[android-common:android12-5.10-2021-10 1944/10941] kernel/cpu.c:1098:5: warning: no previous prototype for '__pause_drain_rq'

[android-common:android12-5.10-2021-10 1944/10941] kernel/cpu.c:1098:5: warning: no previous prototype for '__pause_drain_rq'

[kernel test robot]

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Hi Vincent,

FYI, the error/warning still remains.

tree:   https://android.googlesource.com/kernel/common android12-5.10-2021-10
head:   5369db4507b0f1e91f525379a20aa2b5d4ef10a0
commit: e19b8ce907a4ccc2f9dbeba218c50d1ff07fd321 [1944/10941] ANDROID: cpu/hotplug: add migration to paused_cpus
config: i386-buildonly-randconfig-r003-20211111 (https://download.01.org/0day-ci/archive/20220102/202201020111.k5AVoni8-lkp(a)intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        git remote add android-common https://android.googlesource.com/kernel/common
        git fetch --no-tags android-common android12-5.10-2021-10
        git checkout e19b8ce907a4ccc2f9dbeba218c50d1ff07fd321
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

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 '__pause_drain_rq' [-Wmissing-prototypes]
    1098 | int __pause_drain_rq(struct cpumask *cpus)
         |     ^~~~~~~~~~~~~~~~
>> kernel/cpu.c:1118:6: warning: no previous prototype for '__wait_drain_rq' [-Wmissing-prototypes]
    1118 | void __wait_drain_rq(struct cpumask *cpus)
         |      ^~~~~~~~~~~~~~~


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
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