Hi K, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on staging/staging-testing] url: https://github.com/0day-ci/linux/commits/B-K-Karthik/drivers-staging-media-atomisp-pci-css_2401_system-host-csi_rx-c-fixed-a-sparse-warning-by-making-undeclared-symbols-static/20200714-212512 base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git caaba08f8c0dbe5c8fcb497faa7e3b394c21ff39 config: x86_64-allyesconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 02946de3802d3bc65bc9f2eb9b8d4969b5a7add8) 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 # 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@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/staging/media/atomisp/pci/css_2401_system/host/csi_rx.c:18:18: warning: unused variable 'N_SHORT_PACKET_LUT_ENTRIES' [-Wunused-const-variable] static const u32 N_SHORT_PACKET_LUT_ENTRIES[N_CSI_RX_BACKEND_ID] = { ^ >> drivers/staging/media/atomisp/pci/css_2401_system/host/csi_rx.c:24:18: warning: unused variable 'N_LONG_PACKET_LUT_ENTRIES' [-Wunused-const-variable] static const u32 N_LONG_PACKET_LUT_ENTRIES[N_CSI_RX_BACKEND_ID] = { ^ >> drivers/staging/media/atomisp/pci/css_2401_system/host/csi_rx.c:30:18: warning: unused variable 'N_CSI_RX_FE_CTRL_DLANES' [-Wunused-const-variable] static const u32 N_CSI_RX_FE_CTRL_DLANES[N_CSI_RX_FRONTEND_ID] = { ^ >> drivers/staging/media/atomisp/pci/css_2401_system/host/csi_rx.c:37:18: warning: unused variable 'N_CSI_RX_BE_SID_WIDTH' [-Wunused-const-variable] static const u32 N_CSI_RX_BE_SID_WIDTH[N_CSI_RX_BACKEND_ID] = { ^ 4 warnings generated. vim +/N_SHORT_PACKET_LUT_ENTRIES +18 drivers/staging/media/atomisp/pci/css_2401_system/host/csi_rx.c 17 > 18 static const u32 N_SHORT_PACKET_LUT_ENTRIES[N_CSI_RX_BACKEND_ID] = { 19 4, /* 4 entries at CSI_RX_BACKEND0_ID*/ 20 4, /* 4 entries at CSI_RX_BACKEND1_ID*/ 21 4 /* 4 entries at CSI_RX_BACKEND2_ID*/ 22 }; 23 > 24 static const u32 N_LONG_PACKET_LUT_ENTRIES[N_CSI_RX_BACKEND_ID] = { 25 8, /* 8 entries at CSI_RX_BACKEND0_ID*/ 26 4, /* 4 entries at CSI_RX_BACKEND1_ID*/ 27 4 /* 4 entries at CSI_RX_BACKEND2_ID*/ 28 }; 29 > 30 static const u32 N_CSI_RX_FE_CTRL_DLANES[N_CSI_RX_FRONTEND_ID] = { 31 N_CSI_RX_DLANE_ID, /* 4 dlanes for CSI_RX_FR0NTEND0_ID */ 32 N_CSI_RX_DLANE_ID, /* 4 dlanes for CSI_RX_FR0NTEND1_ID */ 33 N_CSI_RX_DLANE_ID /* 4 dlanes for CSI_RX_FR0NTEND2_ID */ 34 }; 35 36 /* sid_width for CSI_RX_BACKEND<N>_ID */ > 37 static const u32 N_CSI_RX_BE_SID_WIDTH[N_CSI_RX_BACKEND_ID] = { --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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