[patch 08/15] scripts/gdb: repair rb_first() and rb_last()

[Andrew Morton <akpm@linux-foundation.org>]

From: Aymeric Agon-Rambosson <aymeric.agon@yandex.com>
Subject: scripts/gdb: repair rb_first() and rb_last()

The current implementations of the rb_first() and rb_last() gdb functions
have a variable that references itself in its instanciation, which causes
the function to throw an error if a specific condition on the argument is
met.  The original author rather intended to reference the argument and
made a typo.  Referring the argument instead makes the function work as
intended.

Link: http://lkml.kernel.org/r/20200427051029.354840-1-aymeric.agon@yandex.com
Signed-off-by: Aymeric Agon-Rambosson <aymeric.agon@yandex.com>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Douglas Anderson <dianders@chromium.org>
Cc: Nikolay Borisov <n.borisov.lkml@gmail.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Jackie Liu <liuyun01@kylinos.cn>
Cc: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 scripts/gdb/linux/rbtree.py |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/scripts/gdb/linux/rbtree.py~scripts-gdb-repair-rb_first-and-rb_last
+++ a/scripts/gdb/linux/rbtree.py
@@ -12,7 +12,7 @@ rb_node_type = utils.CachedType("struct
 
 def rb_first(root):
     if root.type == rb_root_type.get_type():
-        node = node.address.cast(rb_root_type.get_type().pointer())
+        node = root.address.cast(rb_root_type.get_type().pointer())
     elif root.type != rb_root_type.get_type().pointer():
         raise gdb.GdbError("Must be struct rb_root not {}".format(root.type))
 
@@ -28,7 +28,7 @@ def rb_first(root):
 
 def rb_last(root):
     if root.type == rb_root_type.get_type():
-        node = node.address.cast(rb_root_type.get_type().pointer())
+        node = root.address.cast(rb_root_type.get_type().pointer())
     elif root.type != rb_root_type.get_type().pointer():
         raise gdb.GdbError("Must be struct rb_root not {}".format(root.type))
 
_