diff --git a/mm/mremap.c b/mm/mremap.c
index c0a67ee..9abb8f3 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -416,8 +416,8 @@ static struct vm_area_struct *vma_to_resize(unsigned long addr,
 		return ERR_PTR(-EINVAL);
 	}
 
-	if (flags & MREMAP_DONTUNMAP && (!vma_is_anonymous(vma) ||
-			vma->vm_flags & VM_SHARED))
+	if ((flags & MREMAP_DONTUNMAP) &&
+			(vma->vm_flags & (VM_DONTEXPAND | VM_PFNMAP)))
 		return ERR_PTR(-EINVAL);
 
 	if (is_vm_hugetlb_page(vma))