[alexshi:schedtest 12/12] kernel/sched/fair.c:9748:34: error: call to undeclared function 'cpu_core_flags'; ISO C99 and later do not support implicit function declarations

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

tree:   https://github.com/alexshi/linux.git schedtest
head:   b92ab0e6c7d969d7c8b42f8a5ff7e1e73f63599b
commit: b92ab0e6c7d969d7c8b42f8a5ff7e1e73f63599b [12/12] sched/fair: change sched asym checking condition
config: x86_64-buildonly-randconfig-001-20240131 (https://download.01.org/0day-ci/archive/20240131/202401311339.WH2KXCdH-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240131/202401311339.WH2KXCdH-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/202401311339.WH2KXCdH-lkp@intel.com/

All errors (new ones prefixed by >>):

>> kernel/sched/fair.c:9748:34: error: call to undeclared function 'cpu_core_flags'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    9748 |                 (is_core_idle(cpu) && test_bit(cpu_core_flags(), (void*)&sd->flags));
         |                                                ^
   1 error generated.


vim +/cpu_core_flags +9748 kernel/sched/fair.c

  9730	
  9731	/**
  9732	 * sched_use_asym_prio - Check whether asym_packing priority must be used
  9733	 * @sd:		The scheduling domain of the load balancing
  9734	 * @cpu:	A CPU
  9735	 *
  9736	 * Always use CPU priority when balancing load between SMT siblings. When
  9737	 * balancing load between cores, it is not sufficient that @cpu is idle. Only
  9738	 * use CPU priority if the whole core is idle.
  9739	 *
  9740	 * Returns: True if the priority of @cpu must be followed. False otherwise.
  9741	 */
  9742	static bool sched_use_asym_prio(struct sched_domain *sd, int cpu)
  9743	{
  9744		if (!(sd->flags & SD_ASYM_PACKING))
  9745			return false;
  9746	
  9747		return (sd->flags & SD_SHARE_CPUCAPACITY) ||
> 9748			(is_core_idle(cpu) && test_bit(cpu_core_flags(), (void*)&sd->flags));
  9749	}
  9750	

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