Hi Peter, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on kbuild/for-next] [also build test WARNING on tip/x86/core linus/master v5.6-rc5 next-20200312] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Peter-Zijlstra/objtool-vmlinux-o... base: https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git for-next config: m68k-allmodconfig (attached as .config) compiler: m68k-linux-gcc (GCC) 9.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=9.2.0 make.cross ARCH=m68k If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from drivers/net/dsa/lantiq_gswip.c:47: 55 | #define INSTR 0 | In file included from include/linux/err.h:5, from include/linux/clk.h:12, from drivers/net/dsa/lantiq_gswip.c:28: include/linux/compiler.h:146: note: this is the location of the previous definition 146 | #define INSTR(expr) ({ \ | vim +/INSTR +55 drivers/net/dsa/lantiq_pce.h 14fceff4771e51 Hauke Mehrtens 2018-09-09 53 14fceff4771e51 Hauke Mehrtens 2018-09-09 54 /* parser's microcode length type */ 14fceff4771e51 Hauke Mehrtens 2018-09-09 @55 #define INSTR 0 14fceff4771e51 Hauke Mehrtens 2018-09-09 56 #define IPV6 1 14fceff4771e51 Hauke Mehrtens 2018-09-09 57 #define LENACCU 2 14fceff4771e51 Hauke Mehrtens 2018-09-09 58 :::::: The code at line 55 was first introduced by commit :::::: 14fceff4771e51b23b4485b575cf9e5b3414b89b net: dsa: Add Lantiq / Intel DSA driver for vrx200 :::::: TO: Hauke Mehrtens <hauke(a)hauke-m.de&gt; :::::: CC: David S. Miller <davem(a)davemloft.net&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org