linux-kernel - [ammarfaizi2-block:google/android/kernel/common/deprecated/android-4.9-p-release 6326/9999] kernel/sched/fair.c:5431:15: warning: no previous declaration for 'capacity_min

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Date:   Thu, 3 Mar 2022 09:15:09 +0800
From:   kernel test robot <lkp@...el.com>
To:     Ionela Voinescu <ionela.voinescu@....com>
Cc:     kbuild-all@...ts.01.org,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org,
        Quentin Perret <quentin.perret@....com>,
        Chris Redpath <chris.redpath@....com>
Subject: [ammarfaizi2-block:google/android/kernel/common/deprecated/android-4.9-p-release
 6326/9999] kernel/sched/fair.c:5431:15: warning: no previous declaration for
 'capacity_min_of'

Hi Ionela,

FYI, the error/warning still remains.

tree:   https://github.com/ammarfaizi2/linux-block google/android/kernel/common/deprecated/android-4.9-p-release
head:   74f5cdd2ad41ea660f18bcaf7ce3d8d3e8e88428
commit: 58b761f4c089c6138195334ebd5b1c880e502551 [6326/9999] sched/fair: introduce minimum capacity capping sched feature
config: i386-randconfig-r034-20211122 (https://download.01.org/0day-ci/archive/20220303/202203030914.dPl5K6Z8-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build):
        # https://github.com/ammarfaizi2/linux-block/commit/58b761f4c089c6138195334ebd5b1c880e502551
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block google/android/kernel/common/deprecated/android-4.9-p-release
        git checkout 58b761f4c089c6138195334ebd5b1c880e502551
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash kernel/bpf/ kernel/sched/

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/fair.c:23:0:
   include/linux/sched.h:1260:1: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
    const struct sched_group_energy * const(*sched_domain_energy_f)(int cpu);
    ^~~~~
   kernel/sched/fair.c:3438:6: warning: no previous declaration for 'sync_entity_load_avg' [-Wmissing-declarations]
    void sync_entity_load_avg(struct sched_entity *se)
         ^~~~~~~~~~~~~~~~~~~~
   kernel/sched/fair.c:3451:6: warning: no previous declaration for 'remove_entity_load_avg' [-Wmissing-declarations]
    void remove_entity_load_avg(struct sched_entity *se)
         ^~~~~~~~~~~~~~~~~~~~~~
>> kernel/sched/fair.c:5431:15: warning: no previous declaration for 'capacity_min_of' [-Wmissing-declarations]
    unsigned long capacity_min_of(int cpu)
                  ^~~~~~~~~~~~~~~
   kernel/sched/fair.c: In function 'find_best_target':
   kernel/sched/fair.c:6703:16: warning: variable 'target_util' set but not used [-Wunused-but-set-variable]
     unsigned long target_util = ULONG_MAX;
                   ^~~~~~~~~~~
   kernel/sched/fair.c: In function 'select_energy_cpu_brute':
   kernel/sched/fair.c:5873:11: warning: array subscript is above array bounds [-Warray-bounds]
     eenv->cpu[cpu_idx].nrg_delta = 0;
     ~~~~~~~~~^~~~~~~~~
   arch/x86/include/asm/bitops.h: Assembler messages:
   arch/x86/include/asm/bitops.h:211: Warning: no instruction mnemonic suffix given and no register operands; using default for `bts'


vim +/capacity_min_of +5431 kernel/sched/fair.c

  5426	
  5427	/*
  5428	 * Returns the current capacity of cpu after applying both
  5429	 * cpu and min freq scaling.
  5430	 */
> 5431	unsigned long capacity_min_of(int cpu)
  5432	{
  5433		if (!sched_feat(MIN_CAPACITY_CAPPING))
  5434			return 0;
  5435		return arch_scale_cpu_capacity(NULL, cpu) *
  5436		       arch_scale_min_freq_capacity(NULL, cpu)
  5437		       >> SCHED_CAPACITY_SHIFT;
  5438	}
  5439	

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