Re: [PATCH v4 3/9] ACPI: APEI: EINJ: Fix kernel test robot sparse warning

[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 v6.14-rc5 next-20250307]
[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/20250307-075155
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
patch link:    https://lore.kernel.org/r/20250306234810.75511-4-zaidal%40os.amperecomputing.com
patch subject: [PATCH v4 3/9] ACPI: APEI: EINJ: Fix kernel test robot sparse warning
config: i386-randconfig-063-20250308 (https://download.01.org/0day-ci/archive/20250308/202503081600.JxR875hh-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250308/202503081600.JxR875hh-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/202503081600.JxR875hh-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/acpi/apei/einj-core.c:265:32: sparse: sparse: incorrect type in return expression (different address spaces) @@     expected void * @@     got void [noderef] __iomem *[assigned] p @@
   drivers/acpi/apei/einj-core.c:265:32: sparse:     expected void *
   drivers/acpi/apei/einj-core.c:265:32: sparse:     got void [noderef] __iomem *[assigned] p
   drivers/acpi/apei/einj-core.c:280:24: sparse: sparse: incorrect type in return expression (different address spaces) @@     expected void * @@     got void [noderef] __iomem *[assigned] p @@
   drivers/acpi/apei/einj-core.c:280:24: sparse:     expected void *
   drivers/acpi/apei/einj-core.c:280:24: sparse:     got void [noderef] __iomem *[assigned] p
>> drivers/acpi/apei/einj-core.c:824:20: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void [noderef] __iomem *static [toplevel] einj_param @@     got void * @@
   drivers/acpi/apei/einj-core.c:824:20: sparse:     expected void [noderef] __iomem *static [toplevel] einj_param
   drivers/acpi/apei/einj-core.c:824:20: sparse:     got void *

vim +265 drivers/acpi/apei/einj-core.c

   235	
   236	static void *einj_get_parameter_address(void)
   237	{
   238		int i;
   239		u64 pa_v4 = 0, pa_v5 = 0;
   240		struct acpi_whea_header *entry;
   241	
   242		entry = EINJ_TAB_ENTRY(einj_tab);
   243		for (i = 0; i < einj_tab->entries; i++) {
   244			if (entry->action == ACPI_EINJ_SET_ERROR_TYPE &&
   245			    entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
   246			    entry->register_region.space_id ==
   247			    ACPI_ADR_SPACE_SYSTEM_MEMORY)
   248				pa_v4 = get_unaligned(&entry->register_region.address);
   249			if (entry->action == ACPI_EINJ_SET_ERROR_TYPE_WITH_ADDRESS &&
   250			    entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
   251			    entry->register_region.space_id ==
   252			    ACPI_ADR_SPACE_SYSTEM_MEMORY)
   253				pa_v5 = get_unaligned(&entry->register_region.address);
   254			entry++;
   255		}
   256		if (pa_v5) {
   257			struct set_error_type_with_address v5param;
   258			void __iomem *p;
   259	
   260			p = acpi_os_map_iomem(pa_v5, sizeof(v5param));
   261			if (p) {
   262				memcpy_fromio(&v5param, p, sizeof(v5param));
   263				acpi5 = 1;
   264				check_vendor_extension(pa_v5, &v5param);
 > 265				return p;
   266			}
   267		}
   268		if (param_extension && pa_v4) {
   269			struct einj_parameter v4param;
   270			void __iomem *p;
   271	
   272			p = acpi_os_map_iomem(pa_v4, sizeof(v4param));
   273			if (!p)
   274				return NULL;
   275			memcpy_fromio(&v4param, p, sizeof(v4param));
   276			if (v4param.reserved1 || v4param.reserved2) {
   277				acpi_os_unmap_iomem(p, sizeof(v4param));
   278				return NULL;
   279			}
   280			return p;
   281		}
   282	
   283		return NULL;
   284	}
   285	

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