[android-common:android12-5.10-2021-09 1944/10848] kernel/cpu.c:1098:5: warning: no previous prototype for function '__pause_drain_rq'

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

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tree:   https://android.googlesource.com/kernel/common android12-5.10-2021-09
head:   ece338aaa6b4bdf1c505c64f6b391e5cfabbfee5
commit: e19b8ce907a4ccc2f9dbeba218c50d1ff07fd321 [1944/10848] ANDROID: cpu/hotplug: add migration to paused_cpus
config: x86_64-randconfig-r033-20210928 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project dc6e8dfdfe7efecfda318d43a06fae18b40eb498)
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 android-common https://android.googlesource.com/kernel/common
        git fetch --no-tags android-common android12-5.10-2021-09
        git checkout e19b8ce907a4ccc2f9dbeba218c50d1ff07fd321
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 

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 >>):

>> kernel/cpu.c:1098:5: warning: no previous prototype for function '__pause_drain_rq' [-Wmissing-prototypes]
   int __pause_drain_rq(struct cpumask *cpus)
       ^
   kernel/cpu.c:1098:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int __pause_drain_rq(struct cpumask *cpus)
   ^
   static 
>> kernel/cpu.c:1118:6: warning: no previous prototype for function '__wait_drain_rq' [-Wmissing-prototypes]
   void __wait_drain_rq(struct cpumask *cpus)
        ^
   kernel/cpu.c:1118:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __wait_drain_rq(struct cpumask *cpus)
   ^
   static 
   2 warnings generated.


vim +/__pause_drain_rq +1098 kernel/cpu.c

  1097	
> 1098	int __pause_drain_rq(struct cpumask *cpus)
  1099	{
  1100		unsigned int cpu;
  1101		int err = 0;
  1102	
  1103		/*
  1104		 * Disabling preemption avoids that one of the stopper, started from
  1105		 * sched_cpu_drain_rq(), blocks firing draining for the whole cpumask.
  1106		 */
  1107		preempt_disable();
  1108		for_each_cpu(cpu, cpus) {
  1109			err = sched_cpu_drain_rq(cpu);
  1110			if (err)
  1111				break;
  1112		}
  1113		preempt_enable();
  1114	
  1115		return err;
  1116	}
  1117	
> 1118	void __wait_drain_rq(struct cpumask *cpus)
  1119	{
  1120		unsigned int cpu;
  1121	
  1122		for_each_cpu(cpu, cpus)
  1123			sched_cpu_drain_rq_wait(cpu);
  1124	}
  1125	

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

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