diff options
Diffstat (limited to 'include/uapi/asm-generic/sembuf.h')
| -rw-r--r-- | include/uapi/asm-generic/sembuf.h | 39 |
1 files changed, 23 insertions, 16 deletions
diff --git a/include/uapi/asm-generic/sembuf.h b/include/uapi/asm-generic/sembuf.h index 4cb2c13e5090..f54e48fc91ae 100644 --- a/include/uapi/asm-generic/sembuf.h +++ b/include/uapi/asm-generic/sembuf.h @@ -1,34 +1,41 @@ +/* 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 x86 architecture. - * Note extra padding because this structure is passed back and forth - * between kernel and user space. + * 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 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. + * 64 bit architectures use a 64-bit long time field here, while + * 32 bit architectures have a pair of unsigned long values. * - * Pad space is left for: - * - 64-bit time_t to solve y2038 problem - * - 2 miscellaneous 32-bit 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 */ - __kernel_time_t sem_otime; /* last semop time */ -#if __BITS_PER_LONG != 64 - unsigned long __unused1; -#endif - __kernel_time_t sem_ctime; /* last change time */ -#if __BITS_PER_LONG != 64 - unsigned long __unused2; +#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; |