Re: [PATCH v2 2/2] hv_balloon: Enable hot-add for memblock sizes > 128 MiB

[kernel test robot]

Hi,

kernel test robot noticed the following build errors:

[auto build test ERROR on linus/master]
[also build test ERROR on v6.9-rc6 next-20240502]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/mhkelley58-gmail-com/hv_balloon-Enable-hot-add-for-memblock-sizes-128-MiB/20240501-232643
base:   linus/master
patch link:    https://lore.kernel.org/r/20240501151458.2807-2-mhklinux%40outlook.com
patch subject: [PATCH v2 2/2] hv_balloon: Enable hot-add for memblock sizes > 128 MiB
config: i386-randconfig-011-20240502 (https://download.01.org/0day-ci/archive/20240503/202405030421.x7E4hUI7-lkp@xxxxxxxxx/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240503/202405030421.x7E4hUI7-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405030421.x7E4hUI7-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

   ld: drivers/hv/hv_balloon.o: in function `init_balloon_drv':
>> drivers/hv/hv_balloon.c:2147:(.init.text+0x4): undefined reference to `memory_block_size_bytes'


vim +2147 drivers/hv/hv_balloon.c

  2136	
  2137	static int __init init_balloon_drv(void)
  2138	{
  2139		/*
  2140		 * Hot-add must operate in chunks that are of size
  2141		 * equal to the memory block size because that's
  2142		 * what the core add_memory() interface requires.
  2143		 * The Hyper-V interface requires that the memory block
  2144		 * size be a power of 2, which is guaranteed by the
  2145		 * check in memory_dev_init().
  2146		 */
> 2147		ha_pages_in_chunk = memory_block_size_bytes() / PAGE_SIZE;
  2148	
  2149		return vmbus_driver_register(&balloon_drv);
  2150	}
  2151	

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