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trace/ftrace: Only require CONFIG_FUNCTION_PROFILER for the function profiling

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We currently raise an exception when trying to use the 'function' or
'function_graph' tracer if the kernel wasn't compiled
CONFIG_FUNCTION_PROFILER, but that is a completely valid use.
This commit is contained in:
Valentin Schneider 2019-11-26 17:43:18 +00:00 committed by Marc Bonnici
parent 745dc9499a
commit 72be3d01f8
1 changed files with 4 additions and 3 deletions
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7
devlib/trace/ftrace.py
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@ -161,9 +161,6 @@ class FtraceCollector(TraceCollector):
# Check for function tracing support
if self.functions:
if not self.target.file_exists(self.function_profile_file):
raise TargetStableError('Function profiling not supported. '\
'A kernel build with CONFIG_FUNCTION_PROFILER enable is required')
# Validate required functions to be traced
available_functions = self.target.execute(
'cat {}'.format(self.available_functions_file),
@ -178,7 +175,11 @@ class FtraceCollector(TraceCollector):
else:
selected_functions.append(function)
# Function profiling
if self.tracer is None:
if not self.target.file_exists(self.function_profile_file):
raise TargetStableError('Function profiling not supported. '\
'A kernel build with CONFIG_FUNCTION_PROFILER enable is required')
self.function_string = _build_trace_functions(selected_functions)
# If function profiling is enabled we always need at least one event.
# Thus, if not other events have been specified, try to add at least