+ scripts-gdb-fix-python-38-syntaxwarning.patch added to -mm tree

+ scripts-gdb-fix-python-38-syntaxwarning.patch added to -mm tree

[akpm]

The patch titled
     Subject: scripts/gdb: fix python 3.8 SyntaxWarning
has been added to the -mm tree.  Its filename is
     scripts-gdb-fix-python-38-syntaxwarning.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/scripts-gdb-fix-python-38-syntaxwarning.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/scripts-gdb-fix-python-38-syntaxwarning.patch

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------------------------------------------------------
From: Nick Desaulniers <ndesaulniers@google.com>
Subject: 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.

Link: http://lkml.kernel.org/r/20200805225015.2847624-1-ndesaulniers@google.com
Cc: Stephen Boyd <swboyd@chromium.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@google.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Aymeric Agon-Rambosson <aymeric.agon@yandex.com>
Cc: Stephen Boyd <swboyd@chromium.org>
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-fix-python-38-syntaxwarning
+++ a/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']:
_

Patches currently in -mm which might be from ndesaulniers@google.com are

scripts-gdb-fix-python-38-syntaxwarning.patch