[MIPS] Use SYSVIPC_COMPAT to fix various problems on N32

N32 SysV IPC system calls should use 32-bit compatible code.
arch/mips/kernel/linux32.c have similar compatible code for O32, but
ipc/compat.c seems more complete.  We can use it for both N32 and O32.

This patch should fix these problems (and other possible problems):

http://www.linux-mips.org/cgi-bin/mesg.cgi?a=linux-mips&i=1149188824.6986.6.camel%40diimka-laptop
http://www.linux-mips.org/cgi-bin/mesg.cgi?a=linux-mips&i=44C6B829.8050508%40caviumnetworks.comSigned-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

@@ -1940,6 +1940,11 @@ config COMPAT
 	depends on MIPS32_COMPAT
 	default y
 
+config SYSVIPC_COMPAT
+	bool
+	depends on COMPAT && SYSVIPC
+	default y
+
 config MIPS32_O32
 	bool "Kernel support for o32 binaries"
 	depends on MIPS32_COMPAT

arch/mips/kernel/scall64-n32.S

@@ -149,8 +149,8 @@ EXPORT(sysn32_call_table)
 	PTR	sys_mincore
 	PTR	sys_madvise
 	PTR	sys_shmget
-	PTR	sys32_shmat
-	PTR	sys_shmctl			/* 6030 */
+	PTR	sys_shmat
+	PTR	compat_sys_shmctl			/* 6030 */
 	PTR	sys_dup
 	PTR	sys_dup2
 	PTR	sys_pause
@@ -184,12 +184,12 @@ EXPORT(sysn32_call_table)
 	PTR	sys32_newuname
 	PTR	sys_semget
 	PTR	sys_semop
-	PTR	sys_semctl
+	PTR	sysn32_semctl
 	PTR	sys_shmdt			/* 6065 */
 	PTR	sys_msgget
-	PTR	sys_msgsnd
-	PTR	sys_msgrcv
-	PTR	sys_msgctl
+	PTR	compat_sys_msgsnd
+	PTR	compat_sys_msgrcv
+	PTR	compat_sys_msgctl
 	PTR	compat_sys_fcntl		/* 6070 */
 	PTR	sys_flock
 	PTR	sys_fsync
@@ -335,7 +335,7 @@ EXPORT(sysn32_call_table)
 	PTR	compat_sys_fcntl64
 	PTR	sys_set_tid_address
 	PTR	sys_restart_syscall
-	PTR	sys_semtimedop			/* 6215 */
+	PTR	compat_sys_semtimedop			/* 6215 */
 	PTR	sys_fadvise64_64
 	PTR	compat_sys_statfs64
 	PTR	compat_sys_fstatfs64

include/asm-mips/compat.h

@@ -32,6 +32,7 @@ typedef struct {
 	s32	val[2];
 } compat_fsid_t;
 typedef s32		compat_timer_t;
+typedef s32		compat_key_t;
 
 typedef s32		compat_int_t;
 typedef s32		compat_long_t;
@@ -146,4 +147,71 @@ static inline void __user *compat_alloc_user_space(long len)
 	return (void __user *) (regs->regs[29] - len);
 }
 
+struct compat_ipc64_perm {
+	compat_key_t key;
+	__compat_uid32_t uid;
+	__compat_gid32_t gid;
+	__compat_uid32_t cuid;
+	__compat_gid32_t cgid;
+	compat_mode_t mode;
+	unsigned short seq;
+	unsigned short __pad2;
+	compat_ulong_t __unused1;
+	compat_ulong_t __unused2;
+};
+
+struct compat_semid64_ds {
+	struct compat_ipc64_perm sem_perm;
+	compat_time_t	sem_otime;
+	compat_time_t	sem_ctime;
+	compat_ulong_t	sem_nsems;
+	compat_ulong_t	__unused1;
+	compat_ulong_t	__unused2;
+};
+
+struct compat_msqid64_ds {
+	struct compat_ipc64_perm msg_perm;
+#ifndef CONFIG_CPU_LITTLE_ENDIAN
+	compat_ulong_t	__unused1;
+#endif
+	compat_time_t	msg_stime;
+#ifdef CONFIG_CPU_LITTLE_ENDIAN
+	compat_ulong_t	__unused1;
+#endif
+#ifndef CONFIG_CPU_LITTLE_ENDIAN
+	compat_ulong_t	__unused2;
+#endif
+	compat_time_t	msg_rtime;
+#ifdef CONFIG_CPU_LITTLE_ENDIAN
+	compat_ulong_t	__unused2;
+#endif
+#ifndef CONFIG_CPU_LITTLE_ENDIAN
+	compat_ulong_t	__unused3;
+#endif
+	compat_time_t	msg_ctime;
+#ifdef CONFIG_CPU_LITTLE_ENDIAN
+	compat_ulong_t	__unused3;
+#endif
+	compat_ulong_t	msg_cbytes;
+	compat_ulong_t	msg_qnum;
+	compat_ulong_t	msg_qbytes;
+	compat_pid_t	msg_lspid;
+	compat_pid_t	msg_lrpid;
+	compat_ulong_t	__unused4;
+	compat_ulong_t	__unused5;
+};
+
+struct compat_shmid64_ds {
+	struct compat_ipc64_perm shm_perm;
+	compat_size_t	shm_segsz;
+	compat_time_t	shm_atime;
+	compat_time_t	shm_dtime;
+	compat_time_t	shm_ctime;
+	compat_pid_t	shm_cpid;
+	compat_pid_t	shm_lpid;
+	compat_ulong_t	shm_nattch;
+	compat_ulong_t	__unused1;
+	compat_ulong_t	__unused2;
+};
+
 #endif /* _ASM_COMPAT_H */