tree: https://github.com/intel/linux-intel-lts.git 4.19/android_s head: d47c20847da6957c8b15960571893193936c8c1e commit: 6b7f832e465d88fca5f3a07b85e664f962c88e0b [16636/25248] BACKPORT: mips: Add support for generic vDSO config: mips-randconfig-r016-20211028 (attached as .config) compiler: mipsel-linux-gcc (GCC) 11.2.0 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://github.com/intel/linux-intel-lts/commit/6b7f832e465d88fca5f3a07b8... git remote add intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-lts 4.19/android_s git checkout 6b7f832e465d88fca5f3a07b85e664f962c88e0b # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=mips SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Note: the intel-lts/4.19/android_s HEAD d47c20847da6957c8b15960571893193936c8c1e builds fine. It only hurts bisectability. 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': 68 | register long nr asm("v0") = __NR_clock_gettime64; | ^~~~~~~~~~~~~~~~~~~~ arch/mips/include/asm/vdso/gettimeofday.h:68:38: note: each undeclared identifier is reported only once for each function it appears in In file included from <command-line>: lib/vdso/gettimeofday.c: In function '__cvdso_clock_gettime32': lib/vdso/gettimeofday.c:113:20: error: invalid use of undefined type 'struct compat_timespec' 113 | res->tv_sec = ts.tv_sec; | ^~ lib/vdso/gettimeofday.c:114:20: error: invalid use of undefined type 'struct compat_timespec' 114 | res->tv_nsec = ts.tv_nsec; | ^~ arch/mips/vdso/vgettimeofday.c: At top level: arch/mips/vdso/vgettimeofday.c:14:5: warning: no previous prototype for '__vdso_clock_gettime' [-Wmissing-prototypes] 14 | int __vdso_clock_gettime(clockid_t clock, | ^~~~~~~~~~~~~~~~~~~~ arch/mips/vdso/vgettimeofday.c:20:5: warning: no previous prototype for '__vdso_gettimeofday' [-Wmissing-prototypes] 20 | int __vdso_gettimeofday(struct __kernel_old_timeval *tv, | ^~~~~~~~~~~~~~~~~~~ vim +/__NR_clock_gettime64 +68 arch/mips/include/asm/vdso/gettimeofday.h 57 58 static __always_inline long clock_gettime_fallback( 59 clockid_t _clkid, 60 struct __kernel_timespec *_ts) 61 { 62 register struct __kernel_timespec *ts asm("a1") = _ts; 63 register clockid_t clkid asm("a0") = _clkid; 64 register long ret asm("v0"); 65 #if _MIPS_SIM == _MIPS_SIM_ABI64 66 register long nr asm("v0") = __NR_clock_gettime; 67 #else 69 #endif 70 register long error asm("a3"); 71 72 asm volatile( 73 " syscall\n" 74 : "=r" (ret), "=r" (error) 75 : "r" (clkid), "r" (ts), "r" (nr) 76 : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", 77 "$14", "$15", "$24", "$25", "hi", "lo", "memory"); 78 79 return error ? -ret : ret; 80 } 81 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org