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ftrace: Set callback to ftrace_stub when no ops are registered

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The clean up that adds the helper function ftrace_ops_get_func()
caused the default function to not change when DYNAMIC_FTRACE was not
set and no ftrace_ops were registered. Although static tracing is
not very useful (not having DYNAMIC_FTRACE set), it is still supported
and we don't want to break it.

Clean up the if statement even more to specifically have the default
function call ftrace_stub when no ftrace_ops are registered. This
fixes the small bug for static tracing as well as makes the code a
bit more understandable.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-09-10 10:42:46 -04:00 committed by Steven Rostedt
parent 8735405988
commit f7aad4e1a8
1 changed files with 13 additions and 6 deletions
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19
kernel/trace/ftrace.c
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@ -253,18 +253,25 @@ static void update_ftrace_function(void)
{
ftrace_func_t func;
/*
* Prepare the ftrace_ops that the arch callback will use.
* If there's only one ftrace_ops registered, the ftrace_ops_list
* will point to the ops we want.
*/
set_function_trace_op = ftrace_ops_list;
/* If there's no ftrace_ops registered, just call the stub function */
if (ftrace_ops_list == &ftrace_list_end) {
func = ftrace_stub;
/*
* If we are at the end of the list and this ops is
* recursion safe and not dynamic and the arch supports passing ops,
* then have the mcount trampoline call the function directly.
*/
if (ftrace_ops_list == &ftrace_list_end ||
(ftrace_ops_list->next == &ftrace_list_end)) {
/* Set the ftrace_ops that the arch callback uses */
set_function_trace_op = ftrace_ops_list;
} else if (ftrace_ops_list->next == &ftrace_list_end) {
func = ftrace_ops_get_func(ftrace_ops_list);
} else {
/* Just use the default ftrace_ops */
set_function_trace_op = &ftrace_list_end;