[RFC PATCH] drm/xen-front: display_mode_valid() can be static

[kbuild test robot]

Fixes: d7f404c8b4b6 ("drm/xen-front: Add support for Xen PV display frontend")
Signed-off-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
---
 xen_drm_front_kms.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xen/xen_drm_front_kms.c b/drivers/gpu/drm/xen/xen_drm_front_kms.c
index 545049d..bd676be 100644
--- a/drivers/gpu/drm/xen/xen_drm_front_kms.c
+++ b/drivers/gpu/drm/xen/xen_drm_front_kms.c
@@ -273,7 +273,7 @@ static void display_update(struct drm_simple_display_pipe *pipe,
 	drm_dev_exit(idx);
 }
 
-enum drm_mode_status display_mode_valid(struct drm_crtc *crtc,
+static enum drm_mode_status display_mode_valid(struct drm_crtc *crtc,
 		const struct drm_display_mode *mode)
 {
 	struct xen_drm_front_drm_pipeline *pipeline =