drivers/vfio/pci/nvgrace-gpu/main.c:167:9: sparse: sparse: cast from restricted vm_fault_t

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   848acc8ffe1b7cd5f1bf427b93069becfebc2c9d
commit: 9db65489b87298f20baef683e70143c108959793 vfio/nvgrace-gpu: Add support for huge pfnmap
date:   8 months ago
config: alpha-randconfig-r123-20260804 (https://download.01.org/0day-ci/archive/20260804/[email protected]/config)
compiler: alpha-linux-gcc (GCC) 8.5.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260804/[email protected]/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Fixes: 9db65489b872 ("vfio/nvgrace-gpu: Add support for huge pfnmap")
| Reported-by: kernel test robot <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

sparse warnings: (new ones prefixed by >>)
>> drivers/vfio/pci/nvgrace-gpu/main.c:167:9: sparse: sparse: cast from restricted vm_fault_t

vim +167 drivers/vfio/pci/nvgrace-gpu/main.c

   142	
   143	static vm_fault_t nvgrace_gpu_vfio_pci_huge_fault(struct vm_fault *vmf,
   144							  unsigned int order)
   145	{
   146		struct vm_area_struct *vma = vmf->vma;
   147		struct nvgrace_gpu_pci_core_device *nvdev = vma->vm_private_data;
   148		struct vfio_pci_core_device *vdev = &nvdev->core_device;
   149		unsigned int index =
   150			vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
   151		vm_fault_t ret = VM_FAULT_FALLBACK;
   152		struct mem_region *memregion;
   153		unsigned long pfn, addr;
   154	
   155		memregion = nvgrace_gpu_memregion(index, nvdev);
   156		if (!memregion)
   157			return VM_FAULT_SIGBUS;
   158	
   159		addr = ALIGN_DOWN(vmf->address, PAGE_SIZE << order);
   160		pfn = PHYS_PFN(memregion->memphys) + addr_to_pgoff(vma, addr);
   161	
   162		if (is_aligned_for_order(vma, addr, pfn, order)) {
   163			scoped_guard(rwsem_read, &vdev->memory_lock)
   164				ret = vfio_pci_vmf_insert_pfn(vdev, vmf, pfn, order);
   165		}
   166	
 > 167		dev_dbg_ratelimited(&vdev->pdev->dev,
   168				    "%s order = %d pfn 0x%lx: 0x%x\n",
   169				    __func__, order, pfn,
   170				    (unsigned int)ret);
   171	
   172		return ret;
   173	}
   174	

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