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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'
46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef __ASM_GENERIC_SEMBUF_H
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#define __ASM_GENERIC_SEMBUF_H
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#include <asm/bitsperlong.h>
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#include <asm/ipcbuf.h>
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/*
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* The semid64_ds structure for most architectures (though it came from x86_32
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* originally). Note extra padding because this structure is passed back and
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* forth between kernel and user space.
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*
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* semid64_ds was originally meant to be architecture specific, but
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* everyone just ended up making identical copies without specific
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* optimizations, so we may just as well all use the same one.
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*
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* 64 bit architectures use a 64-bit long time field here, while
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* 32 bit architectures have a pair of unsigned long values.
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*
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* On big-endian systems, the padding is in the wrong place for
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* historic reasons, so user space has to reconstruct a time_t
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* value using
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*
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* user_semid_ds.sem_otime = kernel_semid64_ds.sem_otime +
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* ((long long)kernel_semid64_ds.sem_otime_high << 32)
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*
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* Pad space is left for 2 miscellaneous 32-bit values
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*/
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struct semid64_ds {
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struct ipc64_perm sem_perm; /* permissions .. see ipc.h */
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#if __BITS_PER_LONG == 64
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long sem_otime; /* last semop time */
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long sem_ctime; /* last change time */
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#else
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unsigned long sem_otime; /* last semop time */
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unsigned long sem_otime_high;
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unsigned long sem_ctime; /* last change time */
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unsigned long sem_ctime_high;
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#endif
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unsigned long sem_nsems; /* no. of semaphores in array */
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unsigned long __unused3;
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unsigned long __unused4;
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};
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#endif /* __ASM_GENERIC_SEMBUF_H */
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