From e53a6319cca69111c1643dc9f18f4465d7f1cbf0 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 26 Nov 2008 00:16:25 -0500 Subject: [PATCH] ftrace: let function tracing and function return run together Impact: feature This patch enables function tracing and function return to run together. I've tested this by enabling the stack tracer and return tracer, where both the function entry and function return are used together with dynamic ftrace. Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar --- kernel/trace/ftrace.c | 22 ++-------------------- 1 file changed, 2 insertions(+), 20 deletions(-) diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 5f7c8642d58b..cbf8b09f63a5 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -53,9 +53,6 @@ static int ftrace_pid_trace = -1; /* Quick disabling of function tracer. */ int function_trace_stop; -/* By default, current tracing type is normal tracing. */ -enum ftrace_tracing_type_t ftrace_tracing_type = FTRACE_TYPE_ENTER; - /* * ftrace_disabled is set when an anomaly is discovered. * ftrace_disabled is much stronger than ftrace_enabled. @@ -1576,15 +1573,9 @@ int register_ftrace_function(struct ftrace_ops *ops) mutex_lock(&ftrace_sysctl_lock); - if (ftrace_tracing_type == FTRACE_TYPE_RETURN) { - ret = -EBUSY; - goto out; - } - ret = __register_ftrace_function(ops); ftrace_startup(0); -out: mutex_unlock(&ftrace_sysctl_lock); return ret; } @@ -1731,23 +1722,16 @@ int register_ftrace_graph(trace_func_graph_ret_t retfunc, mutex_lock(&ftrace_sysctl_lock); - /* - * Don't launch return tracing if normal function - * tracing is already running. - */ - if (ftrace_trace_function != ftrace_stub) { - ret = -EBUSY; - goto out; - } atomic_inc(&ftrace_graph_active); ret = start_graph_tracing(); if (ret) { atomic_dec(&ftrace_graph_active); goto out; } - ftrace_tracing_type = FTRACE_TYPE_RETURN; + ftrace_graph_return = retfunc; ftrace_graph_entry = entryfunc; + ftrace_startup(FTRACE_START_FUNC_RET); out: @@ -1763,8 +1747,6 @@ void unregister_ftrace_graph(void) ftrace_graph_return = (trace_func_graph_ret_t)ftrace_stub; ftrace_graph_entry = (trace_func_graph_ent_t)ftrace_stub; ftrace_shutdown(FTRACE_STOP_FUNC_RET); - /* Restore normal tracing type */ - ftrace_tracing_type = FTRACE_TYPE_ENTER; mutex_unlock(&ftrace_sysctl_lock); }