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ftrace: Consolidate updating of ftrace_trace_function 

There are three locations that perform almost identical functions in order
to update the ftrace_trace_function (the ftrace function variable that gets
called by mcount).

Consolidate these into a single function called update_ftrace_function().

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2011-04-27 21:43:36 -04:00 коммит произвёл Steven Rostedt
Родитель 996e87be7f
Коммит 491d0dcfb9
1 изменённых файлов: 34 добавлений и 61 удалений
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95
kernel/trace/ftrace.c
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@ -151,6 +151,34 @@ static void ftrace_test_stop_func(unsigned long ip, unsigned long parent_ip)
}
#endif
static void update_ftrace_function(void)
{
ftrace_func_t func;
/*
* If there's only one function registered, then call that
* function directly. Otherwise, we need to iterate over the
* registered callers.
*/
if (ftrace_list == &ftrace_list_end ||
ftrace_list->next == &ftrace_list_end)
func = ftrace_list->func;
else
func = ftrace_list_func;
/* If we filter on pids, update to use the pid function */
if (!list_empty(&ftrace_pids)) {
set_ftrace_pid_function(func);
func = ftrace_pid_func;
}
#ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
ftrace_trace_function = func;
#else
__ftrace_trace_function = func;
ftrace_trace_function = ftrace_test_stop_func;
#endif
}
static int __register_ftrace_function(struct ftrace_ops *ops)
{
ops->next = ftrace_list;
@ -162,30 +190,8 @@ static int __register_ftrace_function(struct ftrace_ops *ops)
*/
rcu_assign_pointer(ftrace_list, ops);
if (ftrace_enabled) {
ftrace_func_t func;
if (ops->next == &ftrace_list_end)
func = ops->func;
else
func = ftrace_list_func;
if (!list_empty(&ftrace_pids)) {
set_ftrace_pid_function(func);
func = ftrace_pid_func;
}
/*
* For one func, simply call it directly.
* For more than one func, call the chain.
*/
#ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
ftrace_trace_function = func;
#else
__ftrace_trace_function = func;
ftrace_trace_function = ftrace_test_stop_func;
#endif
}
if (ftrace_enabled)
update_ftrace_function();
return 0;
}
@ -213,52 +219,19 @@ static int __unregister_ftrace_function(struct ftrace_ops *ops)
*p = (*p)->next;
if (ftrace_enabled) {
/* If we only have one func left, then call that directly */
if (ftrace_list->next == &ftrace_list_end) {
ftrace_func_t func = ftrace_list->func;
if (!list_empty(&ftrace_pids)) {
set_ftrace_pid_function(func);
func = ftrace_pid_func;
}
#ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
ftrace_trace_function = func;
#else
__ftrace_trace_function = func;
#endif
}
}
if (ftrace_enabled)
update_ftrace_function();
return 0;
}
static void ftrace_update_pid_func(void)
{
ftrace_func_t func;
/* Only do something if we are tracing something */
if (ftrace_trace_function == ftrace_stub)
return;
#ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
func = ftrace_trace_function;
#else
func = __ftrace_trace_function;
#endif
if (!list_empty(&ftrace_pids)) {
set_ftrace_pid_function(func);
func = ftrace_pid_func;
} else {
if (func == ftrace_pid_func)
func = ftrace_pid_function;
}
#ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
ftrace_trace_function = func;
#else
__ftrace_trace_function = func;
#endif
update_ftrace_function();
}
#ifdef CONFIG_FUNCTION_PROFILER