commit 6b3cddccf4eec0883feb065aea28dd9770bb17d0
author Peter Hurley <peter@hurleysoftware.com> Sat Apr 11 11:02:36 2015 -0400
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> Wed May 06 22:27:00 2015 +0200
tree 20a4634760f8f402b0950af8e5fa8a9e614568c2
parent bbdfe620b97443e1a127570ca856b000904d42f3

serial: core: Fix unused variable warnings from uart_console()

If CONFIG_SERIAL_CORE_CONSOLE=n, build warnings are generated by
uart_console() macro expansion:

drivers/tty/serial/of_serial.c: In function ‘of_serial_suspend_8250’:
drivers/tty/serial/of_serial.c:262:20: warning: unused variable ‘port’ [-Wunused-variable]
  struct uart_port *port = &port8250->port;
                    ^
drivers/tty/serial/of_serial.c: In function ‘of_serial_resume_8250’:
drivers/tty/serial/of_serial.c:272:20: warning: unused variable ‘port’ [-Wunused-variable]
  struct uart_port *port = &port8250->port;

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/serial_core.h

diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 025dad9..297d4fa 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -35,7 +35,7 @@
 #define uart_console(port) \
 	((port)->cons && (port)->cons->index == (port)->line)
 #else
-#define uart_console(port)      (0)
+#define uart_console(port)      ({ (void)port; 0; })
 #endif
 
 struct uart_port;