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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.

[akpm: merge early as both the net and audit trees want this]

[akpm@linux-foundation.org: enhance the comment describing the reasons for using aligned_u64.  Via Andreas and Andi.]
Based-on-patch-by: Andreas Gruenbacher <agruen@suse.de>
Signed-off-by: Eric Paris <eparis@redhat.com>
Cc: Jan Engelhardt <jengelh@medozas.de>
Cc: David Miller <davem@davemloft.net>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric Paris 2010-10-15 14:34:14 -07:00 committed by Linus Torvalds
parent e3c6cf6181
commit 79b5dc0c64
1 changed files with 14 additions and 1 deletions
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15
include/linux/types.h
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@ -121,7 +121,15 @@ typedef __u64 u_int64_t;
typedef __s64 int64_t;
#endif
/* this is a special 64bit data type that is 8-byte aligned */
/*
* aligned_u64 should be used in defining kernel<->userspace ABIs to avoid
* common 32/64-bit compat problems.
* 64-bit values align to 4-byte boundaries on x86_32 (and possibly other
* architectures) and to 8-byte boundaries on 64-bit architetures. The new
* aligned_64 type enforces 8-byte alignment so that structs containing
* aligned_64 values have the same alignment on 32-bit and 64-bit architectures.
* No conversions are necessary between 32-bit user-space and a 64-bit kernel.
*/
#define aligned_u64 __u64 __attribute__((aligned(8)))
#define aligned_be64 __be64 __attribute__((aligned(8)))
#define aligned_le64 __le64 __attribute__((aligned(8)))
@ -178,6 +186,11 @@ 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;