[openeuler:OLK-5.10 3112/3112] drivers/cpufreq/intel_pstate.c:1473:6: warning: no previous prototype for function 'notify_hwp_interrupt'

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

tree:   https://gitee.com/openeuler/kernel.git OLK-5.10
head:   8a6052b70d77d3f0bda83a13959905e235baa1e5
commit: e217d5958ee378eb304fb0b4eb6fcb551e555842 [3112/3112] cpufreq: intel_pstate: Process HWP Guaranteed change notification
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20250813/202508132203.QmNm6D3S-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 7d886fab74d4037d654d02bed24dd97c0ba863d6)
rustc: rustc 1.58.0 (02072b482 2022-01-11)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250813/202508132203.QmNm6D3S-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/202508132203.QmNm6D3S-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/cpufreq/intel_pstate.c:1473:6: warning: no previous prototype for function 'notify_hwp_interrupt' [-Wmissing-prototypes]
    1473 | void notify_hwp_interrupt(void)
         |      ^
   drivers/cpufreq/intel_pstate.c:1473:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
    1473 | void notify_hwp_interrupt(void)
         | ^
         | static 
   drivers/cpufreq/intel_pstate.c:80:23: warning: unused function 'percent_fp' [-Wunused-function]
      80 | static inline int32_t percent_fp(int percent)
         |                       ^~~~~~~~~~
   drivers/cpufreq/intel_pstate.c:95:23: warning: unused function 'percent_ext_fp' [-Wunused-function]
      95 | static inline int32_t percent_ext_fp(int percent)
         |                       ^~~~~~~~~~~~~~
   3 warnings generated.


vim +/notify_hwp_interrupt +1473 drivers/cpufreq/intel_pstate.c

  1472	
> 1473	void notify_hwp_interrupt(void)
  1474	{
  1475		unsigned int this_cpu = smp_processor_id();
  1476		struct cpudata *cpudata;
  1477		unsigned long flags;
  1478		u64 value;
  1479	
  1480		if (!READ_ONCE(hwp_active) || !boot_cpu_has(X86_FEATURE_HWP_NOTIFY))
  1481			return;
  1482	
  1483		rdmsrl_safe(MSR_HWP_STATUS, &value);
  1484		if (!(value & 0x01))
  1485			return;
  1486	
  1487		spin_lock_irqsave(&hwp_notify_lock, flags);
  1488	
  1489		if (!cpumask_test_cpu(this_cpu, &hwp_intr_enable_mask))
  1490			goto ack_intr;
  1491	
  1492		/*
  1493		 * Currently we never free all_cpu_data. And we can't reach here
  1494		 * without this allocated. But for safety for future changes, added
  1495		 * check.
  1496		 */
  1497		if (unlikely(!READ_ONCE(all_cpu_data)))
  1498			goto ack_intr;
  1499	
  1500		/*
  1501		 * The free is done during cleanup, when cpufreq registry is failed.
  1502		 * We wouldn't be here if it fails on init or switch status. But for
  1503		 * future changes, added check.
  1504		 */
  1505		cpudata = READ_ONCE(all_cpu_data[this_cpu]);
  1506		if (unlikely(!cpudata))
  1507			goto ack_intr;
  1508	
  1509		schedule_delayed_work(&cpudata->hwp_notify_work, msecs_to_jiffies(10));
  1510	
  1511		spin_unlock_irqrestore(&hwp_notify_lock, flags);
  1512	
  1513		return;
  1514	
  1515	ack_intr:
  1516		wrmsrl_safe(MSR_HWP_STATUS, 0);
  1517		spin_unlock_irqrestore(&hwp_notify_lock, flags);
  1518	}
  1519	

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