ns proc: Add support for the ipc namespace

Acked-by: Daniel Lezcano <daniel.lezcano@free.fr>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h
index 52aa89d..a23f0b7 100644
--- a/include/linux/proc_fs.h
+++ b/include/linux/proc_fs.h
@@ -267,6 +267,7 @@
 };
 extern const struct proc_ns_operations netns_operations;
 extern const struct proc_ns_operations utsns_operations;
+extern const struct proc_ns_operations ipcns_operations;
 
 union proc_op {
 	int (*proc_get_link)(struct inode *, struct path *);