linux-kernel - [PATCH] serial: sa1100: make sa1100_register_uart

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Date:	Thu, 25 Feb 2016 15:33:46 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-serial@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] serial: sa1100: make sa1100_register_uart_fns a function

Calling sa1100_register_uart_fns() leaves the port structure
unused when CONFIG_SERIAL_SA1100 is disabled, and we get a
compiler warning about that:

arch/arm/mach-sa1100/badge4.c:317:31: warning: 'badge4_port_fns' defined but not used [-Wunused-variable]
 static struct sa1100_port_fns badge4_port_fns __initdata = {

This turns the two empty macros into empty inline functions,
which has the same effect, but lets the compiler know that the
variables are intentionally unused.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Acked-by: Linus Walleij <linus.walleij@...aro.org>
---
 include/linux/platform_data/sa11x0-serial.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/linux/platform_data/sa11x0-serial.h b/include/linux/platform_data/sa11x0-serial.h
index 4504d5d592f0..009e1d83fe39 100644
--- a/include/linux/platform_data/sa11x0-serial.h
+++ b/include/linux/platform_data/sa11x0-serial.h
@@ -26,8 +26,12 @@ struct sa1100_port_fns {
 void sa1100_register_uart_fns(struct sa1100_port_fns *fns);
 void sa1100_register_uart(int idx, int port);
 #else
-#define sa1100_register_uart_fns(fns) do { } while (0)
-#define sa1100_register_uart(idx,port) do { } while (0)
+static inline void sa1100_register_uart_fns(struct sa1100_port_fns *fns)
+{
+}
+static inline void sa1100_register_uart(int idx, int port)
+{
+}
 #endif
 
 #endif
-- 
2.7.0