linux-kernel - [PATCH 2/6] tty: Eliminate global symbol tty_ldisc_N

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Message-Id: <1448678317-9093-3-git-send-email-peter@hurleysoftware.com>
Date:	Fri, 27 Nov 2015 21:38:33 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org,
	Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH 2/6] tty: Eliminate global symbol tty_ldisc_N_TTY

Reduce global tty symbols; move and rename tty_ldisc_begin() as
n_tty_init() and redefine the N_TTY ldisc ops as file scope.

Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
 drivers/tty/n_tty.c     | 12 ++++++++----
 drivers/tty/tty_io.c    |  2 +-
 drivers/tty/tty_ldisc.c |  6 ------
 include/linux/tty.h     |  3 +--
 4 files changed, 10 insertions(+), 13 deletions(-)

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 4f2b5dc..d294e24 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -2499,7 +2499,7 @@ static void n_tty_closing(struct tty_struct *tty)
 	ldata->closing = 1;
 }
 
-struct tty_ldisc_ops tty_ldisc_N_TTY = {
+static struct tty_ldisc_ops n_tty_ops = {
 	.magic           = TTY_LDISC_MAGIC,
 	.name            = "n_tty",
 	.open            = n_tty_open,
@@ -2521,14 +2521,18 @@ struct tty_ldisc_ops tty_ldisc_N_TTY = {
  *	n_tty_inherit_ops	-	inherit N_TTY methods
  *	@ops: struct tty_ldisc_ops where to save N_TTY methods
  *
- *	Enables a 'subclass' line discipline to 'inherit' N_TTY
- *	methods.
+ *	Enables a 'subclass' line discipline to 'inherit' N_TTY methods.
  */
 
 void n_tty_inherit_ops(struct tty_ldisc_ops *ops)
 {
-	*ops = tty_ldisc_N_TTY;
+	*ops = n_tty_ops;
 	ops->owner = NULL;
 	ops->refcount = ops->flags = 0;
 }
 EXPORT_SYMBOL_GPL(n_tty_inherit_ops);
+
+void __init n_tty_init(void)
+{
+	tty_register_ldisc(N_TTY, &n_tty_ops);
+}
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 64c4a7e..0778fa9 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -3566,7 +3566,7 @@ void __init console_init(void)
 	initcall_t *call;
 
 	/* Setup the default TTY line discipline. */
-	tty_ldisc_begin();
+	n_tty_init();
 
 	/*
 	 * set up the console device so that later boot sequences can
diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index 8a960fd..5734c22 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -840,9 +840,3 @@ void tty_ldisc_deinit(struct tty_struct *tty)
 		tty_ldisc_put(tty->ldisc);
 	tty->ldisc = NULL;
 }
-
-void tty_ldisc_begin(void)
-{
-	/* Setup the default TTY line discipline. */
-	(void) tty_register_ldisc(N_TTY, &tty_ldisc_N_TTY);
-}
diff --git a/include/linux/tty.h b/include/linux/tty.h
index cc15147..9e3231e 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -577,7 +577,6 @@ extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
 extern void tty_ldisc_release(struct tty_struct *tty);
 extern void tty_ldisc_init(struct tty_struct *tty);
 extern void tty_ldisc_deinit(struct tty_struct *tty);
-extern void tty_ldisc_begin(void);
 
 static inline int tty_ldisc_receive_buf(struct tty_ldisc *ld, unsigned char *p,
 					char *f, int count)
@@ -594,8 +593,8 @@ static inline int tty_ldisc_receive_buf(struct tty_ldisc *ld, unsigned char *p,
 
 
 /* n_tty.c */
-extern struct tty_ldisc_ops tty_ldisc_N_TTY;
 extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
+extern void __init n_tty_init(void);
 
 /* tty_audit.c */
 #ifdef CONFIG_AUDIT
-- 
2.6.3

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