linux-kernel - [PATCH] types.h: define __aligned

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Message-ID: <20101015042455.12772.27482.stgit@paris.rdu.redhat.com>
Date:	Fri, 15 Oct 2010 00:24:55 -0400
From:	Eric Paris <eparis@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, jengelh@...ozas.de, davem@...emloft.net,
	andi@...stfloor.org
Subject: [PATCH] types.h: define __aligned_u64 and expose to userspace

We currently have a kernel internal type called aligned_u64 which aligns
__u64's on 8 bytes boundaries even on systems which would normally align
them on 4 byte boundaries.  This patch creates a new type __aligned_u64
which does the same thing but which is exposed to userspace rather than
being kernel internal.

Based-on-patch-by: Andreas Gruenbacher <agruen@...e.de>
Signed-off-by: Eric Paris <eparis@...hat.com>
---

 include/linux/types.h |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/include/linux/types.h b/include/linux/types.h
index 01a082f..194e90b 100644
--- a/include/linux/types.h
+++ b/include/linux/types.h
@@ -178,6 +178,11 @@ typedef __u64 __bitwise __be64;
 typedef __u16 __bitwise __sum16;
 typedef __u32 __bitwise __wsum;
 
+/* this is a special 64bit data type that is 8-byte aligned */
+#define __aligned_u64 __u64 __attribute__((aligned(8)))
+#define __aligned_be64 __be64 __attribute__((aligned(8)))
+#define __aligned_le64 __le64 __attribute__((aligned(8)))
+
 #ifdef __KERNEL__
 typedef unsigned __bitwise__ gfp_t;
 typedef unsigned __bitwise__ fmode_t;

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