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ftrace: Do not run selftest if command line parameter is set

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If the kernel command line ftrace filter parameters are set
(ftrace_filter or ftrace_notrace), force the function self test to
pass, with a warning why it was forced.

If the user adds a filter to the kernel command line, it is assumed
that they know what they are doing, and the self test should just not
run instead of failing (which disables function tracing) or clearing
the filter, as that will probably annoy the user.

If the user wants the selftest to run, the message will tell them why
it did not.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat)
2013-06-27 22:18:06 -04:00
committed by Steven Rostedt
parent cf6735a4b1
commit f1ed7c741f
3 changed files with 22 additions and 2 deletions
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1
kernel/trace/trace.h
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@ -776,6 +776,7 @@ print_graph_function_flags(struct trace_iterator *iter, u32 flags)
extern struct list_head ftrace_pids;
#ifdef CONFIG_FUNCTION_TRACER
extern bool ftrace_filter_param __initdata;
static inline int ftrace_trace_task(struct task_struct *task)
{
if (list_empty(&ftrace_pids))