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Message-ID: <202601270630.FHzCSbVv-lkp@intel.com>
Date: Tue, 27 Jan 2026 06:29:48 +0800
From: kernel test robot <lkp@...el.com>
To: pengfuyuan <pengfuyuan@...inos.cn>, Danilo Krummrich <dakr@...nel.org>,
Alice Ryhl <aliceryhl@...gle.com>,
Daniel Almeida <daniel.almeida@...labora.com>,
Miguel Ojeda <ojeda@...nel.org>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
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>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Rafael J . Wysocki" <rafael@...nel.org>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
Helge Deller <deller@....de>, Hans de Goede <hansg@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>, Lee Jones <lee@...nel.org>,
Sam Ravnborg <sam@...nborg.org>, Zsolt Kajtar <soci@....rulez.org>,
Ville Syrjälä <ville.syrjala@...ux.intel.com>,
rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
pengfuyuan <pengfuyuan@...inos.cn>
Subject: Re: [PATCH v1 v1 3/4] rust: fb: add framebuffer driver support
Hi pengfuyuan,
kernel test robot noticed the following build errors:
[auto build test ERROR on rust/rust-next]
[also build test ERROR on driver-core/driver-core-linus linus/master v6.19-rc7]
[cannot apply to driver-core/driver-core-testing driver-core/driver-core-next next-20260123]
[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/pengfuyuan/rust-io-mem-add-ioremap_wc-support/20260126-162117
base: https://github.com/Rust-for-Linux/linux rust-next
patch link: https://lore.kernel.org/r/20260126081744.781392-4-pengfuyuan%40kylinos.cn
patch subject: [PATCH v1 v1 3/4] rust: fb: add framebuffer driver support
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20260127/202601270630.FHzCSbVv-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/20260127/202601270630.FHzCSbVv-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/202601270630.FHzCSbVv-lkp@intel.com/
All errors (new ones prefixed by >>):
>> error[E0308]: mismatched types
--> rust/kernel/fb/device.rs:307:23
|
307 | fb_read: Some(Self::read_callback),
| ---- ^^^^^^^^^^^^^^^^^^^ expected fn pointer, found fn item
| |
| arguments to this enum variant are incorrect
|
= note: expected fn pointer `unsafe extern "C" fn(_, *mut u8, _, _) -> _`
found fn item `extern "C" fn(_, *mut i8, _, _) -> _ {fb::device::Device::<T>::read_callback}`
help: the type constructed contains `extern "C" fn(*mut fb_info, *mut i8, usize, *mut i64) -> isize {fb::device::Device::<T>::read_callback}` due to the type of the argument passed
--> rust/kernel/fb/device.rs:307:18
|
307 | fb_read: Some(Self::read_callback),
| ^^^^^-------------------^
| |
| this argument influences the type of `Some`
note: tuple variant defined here
--> /opt/cross/rustc-1.88.0-bindgen-0.72.1/rustup/toolchains/1.88.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/option.rs:597:5
|
597 | Some(#[stable(feature = "rust1", since = "1.0.0")] T),
| ^^^^
--
>> error[E0308]: mismatched types
--> rust/kernel/fb/device.rs:308:24
|
308 | fb_write: Some(Self::write_callback),
| ---- ^^^^^^^^^^^^^^^^^^^^ expected fn pointer, found fn item
| |
| arguments to this enum variant are incorrect
|
= note: expected fn pointer `unsafe extern "C" fn(_, *const u8, _, _) -> _`
found fn item `extern "C" fn(_, *const i8, _, _) -> _ {fb::device::Device::<T>::write_callback}`
help: the type constructed contains `extern "C" fn(*mut fb_info, *const i8, usize, *mut i64) -> isize {fb::device::Device::<T>::write_callback}` due to the type of the argument passed
--> rust/kernel/fb/device.rs:308:19
|
308 | fb_write: Some(Self::write_callback),
| ^^^^^--------------------^
| |
| this argument influences the type of `Some`
note: tuple variant defined here
--> /opt/cross/rustc-1.88.0-bindgen-0.72.1/rustup/toolchains/1.88.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/option.rs:597:5
|
597 | Some(#[stable(feature = "rust1", since = "1.0.0")] T),
| ^^^^
--
>> error[E0308]: mismatched types
--> rust/kernel/fb/io.rs:32:13
|
30 | bindings::fb_io_read(
| -------------------- arguments to this function are incorrect
31 | device.as_raw(),
32 | buf.as_mut_ptr() as *mut core::ffi::c_char,
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `*mut u8`, found `*mut i8`
|
= note: expected raw pointer `*mut u8`
found raw pointer `*mut i8`
note: function defined here
--> rust/bindings/bindings_generated.rs:123562:12
|
123562 | pub fn fb_io_read(
| ^^^^^^^^^^
--
>> error[E0308]: mismatched types
--> rust/kernel/fb/io.rs:58:13
|
56 | bindings::fb_io_write(
| --------------------- arguments to this function are incorrect
57 | device.as_raw(),
58 | buf.as_ptr() as *const core::ffi::c_char,
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `*const u8`, found `*const i8`
|
= note: expected raw pointer `*const u8`
found raw pointer `*const i8`
note: function defined here
--> rust/bindings/bindings_generated.rs:123570:12
|
123570 | pub fn fb_io_write(
| ^^^^^^^^^^^
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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