[akpm-mm:mm-new 301/316] mm/memory_hotplug.c:1507:13: warning: 'node_is_memoryless' defined but not used

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

Hi Gregory,

FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-new
head:   e3fc12b08aadde9cec7b3799ac0e0c9a1aa245c4
commit: 77a622e07892674da28eb3ad349ddd96df10aded [301/316] mm/memory_hotplug: factor out node_is_memoryless()
config: x86_64-randconfig-161-20260904 (https://download.01.org/0day-ci/archive/20260905/202609050628.ywCLhOj5-lkp@intel.com/config)
compiler: gcc-13 (Debian 13.3.0-16) 13.3.0
smatch: v0.5.0-9187-g5189e3fb
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260905/202609050628.ywCLhOj5-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/202609050628.ywCLhOj5-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/memory_hotplug.c:1507:13: warning: 'node_is_memoryless' defined but not used [-Wunused-function]
    1507 | static bool node_is_memoryless(int nid)
         |             ^~~~~~~~~~~~~~~~~~


vim +/node_is_memoryless +1507 mm/memory_hotplug.c

  1505	
  1506	/* Caller must hold the memory hotplug lock for this check. */
> 1507	static bool node_is_memoryless(int nid)
  1508	{
  1509		/*
  1510		 * A node still spanning pages (especially ZONE_DEVICE) is not
  1511		 * memoryless.  A node spans memory after move_pfn_range_to_zone(),
  1512		 * e.g. once a memory block has been onlined.
  1513		 */
  1514		if (node_spanned_pages(nid))
  1515			return false;
  1516		/*
  1517		 * Offline memory blocks may not be spanned by the node yet, but they
  1518		 * link to it in sysfs and can be onlined later, so the node is not
  1519		 * memoryless while any remain.
  1520		 */
  1521		return !for_each_memory_block(&nid, check_no_memblock_for_node_cb);
  1522	}
  1523	

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