1 #include <linux/tty.h> 2 #include <linux/module.h> 3 #include <linux/kallsyms.h> 4 #include <linux/semaphore.h> 5 #include <linux/sched.h> 6 7 /* 8 * The 'big tty mutex' 9 * 10 * This mutex is taken and released by tty_lock() and tty_unlock(), 11 * replacing the older big kernel lock. 12 * It can no longer be taken recursively, and does not get 13 * released implicitly while sleeping. 14 * 15 * Don't use in new code. 16 */ 17 static DEFINE_MUTEX(big_tty_mutex); 18 19 /* 20 * Getting the big tty mutex. 21 */ 22 void __lockfunc tty_lock(void) 23 { 24 mutex_lock(&big_tty_mutex); 25 } 26 EXPORT_SYMBOL(tty_lock); 27 28 void __lockfunc tty_unlock(void) 29 { 30 mutex_unlock(&big_tty_mutex); 31 } 32 EXPORT_SYMBOL(tty_unlock); 33