tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 7ddd09fc4b745fb1d8942f95389583e08412e0cd commit: 1a28157f60da8f60b9021ba0b2f1b1d47854a230 [5117/5337] lib/zlib: add zlib_deflate_dfltcc_enabled() function config: s390-randconfig-a001-20200103 (attached as .config) compiler: s390-linux-gcc (GCC) 7.5.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 1a28157f60da8f60b9021ba0b2f1b1d47854a230 # save the attached .config to linux build tree GCC_VERSION=7.5.0 make.cross ARCH=s390 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): lib/zlib_deflate/../zlib_dfltcc/dfltcc_util.h: Assembler messages: vim +114 lib/zlib_deflate/../zlib_dfltcc/dfltcc_util.h 09c70dfa9baf2e Mikhail Zaslonko 2019-12-18 102 09c70dfa9baf2e Mikhail Zaslonko 2019-12-18 103 static inline int is_dfltcc_enabled(void) 09c70dfa9baf2e Mikhail Zaslonko 2019-12-18 104 { 09c70dfa9baf2e Mikhail Zaslonko 2019-12-18 105 uint64_t facilities[(DFLTCC_FACILITY / 64) + 1]; 09c70dfa9baf2e Mikhail Zaslonko 2019-12-18 106 register char r0 __asm__("r0"); 09c70dfa9baf2e Mikhail Zaslonko 2019-12-18 107 7ac8eafa5b48ca Mikhail Zaslonko 2019-12-18 108 /* Check for kernel dfltcc command line parameter */ 7ac8eafa5b48ca Mikhail Zaslonko 2019-12-18 109 if (zlib_dfltcc_support == ZLIB_DFLTCC_DISABLED) 7ac8eafa5b48ca Mikhail Zaslonko 2019-12-18 110 return 0; 7ac8eafa5b48ca Mikhail Zaslonko 2019-12-18 111 09c70dfa9baf2e Mikhail Zaslonko 2019-12-18 112 memset(facilities, 0, sizeof(facilities)); 09c70dfa9baf2e Mikhail Zaslonko 2019-12-18 113 r0 = sizeof(facilities) / sizeof(facilities[0]) - 1; 09c70dfa9baf2e Mikhail Zaslonko 2019-12-18 @114 __asm__ volatile("stfle %[facilities]\n" 09c70dfa9baf2e Mikhail Zaslonko 2019-12-18 115 : [facilities] "=Q" (facilities) 09c70dfa9baf2e Mikhail Zaslonko 2019-12-18 116 , [r0] "+r" (r0) 09c70dfa9baf2e Mikhail Zaslonko 2019-12-18 117 : 09c70dfa9baf2e Mikhail Zaslonko 2019-12-18 118 : "cc"); 09c70dfa9baf2e Mikhail Zaslonko 2019-12-18 119 return is_bit_set((const char *)facilities, DFLTCC_FACILITY); 09c70dfa9baf2e Mikhail Zaslonko 2019-12-18 120 } 09c70dfa9baf2e Mikhail Zaslonko 2019-12-18 121 :::::: The code at line 114 was first introduced by commit :::::: 09c70dfa9baf2e77aa78293f6ea3ca3e53ea98db lib/zlib: add s390 hardware support for kernel zlib_deflate :::::: TO: Mikhail Zaslonko <zaslonko(a)linux.ibm.com&gt; :::::: CC: Stephen Rothwell <sfr(a)canb.auug.org.au&gt; --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation