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authorArnd Bergmann <arnd@arndb.de>2009-06-18 21:48:17 +0200
committerH. Peter Anvin <hpa@zytor.com>2009-06-18 23:39:47 +0200
commit7bfd124d6dae7d394e73753300594a81a022fe7d (patch)
treef6b82b71071a5dcda066f0c2b33739d06b8bab65 /arch/x86/include/asm/msgbuf.h
parentx86: add copies of some headers to convert to asm-generic (diff)
downloadlinux-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/msgbuf.h')
-rw-r--r--arch/x86/include/asm/msgbuf.h30
1 files changed, 19 insertions, 11 deletions
diff --git a/arch/x86/include/asm/msgbuf.h b/arch/x86/include/asm/msgbuf.h
index 7e4e9481f51c..aec850d9159e 100644
--- a/arch/x86/include/asm/msgbuf.h
+++ b/arch/x86/include/asm/msgbuf.h
@@ -1,30 +1,38 @@
-#ifndef _ASM_X86_MSGBUF_H
-#define _ASM_X86_MSGBUF_H
+#ifndef __ASM_GENERIC_MSGBUF_H
+#define __ASM_GENERIC_MSGBUF_H
+#include <asm/bitsperlong.h>
/*
- * The msqid64_ds structure for i386 architecture.
+ * generic msqid64_ds structure.
+ *
* Note extra padding because this structure is passed back and forth
* between kernel and user space.
*
- * Pad space on i386 is left for:
+ * msqid64_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 three 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 x8664 is left for:
- * - 2 miscellaneous 64-bit values
*/
+
struct msqid64_ds {
struct ipc64_perm msg_perm;
__kernel_time_t msg_stime; /* last msgsnd time */
-#ifdef __i386__
+#if __BITS_PER_LONG != 64
unsigned long __unused1;
#endif
__kernel_time_t msg_rtime; /* last msgrcv time */
-#ifdef __i386__
+#if __BITS_PER_LONG != 64
unsigned long __unused2;
#endif
__kernel_time_t msg_ctime; /* last change time */
-#ifdef __i386__
+#if __BITS_PER_LONG != 64
unsigned long __unused3;
#endif
unsigned long msg_cbytes; /* current number of bytes on queue */
@@ -36,4 +44,4 @@ struct msqid64_ds {
unsigned long __unused5;
};
-#endif /* _ASM_X86_MSGBUF_H */
+#endif /* __ASM_GENERIC_MSGBUF_H */