Hi Avri, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on scsi/for-next] [also build test ERROR on next-20200515] [cannot apply to mkp-scsi/for-next v5.7-rc5] [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/Avri-Altman/scsi-ufs-Add-HPB-Sup... base: https://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi.git for-next config: sh-allmodconfig (attached as .config) compiler: sh4-linux-gcc (GCC) 9.3.0 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 COMPILER_INSTALL_PATH=$HOME/0day GCC_VERSION=9.3.0 make.cross ARCH=sh If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>, old ones prefixed by <<): sh4-linux-ld: drivers/scsi/device_handler/scsi_dh_ufshpb.o: in function `ufshpb_attach': scsi_dh_ufshpb.c:(.text+0xb4): undefined reference to `sdev_prefix_printk' sh4-linux-ld: drivers/scsi/device_handler/scsi_dh_ufshpb.o: in function `ufshpb_exit': sh4-linux-ld: drivers/scsi/device_handler/scsi_dh_ufshpb.o: in function `ufshpb_init': scsi_dh_ufshpb.c:(.init.text+0x28): undefined reference to `scsi_register_device_handler' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org