Hi Jonathan, I love your patch! Yet something to improve: [auto build test ERROR on efi/next] [cannot apply to v5.4-rc7 next-20191112] [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/Jonathan-Cameron/efi-ras-CCIX-Me... base: https://git.kernel.org/pub/scm/linux/kernel/git/efi/efi.git next config: i386-defconfig (attached as .config) compiler: gcc-7 (Debian 7.4.0-14) 7.4.0 reproduce: # save the attached .config to linux build tree make ARCH=i386 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 >>): ld: drivers/ras/ras.o: in function `perf_trace_ccix_memory_error_event': ld: drivers/ras/ras.o: in function `trace_raw_output_ccix_memory_error_event': ld: drivers/ras/ras.o: in function `trace_event_raw_event_ccix_memory_error_event': ras.c:(.text+0x10e9): undefined reference to `cper_ccix_mem_err_pack' --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation