[qais-yousef:remove-margins 2/2] kernel/sched/fair.c:165:15: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int

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

tree:   https://github.com/qais-yousef/linux remove-margins
head:   f49a0141f6fa8e9f6dd3b8cacae3531f90c74343
commit: f49a0141f6fa8e9f6dd3b8cacae3531f90c74343 [2/2] sched/fair: Remove magic margin in fits_capacity()
config: powerpc-randconfig-r026-20230718 (https://download.01.org/0day-ci/archive/20230719/202307191211.oFljVu7F-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20230719/202307191211.oFljVu7F-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/202307191211.oFljVu7F-lkp@intel.com/

All errors (new ones prefixed by >>):

>> kernel/sched/fair.c:165:15: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
     165 | static inline fits_capacity(unsigned long util, unsigned long capacity)
         | ~~~~~~~~~~~~~ ^
         | int
>> kernel/sched/fair.c:167:9: error: call to undeclared function 'approximate_util_avg'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     167 |         return approximate_util_avg(util, TICK_NSEC) < capacity;
         |                ^
   2 errors generated.


vim +/int +165 kernel/sched/fair.c

   150	
   151	/*
   152	 * The util will fit the capacity if it has enough headroom to grow within the
   153	 * next tick - which is when any load balancing activity happens to do the
   154	 * correction.
   155	 *
   156	 * If util stays within the capacity before tick has elapsed, then it should be
   157	 * fine. If not, then a correction action must happen shortly after it starts
   158	 * running, hence we treat it as !fit.
   159	 *
   160	 * TODO: TICK is not actually accurate enough. balance_interval is the correct
   161	 * one to use as the next load balance doesn't not happen religiously at tick.
   162	 * Accessing balance_interval might be tricky and will require some refactoring
   163	 * first.
   164	 */
 > 165	static inline fits_capacity(unsigned long util, unsigned long capacity)
   166	{
 > 167		return approximate_util_avg(util, TICK_NSEC) < capacity;
   168	}
   169	

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