selftests: net: py: capitalize defer queue and improve import

Import utils and refer to the global defer queue that way instead
of importing the queue. This will make it possible to assign value
to the global variable. While at it capitalize the name, to comply
with the Python coding style.

Reviewed-by: Petr Machata <petrm@nvidia.com>
Link: https://patch.msgid.link/20260108225257.2684238-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/lib/py/ksft.py

@@ -8,7 +8,7 @@ import time
 import traceback
 from collections import namedtuple
 from .consts import KSFT_MAIN_NAME
-from .utils import global_defer_queue
+from . import utils
 
 KSFT_RESULT = None
 KSFT_RESULT_ALL = True
@@ -157,10 +157,10 @@ def ksft_flush_defer():
     global KSFT_RESULT
 
     i = 0
-    qlen_start = len(global_defer_queue)
-    while global_defer_queue:
+    qlen_start = len(utils.GLOBAL_DEFER_QUEUE)
+    while utils.GLOBAL_DEFER_QUEUE:
         i += 1
-        entry = global_defer_queue.pop()
+        entry = utils.GLOBAL_DEFER_QUEUE.pop()
         try:
             entry.exec_only()
         except Exception:

tools/testing/selftests/net/lib/py/utils.py

@@ -141,7 +141,7 @@ class bkg(cmd):
         return self.process(terminate=terminate, fail=self.check_fail)
 
 
-global_defer_queue = []
+GLOBAL_DEFER_QUEUE = []
 
 
 class defer:
@@ -153,7 +153,7 @@ class defer:
         self.args = args
         self.kwargs = kwargs
 
-        self._queue =  global_defer_queue
+        self._queue = GLOBAL_DEFER_QUEUE
         self._queue.append(self)
 
     def __enter__(self):