[android-common:android14-6.1 20143/20147] kernel/sched/rt.c:1647:6: warning: no previous prototype for function 'cpu_busy_with_softirqs'

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

tree:   https://android.googlesource.com/kernel/common android14-6.1
head:   5dd0c4814fa5d61e0944fccd38547e6cb94635eb
commit: dcdec80d6bb8a786f5d5b24b4af51e0e15c534a9 [20143/20147] ANDROID: Export cpu_busy_with_softirqs()
config: arm-defconfig (https://download.01.org/0day-ci/archive/20240404/202404041114.MiHCeriw-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project.git f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240404/202404041114.MiHCeriw-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/202404041114.MiHCeriw-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from kernel/sched/build_policy.c:45:
>> kernel/sched/rt.c:1647:6: warning: no previous prototype for function 'cpu_busy_with_softirqs' [-Wmissing-prototypes]
   bool cpu_busy_with_softirqs(int cpu)
        ^
   kernel/sched/rt.c:1647:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   bool cpu_busy_with_softirqs(int cpu)
   ^
   static 
   In file included from kernel/sched/build_policy.c:49:
   kernel/sched/pelt.c:182:1: warning: no previous prototype for function '___update_load_sum' [-Wmissing-prototypes]
   ___update_load_sum(u64 now, struct sched_avg *sa,
   ^
   kernel/sched/pelt.c:181:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int
   ^
   static 
   kernel/sched/pelt.c:262:1: warning: no previous prototype for function '___update_load_avg' [-Wmissing-prototypes]
   ___update_load_avg(struct sched_avg *sa, unsigned long load)
   ^
   kernel/sched/pelt.c:261:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void
   ^
   static 
   kernel/sched/pelt.c:484:5: warning: no previous prototype for function 'sched_pelt_multiplier' [-Wmissing-prototypes]
   int sched_pelt_multiplier(struct ctl_table *table, int write, void *buffer,
       ^
   kernel/sched/pelt.c:484:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int sched_pelt_multiplier(struct ctl_table *table, int write, void *buffer,
   ^
   static 
   4 warnings generated.


vim +/cpu_busy_with_softirqs +1647 kernel/sched/rt.c

  1631	
  1632	#ifdef CONFIG_RT_SOFTIRQ_AWARE_SCHED
  1633	/*
  1634	 * Return whether the given cpu is currently non-preemptible
  1635	 * while handling a potentially long softirq, or if the current
  1636	 * task is likely to block preemptions soon because it is a
  1637	 * ksoftirq thread that is handling softirqs.
  1638	 */
  1639	bool cpu_busy_with_softirqs(int cpu)
  1640	{
  1641		u32 softirqs = per_cpu(active_softirqs, cpu) |
  1642			       __cpu_softirq_pending(cpu);
  1643	
  1644		return softirqs & LONG_SOFTIRQ_MASK;
  1645	}
  1646	#else
> 1647	bool cpu_busy_with_softirqs(int cpu)
  1648	{
  1649		return false;
  1650	}
  1651	#endif /* CONFIG_RT_SOFTIRQ_AWARE_SCHED */
  1652	EXPORT_SYMBOL_GPL(cpu_busy_with_softirqs);
  1653	

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