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tracing/ftrace: fix the check of ftrace_trace_task 

Impact: fix default empty traces on function-graph-tracer

The actual ftrace_trace_task() checks if ftrace_pid_trace is allocated
and return 1 if it is true.
If it is NULL, it will check the bit of pid tracing flag for the current
task (which are not set by default).
So by default, a task is not traced.
Actually all tasks should be traced by default and filter_by_pid when
ftrace_pid_trace is allocated.

The appropriate condition should be to return 1 if filter_by_pid is
set.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acke-dby: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
5bit-waveforms
Frederic Weisbecker 2008-12-04 23:49:47 +01:00 committed by Ingo Molnar
parent ff32504fdc
commit 77d683f3e0
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/trace.h
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@ -551,7 +551,7 @@ extern struct pid *ftrace_pid_trace;
static inline int ftrace_trace_task(struct task_struct *task)
{
if (ftrace_pid_trace)
if (!ftrace_pid_trace)
return 1;
return test_tsk_trace_trace(task);