[kbuild-all] decompress.c:undefined reference to `ftrace_likely_update'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 84196390620ac0e5070ae36af84c137c6216a7dc commit: baec970aa5ba11099ad7a91773350c91fb2113f0 mips: Add N64 machine type date: 9 weeks ago config: mips-randconfig-r014-20210323 (attached as .config) compiler: mips-linux-gcc (GCC) 9.3.0 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... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout baec970aa5ba11099ad7a91773350c91fb2113f0 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>): arch/mips/boot/compressed/decompress.c:38:6: warning: no previous prototype for 'error' [-Wmissing-prototypes] 38 | void error(char *x) | ^~~~~ In file included from arch/mips/boot/compressed/../../../../lib/decompress_unlz4.c:10, from arch/mips/boot/compressed/decompress.c:60: 484 | int LZ4_decompress_safe_withPrefix64k(const char *source, char *dest, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 506 | int LZ4_decompress_safe_forceExtDict(const char *source, char *dest, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/mips/boot/compressed/decompress.c:81:6: warning: no previous prototype for '__stack_chk_fail' [-Wmissing-prototypes] 81 | void __stack_chk_fail(void) | ^~~~~~~~~~~~~~~~ arch/mips/boot/compressed/decompress.c:86:6: warning: no previous prototype for 'decompress_kernel' [-Wmissing-prototypes] 86 | void decompress_kernel(unsigned long boot_heap_start) | ^~~~~~~~~~~~~~~~~ -- mips-linux-ld: arch/mips/boot/compressed/decompress.o: in function `LZ4_decompress_safe_withSmallPrefix': mips-linux-ld: decompress.c:(.text+0x184): undefined reference to `ftrace_likely_update' mips-linux-ld: decompress.c:(.text+0x23c): undefined reference to `ftrace_likely_update' mips-linux-ld: decompress.c:(.text+0x270): undefined reference to `ftrace_likely_update' mips-linux-ld: arch/mips/boot/compressed/decompress.o:decompress.c:(.text+0x294): more undefined references to `ftrace_likely_update' follow --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org