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Diffstat (limited to 'kernel/trace/trace_events.c')
-rw-r--r--kernel/trace/trace_events.c69
1 files changed, 46 insertions, 23 deletions
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 83a4378dc5e..2de53628689 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -223,24 +223,25 @@ int ftrace_event_reg(struct ftrace_event_call *call,
{
struct ftrace_event_file *file = data;
+ WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT));
switch (type) {
case TRACE_REG_REGISTER:
- return tracepoint_probe_register(call->name,
+ return tracepoint_probe_register(call->tp,
call->class->probe,
file);
case TRACE_REG_UNREGISTER:
- tracepoint_probe_unregister(call->name,
+ tracepoint_probe_unregister(call->tp,
call->class->probe,
file);
return 0;
#ifdef CONFIG_PERF_EVENTS
case TRACE_REG_PERF_REGISTER:
- return tracepoint_probe_register(call->name,
+ return tracepoint_probe_register(call->tp,
call->class->perf_probe,
call);
case TRACE_REG_PERF_UNREGISTER:
- tracepoint_probe_unregister(call->name,
+ tracepoint_probe_unregister(call->tp,
call->class->perf_probe,
call);
return 0;
@@ -352,7 +353,7 @@ static int __ftrace_event_enable_disable(struct ftrace_event_file *file,
if (ret) {
tracing_stop_cmdline_record();
pr_info("event trace: Could not enable event "
- "%s\n", call->name);
+ "%s\n", ftrace_event_name(call));
break;
}
set_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags);
@@ -469,6 +470,7 @@ static void remove_event_file_dir(struct ftrace_event_file *file)
list_del(&file->list);
remove_subsystem(file->system);
+ free_event_filter(file->filter);
kmem_cache_free(file_cachep, file);
}
@@ -481,27 +483,29 @@ __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match,
{
struct ftrace_event_file *file;
struct ftrace_event_call *call;
+ const char *name;
int ret = -EINVAL;
list_for_each_entry(file, &tr->events, list) {
call = file->event_call;
+ name = ftrace_event_name(call);
- if (!call->name || !call->class || !call->class->reg)
+ if (!name || !call->class || !call->class->reg)
continue;
if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)
continue;
if (match &&
- strcmp(match, call->name) != 0 &&
+ strcmp(match, name) != 0 &&
strcmp(match, call->class->system) != 0)
continue;
if (sub && strcmp(sub, call->class->system) != 0)
continue;
- if (event && strcmp(event, call->name) != 0)
+ if (event && strcmp(event, name) != 0)
continue;
ftrace_event_enable_disable(file, set);
@@ -571,6 +575,9 @@ int trace_set_clr_event(const char *system, const char *event, int set)
{
struct trace_array *tr = top_trace_array();
+ if (!tr)
+ return -ENODEV;
+
return __ftrace_set_clr_event(tr, NULL, system, event, set);
}
EXPORT_SYMBOL_GPL(trace_set_clr_event);
@@ -699,7 +706,7 @@ static int t_show(struct seq_file *m, void *v)
if (strcmp(call->class->system, TRACE_SYSTEM) != 0)
seq_printf(m, "%s:", call->class->system);
- seq_printf(m, "%s\n", call->name);
+ seq_printf(m, "%s\n", ftrace_event_name(call));
return 0;
}
@@ -792,7 +799,7 @@ system_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
mutex_lock(&event_mutex);
list_for_each_entry(file, &tr->events, list) {
call = file->event_call;
- if (!call->name || !call->class || !call->class->reg)
+ if (!ftrace_event_name(call) || !call->class || !call->class->reg)
continue;
if (system && strcmp(call->class->system, system->name) != 0)
@@ -907,7 +914,7 @@ static int f_show(struct seq_file *m, void *v)
switch ((unsigned long)v) {
case FORMAT_HEADER:
- seq_printf(m, "name: %s\n", call->name);
+ seq_printf(m, "name: %s\n", ftrace_event_name(call));
seq_printf(m, "ID: %d\n", call->event.type);
seq_printf(m, "format:\n");
return 0;
@@ -1527,6 +1534,7 @@ event_create_dir(struct dentry *parent, struct ftrace_event_file *file)
struct trace_array *tr = file->tr;
struct list_head *head;
struct dentry *d_events;
