linux-kernel - [PATCH] scripts: use is None instead of == None

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Date:   Wed, 15 Jun 2022 22:22:20 -0700
From:   Elijah Conners <business@...jahpepe.com>
To:     "acme" <acme@...nel.org>
Cc:     "peterz" <peterz@...radead.org>, "mingo" <mingo@...hat.com>,
        "linux-perf-users" <linux-perf-users@...r.kernel.org>,
        "jolsa" <jolsa@...nel.org>, "markrutland" <mark.rutland@....com>,
        "alexandershishkin" <alexander.shishkin@...ux.intel.com>,
        "namhyung" <namhyung@...nel.org>,
        "linux-kernel" <linux-kernel@...r.kernel.org>
Subject: [PATCH] scripts: use is None instead of == None

In compaction-times.py, exported-sql-viewer.py, mem-phys-addr.py,
net_dropmonitor.py, kunit.py, and tdc.py, the None object is checked
against various variables using equality. This is 50% slower than using
an identity operator, since using equality invokes the __eq__ method.
Checking identity in this case is also much better form.

Signed-off-by: Elijah Conners <business@...jahpepe.com>
---
 tools/perf/scripts/python/compaction-times.py    | 2 +-
 tools/perf/scripts/python/exported-sql-viewer.py | 2 +-
 tools/perf/scripts/python/mem-phys-addr.py       | 2 +-
 tools/perf/scripts/python/net_dropmonitor.py     | 2 +-
 tools/testing/kunit/kunit.py                     | 2 +-
 tools/testing/selftests/tc-testing/tdc.py        | 2 +-
 6 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/tools/perf/scripts/python/compaction-times.py b/tools/perf/scripts/python/compaction-times.py
index 2560a042dc6f..790cc58214a9 100644
--- a/tools/perf/scripts/python/compaction-times.py
+++ b/tools/perf/scripts/python/compaction-times.py
@@ -31,7 +31,7 @@ class comm_filter:
 
     def filter(self, pid, comm):
         m = self.re.search(comm)
-        return m == None or m.group() == ""
+        return m is None or m.group() == ""
 
 class pid_filter:
     def __init__(self, low, high):
diff --git a/tools/perf/scripts/python/exported-sql-viewer.py b/tools/perf/scripts/python/exported-sql-viewer.py
index 13f2d8a81610..28b53739746f 100755
--- a/tools/perf/scripts/python/exported-sql-viewer.py
+++ b/tools/perf/scripts/python/exported-sql-viewer.py
@@ -452,7 +452,7 @@ class FindBar():
         index = self.textbox.currentIndex()
         data = self.textbox.itemData(index)
         # Store the pattern in the combo box to keep it with the text value
-        if data == None:
+        if data is None:
             self.textbox.setItemData(index, pattern)
         else:
             self.pattern.setChecked(data)
diff --git a/tools/perf/scripts/python/mem-phys-addr.py b/tools/perf/scripts/python/mem-phys-addr.py
index 1f332e72b9b0..5891a4df69aa 100644
--- a/tools/perf/scripts/python/mem-phys-addr.py
+++ b/tools/perf/scripts/python/mem-phys-addr.py
@@ -95,6 +95,6 @@ def process_event(param_dict):
     phys_addr  = sample["phys_addr"]
 
     global event_name
-    if event_name == None:
+    if event_name is None:
         event_name = name
     load_mem_type_cnt[find_memory_type(phys_addr)] += 1
diff --git a/tools/perf/scripts/python/net_dropmonitor.py b/tools/perf/scripts/python/net_dropmonitor.py
index 101059971738..cd9488f11e03 100755
--- a/tools/perf/scripts/python/net_dropmonitor.py
+++ b/tools/perf/scripts/python/net_dropmonitor.py
@@ -55,7 +55,7 @@ def print_drop_table():
     print("%25s %25s %25s" % ("LOCATION", "OFFSET", "COUNT"))
     for i in drop_log.keys():
         (sym, off) = get_sym(i)
-        if sym == None:
+        if sym is None:
             sym = i
         print("%25s %25s %25s" % (sym, off, drop_log[i]))
 
diff --git a/tools/testing/kunit/kunit.py b/tools/testing/kunit/kunit.py
index 9274c6355809..6195e091d22d 100755
--- a/tools/testing/kunit/kunit.py
+++ b/tools/testing/kunit/kunit.py
@@ -496,7 +496,7 @@ def main(argv, linux=None):
         if result.status != KunitStatus.SUCCESS:
             sys.exit(1)
     elif cli_args.subcommand == 'parse':
-        if cli_args.file == None:
+        if cli_args.file is None:
             sys.stdin.reconfigure(errors='backslashreplace')  # pytype: disable=attribute-error
             kunit_output = sys.stdin
         else:
diff --git a/tools/testing/selftests/tc-testing/tdc.py b/tools/testing/selftests/tc-testing/tdc.py
index ee22e3447ec7..f1840023283a 100755
--- a/tools/testing/selftests/tc-testing/tdc.py
+++ b/tools/testing/selftests/tc-testing/tdc.py
@@ -355,7 +355,7 @@ def test_runner(pm, args, filtered_tests):
         print('give test rig 2 seconds to stabilize')
     time.sleep(2)
     for tidx in testlist:
-        if "flower" in tidx["category"] and args.device == None:
+        if "flower" in tidx["category"] and args.device is None:
             errmsg = "Tests using the DEV2 variable must define the name of a "
             errmsg += "physical NIC with the -d option when running tdc.\n"
             errmsg += "Test has been skipped."
--
2.25.1