tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 071a0578b0ce0b0e543d1e38ee6926b9cc21c198 commit: f0fe00d4972a8cd4b98cc2c29758615e4d51cdfe security: allow using Clang's zero initialization for stack variables date: 4 months ago config: x86_64-randconfig-a012-20201017 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project efd02c1548ee458d59063f6393e94e972b5c3d50) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # 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 f0fe00d4972a8cd4b98cc2c29758615e4d51cdfe # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 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 >>): static int mt9t112_init_camera(const struct i2c_client *client) ^ 1 warning generated. vim +/mt9t112_init_camera +670 drivers/media/i2c/mt9t112.c 7641b04421954ea Jacopo Mondi 2018-03-12 669 7641b04421954ea Jacopo Mondi 2018-03-12 @670 static int mt9t112_init_camera(const struct i2c_client *client) 7641b04421954ea Jacopo Mondi 2018-03-12 671 { 7641b04421954ea Jacopo Mondi 2018-03-12 672 int ret; 7641b04421954ea Jacopo Mondi 2018-03-12 673 7641b04421954ea Jacopo Mondi 2018-03-12 674 ECHECKER(ret, mt9t112_reset(client)); 7641b04421954ea Jacopo Mondi 2018-03-12 675 ECHECKER(ret, mt9t112_init_pll(client)); 7641b04421954ea Jacopo Mondi 2018-03-12 676 ECHECKER(ret, mt9t112_init_setting(client)); 7641b04421954ea Jacopo Mondi 2018-03-12 677 ECHECKER(ret, mt9t112_auto_focus_setting(client)); 7641b04421954ea Jacopo Mondi 2018-03-12 678 7641b04421954ea Jacopo Mondi 2018-03-12 679 mt9t112_reg_mask_set(ret, client, 0x0018, 0x0004, 0); 7641b04421954ea Jacopo Mondi 2018-03-12 680 6a26f141bf6200a Jacopo Mondi 2018-03-12 681 /* Analog setting B.*/ 7641b04421954ea Jacopo Mondi 2018-03-12 682 mt9t112_reg_write(ret, client, 0x3084, 0x2409); 7641b04421954ea Jacopo Mondi 2018-03-12 683 mt9t112_reg_write(ret, client, 0x3092, 0x0A49); 7641b04421954ea Jacopo Mondi 2018-03-12 684 mt9t112_reg_write(ret, client, 0x3094, 0x4949); 7641b04421954ea Jacopo Mondi 2018-03-12 685 mt9t112_reg_write(ret, client, 0x3096, 0x4950); 7641b04421954ea Jacopo Mondi 2018-03-12 686 7641b04421954ea Jacopo Mondi 2018-03-12 687 /* 6a26f141bf6200a Jacopo Mondi 2018-03-12 688 * Disable adaptive clock. 7641b04421954ea Jacopo Mondi 2018-03-12 689 * PRI_A_CONFIG_JPEG_OB_TX_CONTROL_VAR 7641b04421954ea Jacopo Mondi 2018-03-12 690 * PRI_B_CONFIG_JPEG_OB_TX_CONTROL_VAR 7641b04421954ea Jacopo Mondi 2018-03-12 691 */ 7641b04421954ea Jacopo Mondi 2018-03-12 692 mt9t112_mcu_write(ret, client, VAR(26, 160), 0x0A2E); 7641b04421954ea Jacopo Mondi 2018-03-12 693 mt9t112_mcu_write(ret, client, VAR(27, 160), 0x0A2E); 7641b04421954ea Jacopo Mondi 2018-03-12 694 6a26f141bf6200a Jacopo Mondi 2018-03-12 695 /* 6a26f141bf6200a Jacopo Mondi 2018-03-12 696 * Configure Status in Status_before_length Format and enable header. 6a26f141bf6200a Jacopo Mondi 2018-03-12 697 * PRI_B_CONFIG_JPEG_OB_TX_CONTROL_VAR 6a26f141bf6200a Jacopo Mondi 2018-03-12 698 */ 7641b04421954ea Jacopo Mondi 2018-03-12 699 mt9t112_mcu_write(ret, client, VAR(27, 144), 0x0CB4); 7641b04421954ea Jacopo Mondi 2018-03-12 700 6a26f141bf6200a Jacopo Mondi 2018-03-12 701 /* 6a26f141bf6200a Jacopo Mondi 2018-03-12 702 * Enable JPEG in context B. 6a26f141bf6200a Jacopo Mondi 2018-03-12 703 * PRI_B_CONFIG_JPEG_OB_TX_CONTROL_VAR 6a26f141bf6200a Jacopo Mondi 2018-03-12 704 */ 7641b04421954ea Jacopo Mondi 2018-03-12 705 mt9t112_mcu_write(ret, client, VAR8(27, 142), 0x01); 7641b04421954ea Jacopo Mondi 2018-03-12 706 6a26f141bf6200a Jacopo Mondi 2018-03-12 707 /* Disable Dac_TXLO. */ 7641b04421954ea Jacopo Mondi 2018-03-12 708 mt9t112_reg_write(ret, client, 0x316C, 0x350F); 7641b04421954ea Jacopo Mondi 2018-03-12 709 6a26f141bf6200a Jacopo Mondi 2018-03-12 710 /* Set max slew rates. */ 7641b04421954ea Jacopo Mondi 2018-03-12 711 mt9t112_reg_write(ret, client, 0x1E, 0x777); 7641b04421954ea Jacopo Mondi 2018-03-12 712 7641b04421954ea Jacopo Mondi 2018-03-12 713 return ret; 7641b04421954ea Jacopo Mondi 2018-03-12 714 } 7641b04421954ea Jacopo Mondi 2018-03-12 715 :::::: The code at line 670 was first introduced by commit :::::: 7641b04421954ea092b8fa7edbf904c3852875b5 media: i2c: Copy mt9t112 soc_camera sensor driver :::::: TO: Jacopo Mondi <jacopo+renesas(a)jmondi.org&gt; :::::: CC: Mauro Carvalho Chehab <mchehab(a)s-opensource.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org