tests: Add printk tracer to trace-cmd

Signed-off-by: Eliad Peller <eliadx.peller@intel.com>

tests/hwsim/run-tests.py

@@ -124,7 +124,7 @@ class DataCollector(object):
     def __enter__(self):
         if self._tracing:
             output = os.path.abspath(os.path.join(self._logdir, '%s.dat' % (self._testname, )))
-            self._trace_cmd = subprocess.Popen(['sudo', 'trace-cmd', 'record', '-o', output, '-e', 'mac80211', '-e', 'cfg80211', 'sh', '-c', 'echo STARTED ; read l'],
+            self._trace_cmd = subprocess.Popen(['sudo', 'trace-cmd', 'record', '-o', output, '-e', 'mac80211', '-e', 'cfg80211', '-e', 'printk', 'sh', '-c', 'echo STARTED ; read l'],
                                                stdin=subprocess.PIPE,
                                                stdout=subprocess.PIPE,
                                                stderr=open('/dev/null', 'w'),