tree: https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git arm-kill-set_fs-4 head: 1d3fb77b2dd5e198884e0ebf81087989dfd6eff8 commit: c28f2a3405e27b1b4c6614526418b0b7ac102ee8 [15/37] move compat_u64 definition config: arm64-randconfig-p002-20200917 (attached as .config) compiler: aarch64-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 git checkout c28f2a3405e27b1b4c6614526418b0b7ac102ee8 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 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 include/linux/stat.h:6, from include/linux/sysfs.h:22, from include/linux/kobject.h:20, from include/linux/of.h:17, from include/linux/irqdomain.h:35, from include/linux/acpi.h:13, from include/acpi/apei.h:9, from include/acpi/ghes.h:5, from include/linux/arm_sdei.h:8, from arch/arm64/kernel/asm-offsets.c:10: 20 | compat_u64 st_dev; | ^~~~~~~~~~ arch/arm64/include/asm/stat.h:31:2: error: unknown type name 'compat_u64' 31 | compat_u64 st_rdev; | ^~~~~~~~~~ 34 | compat_s64 st_size; | ^~~~~~~~~~ arch/arm64/include/asm/stat.h:36:2: error: unknown type name 'compat_u64' 36 | compat_u64 st_blocks; /* Number of 512-byte blocks allocated. */ | ^~~~~~~~~~ arch/arm64/include/asm/stat.h:47:2: error: unknown type name 'compat_u64' 47 | compat_u64 st_ino; | ^~~~~~~~~~ make[2]: *** [scripts/Makefile.build:117: arch/arm64/kernel/asm-offsets.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1203: prepare0] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:185: __sub-make] Error 2 make: Target 'prepare' not remade because of errors. # https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git/commi... git remote add arnd-playground https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git git fetch --no-tags arnd-playground arm-kill-set_fs-4 git checkout c28f2a3405e27b1b4c6614526418b0b7ac102ee8 vim +/compat_u64 +20 arch/arm64/include/asm/stat.h 7992d60dc46576b Catalin Marinas 2012-03-05 14 7992d60dc46576b Catalin Marinas 2012-03-05 15 /* 7992d60dc46576b Catalin Marinas 2012-03-05 16 * struct stat64 is needed for compat tasks only. Its definition is different 7992d60dc46576b Catalin Marinas 2012-03-05 17 * from the generic struct stat64. 7992d60dc46576b Catalin Marinas 2012-03-05 18 */ 7992d60dc46576b Catalin Marinas 2012-03-05 19 struct stat64 { 7992d60dc46576b Catalin Marinas 2012-03-05 @20 compat_u64 st_dev; 7992d60dc46576b Catalin Marinas 2012-03-05 21 unsigned char __pad0[4]; 7992d60dc46576b Catalin Marinas 2012-03-05 22 7992d60dc46576b Catalin Marinas 2012-03-05 23 #define STAT64_HAS_BROKEN_ST_INO 1 7992d60dc46576b Catalin Marinas 2012-03-05 24 compat_ulong_t __st_ino; 7992d60dc46576b Catalin Marinas 2012-03-05 25 compat_uint_t st_mode; 7992d60dc46576b Catalin Marinas 2012-03-05 26 compat_uint_t st_nlink; 7992d60dc46576b Catalin Marinas 2012-03-05 27 7992d60dc46576b Catalin Marinas 2012-03-05 28 compat_ulong_t st_uid; 7992d60dc46576b Catalin Marinas 2012-03-05 29 compat_ulong_t st_gid; 7992d60dc46576b Catalin Marinas 2012-03-05 30 7992d60dc46576b Catalin Marinas 2012-03-05 31 compat_u64 st_rdev; 7992d60dc46576b Catalin Marinas 2012-03-05 32 unsigned char __pad3[4]; 7992d60dc46576b Catalin Marinas 2012-03-05 33 7992d60dc46576b Catalin Marinas 2012-03-05 @34 compat_s64 st_size; 7992d60dc46576b Catalin Marinas 2012-03-05 35 compat_ulong_t st_blksize; 7992d60dc46576b Catalin Marinas 2012-03-05 36 compat_u64 st_blocks; /* Number of 512-byte blocks allocated. */ 7992d60dc46576b Catalin Marinas 2012-03-05 37 7992d60dc46576b Catalin Marinas 2012-03-05 38 compat_ulong_t st_atime; 7992d60dc46576b Catalin Marinas 2012-03-05 39 compat_ulong_t st_atime_nsec; 7992d60dc46576b Catalin Marinas 2012-03-05 40 7992d60dc46576b Catalin Marinas 2012-03-05 41 compat_ulong_t st_mtime; 7992d60dc46576b Catalin Marinas 2012-03-05 42 compat_ulong_t st_mtime_nsec; 7992d60dc46576b Catalin Marinas 2012-03-05 43 7992d60dc46576b Catalin Marinas 2012-03-05 44 compat_ulong_t st_ctime; 7992d60dc46576b Catalin Marinas 2012-03-05 45 compat_ulong_t st_ctime_nsec; 7992d60dc46576b Catalin Marinas 2012-03-05 46 7992d60dc46576b Catalin Marinas 2012-03-05 47 compat_u64 st_ino; 7992d60dc46576b Catalin Marinas 2012-03-05 48 }; 7992d60dc46576b Catalin Marinas 2012-03-05 49 :::::: The code at line 20 was first introduced by commit :::::: 7992d60dc46576bc6f6429d87f313462141db6d2 arm64: System calls handling :::::: TO: Catalin Marinas <catalin.marinas(a)arm.com&gt; :::::: CC: Catalin Marinas <catalin.marinas(a)arm.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org