Re: [PATCH v5] rust: introduce sfile macro for succinct code tracing

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

Hi Timur,

kernel test robot noticed the following build errors:

[auto build test ERROR on c4dce0c094a89b1bc8fde1163342bd6fe29c0370]

url:    https://github.com/intel-lab-lkp/linux/commits/Timur-Tabi/rust-introduce-sfile-macro-for-succinct-code-tracing/20250627-043731
base:   c4dce0c094a89b1bc8fde1163342bd6fe29c0370
patch link:    https://lore.kernel.org/r/20250626203535.331219-1-ttabi%40nvidia.com
patch subject: [PATCH v5] rust: introduce sfile macro for succinct code tracing
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20250629/202506292116.f6SHoUIX-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
rustc: rustc 1.78.0 (9b00956e5 2024-04-29)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250629/202506292116.f6SHoUIX-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/202506292116.f6SHoUIX-lkp@intel.com/

All errors (new ones prefixed by >>):

>> error: `Option::<T>::unwrap` is not yet stable as a const fn
   --> rust/doctests_kernel_generated.rs:5969:29
   |
   5969 | const SFILE: &'static str = sfile!();
   |                             ^^^^^^^^
   |
   = help: add `#![feature(const_option)]` to the crate attributes to enable
   = note: this error originates in the macro `sfile` (in Nightly builds, run with -Z macro-backtrace for more info)
--
>> error: `Option::<T>::unwrap` is not yet stable as a const fn
   --> rust/doctests_kernel_generated.rs:5915:20
   |
   5915 | pr_err!("{}:{}n", sfile!(), line!());
   |                    ^^^^^^^^
   |
   = help: add `#![feature(const_option)]` to the crate attributes to enable
   = note: this error originates in the macro `sfile` (in Nightly builds, run with -Z macro-backtrace for more info)

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