diff options
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/trace_event_profile.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/kernel/trace/trace_event_profile.c b/kernel/trace/trace_event_profile.c index 55a25c933d1..df4a74efd50 100644 --- a/kernel/trace/trace_event_profile.c +++ b/kernel/trace/trace_event_profile.c @@ -8,6 +8,14 @@ #include <linux/module.h> #include "trace.h" +static int ftrace_profile_enable_event(struct ftrace_event_call *event) +{ + if (atomic_inc_return(&event->profile_count)) + return 0; + + return event->profile_enable(); +} + int ftrace_profile_enable(int event_id) { struct ftrace_event_call *event; @@ -17,7 +25,7 @@ int ftrace_profile_enable(int event_id) list_for_each_entry(event, &ftrace_events, list) { if (event->id == event_id && event->profile_enable && try_module_get(event->mod)) { - ret = event->profile_enable(event); + ret = ftrace_profile_enable_event(event); break; } } @@ -26,6 +34,14 @@ int ftrace_profile_enable(int event_id) return ret; } +static void ftrace_profile_disable_event(struct ftrace_event_call *event) +{ + if (!atomic_add_negative(-1, &event->profile_count)) + return; + + event->profile_disable(); +} + void ftrace_profile_disable(int event_id) { struct ftrace_event_call *event; @@ -33,7 +49,7 @@ void ftrace_profile_disable(int event_id) mutex_lock(&event_mutex); list_for_each_entry(event, &ftrace_events, list) { if (event->id == event_id) { - event->profile_disable(event); + ftrace_profile_disable_event(event); module_put(event->mod); break; } |