[PATCH 3.17 054/141] xtensa: re-wire umount syscall to sys_oldumount

[Greg Kroah-Hartman]

3.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Max Filippov <jcmvbkbc@xxxxxxxxx>

commit 2651cc6974d47fc43bef1cd8cd26966e4f5ba306 upstream.

Userspace actually passes single parameter (path name) to the umount
syscall, so new umount just fails. Fix it by requesting old umount
syscall implementation and re-wiring umount to it.

Signed-off-by: Max Filippov <jcmvbkbc@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/xtensa/include/uapi/asm/unistd.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/xtensa/include/uapi/asm/unistd.h
+++ b/arch/xtensa/include/uapi/asm/unistd.h
@@ -384,7 +384,8 @@ __SYSCALL(174, sys_chroot, 1)
 #define __NR_pivot_root 			175
 __SYSCALL(175, sys_pivot_root, 2)
 #define __NR_umount 				176
-__SYSCALL(176, sys_umount, 2)
+__SYSCALL(176, sys_oldumount, 1)
+#define __ARCH_WANT_SYS_OLDUMOUNT
 #define __NR_swapoff 				177
 __SYSCALL(177, sys_swapoff, 1)
 #define __NR_sync 				178


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