Hi Maximilian, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 61556703b610a104de324e4f061dc6cf7b218b46 commit: f23027ca3d48b6f93c5994069fb25b73539fdf34 platform/surface: Move Surface 3 WMI driver to platform/surface date: 4 months ago config: i386-randconfig-r016-20210209 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout f23027ca3d48b6f93c5994069fb25b73539fdf34 # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): drivers/platform/surface/surface3-wmi.c: In function 's3_wmi_query_block': 60 | acpi_status status; | ^~~~~~ vim +/status +60 drivers/platform/surface/surface3-wmi.c 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 56 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 57 static int s3_wmi_query_block(const char *guid, int instance, int *ret) 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 58 { 83da6b59919a71 drivers/platform/x86/surface3-wmi.c Andy Shevchenko 2016-12-15 59 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 @60 acpi_status status; 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 61 union acpi_object *obj; 83da6b59919a71 drivers/platform/x86/surface3-wmi.c Andy Shevchenko 2016-12-15 62 int error = 0; 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 63 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 64 mutex_lock(&s3_wmi_lock); 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 65 status = wmi_query_block(guid, instance, &output); 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 66 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 67 obj = output.pointer; 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 68 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 69 if (!obj || obj->type != ACPI_TYPE_INTEGER) { 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 70 if (obj) { 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 71 pr_err("query block returned object type: %d - buffer length:%d\n", 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 72 obj->type, 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 73 obj->type == ACPI_TYPE_BUFFER ? 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 74 obj->buffer.length : 0); 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 75 } 83da6b59919a71 drivers/platform/x86/surface3-wmi.c Andy Shevchenko 2016-12-15 76 error = -EINVAL; 83da6b59919a71 drivers/platform/x86/surface3-wmi.c Andy Shevchenko 2016-12-15 77 goto out_free_unlock; 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 78 } 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 79 *ret = obj->integer.value; 83da6b59919a71 drivers/platform/x86/surface3-wmi.c Andy Shevchenko 2016-12-15 80 out_free_unlock: 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 81 kfree(obj); 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 82 mutex_unlock(&s3_wmi_lock); 83da6b59919a71 drivers/platform/x86/surface3-wmi.c Andy Shevchenko 2016-12-15 83 return error; 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 84 } 3dda3b3798f96d drivers/platform/x86/surface3-wmi.c Benjamin Tissoires 2016-11-25 85 :::::: The code at line 60 was first introduced by commit :::::: 3dda3b3798f96d2974b5f60811142d3e25547807 platform/x86: Add custom surface3 platform device for controlling LID :::::: TO: Benjamin Tissoires <benjamin.tissoires(a)redhat.com&gt; :::::: CC: Andy Shevchenko <andriy.shevchenko(a)linux.intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org