tree: https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/i2c/new_client_device head: 0a8ad6d10e079730b0c2c63997db1be3b3fc804d commit: 59978c54b4dc55bd0b00545d20aa43877e752d37 [25/28] iio: imu: inv_mpu6050: convert to use i2c_new_client_device() config: i386-allyesconfig (attached as .config) compiler: gcc-7 (Debian 7.5.0-5) 7.5.0 reproduce: git checkout 59978c54b4dc55bd0b00545d20aa43877e752d37 # save the attached .config to linux build tree make ARCH=i386 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): In file included from include/linux/acpi.h:32:0, from include/linux/i2c.h:13, from drivers/iio//imu/inv_mpu6050/inv_mpu_acpi.c:10: drivers/iio//imu/inv_mpu6050/inv_mpu_acpi.c: In function 'inv_mpu_acpi_create_mux_client': typeof(__fwnode) __to_acpi_device_node_fwnode = __fwnode; \ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/iio//imu/inv_mpu6050/inv_mpu_acpi.c:138:22: note: 'client' was declared here struct i2c_client *client; ^~~~~~ -- In file included from include/linux/acpi.h:32:0, from include/linux/i2c.h:13, from drivers/iio/imu/inv_mpu6050/inv_mpu_acpi.c:10: drivers/iio/imu/inv_mpu6050/inv_mpu_acpi.c: In function 'inv_mpu_acpi_create_mux_client': typeof(__fwnode) __to_acpi_device_node_fwnode = __fwnode; \ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/iio/imu/inv_mpu6050/inv_mpu_acpi.c:138:22: note: 'client' was declared here struct i2c_client *client; ^~~~~~ vim +/client +406 include/acpi/acpi_bus.h 8a0662d9ed2968 Rafael J. Wysocki 2014-11-04 403 8b9d6802583a1e Sakari Ailus 2017-07-21 404 #define to_acpi_device_node(__fwnode) \ 8b9d6802583a1e Sakari Ailus 2017-07-21 405 ({ \ 8b9d6802583a1e Sakari Ailus 2017-07-21 @406 typeof(__fwnode) __to_acpi_device_node_fwnode = __fwnode; \ 8b9d6802583a1e Sakari Ailus 2017-07-21 407 \ 8b9d6802583a1e Sakari Ailus 2017-07-21 408 is_acpi_device_node(__to_acpi_device_node_fwnode) ? \ 8b9d6802583a1e Sakari Ailus 2017-07-21 409 container_of(__to_acpi_device_node_fwnode, \ 8b9d6802583a1e Sakari Ailus 2017-07-21 410 struct acpi_device, fwnode) : \ 8b9d6802583a1e Sakari Ailus 2017-07-21 411 NULL; \ 8b9d6802583a1e Sakari Ailus 2017-07-21 412 }) 8b9d6802583a1e Sakari Ailus 2017-07-21 413 :::::: The code at line 406 was first introduced by commit :::::: 8b9d6802583a1ef6977e4b059f9fa848e6882253 ACPI: Constify acpi_bus helper functions, switch to macros :::::: TO: Sakari Ailus <sakari.ailus(a)linux.intel.com&gt; :::::: CC: Rafael J. Wysocki <rafael.j.wysocki(a)intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org