mm/mm_init.c:2691:2: error: call to undeclared function 'kho_extend_scratch'; ISO C99 and later do not support implicit function declarations

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

tree:   https://github.com/intel-lab-lkp/linux/commits/Pratyush-Yadav/kho-generalize-radix-tree-APIs/20260430-095605
head:   a586b345757dd389b6a3981b387cc4b39c538fab
commit: a29db33861c799b78a6469b22301aace345ad455 kho: extended scratch
date:   6 hours ago
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20260430/202604300954.lysOjEtq-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260430/202604300954.lysOjEtq-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/202604300954.lysOjEtq-lkp@intel.com/

All errors (new ones prefixed by >>):

>> mm/mm_init.c:2691:2: error: call to undeclared function 'kho_extend_scratch'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    2691 |         kho_extend_scratch();
         |         ^
   1 error generated.


vim +/kho_extend_scratch +2691 mm/mm_init.c

  2688	
  2689	void __init mm_core_init_early(void)
  2690	{
> 2691		kho_extend_scratch();
  2692		hugetlb_cma_reserve();
  2693		hugetlb_bootmem_alloc();
  2694	
  2695		free_area_init();
  2696	}
  2697	

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