mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-22 10:31:08 +00:00
2a45a08a5b
The structure came originally from x86_32 but is used by most of the architectures now. Update the comment which says it is for x86 only. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/r/64efe033394b6f0dfef043a63fd8897a81ba6d16.1589970173.git.viresh.kumar@linaro.org'
45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
|
|
#ifndef __ASM_GENERIC_SEMBUF_H
|
|
#define __ASM_GENERIC_SEMBUF_H
|
|
|
|
#include <asm/bitsperlong.h>
|
|
#include <asm/ipcbuf.h>
|
|
|
|
/*
|
|
* The semid64_ds structure for most architectures (though it came from x86_32
|
|
* originally). Note extra padding because this structure is passed back and
|
|
* forth between kernel and user space.
|
|
*
|
|
* semid64_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 use a 64-bit long time field here, while
|
|
* 32 bit architectures have a pair of unsigned long values.
|
|
*
|
|
* On big-endian systems, the padding is in the wrong place for
|
|
* historic reasons, so user space has to reconstruct a time_t
|
|
* value using
|
|
*
|
|
* user_semid_ds.sem_otime = kernel_semid64_ds.sem_otime +
|
|
* ((long long)kernel_semid64_ds.sem_otime_high << 32)
|
|
*
|
|
* Pad space is left for 2 miscellaneous 32-bit values
|
|
*/
|
|
struct semid64_ds {
|
|
struct ipc64_perm sem_perm; /* permissions .. see ipc.h */
|
|
#if __BITS_PER_LONG == 64
|
|
long sem_otime; /* last semop time */
|
|
long sem_ctime; /* last change time */
|
|
#else
|
|
unsigned long sem_otime; /* last semop time */
|
|
unsigned long sem_otime_high;
|
|
unsigned long sem_ctime; /* last change time */
|
|
unsigned long sem_ctime_high;
|
|
#endif
|
|
unsigned long sem_nsems; /* no. of semaphores in array */
|
|
unsigned long __unused3;
|
|
unsigned long __unused4;
|
|
};
|
|
|
|
#endif /* __ASM_GENERIC_SEMBUF_H */
|