Re: [PATCH v2 2/2] cpufreq: Pass the policy to cpufreq_driver->adjust_perf()

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

Hi Prateek,

kernel test robot noticed the following build errors:

[auto build test ERROR on 1f630297e183aa2abbafdbe8c4f916ee647e6e21]

url:    https://github.com/intel-lab-lkp/linux/commits/K-Prateek-Nayak/cpufreq-amd-pstate-Pass-the-policy-to-amd_pstate_update/20260114-165940
base:   1f630297e183aa2abbafdbe8c4f916ee647e6e21
patch link:    https://lore.kernel.org/r/20260114085113.21378-3-kprateek.nayak%40amd.com
patch subject: [PATCH v2 2/2] cpufreq: Pass the policy to cpufreq_driver->adjust_perf()
config: arm64-randconfig-001-20260114 (https://download.01.org/0day-ci/archive/20260115/202601150006.r4sCNEZq-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 9b8addffa70cee5b2acc5454712d9cf78ce45710)
rustc: rustc 1.88.0 (6b00bc388 2025-06-23)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260115/202601150006.r4sCNEZq-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/202601150006.r4sCNEZq-lkp@intel.com/

All errors (new ones prefixed by >>):

>> error[E0308]: mismatched types
   --> rust/kernel/cpufreq.rs:946:18
   |
   946 |             Some(Self::adjust_perf_callback)
   |             ---- ^^^^^^^^^^^^^^^^^^^^^^^^^^ expected fn pointer, found fn item
   |             |
   |             arguments to this enum variant are incorrect
   |
   = note: expected fn pointer `unsafe extern "C" fn(*mut bindings::cpufreq_policy, _, _, _)`
   found fn item `unsafe extern "C" fn(u32, _, _, _) {cpufreq::Registration::<T>::adjust_perf_callback}`
   help: the type constructed contains `unsafe extern "C" fn(u32, usize, usize, usize) {cpufreq::Registration::<T>::adjust_perf_callback}` due to the type of the argument passed
   --> rust/kernel/cpufreq.rs:946:13
   |
   946 |             Some(Self::adjust_perf_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),
   |     ^^^^

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