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3f3a4b3fbf
MIPS is the weirdest case for sysvipc, because each of the three data structures is done differently: * msqid64_ds has padding in the right place so we could in theory extend this one to just have 64-bit values instead of time_t. As this does not work for most of the other combinations, we just handle it in the common manner though. * semid64_ds has no padding for 64-bit time_t, but has two reserved 'long' fields, which are sufficient to extend the sem_otime and sem_ctime fields to 64 bit. In order to do this, the libc implementation will have to copy the data into another structure that has the fields in a different order. MIPS is the only architecture with this problem, so this is best done in MIPS specific libc code. * shmid64_ds is slightly worse than that, because it has three time_t fields but only two unused 32-bit words. As a workaround, we extend each field only by 16 bits, ending up with 48-bit timestamps that user space again has to work around by itself. The compat versions of the data structures are changed in the same way. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
35 lines
1.0 KiB
C
35 lines
1.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _ASM_SEMBUF_H
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#define _ASM_SEMBUF_H
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/*
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* The semid64_ds structure for the MIPS architecture.
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* Note extra padding because this structure is passed back and forth
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* between kernel and user space.
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*
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* Pad space is left for 2 miscellaneous 64-bit values on mips64,
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* but used for the upper 32 bit of the time values on mips32.
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*/
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#ifdef __mips64
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struct semid64_ds {
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struct ipc64_perm sem_perm; /* permissions .. see ipc.h */
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__kernel_time_t sem_otime; /* last semop time */
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__kernel_time_t sem_ctime; /* last change time */
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unsigned long sem_nsems; /* no. of semaphores in array */
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unsigned long __unused1;
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unsigned long __unused2;
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};
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#else
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struct semid64_ds {
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struct ipc64_perm sem_perm; /* permissions .. see ipc.h */
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unsigned long sem_otime; /* last semop time */
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unsigned long sem_ctime; /* last change time */
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unsigned long sem_nsems; /* no. of semaphores in array */
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unsigned long sem_otime_high;
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unsigned long sem_ctime_high;
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};
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#endif
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#endif /* _ASM_SEMBUF_H */
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