Hi Gene, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 3cc2bd440f2171f093b3a8480a4b54d8c270ed38 commit: 1f4877218f7e2c2b914aeb69a8a0f47d59c74717 [3210/13205] iio: adc: mt6360: Add ADC driver for MT6360 config: arc-randconfig-r034-20201214 (attached as .config) compiler: arceb-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/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next 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: 41 | static inline u16 get_unaligned_be16(const void *p) | ^~~~~~~~~~~~~~~~~~ In file included from include/asm-generic/unaligned.h:26, 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/be_struct.h:7:19: note: previous definition of 'get_unaligned_be16' was here 7 | static inline u16 get_unaligned_be16(const void *p) | ^~~~~~~~~~~~~~~~~~ In file included from drivers/iio/adc/mt6360-adc.c:12: 46 | static inline u32 get_unaligned_be32(const void *p) | ^~~~~~~~~~~~~~~~~~ In file included from include/asm-generic/unaligned.h:26, 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/be_struct.h:12:19: note: previous definition of 'get_unaligned_be32' was here 12 | static 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:26, 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/be_struct.h:17:19: note: previous definition of 'get_unaligned_be64' was here 17 | static inline u64 get_unaligned_be64(const void *p) | ^~~~~~~~~~~~~~~~~~ In file included from drivers/iio/adc/mt6360-adc.c:12: 56 | static inline void put_unaligned_be16(u16 val, void *p) | ^~~~~~~~~~~~~~~~~~ In file included from include/asm-generic/unaligned.h:26, 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/be_struct.h:22:20: note: previous definition of 'put_unaligned_be16' was here 22 | static inline void put_unaligned_be16(u16 val, void *p) | ^~~~~~~~~~~~~~~~~~ In file included from drivers/iio/adc/mt6360-adc.c:12: 61 | static inline void put_unaligned_be32(u32 val, void *p) | ^~~~~~~~~~~~~~~~~~ In file included from include/asm-generic/unaligned.h:26, 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/be_struct.h:27:20: note: previous definition of 'put_unaligned_be32' was here 27 | static inline void put_unaligned_be32(u32 val, void *p) | ^~~~~~~~~~~~~~~~~~ In file included from drivers/iio/adc/mt6360-adc.c:12: 66 | static inline void put_unaligned_be64(u64 val, void *p) | ^~~~~~~~~~~~~~~~~~ In file included from include/asm-generic/unaligned.h:26, 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/be_struct.h:32:20: note: previous definition of 'put_unaligned_be64' was here 32 | static inline void put_unaligned_be64(u64 val, void *p) | ^~~~~~~~~~~~~~~~~~ vim +/get_unaligned_be16 +41 include/linux/unaligned/be_byteshift.h 064106a91be5e76 Harvey Harrison 2008-04-29 40 064106a91be5e76 Harvey Harrison 2008-04-29 @41 static inline u16 get_unaligned_be16(const void *p) 064106a91be5e76 Harvey Harrison 2008-04-29 42 { 19f747f7370fcf4 Bart Van Assche 2020-03-13 43 return __get_unaligned_be16(p); 064106a91be5e76 Harvey Harrison 2008-04-29 44 } 064106a91be5e76 Harvey Harrison 2008-04-29 45 064106a91be5e76 Harvey Harrison 2008-04-29 @46 static inline u32 get_unaligned_be32(const void *p) 064106a91be5e76 Harvey Harrison 2008-04-29 47 { 19f747f7370fcf4 Bart Van Assche 2020-03-13 48 return __get_unaligned_be32(p); 064106a91be5e76 Harvey Harrison 2008-04-29 49 } 064106a91be5e76 Harvey Harrison 2008-04-29 50 064106a91be5e76 Harvey Harrison 2008-04-29 @51 static inline u64 get_unaligned_be64(const void *p) 064106a91be5e76 Harvey Harrison 2008-04-29 52 { 19f747f7370fcf4 Bart Van Assche 2020-03-13 53 return __get_unaligned_be64(p); 064106a91be5e76 Harvey Harrison 2008-04-29 54 } 064106a91be5e76 Harvey Harrison 2008-04-29 55 064106a91be5e76 Harvey Harrison 2008-04-29 @56 static inline void put_unaligned_be16(u16 val, void *p) 064106a91be5e76 Harvey Harrison 2008-04-29 57 { 064106a91be5e76 Harvey Harrison 2008-04-29 58 __put_unaligned_be16(val, p); 064106a91be5e76 Harvey Harrison 2008-04-29 59 } 064106a91be5e76 Harvey Harrison 2008-04-29 60 064106a91be5e76 Harvey Harrison 2008-04-29 @61 static inline void put_unaligned_be32(u32 val, void *p) 064106a91be5e76 Harvey Harrison 2008-04-29 62 { 064106a91be5e76 Harvey Harrison 2008-04-29 63 __put_unaligned_be32(val, p); 064106a91be5e76 Harvey Harrison 2008-04-29 64 } 064106a91be5e76 Harvey Harrison 2008-04-29 65 064106a91be5e76 Harvey Harrison 2008-04-29 @66 static inline void put_unaligned_be64(u64 val, void *p) 064106a91be5e76 Harvey Harrison 2008-04-29 67 { 064106a91be5e76 Harvey Harrison 2008-04-29 68 __put_unaligned_be64(val, p); 064106a91be5e76 Harvey Harrison 2008-04-29 69 } 064106a91be5e76 Harvey Harrison 2008-04-29 70 :::::: The code at line 41 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