Re: [RFC][PATCH 1/2] sched: Avoid placing RT threads on cores handling long softirqs

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

Hi John,

[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on tip/sched/core]
[also build test WARNING on linus/master v5.19 next-20220811]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/John-Stultz/Softirq-rt-Optimizations/20220811-100030
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 8648f92a66a323ed01903d2cbb248cdbe2f312d9
config: arm64-randconfig-r002-20220810 (https://download.01.org/0day-ci/archive/20220812/202208120033.qCqng8xp-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 5f1c7e2cc5a3c07cbc2412e851a7283c1841f520)
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
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/3fceb870d95188903796394cbe5fd2493ee872c6
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review John-Stultz/Softirq-rt-Optimizations/20220811-100030
        git checkout 3fceb870d95188903796394cbe5fd2493ee872c6
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash kernel/

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

All warnings (new ones prefixed by >>):

   In file included from kernel/sched/build_policy.c:45:
>> kernel/sched/rt.c:1634:6: warning: no previous prototype for function 'rt_task_fits_capacity_and_may_preempt' [-Wmissing-prototypes]
   bool rt_task_fits_capacity_and_may_preempt(struct task_struct *p, int cpu)
        ^
   kernel/sched/rt.c:1634:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   bool rt_task_fits_capacity_and_may_preempt(struct task_struct *p, int cpu)
   ^
   static 
   1 warning generated.


vim +/rt_task_fits_capacity_and_may_preempt +1634 kernel/sched/rt.c

  1633	
> 1634	bool rt_task_fits_capacity_and_may_preempt(struct task_struct *p, int cpu)
  1635	{
  1636		return task_may_preempt(p, cpu) && rt_task_fits_capacity(p, cpu);
  1637	}
  1638	

-- 
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https://01.org/lkp