+ const char *name;
int ret;
/*
@@ -1540,10 +1548,11 @@ event_create_dir(struct dentry *parent, struct ftrace_event_file *file)
} else
d_events = parent;
- file->dir = debugfs_create_dir(call->name, d_events);
+ name = ftrace_event_name(call);
+ file->dir = debugfs_create_dir(name, d_events);
if (!file->dir) {
pr_warning("Could not create debugfs '%s' directory\n",
- call->name);
+ name);
return -1;
}
@@ -1567,7 +1576,7 @@ event_create_dir(struct dentry *parent, struct ftrace_event_file *file)
ret = call->class->define_fields(call);
if (ret < 0) {
pr_warning("Could not initialize trace point"
- " events/%s\n", call->name);
+ " events/%s\n", name);
return -1;
}
}
@@ -1631,15 +1640,17 @@ static void event_remove(struct ftrace_event_call *call)
static int event_init(struct ftrace_event_call *call)
{
int ret = 0;
+ const char *name;
- if (WARN_ON(!call->name))
+ name = ftrace_event_name(call);
+ if (WARN_ON(!name))
return -EINVAL;
if (call->class->raw_init) {
ret = call->class->raw_init(call);
if (ret < 0 && ret != -ENOSYS)
pr_warn("Could not initialize trace events/%s\n",
- call->name);
+ name);
}
return ret;
@@ -1885,7 +1896,7 @@ __trace_add_event_dirs(struct trace_array *tr)
ret = __trace_add_new_event(call, tr);
if (ret < 0)
pr_warning("Could not create directory for event %s\n",
- call->name);
+ ftrace_event_name(call));
}
}
@@ -1894,18 +1905,20 @@ find_event_file(struct trace_array *tr, const char *system, const char *event)
{
struct ftrace_event_file *file;
struct ftrace_event_call *call;
+ const char *name;
list_for_each_entry(file, &tr->events, list) {
call = file->event_call;
+ name = ftrace_event_name(call);
- if (!call->name || !call->class || !call->class->reg)
+ if (!name || !call->class || !call->class->reg)
continue;
if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)
continue;
- if (strcmp(event, call->name) == 0 &&
+ if (strcmp(event, name) == 0 &&
strcmp(system, call->class->system) == 0)
return file;
}
@@ -1973,7 +1986,7 @@ event_enable_print(struct seq_file *m, unsigned long ip,
seq_printf(m, "%s:%s:%s",
data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR,
data->file->event_call->class->system,
- data->file->event_call->name);
+ ftrace_event_name(data->file->event_call));
if (data->count == -1)
seq_printf(m, ":unlimited\n");
@@ -2056,6 +2069,9 @@ event_enable_func(struct ftrace_hash *hash,
bool enable;
int ret;
+ if (!tr)
+ return -ENODEV;
+
/* hash funcs only work with set_ftrace_filter */
if (!enabled || !param)
return -EINVAL;
@@ -2193,7 +2209,7 @@ __trace_early_add_event_dirs(struct trace_array *tr)
ret = event_create_dir(tr->event_dir, file);
if (ret < 0)
pr_warning("Could not create directory for event %s\n",
- file->event_call->name);
+ ftrace_event_name(file->event_call));
}
}
@@ -2217,7 +2233,7 @@ __trace_early_add_events(struct trace_array *tr)
ret = __trace_early_add_new_event(call, tr);
if (ret < 0)
pr_warning("Could not create early event %s\n",
- call->name);
+ ftrace_event_name(call));
}
}
@@ -2387,6 +2403,9 @@ static __init int event_trace_enable(void)
char *token;
int ret;
+ if (!tr)
+ return -ENODEV;
+
for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) {
call = *iter;
@@ -2433,6 +2452,8 @@ static __init int event_trace_init(void)
int ret;
tr = top_trace_array();
+ if (!tr)
+ return -ENODEV;
d_tracer = tracing_init_dentry();
if (!d_tracer)
@@ -2526,6 +2547,8 @@ static __init void event_trace_self_tests(void)
int ret;
tr = top_trace_array();
+ if (!tr)
+ return;
pr_info("Running tests on trace events:\n");
@@ -2549,7 +2572,7 @@ static __init void event_trace_self_tests(void)
continue;
#endif
- pr_info("Testing event %s: ", call->name);
+ pr_info("Testing event %s: ", ftrace_event_name(call));
/*
* If an event is already enabled, someone is using
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-12 11:42:45 +0000