[for-next][PATCH 01/13] ftrace: Have function graph tracer use global_ops for filtering

Steven Rostedt
2014-05-12T15:12:09Z

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From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>

Commit 4104d326b670 "ftrace: Remove global function list and call
function directly" cleaned up the global_ops filtering and made
the code simpler. But it left out function graph filtering which
also depended on that code. The function graph filtering still
needs to use global_ops as the filter otherwise it wont filter
at all.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
kernel/trace/ftrace.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 34b098bf..9eb1aa0 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -5008,12 +5008,6 @@ ftrace_suspend_notifier_call(struct notifier_block *bl, unsigned long state,
return NOTIFY_DONE;
}

-/* Just a place holder for function graph */
-static struct ftrace_ops fgraph_ops __read_mostly = {
- .func = ftrace_stub,
- .flags = FTRACE_OPS_FL_STUB | FTRACE_OPS_FL_RECURSION_SAFE,
-};
-
static int ftrace_graph_entry_test(struct ftrace_graph_ent *trace)
{
if (!ftrace_ops_test(&global_ops, trace->func, NULL))
@@ -5076,7 +5070,10 @@ int register_ftrace_graph(trace_func_graph_ret_t retfunc,
ftrace_graph_entry = ftrace_graph_entry_test;
update_function_graph_func();

- ret = ftrace_startup(&fgraph_ops, FTRACE_START_FUNC_RET);
+ /* Function graph doesn't use the .func field of global_ops */
+ global_ops.flags |= FTRACE_OPS_FL_STUB;
+
+ ret = ftrace_startup(&global_ops, FTRACE_START_FUNC_RET);

out:
mutex_unlock(&ftrace_lock);
@@ -5094,7 +5091,8 @@ void unregister_ftrace_graph(void)
ftrace_graph_return = (trace_func_graph_ret_t)ftrace_stub;
ftrace_graph_entry = ftrace_graph_entry_stub;
__ftrace_graph_entry = ftrace_graph_entry_stub;
- ftrace_shutdown(&fgraph_ops, FTRACE_STOP_FUNC_RET);
+ ftrace_shutdown(&global_ops, FTRACE_STOP_FUNC_RET);
+ global_ops.flags &= ~FTRACE_OPS_FL_STUB;
unregister_pm_notifier(&ftrace_suspend_notifier);
unregister_trace_sched_switch(ftrace_graph_probe_sched_switch, NULL);

--
1.8.5.3