linux-kernel - [PATCH] scripts/gdb: fix python 3.8 SyntaxWarning

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Message-Id: <20200805225015.2847624-1-ndesaulniers@google.com>
Date:   Wed,  5 Aug 2020 15:50:14 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        Kieran Bingham <kbingham@...nel.org>
Cc:     Aymeric Agon-Rambosson <aymeric.agon@...dex.com>,
        Stephen Boyd <swboyd@...omium.org>,
        linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: [PATCH] scripts/gdb: fix python 3.8 SyntaxWarning

Fixes the observed warnings:
scripts/gdb/linux/rbtree.py:20: SyntaxWarning: "is" with a literal. Did
you mean "=="?
  if node is 0:
scripts/gdb/linux/rbtree.py:36: SyntaxWarning: "is" with a literal. Did
you mean "=="?
  if node is 0:

It looks like this is a new warning added in Python 3.8. I've only seen
this once after adding the add-auto-load-safe-path rule to my ~/.gdbinit
for a new tree.

Cc: Stephen Boyd <swboyd@...omium.org>
Fixes: commit 449ca0c95ea2 ("scripts/gdb: add rb tree iterating utilities")
Link: https://adamj.eu/tech/2020/01/21/why-does-python-3-8-syntaxwarning-for-is-literal/
Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
---
 scripts/gdb/linux/rbtree.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/scripts/gdb/linux/rbtree.py b/scripts/gdb/linux/rbtree.py
index c4b991607917..fe462855eefd 100644
--- a/scripts/gdb/linux/rbtree.py
+++ b/scripts/gdb/linux/rbtree.py
@@ -17,7 +17,7 @@ def rb_first(root):
         raise gdb.GdbError("Must be struct rb_root not {}".format(root.type))
 
     node = root['rb_node']
-    if node is 0:
+    if node == 0:
         return None
 
     while node['rb_left']:
@@ -33,7 +33,7 @@ def rb_last(root):
         raise gdb.GdbError("Must be struct rb_root not {}".format(root.type))
 
     node = root['rb_node']
-    if node is 0:
+    if node == 0:
         return None
 
     while node['rb_right']:
-- 
2.28.0.163.g6104cc2f0b6-goog