linux-kernel - Re: [RFC PATCH] kernel: add byteorder macros with alignment fixups

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Date:	Thu, 20 Mar 2008 12:22:33 -0700
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-netdev <netdev@...r.kernel.org>
Subject: Re: [RFC PATCH] kernel: add byteorder macros with alignment fixups

Create linux/unaligned.h to hold a common pattern in the kernel:

le32_to_cpu(get_unaligned((__le32 *)x));

Repeat for various combinations of le/be and 64/32/16 bit.  Add
a variant that operates on possibly unaligned pointers to
byteorder/generic.h

Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
---
Now the indirect include of asm/unaligned is opt-in when places
add the linux/unaligned header.

 include/linux/unaligned.h |   42 ++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 42 insertions(+), 0 deletions(-)

diff --git a/include/linux/unaligned.h b/include/linux/unaligned.h
new file mode 100644
index 0000000..7d8fddc
--- /dev/null
+++ b/include/linux/unaligned.h
@@ -0,0 +1,42 @@
+#ifndef _LINUX_UNALIGNED_H_
+#define _LINUX_UNALIGNED_H_
+
+#include <linux/types.h>
+#include <asm/byteorder.h>
+#include <asm/unaligned.h>
+
+#ifdef __KERNEL__
+
+static inline u64 le64_to_cpu_unaligned(void *p)
+{
+	return __le64_to_cpu(get_unaligned((__le64 *)p));
+}
+
+static inline u32 le32_to_cpu_unaligned(void *p)
+{
+	return __le32_to_cpu(get_unaligned((__le32 *)p));
+}
+
+static inline u16 le16_to_cpu_unaligned(void *p)
+{
+	return __le16_to_cpu(get_unaligned((__le16 *)p));
+}
+
+static inline u64 be64_to_cpu_unaligned(void *p)
+{
+	return __be64_to_cpu(get_unaligned((__be64 *)p));
+}
+
+static inline u32 be32_to_cpu_unaligned(void *p)
+{
+	return __be32_to_cpu(get_unaligned((__be32 *)p));
+}
+
+static inline u16 be16_to_cpu_unaligned(void *p)
+{
+	return __be16_to_cpu(get_unaligned((__be16 *)p));
+}
+
+#endif /* KERNEL */
+
+#endif /* _LINUX_UNALIGNED_H */
-- 
1.5.4.4.684.g0e08



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