Hi Ng, First bad commit (maybe != root cause): tree: https://github.com/intel/linux-intel-lts.git 5.10/yocto head: cb7e61a3cffb19413bc9d8ad7e0b690eec519348 commit: 2def42a616c1ceec2eb739c6befb6af42f6ee22c [9825/9862] Fix compile issue config: sh-allmodconfig (attached as .config) compiler: sh4-linux-gcc (GCC) 9.3.0 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 # https://github.com/intel/linux-intel-lts/commit/2def42a616c1ceec2eb739c6b... git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-linux-intel-lts 5.10/yocto git checkout 2def42a616c1ceec2eb739c6befb6af42f6ee22c # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sh 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/media/i2c/ar0234.c: In function 'ar0234_start_streaming': drivers/media/i2c/ar0234.c:1757:6: warning: unused variable 'val' [-Wunused-variable] 1757 | u32 val; | ^~~ drivers/media/i2c/ar0234.c: At top level: 2102 | irqreturn_t ar0234_threaded_irq_fn(int irq, void *dev_id) | ^~~~~~~~~~~~~~~~~~~~~~ -- drivers/media/i2c/imx390.c: In function 'get_hblank': drivers/media/i2c/imx390.c:422:6: warning: unused variable 'pixel_clk' [-Wunused-variable] 422 | u64 pixel_clk; | ^~~~~~~~~ drivers/media/i2c/imx390.c:421:6: warning: unused variable 'pixel_rate' [-Wunused-variable] 421 | u64 pixel_rate; | ^~~~~~~~~~ drivers/media/i2c/imx390.c: In function 'imx390_exposure_raw_set': 439 | struct imx390_reg exposure_array[] = { | ^~~~~~ drivers/media/i2c/imx390.c:429:6: warning: unused variable 'err' [-Wunused-variable] 429 | int err = 0; | ^~~ drivers/media/i2c/imx390.c: In function 'imx390_set_ctrl': drivers/media/i2c/imx390.c:502:6: warning: unused variable 'val' [-Wunused-variable] 502 | u32 val; | ^~~ drivers/media/i2c/imx390.c:500:6: warning: unused variable 'exposure_max' [-Wunused-variable] 500 | s64 exposure_max; | ^~~~~~~~~~~~ drivers/media/i2c/imx390.c: In function 'imx390_init_controls': drivers/media/i2c/imx390.c:542:26: warning: unused variable 'cfg' [-Wunused-variable] 542 | struct v4l2_ctrl_config cfg = { 0 }; | ^~~ drivers/media/i2c/imx390.c:540:6: warning: unused variable 'exposure_max' [-Wunused-variable] 540 | s64 exposure_max; | ^~~~~~~~~~~~ drivers/media/i2c/imx390.c:538:21: warning: unused variable 'client' [-Wunused-variable] 538 | struct i2c_client *client = v4l2_get_subdevdata(&imx390->sd); | ^~~~~~ drivers/media/i2c/imx390.c: At top level: 941 | irqreturn_t imx390_threaded_irq_fn(int irq, void *dev_id) | ^~~~~~~~~~~~~~~~~~~~~~ drivers/media/i2c/imx390.c:402:12: warning: 'imx390_update_digital_gain' defined but not used [-Wunused-function] 402 | static int imx390_update_digital_gain(struct imx390 *imx390, u32 d_gain) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/media/i2c/imx390.c:340:12: warning: 'imx390_gain_raw_set' defined but not used [-Wunused-function] 340 | static int imx390_gain_raw_set(struct imx390 *self, u16 gain) | ^~~~~~~~~~~~~~~~~~~ drivers/media/i2c/imx390.c: In function 'get_pixel_rate': drivers/media/i2c/imx390.c:411:9: warning: 'pixel_rate' is used uninitialized in this function [-Wuninitialized] 411 | return pixel_rate; | ^~~~~~~~~~ drivers/media/i2c/imx390.c: In function 'get_hblank': drivers/media/i2c/imx390.c:424:9: warning: 'hblank' is used uninitialized in this function [-Wuninitialized] 424 | return hblank; | ^~~~~~ Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for SND_ATMEL_SOC_PDC Depends on SOUND && !UML && SND && SND_SOC && SND_ATMEL_SOC && HAS_DMA Selected by - SND_ATMEL_SOC_SSC && SOUND && !UML && SND && SND_SOC && SND_ATMEL_SOC - SND_ATMEL_SOC_SSC_PDC && SOUND && !UML && SND && SND_SOC && SND_ATMEL_SOC && ATMEL_SSC vim +/ar0234_threaded_irq_fn +2102 drivers/media/i2c/ar0234.c 1aafb1e0df5527 Ng Khai Wen 2021-07-01 2101 1aafb1e0df5527 Ng Khai Wen 2021-07-01 @2102 irqreturn_t ar0234_threaded_irq_fn(int irq, void *dev_id) 1aafb1e0df5527 Ng Khai Wen 2021-07-01 2103 { 1aafb1e0df5527 Ng Khai Wen 2021-07-01 2104 return IRQ_HANDLED; 1aafb1e0df5527 Ng Khai Wen 2021-07-01 2105 } 1aafb1e0df5527 Ng Khai Wen 2021-07-01 2106 :::::: The code at line 2102 was first introduced by commit :::::: 1aafb1e0df5527884ad5ccb67ec95414df4d85f7 Add IPU driver :::::: TO: Ng Khai Wen <khai.wen.ng(a)intel.com&gt; :::::: CC: Pan, Kris <kris.pan(a)intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org