int
trace_selftest_startup_function_graph(struct tracer *trace,
struct trace_array *tr)
{
int ret;
unsigned long count;
/*
*/
tracing_reset_online_cpus(tr);
set_graph_array(tr);
ret = register_ftrace_graph(&trace_graph_return,
&trace_graph_entry_watchdog);
if (ret) {
warn_failed_init_tracer(trace, ret);
goto out;
}
tracing_start_cmdline_record();
/* */
msleep(100);
/* */
if (graph_hang_thresh > GRAPH_MAX_FUNC_TEST) {
tracing_selftest_disabled = true;
ret = -1;
goto out;
}
tracing_stop();
/* */
ret = trace_test_buffer(tr, &count);
trace->reset(tr);
tracing_start();
if (!ret && !count) {
printk(KERN_CONT ".. no entries found ..");
ret = -1;
goto out;
}
/* */
out:
/* */
if (ret)
ftrace_graph_stop();
return ret;
}
/*
* Pretty much the same than for the function tracer from which the selftest
* has been borrowed.
*/
int
trace_selftest_startup_function_graph(struct tracer *trace,
struct trace_array *tr)
{
int ret;
unsigned long count;
/*
* Simulate the init() callback but we attach a watchdog callback
* to detect and recover from possible hangs
*/
tracing_reset_online_cpus(tr);
ret = register_ftrace_graph(&trace_graph_return,
&trace_graph_entry_watchdog);
if (ret) {
warn_failed_init_tracer(trace, ret);
goto out;
}
tracing_start_cmdline_record();
/* Sleep for a 1/10 of a second */
msleep(100);
/* Have we just recovered from a hang? */
if (graph_hang_thresh > GRAPH_MAX_FUNC_TEST) {
tracing_selftest_disabled = true;
ret = -1;
goto out;
}
tracing_stop();
/* check the trace buffer */
ret = trace_test_buffer(tr, &count);
trace->reset(tr);
tracing_start();
if (!ret && !count) {
printk(KERN_CONT ".. no entries found ..");
ret = -1;
goto out;
}
/* Don't test dynamic tracing, the function tracer already did */
out:
/* Stop it if we failed */
if (ret)
ftrace_graph_stop();
return ret;
}