Hi Tony, I love your patch! Perhaps something to improve: [auto build test WARNING on kvms390/next] [also build test WARNING on linus/master v5.7] [cannot apply to s390/features linux/master next-20200605] [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/Tony-Krowiak/s390-vfio-ap-dynamic-configuration-support/20200606-054350 base: https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux.git next config: s390-allyesconfig (attached as .config) compiler: s390-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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=s390 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>, old ones prefixed by <<): >> drivers/s390/crypto/vfio_ap_ops.c:53:23: warning: no previous prototype for 'vfio_ap_get_mdev_queue' [-Wmissing-prototypes] 53 | struct vfio_ap_queue *vfio_ap_get_mdev_queue(struct ap_matrix_mdev *matrix_mdev, | ^~~~~~~~~~~~~~~~~~~~~~ drivers/s390/crypto/vfio_ap_ops.c:143:24: warning: no previous prototype for 'vfio_ap_irq_disable' [-Wmissing-prototypes] 143 | struct ap_queue_status vfio_ap_irq_disable(struct vfio_ap_queue *q) | ^~~~~~~~~~~~~~~~~~~ drivers/s390/crypto/vfio_ap_ops.c:1453:5: warning: no previous prototype for 'vfio_ap_mdev_reset_queue' [-Wmissing-prototypes] 1453 | int vfio_ap_mdev_reset_queue(unsigned int apid, unsigned int apqi, | ^~~~~~~~~~~~~~~~~~~~~~~~ vim +/vfio_ap_get_mdev_queue +53 drivers/s390/crypto/vfio_ap_ops.c 52 > 53 struct vfio_ap_queue *vfio_ap_get_mdev_queue(struct ap_matrix_mdev *matrix_mdev, 54 unsigned long apqn) 55 { 56 struct vfio_ap_queue *q; 57 58 hash_for_each_possible(matrix_mdev->qtable, q, mdev_qnode, apqn) { 59 if (q && (q->apqn == apqn)) 60 return q; 61 } 62 63 return NULL; 64 } 65 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org