Hi Anshuman,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.5-rc5 next-20200110]
[cannot apply to arm64/for-next/core robh/for-next linux/master]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Anshuman-Khandual/arm64-mm-Enable-memory-hot-remove/20200111-003854
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 4a3033ef6e6bb4c566bd1d556de69b494d76976c
config: arm64-randconfig-a001-20200109 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 7.5.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.5.0 make.cross ARCH=arm64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   mm/memory_hotplug.c: In function 'check_hotremove_memory_range':
>> mm/memory_hotplug.c:1027:7: error: implicit declaration of function 'arch_memory_removable'; did you mean 'add_memory_resource'? [-Werror=implicit-function-declaration]
     rc = arch_memory_removable(start, size);
          ^~~~~~~~~~~~~~~~~~~~~
          add_memory_resource
   At top level:
   mm/memory_hotplug.c:1017:12: warning: 'check_hotremove_memory_range' defined but not used [-Wunused-function]
    static int check_hotremove_memory_range(u64 start, u64 size)
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +1027 mm/memory_hotplug.c

  1016	
  1017	static int check_hotremove_memory_range(u64 start, u64 size)
  1018	{
  1019		int rc;
  1020	
  1021		BUG_ON(check_hotplug_memory_range(start, size));
  1022	
  1023		/*
  1024		 * First check if the platform is willing to have this
  1025		 * memory range removed else just abort.
  1026		 */
> 1027		rc = arch_memory_removable(start, size);
  1028		if (!rc)
  1029			return -EINVAL;
  1030	
  1031		return 0;
  1032	}
  1033	

---
0-DAY kernel test infrastructure                 Open Source Technology Center
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation