linux-kernel - [PATCH 11/16] byteorder: provide a linux/byteorder.h with {be,le}_to_cpu() and cpu_to

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Date:	Tue, 27 May 2014 17:22:06 -0700
From:	Cody P Schafer <dev@...yps.com>
To:	LKML <linux-kernel@...r.kernel.org>,
	Linux PPC <linuxppc-dev@...ts.ozlabs.org>,
	Cody P Schafer <dev@...yps.com>
Cc:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Subject: [PATCH 11/16] byteorder: provide a linux/byteorder.h with {be,le}_to_cpu() and cpu_to_{be,le}() macros

Rather manually specifying the size of the integer to be converted, key
off of the type size. Reduces duplicate size info and the occurance of
certain types of bugs (using the wrong sized conversion).

CC: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Signed-off-by: Cody P Schafer <dev@...yps.com>
---
 include/linux/byteorder.h | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 include/linux/byteorder.h

diff --git a/include/linux/byteorder.h b/include/linux/byteorder.h
new file mode 100644
index 0000000..c7ab8da
--- /dev/null
+++ b/include/linux/byteorder.h
@@ -0,0 +1,34 @@
+#ifndef LINUX_BYTEORDER_H_
+#define LINUX_BYTEORDER_H_
+
+#include <asm/byteorder.h>
+
+#define be_to_cpu(v) \
+	__builtin_choose_expr(sizeof(v) == sizeof(uint8_t) , v,	\
+	__builtin_choose_expr(sizeof(v) == sizeof(uint16_t), be16_to_cpu(v), \
+	__builtin_choose_expr(sizeof(v) == sizeof(uint32_t), be32_to_cpu(v), \
+	__builtin_choose_expr(sizeof(v) == sizeof(uint64_t), be64_to_cpu(v), \
+		(void)0))))
+
+#define le_to_cpu(v) \
+	__builtin_choose_expr(sizeof(v) == sizeof(uint8_t) , v,	\
+	__builtin_choose_expr(sizeof(v) == sizeof(uint16_t), le16_to_cpu(v), \
+	__builtin_choose_expr(sizeof(v) == sizeof(uint32_t), le32_to_cpu(v), \
+	__builtin_choose_expr(sizeof(v) == sizeof(uint64_t), le64_to_cpu(v), \
+		(void)0))))
+
+#define cpu_to_le(v) \
+	__builtin_choose_expr(sizeof(v) == sizeof(uint8_t) , v,	\
+	__builtin_choose_expr(sizeof(v) == sizeof(uint16_t), cpu_to_le16(v), \
+	__builtin_choose_expr(sizeof(v) == sizeof(uint32_t), cpu_to_le32(v), \
+	__builtin_choose_expr(sizeof(v) == sizeof(uint64_t), cpu_to_le64(v), \
+		(void)0))))
+
+#define cpu_to_be(v) \
+	__builtin_choose_expr(sizeof(v) == sizeof(uint8_t) , v,	\
+	__builtin_choose_expr(sizeof(v) == sizeof(uint16_t), cpu_to_be16(v), \
+	__builtin_choose_expr(sizeof(v) == sizeof(uint32_t), cpu_to_be32(v), \
+	__builtin_choose_expr(sizeof(v) == sizeof(uint64_t), cpu_to_be64(v), \
+		(void)0))))
+
+#endif
-- 
1.9.3

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