y2038: sparc: Extend sysvipc data structures

sparc, uses a nonstandard variation of the generic sysvipc
data structures, intended to have the padding moved around
so it can deal with big-endian 32-bit user space that has
64-bit time_t.

Unlike most architectures, sparc actually succeeded in
defining this right for big-endian CPUs, but as everyone else
got it wrong, we just use the same hack everywhere.

This takes just take the same approach here that we have for
the asm-generic headers and adds separate 32-bit fields for the
upper halves of the timestamps, to let libc deal with the mess
in user space.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/sparc/include/asm/compat.h

@@ -192,10 +192,10 @@ struct compat_ipc64_perm {
 
 struct compat_semid64_ds {
 	struct compat_ipc64_perm sem_perm;
-	unsigned int	__pad1;
-	compat_time_t	sem_otime;
-	unsigned int	__pad2;
-	compat_time_t	sem_ctime;
+	unsigned int	sem_otime_high;
+	unsigned int	sem_otime;
+	unsigned int	sem_ctime_high;
+	unsigned int	sem_ctime;
 	u32		sem_nsems;
 	u32		__unused1;
 	u32		__unused2;
@@ -203,12 +203,12 @@ struct compat_semid64_ds {
 
 struct compat_msqid64_ds {
 	struct compat_ipc64_perm msg_perm;
-	unsigned int	__pad1;
-	compat_time_t	msg_stime;
-	unsigned int	__pad2;
-	compat_time_t	msg_rtime;
-	unsigned int	__pad3;
-	compat_time_t	msg_ctime;
+	unsigned int	msg_stime_high;
+	unsigned int	msg_stime;
+	unsigned int	msg_rtime_high;
+	unsigned int	msg_rtime;
+	unsigned int	msg_ctime_high;
+	unsigned int	msg_ctime;
 	unsigned int	msg_cbytes;
 	unsigned int	msg_qnum;
 	unsigned int	msg_qbytes;
@@ -220,12 +220,12 @@ struct compat_msqid64_ds {
 
 struct compat_shmid64_ds {
 	struct compat_ipc64_perm shm_perm;
-	unsigned int	__pad1;
-	compat_time_t	shm_atime;
-	unsigned int	__pad2;
-	compat_time_t	shm_dtime;
-	unsigned int	__pad3;
-	compat_time_t	shm_ctime;
+	unsigned int	shm_atime_high;
+	unsigned int	shm_atime;
+	unsigned int	shm_dtime_high;
+	unsigned int	shm_dtime;
+	unsigned int	shm_ctime_high;
+	unsigned int	shm_ctime;
 	compat_size_t	shm_segsz;
 	compat_pid_t	shm_cpid;
 	compat_pid_t	shm_lpid;

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

@@ -8,25 +8,22 @@
  * between kernel and user space.
  *
  * Pad space is left for:
- * - 64-bit time_t to solve y2038 problem
  * - 2 miscellaneous 32-bit values
  */
-
-#if defined(__sparc__) && defined(__arch64__)
-# define PADDING(x)
-#else
-# define PADDING(x) unsigned int x;
-#endif
-
-
 struct msqid64_ds {
 	struct ipc64_perm msg_perm;
-	PADDING(__pad1)
+#if defined(__sparc__) && defined(__arch64__)
 	__kernel_time_t msg_stime;	/* last msgsnd time */
-	PADDING(__pad2)
 	__kernel_time_t msg_rtime;	/* last msgrcv time */
-	PADDING(__pad3)
 	__kernel_time_t msg_ctime;	/* last change time */
+#else
+	unsigned long msg_stime_high;
+	unsigned long msg_stime;	/* last msgsnd time */
+	unsigned long msg_rtime_high;
+	unsigned long msg_rtime;	/* last msgrcv time */
+	unsigned long msg_ctime_high;
+	unsigned long msg_ctime;	/* last change time */
+#endif
 	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 */
@@ -35,5 +32,4 @@ struct msqid64_ds {
 	unsigned long  __unused1;
 	unsigned long  __unused2;
 };
-#undef PADDING
 #endif /* _SPARC_MSGBUF_H */

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

@@ -8,25 +8,23 @@
  * between kernel and user space.
  *
  * Pad space is left for:
- * - 64-bit time_t to solve y2038 problem
  * - 2 miscellaneous 32-bit values
  */
-#if defined(__sparc__) && defined(__arch64__)
-# define PADDING(x)
-#else
-# define PADDING(x) unsigned int x;
-#endif
 
 struct semid64_ds {
 	struct ipc64_perm sem_perm;		/* permissions .. see ipc.h */
-	PADDING(__pad1)
+#if defined(__sparc__) && defined(__arch64__)
 	__kernel_time_t	sem_otime;		/* last semop time */
-	PADDING(__pad2)
 	__kernel_time_t	sem_ctime;		/* last change time */
+#else
+	unsigned long	sem_otime_high;
+	unsigned long	sem_otime;		/* last semop time */
+	unsigned long	sem_ctime_high;
+	unsigned long	sem_ctime;		/* last change time */
+#endif
 	unsigned long	sem_nsems;		/* no. of semaphores in array */
 	unsigned long	__unused1;
 	unsigned long	__unused2;
 };
-#undef PADDING
 
 #endif /* _SPARC64_SEMBUF_H */

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

@@ -8,24 +8,23 @@
  * between kernel and user space.
  *
  * Pad space is left for:
- * - 64-bit time_t to solve y2038 problem
  * - 2 miscellaneous 32-bit values
  */
 
-#if defined(__sparc__) && defined(__arch64__)
-# define PADDING(x)
-#else
-# define PADDING(x) unsigned int x;
-#endif
-
 struct shmid64_ds {
 	struct ipc64_perm	shm_perm;	/* operation perms */
-	PADDING(__pad1)
+#if defined(__sparc__) && defined(__arch64__)
 	__kernel_time_t		shm_atime;	/* last attach time */
-	PADDING(__pad2)
 	__kernel_time_t		shm_dtime;	/* last detach time */
-	PADDING(__pad3)
 	__kernel_time_t		shm_ctime;	/* last change time */
+#else
+	unsigned long		shm_atime_high;
+	unsigned long		shm_atime;	/* last attach time */
+	unsigned long		shm_dtime_high;
+	unsigned long		shm_dtime;	/* last detach time */
+	unsigned long		shm_ctime_high;
+	unsigned long		shm_ctime;	/* last change time */
+#endif
 	size_t			shm_segsz;	/* size of segment (bytes) */
 	__kernel_pid_t		shm_cpid;	/* pid of creator */
 	__kernel_pid_t		shm_lpid;	/* pid of last operator */
@@ -46,6 +45,4 @@ struct shminfo64 {
 	unsigned long	__unused4;
 };
 
-#undef PADDING
-
 #endif /* _SPARC_SHMBUF_H */