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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>
This commit is contained in:
Gabor Juhos 2013-08-28 17:08:39 +02:00 committed by Greg Kroah-Hartman
parent 0710e5626f
commit 1241553513
1 changed files with 12 additions and 13 deletions
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25
drivers/tty/serial/ar933x_uart.c
View File

@ -50,6 +50,11 @@ struct ar933x_uart_port {
struct clk *clk; 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, static inline unsigned int ar933x_uart_read(struct ar933x_uart_port *up,
int offset) int offset)
{ {
@ -500,8 +505,6 @@ static struct uart_ops ar933x_uart_ops = {
.verify_port = ar933x_uart_verify_port, .verify_port = ar933x_uart_verify_port,
}; };
#ifdef CONFIG_SERIAL_AR933X_CONSOLE
static struct ar933x_uart_port * static struct ar933x_uart_port *
ar933x_console_ports[CONFIG_SERIAL_AR933X_NR_UARTS]; 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) 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; 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 = { static struct uart_driver ar933x_uart_driver = {
.owner = THIS_MODULE, .owner = THIS_MODULE,
.driver_name = DRIVER_NAME, .driver_name = DRIVER_NAME,
.dev_name = "ttyATH", .dev_name = "ttyATH",
.nr = CONFIG_SERIAL_AR933X_NR_UARTS, .nr = CONFIG_SERIAL_AR933X_NR_UARTS,
.cons = AR933X_SERIAL_CONSOLE, .cons = NULL, /* filled in runtime */
}; };
static int ar933x_uart_probe(struct platform_device *pdev) static int ar933x_uart_probe(struct platform_device *pdev)
@ -730,6 +726,9 @@ static int __init ar933x_uart_init(void)
{ {
int ret; int ret;
if (ar933x_uart_console_enabled())
ar933x_uart_driver.cons = &ar933x_uart_console;
ret = uart_register_driver(&ar933x_uart_driver); ret = uart_register_driver(&ar933x_uart_driver);
if (ret) if (ret)
goto err_out; goto err_out;