[kbuild-all] arch/ia64/kernel/elfcore.c:22: undefined reference to `dump_emit'

Hi Arnd, It's probably a bug fix that unveils the link errors. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: a581387e415bbb0085e7e67906c8f4a99746590e commit: ec3e5c0f0c2b716e768c0eee0fec30d572939ef5 drm/amdgpu: make pmu support optional, again date: 9 months ago config: ia64-randconfig-r025-20200710 (attached as .config) compiler: ia64-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 git checkout ec3e5c0f0c2b716e768c0eee0fec30d572939ef5 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=ia64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): ia64-linux-ld: arch/ia64/kernel/elfcore.o: in function `elf_core_write_extra_phdrs': ia64-linux-ld: arch/ia64/kernel/elfcore.o: in function `elf_core_write_extra_data': arch/ia64/kernel/elfcore.c:55: undefined reference to `dump_emit' vim +22 arch/ia64/kernel/elfcore.c 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 14 506f21c556c747 Al Viro 2013-10-05 15 int elf_core_write_extra_phdrs(struct coredump_params *cprm, loff_t offset) 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 16 { 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 17 const struct elf_phdr *const gate_phdrs = 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 18 (const struct elf_phdr *) (GATE_ADDR + GATE_EHDR->e_phoff); 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 19 int i; 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 20 Elf64_Off ofs = 0; 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 21 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 @22 for (i = 0; i < GATE_EHDR->e_phnum; ++i) { 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 23 struct elf_phdr phdr = gate_phdrs[i]; 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 24 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 25 if (phdr.p_type == PT_LOAD) { 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 26 phdr.p_memsz = PAGE_ALIGN(phdr.p_memsz); 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 27 phdr.p_filesz = phdr.p_memsz; 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 28 if (ofs == 0) { 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 29 ofs = phdr.p_offset = offset; 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 30 offset += phdr.p_filesz; 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 31 } else { 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 32 phdr.p_offset = ofs; 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 33 } 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 34 } else { 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 35 phdr.p_offset += ofs; 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 36 } 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 37 phdr.p_paddr = 0; /* match other core phdrs */ 506f21c556c747 Al Viro 2013-10-05 38 if (!dump_emit(cprm, &phdr, sizeof(phdr))) 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 39 return 0; 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 40 } 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 41 return 1; 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 42 } 1fcccbac89f5bb Daisuke HATAYAMA 2010-03-05 43 :::::: The code at line 22 was first introduced by commit :::::: 1fcccbac89f5bbc5e41aa72086960059fce372da elf coredump: replace ELF_CORE_EXTRA_* macros by functions :::::: TO: Daisuke HATAYAMA <d.hatayama(a)jp.fujitsu.com&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org