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@intel.com>

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)

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org