Hi Jason, I love your patch! Perhaps something to improve: [auto build test WARNING on vhost/linux-next] [also build test WARNING on linus/master v5.9-rc1 next-20200821] [cannot apply to linux/master] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Jason-Wang/vDPA-API-for-reporting-IOVA-range/20200821-173030 base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next config: arm-randconfig-r026-20200820 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project b587ca93be114d07ec3bf654add97d7872325281) 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 # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/vdpa/vdpa_sim/vdpa_sim.c:577:24: warning: no previous prototype for function 'vdpasim_get_iova_range' [-Wmissing-prototypes] struct vdpa_iova_range vdpasim_get_iova_range(struct vdpa_device *vdpa) ^ drivers/vdpa/vdpa_sim/vdpa_sim.c:577:1: note: declare 'static' if the function is not intended to be used outside of this translation unit struct vdpa_iova_range vdpasim_get_iova_range(struct vdpa_device *vdpa) ^ static drivers/vdpa/vdpa_sim/vdpa_sim.c:89:19: warning: unused function 'vdpasim16_to_cpu' [-Wunused-function] static inline u16 vdpasim16_to_cpu(struct vdpasim *vdpasim, __virtio16 val) ^ 2 warnings generated. # https://github.com/0day-ci/linux/commit/fba5ff6281e9d46144860bcc558068b5516e5e62 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Jason-Wang/vDPA-API-for-reporting-IOVA-range/20200821-173030 git checkout fba5ff6281e9d46144860bcc558068b5516e5e62 vim +/vdpasim_get_iova_range +577 drivers/vdpa/vdpa_sim/vdpa_sim.c 576 > 577 struct vdpa_iova_range vdpasim_get_iova_range(struct vdpa_device *vdpa) 578 { 579 struct vdpa_iova_range range = { 580 .first = 0ULL, 581 .last = ULLONG_MAX, 582 }; 583 584 return range; 585 } 586 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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