Re: [PATCH 4/6] vhost_vdpa: support doorbell mapping via mmap

[kbuild test robot]

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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