Hi Robert, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linus/master] [cannot apply to v5.3 next-20190915] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Robert-Baldyga/nvme-Add-kernel-API-for-admin-command/20190916-134358 config: sparc64-allmodconfig (attached as .config) compiler: sparc64-linux-gcc (GCC) 7.4.0 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=7.4.0 make.cross ARCH=sparc64 If you fix the issue, kindly add following tag Reported-by: kbuild test robot All warnings (new ones prefixed by >>): In file included from drivers/nvme/host/nvme.h:9:0, from drivers/nvme/host/fault_inject.c:9: >> include/linux/nvme.h:1395:42: warning: 'struct block_device' declared inside parameter list will not be visible outside of this definition or declaration int nvme_submit_admin_cmd_by_bdev(struct block_device *bdev, ^~~~~~~~~~~~ vim +1395 include/linux/nvme.h 1394 > 1395 int nvme_submit_admin_cmd_by_bdev(struct block_device *bdev, 1396 struct nvme_command *c, void *buffer, unsigned int bufflen); 1397 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation