tty: clean include/linux/tty.h up

There are a lot of tty-core-only functions that are listed in
include/linux/tty.h.  Move them to drivers/tty/tty.h so that no one else
can accidentally call them or think that they are public functions.

Cc: Jiri Slaby <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20210408125134.3016837-14-gregkh@linuxfoundation.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/n_gsm.c

@@ -50,6 +50,7 @@
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/gsmmux.h>
+#include "tty.h"
 
 static int debug;
 module_param(debug, int, 0600);

drivers/tty/n_hdlc.c

@@ -100,6 +100,7 @@
 
 #include <asm/termios.h>
 #include <linux/uaccess.h>
+#include "tty.h"
 
 /*
  * Buffers for individual HDLC frames

drivers/tty/tty.h

@@ -58,6 +58,43 @@ static inline void tty_set_flow_change(struct tty_struct *tty, int val)
 int tty_ldisc_lock(struct tty_struct *tty, unsigned long timeout);
 void tty_ldisc_unlock(struct tty_struct *tty);
 
+int __tty_check_change(struct tty_struct *tty, int sig);
+int tty_check_change(struct tty_struct *tty);
+void __stop_tty(struct tty_struct *tty);
+void __start_tty(struct tty_struct *tty);
+void tty_vhangup_session(struct tty_struct *tty);
+void tty_open_proc_set_tty(struct file *filp, struct tty_struct *tty);
+int tty_signal_session_leader(struct tty_struct *tty, int exit_session);
+void session_clear_tty(struct pid *session);
+void tty_buffer_free_all(struct tty_port *port);
+void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld);
+void tty_buffer_init(struct tty_port *port);
+void tty_buffer_set_lock_subclass(struct tty_port *port);
+bool tty_buffer_restart_work(struct tty_port *port);
+bool tty_buffer_cancel_work(struct tty_port *port);
+void tty_buffer_flush_work(struct tty_port *port);
+speed_t tty_termios_input_baud_rate(struct ktermios *termios);
+void tty_ldisc_hangup(struct tty_struct *tty, bool reset);
+int tty_ldisc_reinit(struct tty_struct *tty, int disc);
+long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
+long tty_jobctrl_ioctl(struct tty_struct *tty, struct tty_struct *real_tty,
+		       struct file *file, unsigned int cmd, unsigned long arg);
+void tty_default_fops(struct file_operations *fops);
+struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx);
+int tty_alloc_file(struct file *file);
+void tty_add_file(struct tty_struct *tty, struct file *file);
+void tty_free_file(struct file *file);
+int tty_release(struct inode *inode, struct file *filp);
+
+#define tty_is_writelocked(tty)  (mutex_is_locked(&tty->atomic_write_lock))
+
+int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
+void tty_ldisc_release(struct tty_struct *tty);
+int __must_check tty_ldisc_init(struct tty_struct *tty);
+void tty_ldisc_deinit(struct tty_struct *tty);
+
+void tty_sysctl_init(void);
+
 /* tty_audit.c */
 #ifdef CONFIG_AUDIT
 void tty_audit_add_data(struct tty_struct *tty, const void *data, size_t size);

drivers/tty/tty_baudrate.c

@@ -8,6 +8,7 @@
 #include <linux/termios.h>
 #include <linux/tty.h>
 #include <linux/export.h>
+#include "tty.h"
 
 
 /*

include/linux/tty.h

@@ -432,11 +432,7 @@ static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
 
 extern const char *tty_driver_name(const struct tty_struct *tty);
 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
-extern int __tty_check_change(struct tty_struct *tty, int sig);
-extern int tty_check_change(struct tty_struct *tty);
-extern void __stop_tty(struct tty_struct *tty);
 extern void stop_tty(struct tty_struct *tty);
-extern void __start_tty(struct tty_struct *tty);
 extern void start_tty(struct tty_struct *tty);
 extern int tty_register_driver(struct tty_driver *driver);
 extern void tty_unregister_driver(struct tty_driver *driver);
@@ -463,23 +459,11 @@ extern int tty_get_icount(struct tty_struct *tty,
 extern int is_current_pgrp_orphaned(void);
 extern void tty_hangup(struct tty_struct *tty);
 extern void tty_vhangup(struct tty_struct *tty);
-extern void tty_vhangup_session(struct tty_struct *tty);
 extern int tty_hung_up_p(struct file *filp);
 extern void do_SAK(struct tty_struct *tty);
 extern void __do_SAK(struct tty_struct *tty);
-extern void tty_open_proc_set_tty(struct file *filp, struct tty_struct *tty);
-extern int tty_signal_session_leader(struct tty_struct *tty, int exit_session);
-extern void session_clear_tty(struct pid *session);
 extern void no_tty(void);
-extern void tty_buffer_free_all(struct tty_port *port);
-extern void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld);
-extern void tty_buffer_init(struct tty_port *port);
-extern void tty_buffer_set_lock_subclass(struct tty_port *port);
-extern bool tty_buffer_restart_work(struct tty_port *port);
-extern bool tty_buffer_cancel_work(struct tty_port *port);
-extern void tty_buffer_flush_work(struct tty_port *port);
 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
-extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
 						speed_t ibaud, speed_t obaud);
 extern void tty_encode_baud_rate(struct tty_struct *tty,
@@ -507,27 +491,16 @@ extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
 extern void tty_ldisc_deref(struct tty_ldisc *);
 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
-extern void tty_ldisc_hangup(struct tty_struct *tty, bool reset);
-extern int tty_ldisc_reinit(struct tty_struct *tty, int disc);
 extern const struct seq_operations tty_ldiscs_seq_ops;
 
 extern void tty_wakeup(struct tty_struct *tty);
 extern void tty_ldisc_flush(struct tty_struct *tty);
 
-extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
 			unsigned int cmd, unsigned long arg);
-extern long tty_jobctrl_ioctl(struct tty_struct *tty, struct tty_struct *real_tty,
-			      struct file *file, unsigned int cmd, unsigned long arg);
 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
-extern void tty_default_fops(struct file_operations *fops);
-extern struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx);
-extern int tty_alloc_file(struct file *file);
-extern void tty_add_file(struct tty_struct *tty, struct file *file);
-extern void tty_free_file(struct file *file);
 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
 extern void tty_release_struct(struct tty_struct *tty, int idx);
-extern int tty_release(struct inode *inode, struct file *filp);
 extern void tty_init_termios(struct tty_struct *tty);
 extern void tty_save_termios(struct tty_struct *tty);
 extern int tty_standard_install(struct tty_driver *driver,
@@ -535,8 +508,6 @@ extern int tty_standard_install(struct tty_driver *driver,
 
 extern struct mutex tty_mutex;
 
-#define tty_is_writelocked(tty)  (mutex_is_locked(&tty->atomic_write_lock))
-
 extern void tty_port_init(struct tty_port *port);
 extern void tty_port_link_device(struct tty_port *port,
 		struct tty_driver *driver, unsigned index);
@@ -656,13 +627,8 @@ static inline int tty_port_users(struct tty_port *port)
 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
 extern int tty_unregister_ldisc(int disc);
 extern int tty_set_ldisc(struct tty_struct *tty, int disc);
-extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
-extern void tty_ldisc_release(struct tty_struct *tty);
-extern int __must_check tty_ldisc_init(struct tty_struct *tty);
-extern void tty_ldisc_deinit(struct tty_struct *tty);
 extern int tty_ldisc_receive_buf(struct tty_ldisc *ld, const unsigned char *p,
 				 char *f, int count);
-extern void tty_sysctl_init(void);
 
 /* n_tty.c */
 extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);