mips: fix n32 compat_ipc_parse_version

commit 5a9372f751b5350e0ce3d2ee91832f1feae2c2e5 upstream.

While reading through the sysvipc implementation, I noticed that the n32
semctl/shmctl/msgctl system calls behave differently based on whether
o32 support is enabled or not: Without o32, the IPC_64 flag passed by
user space is rejected but calls without that flag get IPC_64 behavior.

As far as I can tell, this was inadvertently changed by a cleanup patch
but never noticed by anyone, possibly nobody has tried using sysvipc
on n32 after linux-3.19.

Change it back to the old behavior now.

Fixes: 78aaf956ba3a ("MIPS: Compat: Fix build error if CONFIG_MIPS32_COMPAT but no compat ABI.")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
Cc: stable@vger.kernel.org # 3.19+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 3551199..154b811 100644 (file)
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -3149,6 +3149,7 @@ config MIPS32_O32
 config MIPS32_N32
        bool "Kernel support for n32 binaries"
        depends on 64BIT
+       select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
        select COMPAT
        select MIPS32_COMPAT
        select SYSVIPC_COMPAT if SYSVIPC