kernel test robot <lkp@...el.com>
To: Benno Lossin <lossin@...nel.org>, Gary Guo <gary@...yguo.net>,
	Miguel Ojeda <ojeda@...nel.org>, Boqun Feng <boqun.feng@...il.com>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>
Cc: oe-kbuild-all@...ts.linux.dev, Janne Grunau <j@...nau.net>,
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 12/12] rust: pin-init: internal: init: add escape hatch
 for referencing initialized fields

Hi Benno,

kernel test robot noticed the following build warnings:

[auto build test WARNING on rust/rust-next]
[also build test WARNING on linus/master v6.19-rc4 next-20260109]
[cannot apply to rust/pin-init-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Benno-Lossin/rust-pin-init-allow-the-crate-to-refer-to-itself-as-pin-init-in-doc-tests/20260108-234753
base:   https://github.com/Rust-for-Linux/linux rust-next
patch link:    https://lore.kernel.org/r/20260108135127.3153925-13-lossin%40kernel.org
patch subject: [PATCH 12/12] rust: pin-init: internal: init: add escape hatch for referencing initialized fields
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20260109/202601091003.kjIJiuUn-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
rustc: rustc 1.88.0 (6b00bc388 2025-06-23)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260109/202601091003.kjIJiuUn-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601091003.kjIJiuUn-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> warning: large size difference between variants
   --> rust/pin-init/internal/src/init.rs:59:1
   |
   59 | / enum InitializerAttribute {
   60 | |     DefaultError(DefaultErrorAttribute),
   | |     ----------------------------------- the largest variant contains at least 224 bytes
   61 | |     DisableInitializedFieldAccess,
   | |     ----------------------------- the second-largest variant carries no data at all
   62 | | }
   | |_^ the entire enum is at least 224 bytes
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#large_enum_variant
   = note: `-W clippy::large-enum-variant` implied by `-W clippy::all`
   = help: to override `-W clippy::all` add `#[allow(clippy::large_enum_variant)]`
   help: consider boxing the large fields to reduce the total size of the enum
   |
   60 -     DefaultError(DefaultErrorAttribute),
   60 +     DefaultError(Box<DefaultErrorAttribute>),
   |

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki