Re: [PATCH v2 5/9] ACPI: APEI: EINJ: Enable the discovery of EINJv2 capabilities

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

Hi Zaid,

kernel test robot noticed the following build warnings:

[auto build test WARNING on rafael-pm/linux-next]
[also build test WARNING on rafael-pm/bleeding-edge linus/master v6.13-rc1 next-20241205]
[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/Zaid-Alali/ACPICA-Update-values-to-hex-to-follow-ACPI-specs/20241206-052420
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
patch link:    https://lore.kernel.org/r/20241205211854.43215-6-zaidal%40os.amperecomputing.com
patch subject: [PATCH v2 5/9] ACPI: APEI: EINJ: Enable the discovery of EINJv2 capabilities
config: i386-buildonly-randconfig-005-20241206 (https://download.01.org/0day-ci/archive/20241206/202412061210.H6R0JvCL-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241206/202412061210.H6R0JvCL-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/202412061210.H6R0JvCL-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/acpi/apei/einj-core.c:23:
   In file included from include/linux/mm.h:2223:
   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_"
         |                               ~~~~~~~~~~~ ^ ~~~
   drivers/acpi/apei/einj-core.c:342:6: warning: variable 'p' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
     342 |         if (!r) {
         |             ^~
   drivers/acpi/apei/einj-core.c:440:6: note: uninitialized use occurs here
     440 |         if (p)
         |             ^
   drivers/acpi/apei/einj-core.c:342:2: note: remove the 'if' if its condition is always false
     342 |         if (!r) {
         |         ^~~~~~~~~
     343 |                 pr_err("Can not request [mem %#010llx-%#010llx] for Trigger table\n",
         |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     344 |                        (unsigned long long)trigger_paddr,
         |                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     345 |                        (unsigned long long)trigger_paddr +
         |                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     346 |                             sizeof(*trigger_tab) - 1);
         |                             ~~~~~~~~~~~~~~~~~~~~~~~~~~
     347 |                 goto out;
         |                 ~~~~~~~~~
     348 |         }
         |         ~
   drivers/acpi/apei/einj-core.c:338:17: note: initialize the variable 'p' to silence this warning
     338 |         void __iomem *p;
         |                        ^
         |                         = NULL
>> drivers/acpi/apei/einj-core.c:728:29: warning: 'memset' call operates on objects of type 'char' while the size is based on a different type 'char *' [-Wsizeof-pointer-memaccess]
     728 |         memset(einj_buf, 0, sizeof(einj_buf));
         |                ~~~~~~~~            ^~~~~~~~
   drivers/acpi/apei/einj-core.c:728:29: note: did you mean to provide an explicit length?
     728 |         memset(einj_buf, 0, sizeof(einj_buf));
         |                                    ^~~~~~~~
   3 warnings generated.


vim +728 drivers/acpi/apei/einj-core.c

   721	
   722	static ssize_t error_type_set(struct file *file, const char __user *buf,
   723					size_t count, loff_t *ppos)
   724	{
   725		int rc;
   726		u64 val;
   727	
 > 728		memset(einj_buf, 0, sizeof(einj_buf));
   729		if (copy_from_user(einj_buf, buf, count))
   730			return -EFAULT;
   731	
   732		if (strncmp(einj_buf, "V2_", 3) == 0) {
   733			if (!sscanf(einj_buf, "V2_%llx", &val))
   734				return -EINVAL;
   735		} else
   736			if (!sscanf(einj_buf, "%llx", &val))
   737				return -EINVAL;
   738	
   739		rc = einj_validate_error_type(val);
   740		if (rc)
   741			return rc;
   742	
   743		error_type = val;
   744	
   745		return count;
   746	}
   747	

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