tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   ff1176468d368232b684f75e82563369208bc371
commit: 7b034d9c1b08b3d06ad712283c1115a7fe39e354 s390/boot: add zstd support
date:   6 weeks ago
config: s390-randconfig-r026-20210727 (attached as .config)
compiler: s390-linux-gcc (GCC) 10.3.0
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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7b034d9c1b08b3d06ad712283c1115a7fe39e354
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 7b034d9c1b08b3d06ad712283c1115a7fe39e354
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=s390 SHELL=/bin/bash

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 >>):

   s390-linux-ld: arch/s390/boot/compressed/decompressor.o: in function `HUF_decompress1X2_usingDTable_internal':
>> decompressor.c:(.text+0x2152): undefined reference to `__clzdi2'
>> s390-linux-ld: decompressor.c:(.text+0x2392): undefined reference to `__clzdi2'
   s390-linux-ld: arch/s390/boot/compressed/decompressor.o: in function `HUF_decompress1X4_usingDTable_internal':
   decompressor.c:(.text+0x2d16): undefined reference to `__clzdi2'
   s390-linux-ld: decompressor.c:(.text+0x2db4): undefined reference to `__clzdi2'
   s390-linux-ld: arch/s390/boot/compressed/decompressor.o: in function `ZSTD_decodeSequenceLong':
   decompressor.c:(.text+0x32a2): undefined reference to `__clzdi2'
   s390-linux-ld: arch/s390/boot/compressed/decompressor.o:decompressor.c:(.text+0x450c): more undefined references to `__clzdi2' follow

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