[openeuler:OLK-5.10 2985/2985] kernel/watchdog_hld.c:502:12: warning: no previous prototype for function '__hardlockup_detector_perf_init'

[openeuler:OLK-5.10 2985/2985] kernel/watchdog_hld.c:502:12: warning: no previous prototype for function '__hardlockup_detector_perf_init'

[kernel test robot]

tree:   https://gitee.com/openeuler/kernel.git OLK-5.10
head:   c245365237da527fb423d85e7ec54648113f843d
commit: 364de98eacea8dbfe4f926f62085aebf8534f403 [2985/2985] watchdog: Fix sleeping function called from atomic context
config: x86_64-buildonly-randconfig-2004-20250626 (https://download.01.org/0day-ci/archive/20250629/202506290345.5mLGiKER-lkp@intel.com/config)
compiler: clang version 20.1.7 (https://github.com/llvm/llvm-project 6146a88f60492b520a36f8f8f3231e15f3cc6082)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250629/202506290345.5mLGiKER-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/202506290345.5mLGiKER-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/watchdog_hld.c:502:12: warning: no previous prototype for function '__hardlockup_detector_perf_init' [-Wmissing-prototypes]
     502 | int __init __hardlockup_detector_perf_init(void *not_used)
         |            ^
   kernel/watchdog_hld.c:502:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     502 | int __init __hardlockup_detector_perf_init(void *not_used)
         | ^
         | static 
   1 warning generated.


vim +/__hardlockup_detector_perf_init +502 kernel/watchdog_hld.c

   501	
 > 502	int __init __hardlockup_detector_perf_init(void *not_used)
   503	{
   504		int ret = hardlockup_detector_event_create();
   505	
   506		if (ret) {
   507			pr_info("Perf NMI watchdog permanently disabled\n");
   508		} else {
   509			perf_event_release_kernel(this_cpu_read(watchdog_ev));
   510			this_cpu_write(watchdog_ev, NULL);
   511		}
   512		return ret;
   513	}
   514	

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