y2038: s390: Remove unneeded ipc uapi header files

The s390 msgbuf/sembuf/shmbuf header files are all identical to the
version from asm-generic.

This patch removes the files and replaces them with 'generic-y'
statements, to avoid having to modify each copy when we extend sysvipc
to deal with 64-bit time_t in 32-bit user space.

Note that unlike alpha and ia64, the ipcbuf.h header file is slightly
different here, so I'm leaving the private copy.

To deal with 32-bit compat tasks, we also have to adapt the definitions
of compat_{shm,sem,msg}id_ds to match the changes to the respective
asm-generic files.
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/s390/include/asm/compat.h

@@ -232,10 +232,10 @@ struct compat_ipc64_perm {
 
 struct compat_semid64_ds {
 	struct compat_ipc64_perm sem_perm;
-	compat_time_t  sem_otime;
-	compat_ulong_t __pad1;
-	compat_time_t  sem_ctime;
-	compat_ulong_t __pad2;
+	compat_ulong_t sem_otime;
+	compat_ulong_t sem_otime_high;
+	compat_ulong_t sem_ctime;
+	compat_ulong_t sem_ctime_high;
 	compat_ulong_t sem_nsems;
 	compat_ulong_t __unused1;
 	compat_ulong_t __unused2;
@@ -243,12 +243,12 @@ struct compat_semid64_ds {
 
 struct compat_msqid64_ds {
 	struct compat_ipc64_perm msg_perm;
-	compat_time_t   msg_stime;
-	compat_ulong_t __pad1;
-	compat_time_t   msg_rtime;
-	compat_ulong_t __pad2;
-	compat_time_t   msg_ctime;
-	compat_ulong_t __pad3;
+	compat_ulong_t msg_stime;
+	compat_ulong_t msg_stime_high;
+	compat_ulong_t msg_rtime;
+	compat_ulong_t msg_rtime_high;
+	compat_ulong_t msg_ctime;
+	compat_ulong_t msg_ctime_high;
 	compat_ulong_t msg_cbytes;
 	compat_ulong_t msg_qnum;
 	compat_ulong_t msg_qbytes;
@@ -261,12 +261,12 @@ struct compat_msqid64_ds {
 struct compat_shmid64_ds {
 	struct compat_ipc64_perm shm_perm;
 	compat_size_t  shm_segsz;
-	compat_time_t  shm_atime;
-	compat_ulong_t __pad1;
-	compat_time_t  shm_dtime;
-	compat_ulong_t __pad2;
-	compat_time_t  shm_ctime;
-	compat_ulong_t __pad3;
+	compat_ulong_t shm_atime;
+	compat_ulong_t shm_atime_high;
+	compat_ulong_t shm_dtime;
+	compat_ulong_t shm_dtime_high;
+	compat_ulong_t shm_ctime;
+	compat_ulong_t shm_ctime_high;
 	compat_pid_t   shm_cpid;
 	compat_pid_t   shm_lpid;
 	compat_ulong_t shm_nattch;

arch/s390/include/uapi/asm/Kbuild

@@ -9,9 +9,12 @@ generic-y += errno.h
 generic-y += fcntl.h
 generic-y += ioctl.h
 generic-y += mman.h
+generic-y += msgbuf.h
 generic-y += param.h
 generic-y += poll.h
 generic-y += resource.h
+generic-y += sembuf.h
+generic-y += shmbuf.h
 generic-y += sockios.h
 generic-y += swab.h
 generic-y += termbits.h

arch/s390/include/uapi/asm/msgbuf.h

-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-#ifndef _S390_MSGBUF_H
-#define _S390_MSGBUF_H
-
-/* 
- * The msqid64_ds structure for S/390 architecture.
- * Note extra padding because this structure is passed back and forth
- * between kernel and user space.
- *
- * 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;
-	__kernel_time_t msg_stime;	/* last msgsnd time */
-#ifndef __s390x__
-	unsigned long	__unused1;
-#endif /* ! __s390x__ */
-	__kernel_time_t msg_rtime;	/* last msgrcv time */
-#ifndef __s390x__
-	unsigned long	__unused2;
-#endif /* ! __s390x__ */
-	__kernel_time_t msg_ctime;	/* last change time */
-#ifndef __s390x__
-	unsigned long	__unused3;
-#endif /* ! __s390x__ */
-	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 */
-	unsigned long  __unused4;
-	unsigned long  __unused5;
-};
-
-#endif /* _S390_MSGBUF_H */

arch/s390/include/uapi/asm/sembuf.h

-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-#ifndef _S390_SEMBUF_H
-#define _S390_SEMBUF_H
-
-/* 
- * The semid64_ds structure for S/390 architecture.
- * Note extra padding because this structure is passed back and forth
- * between kernel and user space.
- *
- * Pad space is left for:
- * - 64-bit time_t to solve y2038 problem (for !__s390x__)
- * - 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 */
-#ifndef __s390x__
-	unsigned long	__unused1;
-#endif /* ! __s390x__ */
-	__kernel_time_t	sem_ctime;		/* last change time */
-#ifndef __s390x__
-	unsigned long	__unused2;
-#endif /* ! __s390x__ */
-	unsigned long	sem_nsems;		/* no. of semaphores in array */
-	unsigned long	__unused3;
-	unsigned long	__unused4;
-};
-
-#endif /* _S390_SEMBUF_H */

arch/s390/include/uapi/asm/shmbuf.h

-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-#ifndef _S390_SHMBUF_H
-#define _S390_SHMBUF_H
-
-/* 
- * The shmid64_ds structure for S/390 architecture.
- * Note extra padding because this structure is passed back and forth
- * between kernel and user space.
- *
- * Pad space is left for:
- * - 64-bit time_t to solve y2038 problem (for !__s390x__)
- * - 2 miscellaneous 32-bit values
- */
-
-struct shmid64_ds {
-	struct ipc64_perm	shm_perm;	/* operation perms */
-	size_t			shm_segsz;	/* size of segment (bytes) */
-	__kernel_time_t		shm_atime;	/* last attach time */
-#ifndef __s390x__
-	unsigned long		__unused1;
-#endif /* ! __s390x__ */
-	__kernel_time_t		shm_dtime;	/* last detach time */
-#ifndef __s390x__
-	unsigned long		__unused2;
-#endif /* ! __s390x__ */
-	__kernel_time_t		shm_ctime;	/* last change time */
-#ifndef __s390x__
-	unsigned long		__unused3;
-#endif /* ! __s390x__ */
-	__kernel_pid_t		shm_cpid;	/* pid of creator */
-	__kernel_pid_t		shm_lpid;	/* pid of last operator */
-	unsigned long		shm_nattch;	/* no. of current attaches */
-	unsigned long		__unused4;
-	unsigned long		__unused5;
-};
-
-struct shminfo64 {
-	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 /* _S390_SHMBUF_H */