#include <linux/tty.h>#include <linux/module.h>#include <linux/kallsyms.h>#include <linux/semaphore.h>#include <linux/sched.h> /* Legacy tty mutex glue */ /* * Getting the big tty mutex. */ void __lockfunc tty_lock(struct tty_struct *tty){	if (tty->magic != TTY_MAGIC) {		pr_err("L Bad %p\n", tty);		WARN_ON(1);		return;	}	tty_kref_get(tty);	mutex_lock(&tty->legacy_mutex);}EXPORT_SYMBOL(tty_lock); void __lockfunc tty_unlock(struct tty_struct *tty){	if (tty->magic != TTY_MAGIC) {		pr_err("U Bad %p\n", tty);		WARN_ON(1);		return;	}	mutex_unlock(&tty->legacy_mutex);	tty_kref_put(tty);}EXPORT_SYMBOL(tty_unlock); void __lockfunc tty_lock_slave(struct tty_struct *tty){	if (tty && tty != tty->link)		tty_lock(tty);} void __lockfunc tty_unlock_slave(struct tty_struct *tty){	if (tty && tty != tty->link)		tty_unlock(tty);} void tty_set_lock_subclass(struct tty_struct *tty){	lockdep_set_subclass(&tty->legacy_mutex, TTY_LOCK_SLAVE);}