[kbuild-all] Re: [peterz-queue:sched/core 4/9] arch/x86/kernel/smpboot.c:2083: undefined reference to `__udivdi3'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/core head: 073d35d51f30267ccb43479be42d382f9b03fd9a commit: df24fd8a5838c3e24dc7a41b37c5812cce80dd43 [4/9] x86, sched: Prevent divisions by zero in frequency invariant accounting config: i386-randconfig-a011-20200515 (attached as .config) compiler: gcc-4.9 (Ubuntu 4.9.3-13ubuntu2) 4.9.3 reproduce: git checkout df24fd8a5838c3e24dc7a41b37c5812cce80dd43 # save the attached .config to linux build tree make ARCH=i386 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 >>, old ones prefixed by <<): ld: arch/x86/kernel/smpboot.o: in function `arch_scale_freq_tick': >> arch/x86/kernel/smpboot.c:2083: undefined reference to `__udivdi3' vim +2083 arch/x86/kernel/smpboot.c 2061 2062 void arch_scale_freq_tick(void) 2063 { 2064 u64 freq_scale = SCHED_CAPACITY_SCALE; 2065 u64 aperf, mperf; 2066 u64 acnt, mcnt; 2067 2068 if (!arch_scale_freq_invariant()) 2069 return; 2070 2071 rdmsrl(MSR_IA32_APERF, aperf); 2072 rdmsrl(MSR_IA32_MPERF, mperf); 2073 2074 acnt = aperf - this_cpu_read(arch_prev_aperf); 2075 mcnt = mperf - this_cpu_read(arch_prev_mperf); 2076 2077 this_cpu_write(arch_prev_aperf, aperf); 2078 this_cpu_write(arch_prev_mperf, mperf); 2079 2080 if (check_shl_overflow(acnt, 2*SCHED_CAPACITY_SHIFT, &acnt)) 2081 goto error; 2082 > 2083 if (check_mul_overflow(mcnt, arch_max_freq_ratio, &mcnt) || !mcnt)