tree: https://android.googlesource.com/kernel/common android-4.19 head: a1728ecf5aed447128ca7143f29d8b0f5f6263c5 commit: 0854e59101a9219eb1607fb584dde8da4dea220e [69/106] UPSTREAM: lib/vdso: Build 32 bit specific functions in the right context config: mips-malta_kvm_defconfig (attached as .config) compiler: mipsel-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 0854e59101a9219eb1607fb584dde8da4dea220e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day GCC_VERSION=9.3.0 make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from lib/vdso/gettimeofday.c:26, from <command-line>: arch/mips/include/asm/vdso/gettimeofday.h: In function 'clock_gettime_fallback': arch/mips/include/asm/vdso/gettimeofday.h:59:31: error: '__NR_clock_gettime64' undeclared (first use in this function) 59 | register long nr asm("v0") = __NR_clock_gettime64; | ^~~~~~~~~~~~~~~~~~~~ arch/mips/include/asm/vdso/gettimeofday.h:59:31: note: each undeclared identifier is reported only once for each function it appears in arch/mips/include/asm/vdso/gettimeofday.h: In function 'clock_getres_fallback': arch/mips/include/asm/vdso/gettimeofday.h:83:31: error: '__NR_clock_getres_time64' undeclared (first use in this function) 83 | register long nr asm("v0") = __NR_clock_getres_time64; | ^~~~~~~~~~~~~~~~~~~~~~~~ arch/mips/vdso/vgettimeofday.c: In function '__vdso_clock_gettime': arch/mips/vdso/vgettimeofday.c:17:9: error: implicit declaration of function '__cvdso_clock_gettime32'; did you mean '__cvdso_clock_gettime'? [-Werror=implicit-function-declaration] 17 | return __cvdso_clock_gettime32(clock, ts); | ^~~~~~~~~~~~~~~~~~~~~~~ | __cvdso_clock_gettime arch/mips/vdso/vgettimeofday.c: In function '__vdso_clock_getres': 39 | return __cvdso_clock_getres_time32(clock_id, res); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ | __cvdso_clock_getres_common cc1: all warnings being treated as errors vim +39 arch/mips/vdso/vgettimeofday.c cf84512fe7aac9 Vincenzo Frascino 2019-11-29 35 23dea1cf7ed384 Vincenzo Frascino 2019-06-21 36 int __vdso_clock_getres(clockid_t clock_id, 23dea1cf7ed384 Vincenzo Frascino 2019-06-21 37 struct old_timespec32 *res) 23dea1cf7ed384 Vincenzo Frascino 2019-06-21 38 { 23dea1cf7ed384 Vincenzo Frascino 2019-06-21 @39 return __cvdso_clock_getres_time32(clock_id, res); 23dea1cf7ed384 Vincenzo Frascino 2019-06-21 40 } 23dea1cf7ed384 Vincenzo Frascino 2019-06-21 41 :::::: The code at line 39 was first introduced by commit :::::: 23dea1cf7ed3846719448e74feeb56c28e3a9019 UPSTREAM: mips: Add clock_getres entry point :::::: TO: Vincenzo Frascino <vincenzo.frascino(a)arm.com&gt; :::::: CC: Alistair Delva <adelva(a)google.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org