Hi Jason, I love your patch! Yet something to improve: [auto build test ERROR on vhost/linux-next] [also build test ERROR on linus/master v5.7 next-20200529] [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/Jason-Wang/vDPA-doorbell-mapping/20200531-070834 base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next config: m68k-randconfig-r011-20200601 (attached as .config) compiler: m68k-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=m68k If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>, old ones prefixed by <<): drivers/vhost/vdpa.c: In function 'vhost_vdpa_fault': >> drivers/vhost/vdpa.c:754:22: error: implicit declaration of function 'pgprot_noncached' [-Werror=implicit-function-declaration] 754 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | ^~~~~~~~~~~~~~~~ >> drivers/vhost/vdpa.c:754:22: error: incompatible types when assigning to type 'pgprot_t' {aka 'struct <anonymous>'} from type 'int' cc1: some warnings being treated as errors vim +/pgprot_noncached +754 drivers/vhost/vdpa.c 742 743 static vm_fault_t vhost_vdpa_fault(struct vm_fault *vmf) 744 { 745 struct vhost_vdpa *v = vmf->vma->vm_file->private_data; 746 struct vdpa_device *vdpa = v->vdpa; 747 const struct vdpa_config_ops *ops = vdpa->config; 748 struct vdpa_notification_area notify; 749 struct vm_area_struct *vma = vmf->vma; 750 u16 index = vma->vm_pgoff; 751 752 notify = ops->get_vq_notification(vdpa, index); 753 > 754 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 755 if (remap_pfn_range(vma, vmf->address & PAGE_MASK, 756 notify.addr >> PAGE_SHIFT, PAGE_SIZE, 757 vma->vm_page_prot)) 758 return VM_FAULT_SIGBUS; 759 760 return VM_FAULT_NOPAGE; 761 } 762 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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