Hi Gene, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 291009f656e8eaebbdfd3a8d99f6b190a9ce9deb commit: 1f4877218f7e2c2b914aeb69a8a0f47d59c74717 iio: adc: mt6360: Add ADC driver for MT6360 date: 3 months ago config: arc-randconfig-r024-20210209 (attached as .config) compiler: arc-elf-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://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 1f4877218f7e2c2b914aeb69a8a0f47d59c74717 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from drivers/iio/adc/mt6360-adc.c:12: include/linux/unaligned/be_byteshift.h:41:19: error: redefinition of 'get_unaligned_be16' 41 | static inline u16 get_unaligned_be16(const void *p) | ^~~~~~~~~~~~~~~~~~ In file included from include/asm-generic/unaligned.h:13, from arch/arc/include/asm/unaligned.h:11, from arch/arc/include/asm/io.h:12, from include/linux/io.h:13, from include/linux/irq.h:20, from drivers/iio/adc/mt6360-adc.c:5: include/linux/unaligned/access_ok.h:23:28: note: previous definition of 'get_unaligned_be16' was here 23 | static __always_inline u16 get_unaligned_be16(const void *p) | ^~~~~~~~~~~~~~~~~~ In file included from drivers/iio/adc/mt6360-adc.c:12: include/linux/unaligned/be_byteshift.h:46:19: error: redefinition of 'get_unaligned_be32' 46 | static inline u32 get_unaligned_be32(const void *p) | ^~~~~~~~~~~~~~~~~~ In file included from include/asm-generic/unaligned.h:13, from arch/arc/include/asm/unaligned.h:11, from arch/arc/include/asm/io.h:12, from include/linux/io.h:13, from include/linux/irq.h:20, from drivers/iio/adc/mt6360-adc.c:5: include/linux/unaligned/access_ok.h:28:28: note: previous definition of 'get_unaligned_be32' was here 28 | static __always_inline u32 get_unaligned_be32(const void *p) | ^~~~~~~~~~~~~~~~~~ In file included from drivers/iio/adc/mt6360-adc.c:12: 51 | static inline u64 get_unaligned_be64(const void *p) | ^~~~~~~~~~~~~~~~~~ In file included from include/asm-generic/unaligned.h:13, from arch/arc/include/asm/unaligned.h:11, from arch/arc/include/asm/io.h:12, from include/linux/io.h:13, from include/linux/irq.h:20, from drivers/iio/adc/mt6360-adc.c:5: include/linux/unaligned/access_ok.h:33:28: note: previous definition of 'get_unaligned_be64' was here 33 | static __always_inline u64 get_unaligned_be64(const void *p) | ^~~~~~~~~~~~~~~~~~ In file included from drivers/iio/adc/mt6360-adc.c:12: include/linux/unaligned/be_byteshift.h:56:20: error: redefinition of 'put_unaligned_be16' 56 | static inline void put_unaligned_be16(u16 val, void *p) | ^~~~~~~~~~~~~~~~~~ In file included from include/asm-generic/unaligned.h:13, from arch/arc/include/asm/unaligned.h:11, from arch/arc/include/asm/io.h:12, from include/linux/io.h:13, from include/linux/irq.h:20, from drivers/iio/adc/mt6360-adc.c:5: include/linux/unaligned/access_ok.h:53:29: note: previous definition of 'put_unaligned_be16' was here 53 | static __always_inline void put_unaligned_be16(u16 val, void *p) | ^~~~~~~~~~~~~~~~~~ In file included from drivers/iio/adc/mt6360-adc.c:12: include/linux/unaligned/be_byteshift.h:61:20: error: redefinition of 'put_unaligned_be32' 61 | static inline void put_unaligned_be32(u32 val, void *p) | ^~~~~~~~~~~~~~~~~~ In file included from include/asm-generic/unaligned.h:13, from arch/arc/include/asm/unaligned.h:11, from arch/arc/include/asm/io.h:12, from include/linux/io.h:13, from include/linux/irq.h:20, from drivers/iio/adc/mt6360-adc.c:5: include/linux/unaligned/access_ok.h:58:29: note: previous definition of 'put_unaligned_be32' was here 58 | static __always_inline void put_unaligned_be32(u32 val, void *p) | ^~~~~~~~~~~~~~~~~~ In file included from drivers/iio/adc/mt6360-adc.c:12: include/linux/unaligned/be_byteshift.h:66:20: error: redefinition of 'put_unaligned_be64' 66 | static inline void put_unaligned_be64(u64 val, void *p) | ^~~~~~~~~~~~~~~~~~ In file included from include/asm-generic/unaligned.h:13, from arch/arc/include/asm/unaligned.h:11, from arch/arc/include/asm/io.h:12, from include/linux/io.h:13, from include/linux/irq.h:20, from drivers/iio/adc/mt6360-adc.c:5: include/linux/unaligned/access_ok.h:63:29: note: previous definition of 'put_unaligned_be64' was here 63 | static __always_inline void put_unaligned_be64(u64 val, void *p) | ^~~~~~~~~~~~~~~~~~ vim +/get_unaligned_be64 +51 include/linux/unaligned/be_byteshift.h 064106a91be5e7 Harvey Harrison 2008-04-29 50 064106a91be5e7 Harvey Harrison 2008-04-29 @51 static inline u64 get_unaligned_be64(const void *p) 064106a91be5e7 Harvey Harrison 2008-04-29 52 { 19f747f7370fcf Bart Van Assche 2020-03-13 53 return __get_unaligned_be64(p); 064106a91be5e7 Harvey Harrison 2008-04-29 54 } 064106a91be5e7 Harvey Harrison 2008-04-29 55 :::::: The code at line 51 was first introduced by commit :::::: 064106a91be5e76cb42c1ddf5d3871e3a1bd2a23 kernel: add common infrastructure for unaligned access :::::: TO: Harvey Harrison <harvey.harrison(a)gmail.com&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org