static void flush_scrollback(struct vc_data *vc)
{
	WARN_CONSOLE_UNLOCKED();

	set_origin(vc);
	if (vc->vc_sw->con_flush_scrollback) {
		vc->vc_sw->con_flush_scrollback(vc);
	} else if (con_is_visible(vc)) {
		/*
		 * When no con_flush_scrollback method is provided then the
		 * legacy way for flushing the scrollback buffer is to use
		 * a side effect of the con_switch method. We do it only on
		 * the foreground console as background consoles have no
		 * scrollback buffers in that case and we obviously don't
		 * want to switch to them.
		 */
		hide_cursor(vc);
		vc->vc_sw->con_switch(vc);
		set_cursor(vc);
	}
}
static void flush_scrollback(struct vc_data *vc)
{
	WARN_CONSOLE_UNLOCKED();

	set_origin(vc);
	if (vc->vc_sw->con_flush_scrollback) {
		vc->vc_sw->con_flush_scrollback(vc);
	} else if (con_is_visible(vc)) {
		 
		hide_cursor(vc);
		vc->vc_sw->con_switch(vc);
		set_cursor(vc);
	}
}