diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2009-06-18 21:48:17 +0200 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-06-18 23:39:47 +0200 |
| commit | 7bfd124d6dae7d394e73753300594a81a022fe7d (patch) | |
| tree | f6b82b71071a5dcda066f0c2b33739d06b8bab65 /arch/x86/include/asm/shmbuf.h | |
| parent | x86: add copies of some headers to convert to asm-generic (diff) | |
| download | linux-7bfd124d6dae7d394e73753300594a81a022fe7d.tar.xz linux-7bfd124d6dae7d394e73753300594a81a022fe7d.zip | |
x86: convert trivial headers to asm-generic version
For these nine header files, the asm-generic version should
be semantically identical to what is in x86. Change the
contents to be binary identical, for better review.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
LKML-Reference: <cover.1245354003.git.arnd@arndb.de>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/include/asm/shmbuf.h')
| -rw-r--r-- | arch/x86/include/asm/shmbuf.h | 28 |
1 files changed, 18 insertions, 10 deletions
diff --git a/arch/x86/include/asm/shmbuf.h b/arch/x86/include/asm/shmbuf.h index b51413b74971..5768fa60ac82 100644 --- a/arch/x86/include/asm/shmbuf.h +++ b/arch/x86/include/asm/shmbuf.h @@ -1,32 +1,40 @@ -#ifndef _ASM_X86_SHMBUF_H -#define _ASM_X86_SHMBUF_H +#ifndef __ASM_GENERIC_SHMBUF_H +#define __ASM_GENERIC_SHMBUF_H + +#include <asm/bitsperlong.h> /* * The shmid64_ds structure for x86 architecture. * Note extra padding because this structure is passed back and forth * between kernel and user space. * - * Pad space on 32 bit is left for: + * shmid64_ds was originally meant to be architecture specific, but + * everyone just ended up making identical copies without specific + * optimizations, so we may just as well all use the same one. + * + * 64 bit architectures typically define a 64 bit __kernel_time_t, + * so they do not need the first two padding words. + * On big-endian systems, the padding is in the wrong place. + * + * + * Pad space is left for: * - 64-bit time_t to solve y2038 problem * - 2 miscellaneous 32-bit values - * - * Pad space on 64 bit is left for: - * - 2 miscellaneous 64-bit values */ struct shmid64_ds { struct ipc64_perm shm_perm; /* operation perms */ size_t shm_segsz; /* size of segment (bytes) */ __kernel_time_t shm_atime; /* last attach time */ -#ifdef __i386__ +#if __BITS_PER_LONG != 64 unsigned long __unused1; #endif __kernel_time_t shm_dtime; /* last detach time */ -#ifdef __i386__ +#if __BITS_PER_LONG != 64 unsigned long __unused2; #endif __kernel_time_t shm_ctime; /* last change time */ -#ifdef __i386__ +#if __BITS_PER_LONG != 64 unsigned long __unused3; #endif __kernel_pid_t shm_cpid; /* pid of creator */ @@ -48,4 +56,4 @@ struct shminfo64 { unsigned long __unused4; }; -#endif /* _ASM_X86_SHMBUF_H */ +#endif /* __ASM_GENERIC_SHMBUF_H */ |