linux-kernel - [PATCH v2 2/3] tty: Make constants to be enums instead of #define in goldfish.c

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Message-Id: <20180725005133.107823-2-rkir@google.com>
Date:   Tue, 24 Jul 2018 17:51:32 -0700
From:   rkir@...gle.com
To:     gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, Roman Kiryanov <rkir@...gle.com>
Subject: [PATCH v2 2/3] tty: Make constants to be enums instead of #define in goldfish.c

From: Roman Kiryanov <rkir@...gle.com>

enums produce better compilation errors than defines.

Signed-off-by: Roman Kiryanov <rkir@...gle.com>
---
Changes in v2:
 - Added the enum types (goldfish_tty_reg and goldfish_tty_cmd).

 drivers/tty/goldfish.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/drivers/tty/goldfish.c b/drivers/tty/goldfish.c
index a92fcb2b0002..173383f2a4c1 100644
--- a/drivers/tty/goldfish.c
+++ b/drivers/tty/goldfish.c
@@ -19,18 +19,22 @@
 #include <linux/serial_core.h>
 
 /* Goldfish tty register's offsets */
-#define	GOLDFISH_TTY_REG_BYTES_READY	0x04
-#define	GOLDFISH_TTY_REG_CMD		0x08
-#define	GOLDFISH_TTY_REG_DATA_PTR	0x10
-#define	GOLDFISH_TTY_REG_DATA_LEN	0x14
-#define	GOLDFISH_TTY_REG_DATA_PTR_HIGH	0x18
-#define	GOLDFISH_TTY_REG_VERSION	0x20
+enum goldfish_tty_reg {
+	GOLDFISH_TTY_REG_BYTES_READY	= 0x04,
+	GOLDFISH_TTY_REG_CMD		= 0x08,
+	GOLDFISH_TTY_REG_DATA_PTR	= 0x10,
+	GOLDFISH_TTY_REG_DATA_LEN	= 0x14,
+	GOLDFISH_TTY_REG_DATA_PTR_HIGH	= 0x18,
+	GOLDFISH_TTY_REG_VERSION	= 0x20,
+};
 
 /* Goldfish tty commands */
-#define	GOLDFISH_TTY_CMD_INT_DISABLE	0
-#define	GOLDFISH_TTY_CMD_INT_ENABLE	1
-#define	GOLDFISH_TTY_CMD_WRITE_BUFFER	2
-#define	GOLDFISH_TTY_CMD_READ_BUFFER	3
+enum goldfish_tty_cmd {
+	GOLDFISH_TTY_CMD_INT_DISABLE	= 0,
+	GOLDFISH_TTY_CMD_INT_ENABLE	= 1,
+	GOLDFISH_TTY_CMD_WRITE_BUFFER	= 2,
+	GOLDFISH_TTY_CMD_READ_BUFFER	= 3,
+};
 
 struct goldfish_tty {
 	struct tty_port port;
-- 
2.18.0.233.g985f88cf7e-goog