summaryrefslogtreecommitdiff
path: root/kernel/trace/trace_events.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/trace/trace_events.c')
-rw-r--r--kernel/trace/trace_events.c41
1 files changed, 33 insertions, 8 deletions
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 1d18315dc836..189b09baf4fb 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -78,7 +78,7 @@ EXPORT_SYMBOL_GPL(trace_define_field);
if (ret) \
return ret;
-int trace_define_common_fields(struct ftrace_event_call *call)
+static int trace_define_common_fields(struct ftrace_event_call *call)
{
int ret;
struct trace_entry ent;
@@ -91,7 +91,6 @@ int trace_define_common_fields(struct ftrace_event_call *call)
return ret;
}
-EXPORT_SYMBOL_GPL(trace_define_common_fields);
void trace_destroy_fields(struct ftrace_event_call *call)
{
@@ -105,9 +104,25 @@ void trace_destroy_fields(struct ftrace_event_call *call)
}
}
-static void ftrace_event_enable_disable(struct ftrace_event_call *call,
+int trace_event_raw_init(struct ftrace_event_call *call)
+{
+ int id;
+
+ id = register_ftrace_event(call->event);
+ if (!id)
+ return -ENODEV;
+ call->id = id;
+ INIT_LIST_HEAD(&call->fields);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(trace_event_raw_init);
+
+static int ftrace_event_enable_disable(struct ftrace_event_call *call,
int enable)
{
+ int ret = 0;
+
switch (enable) {
case 0:
if (call->enabled) {
@@ -118,12 +133,20 @@ static void ftrace_event_enable_disable(struct ftrace_event_call *call,
break;
case 1:
if (!call->enabled) {
- call->enabled = 1;
tracing_start_cmdline_record();
- call->regfunc(call);
+ ret = call->regfunc(call);
+ if (ret) {
+ tracing_stop_cmdline_record();
+ pr_info("event trace: Could not enable event "
+ "%s\n", call->name);
+ break;
+ }
+ call->enabled = 1;
}
break;
}
+
+ return ret;
}
static void ftrace_clear_events(void)
@@ -402,7 +425,7 @@ event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
case 0:
case 1:
mutex_lock(&event_mutex);
- ftrace_event_enable_disable(call, val);
+ ret = ftrace_event_enable_disable(call, val);
mutex_unlock(&event_mutex);
break;
@@ -412,7 +435,7 @@ event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
*ppos += cnt;
- return cnt;
+ return ret ? ret : cnt;
}
static ssize_t
@@ -913,7 +936,9 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
id);
if (call->define_fields) {
- ret = call->define_fields(call);
+ ret = trace_define_common_fields(call);
+ if (!ret)
+ ret = call->define_fields(call);
if (ret < 0) {
pr_warning("Could not initialize trace point"
" events/%s\n", call->name);