diff --git a/include/uapi/asm-generic/msgbuf.h b/include/uapi/asm-generic/msgbuf.h
index fb306ebdb36f..9fe4881557cb 100644
--- a/include/uapi/asm-generic/msgbuf.h
+++ b/include/uapi/asm-generic/msgbuf.h
@@ -18,31 +18,30 @@
  * 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
  */
 
 struct msqid64_ds {
 	struct ipc64_perm msg_perm;
+#if __BITS_PER_LONG == 64
 	__kernel_time_t msg_stime;	/* last msgsnd time */
-#if __BITS_PER_LONG != 64
-	unsigned long	__unused1;
-#endif
 	__kernel_time_t msg_rtime;	/* last msgrcv time */
-#if __BITS_PER_LONG != 64
-	unsigned long	__unused2;
-#endif
 	__kernel_time_t msg_ctime;	/* last change time */
-#if __BITS_PER_LONG != 64
-	unsigned long	__unused3;
+#else
+	unsigned long	msg_stime;	/* last msgsnd time */
+	unsigned long	msg_stime_high;
+	unsigned long	msg_rtime;	/* last msgrcv time */
+	unsigned long	msg_rtime_high;
+	unsigned long	msg_ctime;	/* last change time */
+	unsigned long	msg_ctime_high;
 #endif
-	__kernel_ulong_t msg_cbytes;	/* current number of bytes on queue */
-	__kernel_ulong_t msg_qnum;	/* number of messages in queue */
-	__kernel_ulong_t msg_qbytes;	/* max number of bytes on queue */
+	unsigned long	msg_cbytes;	/* current number of bytes on queue */
+	unsigned long	msg_qnum;	/* number of messages in queue */
+	unsigned long	 msg_qbytes;	/* max number of bytes on queue */
 	__kernel_pid_t msg_lspid;	/* pid of last msgsnd */
 	__kernel_pid_t msg_lrpid;	/* last receive pid */
-	__kernel_ulong_t __unused4;
-	__kernel_ulong_t __unused5;
+	unsigned long	 __unused4;
+	unsigned long	 __unused5;
 };
 
 #endif /* __ASM_GENERIC_MSGBUF_H */
diff --git a/include/uapi/asm-generic/sembuf.h b/include/uapi/asm-generic/sembuf.h
index cbf9cfe977d6..0bae010f1b64 100644
--- a/include/uapi/asm-generic/sembuf.h
+++ b/include/uapi/asm-generic/sembuf.h
@@ -13,23 +13,29 @@
  * 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,
+ * 64 bit architectures use a 64-bit __kernel_time_t here, while
+ * 32 bit architectures have a pair of unsigned long values.
  * so they do not need the first two 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
+ * 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
 	__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;
+#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;
diff --git a/include/uapi/asm-generic/shmbuf.h b/include/uapi/asm-generic/shmbuf.h
index 2b6c3bb97f97..e504422fc501 100644
--- a/include/uapi/asm-generic/shmbuf.h
+++ b/include/uapi/asm-generic/shmbuf.h
@@ -19,42 +19,41 @@
  *
  *
  * Pad space is left for:
- * - 64-bit time_t to solve y2038 problem
  * - 2 miscellaneous 32-bit values
  */
 
 struct shmid64_ds {
 	struct ipc64_perm	shm_perm;	/* operation perms */
 	size_t			shm_segsz;	/* size of segment (bytes) */
+#if __BITS_PER_LONG == 64
 	__kernel_time_t		shm_atime;	/* last attach time */
-#if __BITS_PER_LONG != 64
-	unsigned long		__unused1;
-#endif
 	__kernel_time_t		shm_dtime;	/* last detach time */
-#if __BITS_PER_LONG != 64
-	unsigned long		__unused2;
-#endif
 	__kernel_time_t		shm_ctime;	/* last change time */
-#if __BITS_PER_LONG != 64
-	unsigned long		__unused3;
+#else
+	unsigned long		shm_atime;	/* last attach time */
+	unsigned long		shm_atime_high;
+	unsigned long		shm_dtime;	/* last detach time */
+	unsigned long		shm_dtime_high;
+	unsigned long		shm_ctime;	/* last change time */
+	unsigned long		shm_ctime_high;
 #endif
 	__kernel_pid_t		shm_cpid;	/* pid of creator */
 	__kernel_pid_t		shm_lpid;	/* pid of last operator */
-	__kernel_ulong_t	shm_nattch;	/* no. of current attaches */
-	__kernel_ulong_t	__unused4;
-	__kernel_ulong_t	__unused5;
+	unsigned long		shm_nattch;	/* no. of current attaches */
+	unsigned long		__unused4;
+	unsigned long		__unused5;
 };
 
 struct shminfo64 {
-	__kernel_ulong_t	shmmax;
-	__kernel_ulong_t	shmmin;
-	__kernel_ulong_t	shmmni;
-	__kernel_ulong_t	shmseg;
-	__kernel_ulong_t	shmall;
-	__kernel_ulong_t	__unused1;
-	__kernel_ulong_t	__unused2;
-	__kernel_ulong_t	__unused3;
-	__kernel_ulong_t	__unused4;
+	unsigned long		shmmax;
+	unsigned long		shmmin;
+	unsigned long		shmmni;
+	unsigned long		shmseg;
+	unsigned long		shmall;
+	unsigned long		__unused1;
+	unsigned long		__unused2;
+	unsigned long		__unused3;
+	unsigned long		__unused4;
 };
 
 #endif /* __ASM_GENERIC_SHMBUF_H */