linux-kernel - Re: [PATCH] sched/rt: Support multi-criterion fitness search for

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Date:   Sun, 15 May 2022 08:53:01 +0800
From:   kernel test robot <lkp@...el.com>
To:     Qais Yousef <qais.yousef@....com>,
        Xuewen Yan <xuewen.yan94@...il.com>
Cc:     kbuild-all@...ts.01.org, Lukasz Luba <lukasz.luba@....com>,
        dietmar.eggemann@....com, rafael@...nel.org,
        viresh.kumar@...aro.org, mingo@...hat.com,
        vincent.guittot@...aro.org, rostedt@...dmis.org,
        linux-kernel@...r.kernel.org, di.shen@...soc.com,
        王科 (Ke Wang) <Ke.Wang@...soc.com>
Subject: Re: [PATCH] sched/rt: Support multi-criterion fitness search for

Hi Qais,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on tip/sched/core]
[also build test WARNING on v5.18-rc6 next-20220513]
[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]

url:    https://github.com/intel-lab-lkp/linux/commits/Qais-Yousef/sched-rt-Support-multi-criterion-fitness-search-for/20220515-075732
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 734387ec2f9d77b00276042b1fa7c95f48ee879d
config: arc-defconfig (https://download.01.org/0day-ci/archive/20220515/202205150843.y0w5RC5K-lkp@intel.com/config)
compiler: arc-elf-gcc (GCC) 11.3.0
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
        # https://github.com/intel-lab-lkp/linux/commit/0eee64011b1d43795b5c8d1aa62927ba3f07a225
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Qais-Yousef/sched-rt-Support-multi-criterion-fitness-search-for/20220515-075732
        git checkout 0eee64011b1d43795b5c8d1aa62927ba3f07a225
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=arc SHELL=/bin/bash kernel/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   In file included from kernel/sched/build_policy.c:45:
   kernel/sched/rt.c:259:6: warning: no previous prototype for 'unregister_rt_sched_group' [-Wmissing-prototypes]
     259 | void unregister_rt_sched_group(struct task_group *tg) { }
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/sched/rt.c:261:6: warning: no previous prototype for 'free_rt_sched_group' [-Wmissing-prototypes]
     261 | void free_rt_sched_group(struct task_group *tg) { }
         |      ^~~~~~~~~~~~~~~~~~~
   kernel/sched/rt.c:263:5: warning: no previous prototype for 'alloc_rt_sched_group' [-Wmissing-prototypes]
     263 | int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
         |     ^~~~~~~~~~~~~~~~~~~~
>> kernel/sched/rt.c:2496:13: warning: no previous prototype for 'init_sched_rt_fitness_mask' [-Wmissing-prototypes]
    2496 | void __init init_sched_rt_fitness_mask(int cpu)
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~
--
   In file included from kernel/sched/build_utility.c:87:
   kernel/sched/cpupri.c: In function 'cpupri_find_fitness':
>> kernel/sched/cpupri.c:255:27: warning: array subscript 0 is outside array bounds of 'bool[0]' {aka '_Bool[]'} [-Warray-bounds]
     255 |         if (fallback_found[0]) {
         |             ~~~~~~~~~~~~~~^~~
   kernel/sched/cpupri.c:148:14: note: while referencing 'fallback_found'
     148 |         bool fallback_found[NUM_FITNESS_FN];
         |              ^~~~~~~~~~~~~~
   kernel/sched/cpupri.c:180:36: warning: array subscript 0 is outside array bounds of 'bool[0]' {aka '_Bool[]'} [-Warray-bounds]
     180 |                 if (!fallback_found[0]) {
         |                      ~~~~~~~~~~~~~~^~~
   kernel/sched/cpupri.c:148:14: note: while referencing 'fallback_found'
     148 |         bool fallback_found[NUM_FITNESS_FN];
         |              ^~~~~~~~~~~~~~
   kernel/sched/cpupri.c:182:47: warning: array subscript 0 is outside array bounds of 'bool[0]' {aka '_Bool[]'} [-Warray-bounds]
     182 |                                 fallback_found[0] = true;
         |                                 ~~~~~~~~~~~~~~^~~
   kernel/sched/cpupri.c:148:14: note: while referencing 'fallback_found'
     148 |         bool fallback_found[NUM_FITNESS_FN];
         |              ^~~~~~~~~~~~~~


vim +/init_sched_rt_fitness_mask +2496 kernel/sched/rt.c

  2495	
> 2496	void __init init_sched_rt_fitness_mask(int cpu)
  2497	{
  2498		cpumask_var_t *fitness_mask_array;
  2499		unsigned int i;
  2500	
  2501		if (!NUM_FITNESS_FN)
  2502			return;
  2503	
  2504		fitness_mask_array = kcalloc_node(NUM_FITNESS_FN, sizeof(cpumask_var_t),
  2505						  GFP_KERNEL, cpu_to_node(cpu));
  2506	
  2507		per_cpu(local_cpu_fitness_mask, cpu) = fitness_mask_array;
  2508	
  2509		for (i = 0; i < NUM_FITNESS_FN; i++) {
  2510			zalloc_cpumask_var_node(&fitness_mask_array[i], GFP_KERNEL,
  2511						cpu_to_node(cpu));
  2512		}
  2513	}
  2514	

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