[morse:mpam/snapshot/v6.12-rc1 76/132] drivers/platform/arm64/mpam/mpam_devices.c:356:17: warning: result of comparison of constant 18446744073709551615 with expression of type 'u32' (aka 'unsigned int') is always false

[morse:mpam/snapshot/v6.12-rc1 76/132] drivers/platform/arm64/mpam/mpam_devices.c:356:17: warning: result of comparison of constant 18446744073709551615 with expression of type 'u32' (aka 'unsigned int') is always false

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git mpam/snapshot/v6.12-rc1
head:   4d17b37b670795954fd7a70c8ec83fb705a5e2ad
commit: cef6f9417b171fcf4f80d9283c16686b5bd5ffea [76/132] arm_mpam: Add the class and component structures for ris firmware described
config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20241008/202410081031.8bueUllP-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project fef3566a25ff0e34fb87339ba5e13eca17cec00f)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241008/202410081031.8bueUllP-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/202410081031.8bueUllP-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/platform/arm64/mpam/mpam_devices.c:6:
   In file included from include/linux/acpi.h:39:
   In file included from include/acpi/acpi_io.h:7:
   In file included from arch/arm64/include/asm/acpi.h:14:
   In file included from include/linux/memblock.h:12:
   In file included from include/linux/mm.h:2213:
   include/linux/vmstat.h:504:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     504 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     505 |                            item];
         |                            ~~~~
   include/linux/vmstat.h:511:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     511 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     512 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   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_"
         |                               ~~~~~~~~~~~ ^ ~~~
   include/linux/vmstat.h:524:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     524 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     525 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
>> drivers/platform/arm64/mpam/mpam_devices.c:356:17: warning: result of comparison of constant 18446744073709551615 with expression of type 'u32' (aka 'unsigned int') is always false [-Wtautological-constant-out-of-range-compare]
     356 |                         if (cache_id == ~0UL) {
         |                             ~~~~~~~~ ^  ~~~~
   5 warnings generated.

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for MODVERSIONS
   Depends on [n]: MODULES [=y] && !COMPILE_TEST [=y]
   Selected by [y]:
   - RANDSTRUCT_FULL [=y] && (CC_HAS_RANDSTRUCT [=y] || GCC_PLUGINS [=n]) && MODULES [=y]


vim +356 drivers/platform/arm64/mpam/mpam_devices.c

   320	
   321	/*
   322	 * The cacheinfo structures are only populated when CPUs are online.
   323	 * This helper walks the device tree to include offline CPUs too.
   324	 */
   325	static int get_cpumask_from_cache_id(u32 cache_id, u32 cache_level,
   326					     cpumask_t *affinity)
   327	{
   328		int cpu, err;
   329		u32 iter_level;
   330		int iter_cache_id;
   331		struct device_node *iter;
   332	
   333		if (!acpi_disabled)
   334			return acpi_pptt_get_cpumask_from_cache_id(cache_id, affinity);
   335	
   336		for_each_possible_cpu(cpu) {
   337			iter = of_get_cpu_node(cpu, NULL);
   338			if (!iter) {
   339				pr_err("Failed to find cpu%d device node\n", cpu);
   340				return -ENOENT;
   341			}
   342	
   343			while ((iter = of_find_next_cache_node(iter))) {
   344				err = of_property_read_u32(iter, "cache-level",
   345							   &iter_level);
   346				if (err || (iter_level != cache_level)) {
   347					of_node_put(iter);
   348					continue;
   349				}
   350	
   351				/*
   352				 * get_cpu_cacheinfo_id() isn't ready until sometime
   353				 * during device_initcall(). Use cache_of_get_id().
   354				 */
   355				iter_cache_id = cache_of_get_id(iter);
 > 356				if (cache_id == ~0UL) {
   357					of_node_put(iter);
   358					continue;
   359				}
   360	
   361				if (iter_cache_id == cache_id)
   362					cpumask_set_cpu(cpu, affinity);
   363	
   364				of_node_put(iter);
   365			}
   366		}
   367	
   368		return 0;
   369	}
   370	

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