tree:   https://git.linaro.org/people/vincent.guittot/kernel.git test/scheduler
head:   1e5360db16325edbc2b5afcd085644615a12b0a8
commit: 870213e345cbcfecdacc95c0d9e41fbd6e44070b [6/7] sched/fair: trigger the update of blocked load on newly idle cpu
config: arm-randconfig-r001-20210209 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476)
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
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        git remote add vincent.guittot https://git.linaro.org/people/vincent.guittot/kernel.git
        git fetch --no-tags vincent.guittot test/scheduler
        git checkout 870213e345cbcfecdacc95c0d9e41fbd6e44070b
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   ld.lld: warning: lld uses blx instruction, no object with architecture supporting feature detected
   ld.lld: warning: lld uses blx instruction, no object with architecture supporting feature detected
>> ld.lld: error: undefined symbol: nohz_run_idle_balance
   >>> referenced by idle.c
   >>>               sched/idle.o:(do_idle) in archive kernel/built-in.a

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