Re: [PATCH 2/4 v5] cxl/core: Add helpers to detect Low Memory Holes on x86

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

Hi Fabio,

kernel test robot noticed the following build errors:

[auto build test ERROR on 46037455cbb748c5e85071c95f2244e81986eb58]

url:    https://github.com/intel-lab-lkp/linux/commits/Fabio-M-De-Francesco/cxl-core-Change-match_-_by_range-signatures/20251010-111627
base:   46037455cbb748c5e85071c95f2244e81986eb58
patch link:    https://lore.kernel.org/r/20251006155836.791418-3-fabio.m.de.francesco%40linux.intel.com
patch subject: [PATCH 2/4 v5] cxl/core: Add helpers to detect Low Memory Holes on x86
config: i386-buildonly-randconfig-005-20251010 (https://download.01.org/0day-ci/archive/20251010/202510101555.zofjGvZF-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251010/202510101555.zofjGvZF-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/202510101555.zofjGvZF-lkp@intel.com/

All errors (new ones prefixed by >>):

   ld: drivers/cxl/core/platform_quirks.o: in function `platform_res_adjust':
>> drivers/cxl/core/platform_quirks.c:95:(.text+0x1f1): undefined reference to `__udivdi3'


vim +95 drivers/cxl/core/platform_quirks.c

    76	
    77	void platform_res_adjust(struct resource *res,
    78				 struct cxl_endpoint_decoder *cxled,
    79				 const struct cxl_root_decoder *cxlrd)
    80	{
    81		if (!platform_cxlrd_matches_cxled(cxlrd, cxled))
    82			return;
    83	
    84		guard(rwsem_write)(&cxl_rwsem.dpa);
    85		dev_dbg(cxled_to_memdev(cxled)->dev.parent,
    86			"Low Memory Hole detected. Resources were (%s: %pr, %pr)\n",
    87			dev_name(&cxled->cxld.dev), res, cxled->dpa_res);
    88		if (res) {
    89			/* Trim region resource overlap with LMH */
    90			res->end = cxlrd->res->end;
    91		}
    92		/* Match endpoint decoder's DPA resource to root decoder's */
    93		cxled->dpa_res->end =
    94			cxled->dpa_res->start +
  > 95			resource_size(cxlrd->res) / cxled->cxld.interleave_ways - 1;

-- 
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