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/[email protected]/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/[email protected]/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 <[email protected]> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ 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
