[chrome-os:chromeos-5.10 9996/9999] drivers/cpufreq/intel_pstate.c:1484:6: warning: no previous prototype for function 'notify_hwp_interrupt'

[chrome-os:chromeos-5.10 9996/9999] drivers/cpufreq/intel_pstate.c:1484:6: warning: no previous prototype for function 'notify_hwp_interrupt'

[kernel test robot]

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tree:   https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-5.10
head:   2e5244bd3ec10b256c6f03bf2a33dd5a277df6f4
commit: 121d08a011e0315614d6f9018585815c5fab305c [9996/9999] UPSTREAM: cpufreq: intel_pstate: Process HWP Guaranteed change notification
config: x86_64-randconfig-a013-20211228 (https://download.01.org/0day-ci/archive/20211228/202112282102.XSjvgHch-lkp(a)intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 7171af744543433ac75b232eb7dfdaef7efd4d7a)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git remote add chrome-os https://chromium.googlesource.com/chromiumos/third_party/kernel
        git fetch --no-tags chrome-os chromeos-5.10
        git checkout 121d08a011e0315614d6f9018585815c5fab305c
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/cpufreq/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/cpufreq/intel_pstate.c:1484:6: warning: no previous prototype for function 'notify_hwp_interrupt' [-Wmissing-prototypes]
   void notify_hwp_interrupt(void)
        ^
   drivers/cpufreq/intel_pstate.c:1484:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void notify_hwp_interrupt(void)
   ^
   static 
   drivers/cpufreq/intel_pstate.c:80:23: warning: unused function 'percent_fp' [-Wunused-function]
   static inline int32_t percent_fp(int percent)
                         ^
   drivers/cpufreq/intel_pstate.c:95:23: warning: unused function 'percent_ext_fp' [-Wunused-function]
   static inline int32_t percent_ext_fp(int percent)
                         ^
   3 warnings generated.


vim +/notify_hwp_interrupt +1484 drivers/cpufreq/intel_pstate.c

  1483	
> 1484	void notify_hwp_interrupt(void)
  1485	{
  1486		unsigned int this_cpu = smp_processor_id();
  1487		struct cpudata *cpudata;
  1488		unsigned long flags;
  1489		u64 value;
  1490	
  1491		if (!READ_ONCE(hwp_active) || !boot_cpu_has(X86_FEATURE_HWP_NOTIFY))
  1492			return;
  1493	
  1494		rdmsrl_safe(MSR_HWP_STATUS, &value);
  1495		if (!(value & 0x01))
  1496			return;
  1497	
  1498		spin_lock_irqsave(&hwp_notify_lock, flags);
  1499	
  1500		if (!cpumask_test_cpu(this_cpu, &hwp_intr_enable_mask))
  1501			goto ack_intr;
  1502	
  1503		/*
  1504		 * Currently we never free all_cpu_data. And we can't reach here
  1505		 * without this allocated. But for safety for future changes, added
  1506		 * check.
  1507		 */
  1508		if (unlikely(!READ_ONCE(all_cpu_data)))
  1509			goto ack_intr;
  1510	
  1511		/*
  1512		 * The free is done during cleanup, when cpufreq registry is failed.
  1513		 * We wouldn't be here if it fails on init or switch status. But for
  1514		 * future changes, added check.
  1515		 */
  1516		cpudata = READ_ONCE(all_cpu_data[this_cpu]);
  1517		if (unlikely(!cpudata))
  1518			goto ack_intr;
  1519	
  1520		schedule_delayed_work(&cpudata->hwp_notify_work, msecs_to_jiffies(10));
  1521	
  1522		spin_unlock_irqrestore(&hwp_notify_lock, flags);
  1523	
  1524		return;
  1525	
  1526	ack_intr:
  1527		wrmsrl_safe(MSR_HWP_STATUS, 0);
  1528		spin_unlock_irqrestore(&hwp_notify_lock, flags);
  1529	}
  1530	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org