scripts/gdb: enable completion for lx-list-check parameter

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Cc: ThiƩbaud Weksteen <thiebaud@weksteen.fr>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/scripts/gdb/linux/lists.py b/scripts/gdb/linux/lists.py
index 71fba6a..3a3775b 100644
--- a/scripts/gdb/linux/lists.py
+++ b/scripts/gdb/linux/lists.py
@@ -80,7 +80,8 @@
     """Verify a list consistency"""
 
     def __init__(self):
-        super(LxListChk, self).__init__("lx-list-check", gdb.COMMAND_DATA)
+        super(LxListChk, self).__init__("lx-list-check", gdb.COMMAND_DATA,
+                                        gdb.COMPLETE_EXPRESSION)
 
     def invoke(self, arg, from_tty):
         argv = gdb.string_to_argv(arg)