From: Jeff Dike <jdike@addtoit.com>
Date: Sat, 10 Feb 2007 09:44:06 +0000 (-0800)
Subject: [PATCH] uml: mostly const a structure
X-Git-Tag: v2.6.21-rc1~274^2~414
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a52f362f864f56238c9036f5c56f763a80e2ddd5;p=linux-2.6

[PATCH] uml: mostly const a structure

The chan_opts structure is mostly const, and needs no locking.  Comment the
lack of locking on the one field that can change.

Make all the other fields const.  It turned out that console_open_chan didn't
use its chan_opts argument, so that is deleted from the function and its
callers.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
index bce9b3427b..7b8baf146a 100644
--- a/arch/um/drivers/chan_kern.c
+++ b/arch/um/drivers/chan_kern.c
@@ -354,8 +354,7 @@ int console_write_chan(struct list_head *chans, const char *buf, int len)
 	return ret;
 }
 
-int console_open_chan(struct line *line, struct console *co,
-		      const struct chan_opts *opts)
+int console_open_chan(struct line *line, struct console *co)
 {
 	int err;
 
@@ -363,7 +362,7 @@ int console_open_chan(struct line *line, struct console *co,
 	if(err)
 		return err;
 
-	printk("Console initialized on /dev/%s%d\n",co->name,co->index);
+	printk("Console initialized on /dev/%s%d\n", co->name, co->index);
 	return 0;
 }
 
diff --git a/arch/um/drivers/ssl.c b/arch/um/drivers/ssl.c
index fe400acc97..475de52783 100644
--- a/arch/um/drivers/ssl.c
+++ b/arch/um/drivers/ssl.c
@@ -38,6 +38,7 @@ static void ssl_announce(char *dev_name, int dev)
 	       dev_name);
 }
 
+/* Almost const, except that xterm_title may be changed in an initcall */
 static struct chan_opts opts = {
 	.announce 	= ssl_announce,
 	.xterm_title	= "Serial Line #%d",
@@ -171,7 +172,7 @@ static int ssl_console_setup(struct console *co, char *options)
 {
 	struct line *line = &serial_lines[co->index];
 
-	return console_open_chan(line, co, &opts);
+	return console_open_chan(line, co);
 }
 
 static struct console ssl_cons = {
diff --git a/arch/um/drivers/stdio_console.c b/arch/um/drivers/stdio_console.c
index 0b1bca4980..a83c42c263 100644
--- a/arch/um/drivers/stdio_console.c
+++ b/arch/um/drivers/stdio_console.c
@@ -42,6 +42,7 @@ void stdio_announce(char *dev_name, int dev)
 	       dev_name);
 }
 
+/* Almost const, except that xterm_title may be changed in an initcall */
 static struct chan_opts opts = {
 	.announce 	= stdio_announce,
 	.xterm_title	= "Virtual Console #%d",
@@ -144,7 +145,7 @@ static int uml_console_setup(struct console *co, char *options)
 {
 	struct line *line = &vts[co->index];
 
-	return console_open_chan(line, co, &opts);
+	return console_open_chan(line, co);
 }
 
 static struct console stdiocons = {
diff --git a/arch/um/include/chan_kern.h b/arch/um/include/chan_kern.h
index 2d9aa7ef4c..c4b41bb103 100644
--- a/arch/um/include/chan_kern.h
+++ b/arch/um/include/chan_kern.h
@@ -36,8 +36,7 @@ extern int write_chan(struct list_head *chans, const char *buf, int len,
 			     int write_irq);
 extern int console_write_chan(struct list_head *chans, const char *buf, 
 			      int len);
-extern int console_open_chan(struct line *line, struct console *co,
-			     const struct chan_opts *opts);
+extern int console_open_chan(struct line *line, struct console *co);
 extern void deactivate_chan(struct list_head *chans, int irq);
 extern void reactivate_chan(struct list_head *chans, int irq);
 extern void chan_enable_winch(struct list_head *chans, struct tty_struct *tty);
diff --git a/arch/um/include/chan_user.h b/arch/um/include/chan_user.h
index a795547a1d..ad671eb9ed 100644
--- a/arch/um/include/chan_user.h
+++ b/arch/um/include/chan_user.h
@@ -9,11 +9,11 @@
 #include "init.h"
 
 struct chan_opts {
-	void (*announce)(char *dev_name, int dev);
+	void (*const announce)(char *dev_name, int dev);
 	char *xterm_title;
-	int raw;
-	unsigned long tramp_stack;
-	int in_kernel;
+	const int raw;
+	const unsigned long tramp_stack;
+	const int in_kernel;
 };
 
 enum chan_init_pri { INIT_STATIC, INIT_ALL, INIT_ONE };