[PATCH] const struct tty_operations

As part of an SMP cleanliness pass over UML, I consted a bunch of
structures in order to not have to document their locking.  One of these
structures was a struct tty_operations.  In order to const it in UML
without introducing compiler complaints, the declaration of
tty_set_operations needs to be changed, and then all of its callers need to
be fixed.

This patch declares all struct tty_operations in the tree as const.  In all
cases, they are static and used only as input to tty_set_operations.  As an
extra check, I ran an i386 allyesconfig build which produced no extra
warnings.

53 drivers are affected.  I checked the history of a bunch of them, and in
most cases, there have been only a handful of maintenance changes in the
last six months.  serial_core.c was the busiest one that I looked at.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/serial/68328serial.c

@@ -1378,7 +1378,7 @@ void startup_console(void)
 #endif /* CONFIG_PM_LEGACY */
 
 
-static struct tty_operations rs_ops = {
+static const struct tty_operations rs_ops = {
 	.open = rs_open,
 	.close = rs_close,
 	.write = rs_write,

drivers/serial/68360serial.c

@@ -2424,7 +2424,7 @@ long console_360_init(long kmem_start, long kmem_end)
 */
 static	int	baud_idx;
 
-static struct tty_operations rs_360_ops = {
+static const struct tty_operations rs_360_ops = {
 	.owner = THIS_MODULE,
 	.open = rs_360_open,
 	.close = rs_360_close,

drivers/serial/crisv10.c

@@ -4825,7 +4825,7 @@ show_serial_version(void)
 
 /* rs_init inits the driver at boot (using the module_init chain) */
 
-static struct tty_operations rs_ops = {
+static const struct tty_operations rs_ops = {
 	.open = rs_open,
 	.close = rs_close,
 	.write = rs_write,

drivers/serial/mcfserial.c

@@ -1666,7 +1666,7 @@ static void show_serial_version(void)
 	printk(mcfrs_drivername);
 }
 
-static struct tty_operations mcfrs_ops = {
+static const struct tty_operations mcfrs_ops = {
 	.open = mcfrs_open,
 	.close = mcfrs_close,
 	.write = mcfrs_write,

drivers/serial/serial_core.c

@@ -2111,7 +2111,7 @@ uart_configure_port(struct uart_driver *drv, struct uart_state *state,
 	}
 }
 
-static struct tty_operations uart_ops = {
+static const struct tty_operations uart_ops = {
 	.open		= uart_open,
 	.close		= uart_close,
 	.write		= uart_write,