Re: [PATCH v3] gpu: nova-core: gsp: fix undefined behavior in command queue code

[kernel test robot <lkp@intel.com>]

Hi Alexandre,

kernel test robot noticed the following build errors:

[auto build test ERROR on dff8302ca1d0e773c90dbeeb05e759f995c95482]

url:    https://github.com/intel-lab-lkp/linux/commits/Alexandre-Courbot/gpu-nova-core-gsp-fix-undefined-behavior-in-command-queue-code/20260327-003216
base:   dff8302ca1d0e773c90dbeeb05e759f995c95482
patch link:    https://lore.kernel.org/r/20260326-cmdq-ub-fix-v3-1-96af2148ca5c%40nvidia.com
patch subject: [PATCH v3] gpu: nova-core: gsp: fix undefined behavior in command queue code
config: um-randconfig-002-20260327 (https://download.01.org/0day-ci/archive/20260328/202603280326.ucDKVaf2-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 054e11d1a17e5ba88bb1a8ef32fad3346e80b186)
rustc: rustc 1.88.0 (6b00bc388 2025-06-23)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260328/202603280326.ucDKVaf2-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603280326.ucDKVaf2-lkp@intel.com/

All errors (new ones prefixed by >>):

   /usr/bin/ld: warning: .tmp_vmlinux1 has a LOAD segment with RWX permissions
   /usr/bin/ld: drivers/gpu/nova-core/nova_core.o: in function `<core::ops::range::Range<usize> as kernel::ptr::projection::ProjectIndex<[[u8; 4096]]>>::index::{closure#0}':
>> rust/kernel/build_assert.rs:28:(.text+0xfb16): undefined reference to `rust_build_error'
   clang: error: linker command failed with exit code 1 (use -v to see invocation)


vim +28 rust/kernel/build_assert.rs

614724e780f587 Miguel Ojeda 2024-11-23   7  
0f595bab9d1c1a Gary Guo     2022-11-10   8  /// Fails the build if the code path calling `build_error!` can possibly be executed.
0f595bab9d1c1a Gary Guo     2022-11-10   9  ///
0f595bab9d1c1a Gary Guo     2022-11-10  10  /// If the macro is executed in const context, `build_error!` will panic.
0f595bab9d1c1a Gary Guo     2022-11-10  11  /// If the compiler or optimizer cannot guarantee that `build_error!` can never
0f595bab9d1c1a Gary Guo     2022-11-10  12  /// be called, a build error will be triggered.
0f595bab9d1c1a Gary Guo     2022-11-10  13  ///
0f595bab9d1c1a Gary Guo     2022-11-10  14  /// # Examples
0f595bab9d1c1a Gary Guo     2022-11-10  15  ///
0f595bab9d1c1a Gary Guo     2022-11-10  16  /// ```
0f595bab9d1c1a Gary Guo     2022-11-10  17  /// #[inline]
0f595bab9d1c1a Gary Guo     2022-11-10  18  /// fn foo(a: usize) -> usize {
0f595bab9d1c1a Gary Guo     2022-11-10  19  ///     a.checked_add(1).unwrap_or_else(|| build_error!("overflow"))
0f595bab9d1c1a Gary Guo     2022-11-10  20  /// }
0f595bab9d1c1a Gary Guo     2022-11-10  21  ///
0f595bab9d1c1a Gary Guo     2022-11-10  22  /// assert_eq!(foo(usize::MAX - 1), usize::MAX); // OK.
0f595bab9d1c1a Gary Guo     2022-11-10  23  /// // foo(usize::MAX); // Fails to compile.
0f595bab9d1c1a Gary Guo     2022-11-10  24  /// ```
0f595bab9d1c1a Gary Guo     2022-11-10  25  #[macro_export]
0f595bab9d1c1a Gary Guo     2022-11-10  26  macro_rules! build_error {
0f595bab9d1c1a Gary Guo     2022-11-10  27      () => {{
614724e780f587 Miguel Ojeda 2024-11-23 @28          $crate::build_assert::build_error("")
0f595bab9d1c1a Gary Guo     2022-11-10  29      }};
0f595bab9d1c1a Gary Guo     2022-11-10  30      ($msg:expr) => {{
614724e780f587 Miguel Ojeda 2024-11-23  31          $crate::build_assert::build_error($msg)
0f595bab9d1c1a Gary Guo     2022-11-10  32      }};
0f595bab9d1c1a Gary Guo     2022-11-10  33  }
0f595bab9d1c1a Gary Guo     2022-11-10  34  

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