[PATCH 2/2] endian: Always evaluate arguments

[Antony Pavlov]

From: "David S. Miller" <davem at davemloft.net>

This patch is based on

    commit 3d6f4a20cc287a8980c6186624834cf10a70752b
    Author: David Miller <davem at davemloft.net>
    Date:   Thu Jul 24 23:38:31 2008 -0700

        endian: Always evaluate arguments.

In barebox.git/drivers/usb/core/usb.c,
function usb_parse_config() we have had

    le16_to_cpus(&(dev->config.wTotalLength));

which evaluates to "do { } while (0)" on little endian,
so struct usb_configuration field misuse will never
be discovered on little endian.

Therefore, always evaluate the arguments to nop endian
transformation operations.

Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Antony Pavlov <antonynpavlov at gmail.com>
---
 include/linux/byteorder/big_endian.h    | 12 ++++++------
 include/linux/byteorder/little_endian.h | 12 ++++++------
 2 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/include/linux/byteorder/big_endian.h b/include/linux/byteorder/big_endian.h
index 09fb188..e560ef6 100644
--- a/include/linux/byteorder/big_endian.h
+++ b/include/linux/byteorder/big_endian.h
@@ -57,12 +57,12 @@
 #define __le32_to_cpus(x) __swab32s((x))
 #define __cpu_to_le16s(x) __swab16s((x))
 #define __le16_to_cpus(x) __swab16s((x))
-#define __cpu_to_be64s(x) do {} while (0)
-#define __be64_to_cpus(x) do {} while (0)
-#define __cpu_to_be32s(x) do {} while (0)
-#define __be32_to_cpus(x) do {} while (0)
-#define __cpu_to_be16s(x) do {} while (0)
-#define __be16_to_cpus(x) do {} while (0)
+#define __cpu_to_be64s(x) do { (void)(x); } while (0)
+#define __be64_to_cpus(x) do { (void)(x); } while (0)
+#define __cpu_to_be32s(x) do { (void)(x); } while (0)
+#define __be32_to_cpus(x) do { (void)(x); } while (0)
+#define __cpu_to_be16s(x) do { (void)(x); } while (0)
+#define __be16_to_cpus(x) do { (void)(x); } while (0)
 
 #include <linux/byteorder/generic.h>
 
diff --git a/include/linux/byteorder/little_endian.h b/include/linux/byteorder/little_endian.h
index 5870a6e..a821b27 100644
--- a/include/linux/byteorder/little_endian.h
+++ b/include/linux/byteorder/little_endian.h
@@ -51,12 +51,12 @@
 #define __be32_to_cpup(x) __swab32p((x))
 #define __cpu_to_be16p(x) __swab16p((x))
 #define __be16_to_cpup(x) __swab16p((x))
-#define __cpu_to_le64s(x) do {} while (0)
-#define __le64_to_cpus(x) do {} while (0)
-#define __cpu_to_le32s(x) do {} while (0)
-#define __le32_to_cpus(x) do {} while (0)
-#define __cpu_to_le16s(x) do {} while (0)
-#define __le16_to_cpus(x) do {} while (0)
+#define __cpu_to_le64s(x) do { (void)(x); } while (0)
+#define __le64_to_cpus(x) do { (void)(x); } while (0)
+#define __cpu_to_le32s(x) do { (void)(x); } while (0)
+#define __le32_to_cpus(x) do { (void)(x); } while (0)
+#define __cpu_to_le16s(x) do { (void)(x); } while (0)
+#define __le16_to_cpus(x) do { (void)(x); } while (0)
 #define __cpu_to_be64s(x) __swab64s((x))
 #define __be64_to_cpus(x) __swab64s((x))
 #define __cpu_to_be32s(x) __swab32s((x))
-- 
2.5.0