--- zzzz-none-000/linux-4.4.271/include/linux/console.h	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/include/linux/console.h	2023-04-19 10:22:30.000000000 +0000
@@ -116,6 +116,7 @@
 #define CON_ANYTIME	(16) /* Safe to call when cpu is offline */
 #define CON_BRL		(32) /* Used for a braille device */
 #define CON_EXTENDED	(64) /* Use the extended output format a la /dev/kmsg */
+#define CON_MUTED	(128) /* mute console output */
 
 struct console {
 	char	name[16];
@@ -128,6 +129,7 @@
 	short	flags;
 	short	index;
 	int	cflag;
+	int	baud;
 	void	*data;
 	struct	 console *next;
 };
@@ -154,6 +156,10 @@
 extern struct tty_driver *console_device(int *);
 extern void console_stop(struct console *);
 extern void console_start(struct console *);
+extern void console_mute(struct console *);
+extern void console_mute_nolock(struct console *);
+extern void console_unmute(struct console *);
+extern void console_unmute_nolock(struct console *);
 extern int is_console_locked(void);
 extern int braille_register_console(struct console *, int index,
 		char *console_options, char *braille_options);