[PATCH v3 1/2] ACPI: utils: Add api to read _SUB from ACPI

[kernel test robot]

Hi Stefan,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on rafael-pm/linux-next]
[also build test WARNING on broonie-sound/for-next linus/master v5.19-rc4 next-20220627]
[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]

url:    https://github.com/intel-lab-lkp/linux/commits/Stefan-Binding/Read-_SUB-from-ACPI-to-be-able-to-identify-firmware/20220627-235448
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
config: x86_64-defconfig (https://download.01.org/0day-ci/archive/20220628/202206280722.5wvfmDeu-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/7dd124b65442fd6622e7df2949795f735d8356be
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Stefan-Binding/Read-_SUB-from-ACPI-to-be-able-to-identify-firmware/20220627-235448
        git checkout 7dd124b65442fd6622e7df2949795f735d8356be
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/acpi/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp at intel.com>

All warnings (new ones prefixed by >>):

   In file included from drivers/acpi/utils.c:17:
   drivers/acpi/utils.c: In function 'acpi_get_subsystem_id':
>> drivers/acpi/utils.c:317:49: warning: format '%d' expects argument of type 'int', but argument 4 has type 'size_t' {aka 'long unsigned int'} [-Wformat=]
     317 |                         acpi_handle_err(handle, "ACPI _SUB Length %d is Invalid\n",
         |                                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     318 |                                         strlen(obj->string.pointer));
         |                                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~
         |                                         |
         |                                         size_t {aka long unsigned int}
   include/linux/acpi.h:1172:46: note: in definition of macro 'acpi_handle_err'
    1172 |         acpi_handle_printk(KERN_ERR, handle, fmt, ##__VA_ARGS__)
         |                                              ^~~
   drivers/acpi/utils.c:317:68: note: format string is defined here
     317 |                         acpi_handle_err(handle, "ACPI _SUB Length %d is Invalid\n",
         |                                                                   ~^
         |                                                                    |
         |                                                                    int
         |                                                                   %ld


vim +317 drivers/acpi/utils.c

   295	
   296	const char *acpi_get_subsystem_id(acpi_handle handle)
   297	{
   298		struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
   299		union acpi_object *obj;
   300		acpi_status status;
   301		const char *sub;
   302	
   303		status = acpi_evaluate_object(handle, METHOD_NAME__SUB, NULL, &buffer);
   304		if (ACPI_FAILURE(status)) {
   305			acpi_handle_debug(handle, "Reading ACPI _SUB failed: %#x\n", status);
   306			return ERR_PTR(-ENODATA);
   307		}
   308	
   309		obj = buffer.pointer;
   310		if (obj->type == ACPI_TYPE_STRING) {
   311			if (strlen(obj->string.pointer) < ACPI_MAX_SUB_BUF_SIZE &&
   312			    strlen(obj->string.pointer) > 0) {
   313				sub = kstrdup(obj->string.pointer, GFP_KERNEL);
   314				if (!sub)
   315					sub = ERR_PTR(-ENOMEM);
   316			} else {
 > 317				acpi_handle_err(handle, "ACPI _SUB Length %d is Invalid\n",
   318						strlen(obj->string.pointer));
   319				sub = ERR_PTR(-EINVAL);
   320			}
   321		} else {
   322			acpi_handle_warn(handle, "Warning ACPI _SUB did not return a string\n");
   323			sub = ERR_PTR(-EINVAL);
   324		}
   325	
   326		acpi_os_free(buffer.pointer);
   327	
   328		return sub;
   329	}
   330	EXPORT_SYMBOL_GPL(acpi_get_subsystem_id);
   331	

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