kernel/resource.c:1838:43: warning: implicit conversion from 'unsigned long long' to 'resource_size_t' (aka 'unsigned int') changes value from 68719476735 to 4294967295

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   6f2a71a99ebd5dfaa7948a2e9c59eae94b741bd8
commit: 99185c10d5d9214d0d0c8b7866660203e344ee3b resource, kunit: add test case for region_intersects()
date:   9 months ago
config: arm-randconfig-2006-20250627 (https://download.01.org/0day-ci/archive/20250627/202506271014.vuMnyMSa-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250627/202506271014.vuMnyMSa-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/202506271014.vuMnyMSa-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from kernel/resource.c:21:
   In file included from include/linux/pseudo_fs.h:4:
   In file included from include/linux/fs_context.h:14:
   In file included from include/linux/security.h:33:
   In file included from include/linux/mm.h:2198:
   include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
>> kernel/resource.c:1838:43: warning: implicit conversion from 'unsigned long long' to 'resource_size_t' (aka 'unsigned int') changes value from 68719476735 to 4294967295 [-Wconstant-conversion]
    1838 |                 end = min_t(resource_size_t, base->end, MAX_PHYS_ADDR);
         |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
   kernel/resource.c:1827:52: note: expanded from macro 'MAX_PHYS_ADDR'
    1827 | #define MAX_PHYS_ADDR           ((1ULL << MAX_PHYSMEM_BITS) - 1)
         |                                                             ^
   include/linux/minmax.h:213:52: note: expanded from macro 'min_t'
     213 | #define min_t(type, x, y) __cmp_once(min, type, x, y)
         |                           ~~~~~~~~~~~~~~~~~~~~~~~~~^~
   include/linux/minmax.h:96:33: note: expanded from macro '__cmp_once'
      96 |         __cmp_once_unique(op, type, x, y, __UNIQUE_ID(x_), __UNIQUE_ID(y_))
         |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:93:31: note: expanded from macro '__cmp_once_unique'
      93 |         ({ type ux = (x); type uy = (y); __cmp(op, ux, uy); })
         |                                ~~    ^
   kernel/resource.c:1855:45: warning: implicit conversion from 'unsigned long long' to 'resource_size_t' (aka 'unsigned int') changes value from 68719476735 to 4294967295 [-Wconstant-conversion]
    1855 |                 addr <= min_t(resource_size_t, base->end, MAX_PHYS_ADDR);
         |                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
   kernel/resource.c:1827:52: note: expanded from macro 'MAX_PHYS_ADDR'
    1827 | #define MAX_PHYS_ADDR           ((1ULL << MAX_PHYSMEM_BITS) - 1)
         |                                                             ^
   include/linux/minmax.h:213:52: note: expanded from macro 'min_t'
     213 | #define min_t(type, x, y) __cmp_once(min, type, x, y)
         |                           ~~~~~~~~~~~~~~~~~~~~~~~~~^~
   include/linux/minmax.h:96:33: note: expanded from macro '__cmp_once'
      96 |         __cmp_once_unique(op, type, x, y, __UNIQUE_ID(x_), __UNIQUE_ID(y_))
         |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:93:31: note: expanded from macro '__cmp_once_unique'
      93 |         ({ type ux = (x); type uy = (y); __cmp(op, ux, uy); })
         |                                ~~    ^
   3 warnings generated.


vim +1838 kernel/resource.c

  1831	
  1832	static resource_size_t gfr_start(struct resource *base, resource_size_t size,
  1833					 resource_size_t align, unsigned long flags)
  1834	{
  1835		if (flags & GFR_DESCENDING) {
  1836			resource_size_t end;
  1837	
> 1838			end = min_t(resource_size_t, base->end, MAX_PHYS_ADDR);
  1839			return end - size + 1;
  1840		}
  1841	
  1842		return ALIGN(max(base->start, align), align);
  1843	}
  1844	

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