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authorGabor Juhos <juhosg@openwrt.org>2013-08-28 17:08:39 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-08-28 16:00:42 -0700
commit124155351331a53feb00d10874f0c620405fd385 (patch)
treed07b24b0a57e132893704faa806c9472112d2822 /drivers/tty
parent0710e5626f524a26fe5992adb91a6289b2139928 (diff)
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tty: ar933x_uart: use config_enabled() macro to clean up ifdefs
Add a new ar933x_uart_console_enabled() helper function which uses the config_enable(CONFIG_SERIAL_AR933X_CONSOLE) macro to decide if the console support is enabled or not. Remove the 'ifdef CONFIG_SERIAL_AR933X_CONSOLE' statements and use the new helper function to conditionally enable console support instead. If CONFIG_SERIAL_AR933X_CONSOLE is not enabled, the new helper function will become a null stub which allows the compiler to optimize out the unused console specific functions/variables. Signed-off-by: Gabor Juhos <juhosg@openwrt.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/ar933x_uart.c25
1 files changed, 12 insertions, 13 deletions
diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c
index 2d83a45dcc8d..0437a9e08d58 100644
--- a/drivers/tty/serial/ar933x_uart.c
+++ b/drivers/tty/serial/ar933x_uart.c
@@ -50,6 +50,11 @@ struct ar933x_uart_port {
struct clk *clk;
};
+static inline bool ar933x_uart_console_enabled(void)
+{
+ return config_enabled(CONFIG_SERIAL_AR933X_CONSOLE);
+}
+
static inline unsigned int ar933x_uart_read(struct ar933x_uart_port *up,
int offset)
{
@@ -500,8 +505,6 @@ static struct uart_ops ar933x_uart_ops = {
.verify_port = ar933x_uart_verify_port,
};
-#ifdef CONFIG_SERIAL_AR933X_CONSOLE
-
static struct ar933x_uart_port *
ar933x_console_ports[CONFIG_SERIAL_AR933X_NR_UARTS];
@@ -600,25 +603,18 @@ static struct console ar933x_uart_console = {
static void ar933x_uart_add_console_port(struct ar933x_uart_port *up)
{
+ if (!ar933x_uart_console_enabled())
+ return;
+
ar933x_console_ports[up->port.line] = up;
}
-#define AR933X_SERIAL_CONSOLE (&ar933x_uart_console)
-
-#else
-
-static inline void ar933x_uart_add_console_port(struct ar933x_uart_port *up) {}
-
-#define AR933X_SERIAL_CONSOLE NULL
-
-#endif /* CONFIG_SERIAL_AR933X_CONSOLE */
-
static struct uart_driver ar933x_uart_driver = {
.owner = THIS_MODULE,
.driver_name = DRIVER_NAME,
.dev_name = "ttyATH",
.nr = CONFIG_SERIAL_AR933X_NR_UARTS,
- .cons = AR933X_SERIAL_CONSOLE,
+ .cons = NULL, /* filled in runtime */
};
static int ar933x_uart_probe(struct platform_device *pdev)
@@ -730,6 +726,9 @@ static int __init ar933x_uart_init(void)
{
int ret;
+ if (ar933x_uart_console_enabled())
+ ar933x_uart_driver.cons = &ar933x_uart_console;
+
ret = uart_register_driver(&ar933x_uart_driver);
if (ret)
goto err_out;