tree:   https://github.com/linuxppc/linux next-test
head:   f46b75a9ae95df302fcb070678773574f6812216
commit: 6dcaaad9830c73908a23200ccc5da12583e04f1a [70/80] powerpc/vdso: Switch VDSO to generic C implementation.
config: powerpc64-randconfig-r005-20200826 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 7cfcecece0e0430937cf529ce74d3a071a4dedc6)
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 powerpc64 cross compiling tool for clang build
        # apt-get install binutils-powerpc64-linux-gnu
        git checkout 6dcaaad9830c73908a23200ccc5da12583e04f1a
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 

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

All warnings (new ones prefixed by >>):

>> /usr/bin/powerpc64-linux-gnu-ld: warning: discarding dynamic section .rela.opd

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