-static int vm_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr,
- unsigned long pfn, pgprot_t pgprot)
-{
- int ret;
- /*
- * Technically, architectures with pte_special can avoid all these
- * restrictions (same for remap_pfn_range). However we would like
- * consistency in testing and feature parity among all, so we should
- * try to keep these invariants in place for everybody.
- */
- BUG_ON(!(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP)));
- BUG_ON((vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP)) ==
- (VM_PFNMAP|VM_MIXEDMAP));
- BUG_ON((vma->vm_flags & VM_PFNMAP) && is_cow_mapping(vma->vm_flags));
- BUG_ON((vma->vm_flags & VM_MIXEDMAP) && pfn_valid(pfn));
-
- if (addr < vma->vm_start || addr >= vma->vm_end)
- return -EFAULT;
-
- if (!pfn_modify_allowed(pfn, pgprot))
- return -EACCES;
-
- track_pfn_insert(vma, &pgprot, __pfn_to_pfn_t(pfn, PFN_DEV));
-
- ret = insert_pfn(vma, addr, __pfn_to_pfn_t(pfn, PFN_DEV), pgprot,
- false);
-
- return ret;
-}
-