tracing: trigger: Replace unneeded RCU-list traversals

With CONFIG_PROVE_RCU_LIST, I had many suspicious RCU warnings
when I ran ftracetest trigger testcases.

-----
  # dmesg -c > /dev/null
  # ./ftracetest test.d/trigger
  ...
  # dmesg | grep "RCU-list traversed" | cut -f 2 -d ] | cut -f 2 -d " "
  kernel/trace/trace_events_hist.c:6070
  kernel/trace/trace_events_hist.c:1760
  kernel/trace/trace_events_hist.c:5911
  kernel/trace/trace_events_trigger.c:504
  kernel/trace/trace_events_hist.c:1810
  kernel/trace/trace_events_hist.c:3158
  kernel/trace/trace_events_hist.c:3105
  kernel/trace/trace_events_hist.c:5518
  kernel/trace/trace_events_hist.c:5998
  kernel/trace/trace_events_hist.c:6019
  kernel/trace/trace_events_hist.c:6044
  kernel/trace/trace_events_trigger.c:1500
  kernel/trace/trace_events_trigger.c:1540
  kernel/trace/trace_events_trigger.c:539
  kernel/trace/trace_events_trigger.c:584
-----

I investigated those warnings and found that the RCU-list
traversals in event trigger and hist didn't need to use
RCU version because those were called only under event_mutex.

I also checked other RCU-list traversals related to event
trigger list, and found that most of them were called from
event_hist_trigger_func() or hist_unregister_trigger() or
register/unregister functions except for a few cases.

Replace these unneeded RCU-list traversals with normal list
traversal macro and lockdep_assert_held() to check the
event_mutex is held.

Link: http://lkml.kernel.org/r/157680910305.11685.15110237954275915782.stgit@devnote2
Cc: stable@vger.kernel.org
Fixes: 30350d65ac567 ("tracing: Add variable support to hist triggers")
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index f62de5f..d33b046 100644 (file)
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -1766,11 +1766,13 @@ static struct hist_field *find_var(struct hist_trigger_data *hist_data,
        struct event_trigger_data *test;
        struct hist_field *hist_field;
 
+       lockdep_assert_held(&event_mutex);
+
        hist_field = find_var_field(hist_data, var_name);
        if (hist_field)
                return hist_field;
 
-       list_for_each_entry_rcu(test, &file->triggers, list) {
+       list_for_each_entry(test, &file->triggers, list) {
                if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
                        test_data = test->private_data;
                        hist_field = find_var_field(test_data, var_name);
@@ -1820,7 +1822,9 @@ static struct hist_field *find_file_var(struct trace_event_file *file,
        struct event_trigger_data *test;
        struct hist_field *hist_field;
 
-       list_for_each_entry_rcu(test, &file->triggers, list) {
+       lockdep_assert_held(&event_mutex);
+
+       list_for_each_entry(test, &file->triggers, list) {
                if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
                        test_data = test->private_data;
                        hist_field = find_var_field(test_data, var_name);
@@ -3115,7 +3119,9 @@ static char *find_trigger_filter(struct hist_trigger_data *hist_data,
 {
        struct event_trigger_data *test;
 
-       list_for_each_entry_rcu(test, &file->triggers, list) {
+       lockdep_assert_held(&event_mutex);
+
+       list_for_each_entry(test, &file->triggers, list) {
                if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
                        if (test->private_data == hist_data)
                                return test->filter_str;
@@ -3166,9 +3172,11 @@ find_compatible_hist(struct hist_trigger_data *target_hist_data,
        struct event_trigger_data *test;
        unsigned int n_keys;
 
+       lockdep_assert_held(&event_mutex);
+
        n_keys = target_hist_data->n_fields - target_hist_data->n_vals;
 
-       list_for_each_entry_rcu(test, &file->triggers, list) {
+       list_for_each_entry(test, &file->triggers, list) {
                if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
                        hist_data = test->private_data;
 
@@ -5528,7 +5536,7 @@ static int hist_show(struct seq_file *m, void *v)
                goto out_unlock;
        }
 
-       list_for_each_entry_rcu(data, &event_file->triggers, list) {
+       list_for_each_entry(data, &event_file->triggers, list) {
                if (data->cmd_ops->trigger_type == ETT_EVENT_HIST)
                        hist_trigger_show(m, data, n++);
        }
@@ -5921,7 +5929,9 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
        if (hist_data->attrs->name && !named_data)
                goto new;
 
-       list_for_each_entry_rcu(test, &file->triggers, list) {
+       lockdep_assert_held(&event_mutex);
+
+       list_for_each_entry(test, &file->triggers, list) {
                if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
                        if (!hist_trigger_match(data, test, named_data, false))
                                continue;
@@ -6005,10 +6015,12 @@ static bool have_hist_trigger_match(struct event_trigger_data *data,
        struct event_trigger_data *test, *named_data = NULL;
        bool match = false;
 
+       lockdep_assert_held(&event_mutex);
+
        if (hist_data->attrs->name)
                named_data = find_named_trigger(hist_data->attrs->name);
 
