The symbol hwa742_update_window_async() is exported, but there is no prototype defined for it. That's why gcc complains: drivers-video-fbdev-omap-hwa742.c:warning:no-previous-prototype-for-hwa742_update_window_async Add the prototype, but I wonder if we couldn't drop exporting the symbol instead. Since omapfb_update_window_async() is exported the same way, are there any users outside of the tree? Signed-off-by: Helge Deller <deller@xxxxxx> diff --git a/drivers/video/fbdev/omap/omapfb.h b/drivers/video/fbdev/omap/omapfb.h index d930152c289c..0c753ccbc1c0 100644 --- a/drivers/video/fbdev/omap/omapfb.h +++ b/drivers/video/fbdev/omap/omapfb.h @@ -229,5 +229,9 @@ extern int omapfb_update_window_async(struct fb_info *fbi, struct omapfb_update_window *win, void (*callback)(void *), void *callback_data); +extern int hwa742_update_window_async(struct fb_info *fbi, + struct omapfb_update_window *win, + void (*callback)(void *), + void *callback_data); #endif /* __OMAPFB_H */