linux-kernel - Re: [PATCH v2 2/5] rust: num: add `shr` and `shl` methods to `Bounded`

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Message-ID: <202601220119.LQY1LLC8-lkp@intel.com>
Date: Thu, 22 Jan 2026 01:49:54 +0800
From: kernel test robot <lkp@...el.com>
To: Alexandre Courbot <acourbot@...dia.com>,
	Danilo Krummrich <dakr@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Daniel Almeida <daniel.almeida@...labora.com>,
	Miguel Ojeda <ojeda@...nel.org>, Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Trevor Gross <tmgross@...ch.edu>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	Yury Norov <yury.norov@...il.com>,
	John Hubbard <jhubbard@...dia.com>,
	Alistair Popple <apopple@...dia.com>,
	Joel Fernandes <joelagnelf@...dia.com>,
	Timur Tabi <ttabi@...dia.com>, Edwin Peer <epeer@...dia.com>,
	Eliot Courtney <ecourtney@...dia.com>,
	Dirk Behme <dirk.behme@...bosch.com>,
	Steven Price <steven.price@....com>, rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Alexandre Courbot <acourbot@...dia.com>
Subject: Re: [PATCH v2 2/5] rust: num: add `shr` and `shl` methods to
 `Bounded`

Hi Alexandre,

kernel test robot noticed the following build warnings:

[auto build test WARNING on c259cd7ea3c9ad369c473ba2385d82e3432088b1]

url:    https://github.com/intel-lab-lkp/linux/commits/Alexandre-Courbot/rust-enable-the-generic_arg_infer-feature/20260121-152936
base:   c259cd7ea3c9ad369c473ba2385d82e3432088b1
patch link:    https://lore.kernel.org/r/20260121-register-v2-2-79d9b8d5e36a%40nvidia.com
patch subject: [PATCH v2 2/5] rust: num: add `shr` and `shl` methods to `Bounded`
config: x86_64-randconfig-071-20260121 (https://download.01.org/0day-ci/archive/20260122/202601220119.LQY1LLC8-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/20260122/202601220119.LQY1LLC8-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/202601220119.LQY1LLC8-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> warning: unnecessary `unsafe` block
   --> rust/kernel/num/bounded.rs:491:9
   |
   491 |         unsafe { Bounded::__new(self.0 >> SHIFT) }
   |         ^^^^^^ unnecessary `unsafe` block
   |
   = note: `#[warn(unused_unsafe)]` on by default
--
>> warning: unnecessary `unsafe` block
   --> rust/kernel/num/bounded.rs:511:9
   |
   511 |         unsafe { Bounded::__new(self.0 << SHIFT) }
   |         ^^^^^^ unnecessary `unsafe` block

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