-       list_for_each_entry_rcu(test, &file->triggers, list) {
+       list_for_each_entry(test, &file->triggers, list) {
                if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
                        if (hist_trigger_match(data, test, named_data, false)) {
                                match = true;
@@ -6026,10 +6038,12 @@ static bool hist_trigger_check_refs(struct event_trigger_data *data,
        struct hist_trigger_data *hist_data = data->private_data;
        struct event_trigger_data *test, *named_data = NULL;
 
+       lockdep_assert_held(&event_mutex);
+
        if (hist_data->attrs->name)
                named_data = find_named_trigger(hist_data->attrs->name);
 
-       list_for_each_entry_rcu(test, &file->triggers, list) {
+       list_for_each_entry(test, &file->triggers, list) {
                if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
                        if (!hist_trigger_match(data, test, named_data, false))
                                continue;
@@ -6051,10 +6065,12 @@ static void hist_unregister_trigger(char *glob, struct event_trigger_ops *ops,
        struct event_trigger_data *test, *named_data = NULL;
        bool unregistered = false;
 
+       lockdep_assert_held(&event_mutex);
+
        if (hist_data->attrs->name)
                named_data = find_named_trigger(hist_data->attrs->name);
 
-       list_for_each_entry_rcu(test, &file->triggers, list) {
+       list_for_each_entry(test, &file->triggers, list) {
                if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
                        if (!hist_trigger_match(data, test, named_data, false))
                                continue;
@@ -6080,7 +6096,9 @@ static bool hist_file_check_refs(struct trace_event_file *file)
        struct hist_trigger_data *hist_data;
        struct event_trigger_data *test;
 
-       list_for_each_entry_rcu(test, &file->triggers, list) {
+       lockdep_assert_held(&event_mutex);
+
+       list_for_each_entry(test, &file->triggers, list) {
                if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
                        hist_data = test->private_data;
                        if (check_var_refs(hist_data))
@@ -6323,7 +6341,8 @@ hist_enable_trigger(struct event_trigger_data *data, void *rec,
        struct enable_trigger_data *enable_data = data->private_data;
        struct event_trigger_data *test;
 
-       list_for_each_entry_rcu(test, &enable_data->file->triggers, list) {
+       list_for_each_entry_rcu(test, &enable_data->file->triggers, list,
+                               lockdep_is_held(&event_mutex)) {
                if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
                        if (enable_data->enable)
                                test->paused = false;

diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index 2cd53ca..40106ff 100644 (file)
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -501,7 +501,9 @@ void update_cond_flag(struct trace_event_file *file)
        struct event_trigger_data *data;
        bool set_cond = false;
 
-       list_for_each_entry_rcu(data, &file->triggers, list) {
+       lockdep_assert_held(&event_mutex);
+
+       list_for_each_entry(data, &file->triggers, list) {
                if (data->filter || event_command_post_trigger(data->cmd_ops) ||
                    event_command_needs_rec(data->cmd_ops)) {
                        set_cond = true;
@@ -536,7 +538,9 @@ static int register_trigger(char *glob, struct event_trigger_ops *ops,
        struct event_trigger_data *test;
        int ret = 0;
 
-       list_for_each_entry_rcu(test, &file->triggers, list) {
+       lockdep_assert_held(&event_mutex);
+
+       list_for_each_entry(test, &file->triggers, list) {
                if (test->cmd_ops->trigger_type == data->cmd_ops->trigger_type) {
                        ret = -EEXIST;
                        goto out;
@@ -581,7 +585,9 @@ static void unregister_trigger(char *glob, struct event_trigger_ops *ops,
        struct event_trigger_data *data;
        bool unregistered = false;
 
-       list_for_each_entry_rcu(data, &file->triggers, list) {
+       lockdep_assert_held(&event_mutex);
+
+       list_for_each_entry(data, &file->triggers, list) {
                if (data->cmd_ops->trigger_type == test->cmd_ops->trigger_type) {
                        unregistered = true;
                        list_del_rcu(&data->list);
@@ -1497,7 +1503,9 @@ int event_enable_register_trigger(char *glob,
        struct event_trigger_data *test;
        int ret = 0;
 
-       list_for_each_entry_rcu(test, &file->triggers, list) {
+       lockdep_assert_held(&event_mutex);
+
+       list_for_each_entry(test, &file->triggers, list) {
                test_enable_data = test->private_data;
                if (test_enable_data &&
                    (test->cmd_ops->trigger_type ==
@@ -1537,7 +1545,9 @@ void event_enable_unregister_trigger(char *glob,
        struct event_trigger_data *data;
        bool unregistered = false;
 
-       list_for_each_entry_rcu(data, &file->triggers, list) {
+       lockdep_assert_held(&event_mutex);
+
+       list_for_each_entry(data, &file->triggers, list) {
                enable_data = data->private_data;
                if (enable_data &&
                    (data->cmd_ops->trigger_type ==