tty/serial: Migrate sb1250-duart to use has_sysrq

The SUPPORT_SYSRQ ifdeffery is not nice as:
- May create misunderstanding about sizeof(struct uart_port) between
  different objects
- Prevents moving functions from serial_core.h
- Reduces readability (well, it's ifdeffery - it's hard to follow)

In order to remove SUPPORT_SYSRQ, has_sysrq variable has been added.
Initialise it in driver's probe and remove ifdeffery.

Signed-off-by: Dmitry Safonov <dima@arista.com>
Link: https://lore.kernel.org/r/20191213000657.931618-39-dima@arista.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/sb1250-duart.c b/drivers/tty/serial/sb1250-duart.c
index 329aced26bd84e97c7145817944f80df1c89ab90..cb8185bffe42aba2565a3cb809a932ca6c8cedc1 100644 (file)
--- a/drivers/tty/serial/sb1250-duart.c
+++ b/drivers/tty/serial/sb1250-duart.c
@@ -15,10 +15,6 @@
  *     "BCM1250/BCM1125/BCM1125H User Manual", Broadcom Corporation
  */
 
-#if defined(CONFIG_SERIAL_SB1250_DUART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
-#define SUPPORT_SYSRQ
-#endif
-
 #include <linux/compiler.h>
 #include <linux/console.h>
 #include <linux/delay.h>
@@ -813,6 +809,7 @@ static void __init sbd_probe_duarts(void)
                        uport->ops      = &sbd_ops;
                        uport->line     = line;
                        uport->mapbase  = SBD_CHANREGS(line);
+                       uport->has_sysrq = IS_ENABLED(CONFIG_SERIAL_SB1250_DUART_CONSOLE);
                }
        }
 }