gpu: drm: vgem: Change return type to vm_fault_t

Use new return type vm_fault_t for fault handler.
Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180416150232.GA26745@jordon-HP-15-Notebook-PC

drivers/gpu/drm/vgem/vgem_drv.c

@@ -61,13 +61,13 @@ static void vgem_gem_free_object(struct drm_gem_object *obj)
 	kfree(vgem_obj);
 }
 
-static int vgem_gem_fault(struct vm_fault *vmf)
+static vm_fault_t vgem_gem_fault(struct vm_fault *vmf)
 {
 	struct vm_area_struct *vma = vmf->vma;
 	struct drm_vgem_gem_object *obj = vma->vm_private_data;
 	/* We don't use vmf->pgoff since that has the fake offset */
 	unsigned long vaddr = vmf->address;
-	int ret;
+	vm_fault_t ret = VM_FAULT_SIGBUS;
 	loff_t num_pages;
 	pgoff_t page_offset;
 	page_offset = (vaddr - vma->vm_start) >> PAGE_SHIFT;
@@ -77,7 +77,6 @@ static int vgem_gem_fault(struct vm_fault *vmf)
 	if (page_offset > num_pages)
 		return VM_FAULT_SIGBUS;
 
-	ret = -ENOENT;
 	mutex_lock(&obj->pages_lock);
 	if (obj->pages) {
 		get_page(obj->pages[page_offset]);