void redraw_screen(struct vc_data *vc, int is_switch)
{
	int redraw = 0;

	WARN_CONSOLE_UNLOCKED();

	if (!vc) {
		/* strange ... */
		/* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
		return;
	}

	if (is_switch) {
		struct vc_data *old_vc = vc_cons[fg_console].d;
		if (old_vc == vc)
			return;
		if (!con_is_visible(vc))
			redraw = 1;
		*vc->vc_display_fg = vc;
		fg_console = vc->vc_num;
		hide_cursor(old_vc);
		if (!con_is_visible(old_vc)) {
			save_screen(old_vc);
			set_origin(old_vc);
		}
		if (tty0dev)
			sysfs_notify(&tty0dev->kobj, NULL, "active");
	} else {
		hide_cursor(vc);
		redraw = 1;
	}

	if (redraw) {
		int update;
		int old_was_color = vc->vc_can_do_color;

		set_origin(vc);
		update = vc->vc_sw->con_switch(vc);
		set_palette(vc);
		/*
		 * If console changed from mono<->color, the best we can do
		 * is to clear the buffer attributes. As it currently stands,
		 * rebuilding new attributes from the old buffer is not doable
		 * without overly complex code.
		 */
		if (old_was_color != vc->vc_can_do_color) {
			update_attr(vc);
			clear_buffer_attributes(vc);
		}

		if (update && vc->vc_mode != KD_GRAPHICS)
			do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
	}
	set_cursor(vc);
	if (is_switch) {
		set_leds();
		compute_shiftstate();
		notify_update(vc);
	}
}
void redraw_screen(struct vc_data *vc, int is_switch)
{
	int redraw = 0;

	WARN_CONSOLE_UNLOCKED();

	if (!vc) {
		 
		 
		return;
	}

	if (is_switch) {
		struct vc_data *old_vc = vc_cons[fg_console].d;
		if (old_vc == vc)
			return;
		if (!con_is_visible(vc))
			redraw = 1;
		*vc->vc_display_fg = vc;
		fg_console = vc->vc_num;
		hide_cursor(old_vc);
		if (!con_is_visible(old_vc)) {
			save_screen(old_vc);
			set_origin(old_vc);
		}
		if (tty0dev)
			sysfs_notify(&tty0dev->kobj, NULL, "active");
	} else {
		hide_cursor(vc);
		redraw = 1;
	}

	if (redraw) {
		int update;
		int old_was_color = vc->vc_can_do_color;

		set_origin(vc);
		update = vc->vc_sw->con_switch(vc);
		set_palette(vc);
		 
		if (old_was_color != vc->vc_can_do_color) {
			update_attr(vc);
			clear_buffer_attributes(vc);
		}

		if (update && vc->vc_mode != KD_GRAPHICS)
			do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
	}
	set_cursor(vc);
	if (is_switch) {
		set_leds();
		compute_shiftstate();
		notify_update(vc);
	}
}