linux-kernel - Re: [PATCH] rust/dma: Take &mut self in CoherentAllocation::field

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Message-ID: <202510310102.NdHj0ur8-lkp@intel.com>
Date: Fri, 31 Oct 2025 02:06:32 +0800
From: kernel test robot <lkp@...el.com>
To: Lyude Paul <lyude@...hat.com>, dri-devel@...ts.freedesktop.org,
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	Danilo Krummrich <dakr@...nel.org>,
	Abdiel Janulgue <abdiel.janulgue@...il.com>,
	Daniel Almeida <daniel.almeida@...labora.com>,
	Robin Murphy <robin.murphy@....com>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>
Subject: Re: [PATCH] rust/dma: Take &mut self in
 CoherentAllocation::field_write()

Hi Lyude,

kernel test robot noticed the following build errors:

[auto build test ERROR on 3b83f5d5e78ac5cddd811a5e431af73959864390]

url:    https://github.com/intel-lab-lkp/linux/commits/Lyude-Paul/rust-dma-Take-mut-self-in-CoherentAllocation-field_write/20251029-052034
base:   3b83f5d5e78ac5cddd811a5e431af73959864390
patch link:    https://lore.kernel.org/r/20251028211801.85215-1-lyude%40redhat.com
patch subject: [PATCH] rust/dma: Take &mut self in CoherentAllocation::field_write()
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20251031/202510310102.NdHj0ur8-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/20251031/202510310102.NdHj0ur8-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/202510310102.NdHj0ur8-lkp@intel.com/

All errors (new ones prefixed by >>):

>> error[E0596]: cannot borrow value as mutable, as it is not declared as mutable
   --> samples/rust/rust_dma.rs:70:13
   |
   70 |             kernel::dma_write!(ca[i] = MyStruct::new(value.0, value.1))?;
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot borrow as mutable
   |
   = note: this error originates in the macro `$crate::dma_write` which comes from the expansion of the macro `kernel::dma_write` (in Nightly builds, run with -Z macro-backtrace for more info)
   help: consider changing this to be mutable
   |
   66 |         let mut ca: CoherentAllocation<MyStruct> =
   |             +++

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