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tracing: Replace usage of found with dedicated list iterator variable

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To move the list iterator variable into the list_for_each_entry_*()
macro in the future it should be avoided to use the list iterator
variable after the loop body.

To *never* use the list iterator variable after the loop it was
concluded to use a separate iterator variable instead of a
found boolean [1].

This removes the need to use a found variable and simply checking if
the variable was set, can determine if the break/goto was hit.

Link: https://lkml.kernel.org/r/20220427170734.819891-4-jakobkoschel@gmail.com

Cc: Ingo Molnar <mingo@redhat.com>
Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@mail.gmail.com/ [1]
Signed-off-by: Jakob Koschel <jakobkoschel@gmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Jakob Koschel
2022-04-27 19:07:33 +02:00
committed by Steven Rostedt (Google)
parent 99d8ae4ec8
commit 45e333ce2a
2 changed files with 18 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kernel/trace/trace_events_trigger.c
+11 -13
View File
@@ -609,14 +609,13 @@ static void unregister_trigger(char *glob,
struct event_trigger_data *test,
struct trace_event_file *file)
{
struct event_trigger_data *data;
bool unregistered = false;
struct event_trigger_data *data = NULL, *iter;
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_for_each_entry(iter, &file->triggers, list) {
if (iter->cmd_ops->trigger_type == test->cmd_ops->trigger_type) {
data = iter;
list_del_rcu(&data->list);
trace_event_trigger_enable_disable(file, 0);
update_cond_flag(file);
@@ -624,7 +623,7 @@ static void unregister_trigger(char *glob,
}
}
if (unregistered && data->ops->free)
if (data && data->ops->free)
data->ops->free(data);
}
@@ -1870,19 +1869,18 @@ void event_enable_unregister_trigger(char *glob,
struct trace_event_file *file)
{
struct enable_trigger_data *test_enable_data = test->private_data;
struct event_trigger_data *data = NULL, *iter;
struct enable_trigger_data *enable_data;
struct event_trigger_data *data;
bool unregistered = false;
lockdep_assert_held(&event_mutex);
list_for_each_entry(data, &file->triggers, list) {
enable_data = data->private_data;
list_for_each_entry(iter, &file->triggers, list) {
enable_data = iter->private_data;
if (enable_data &&
(data->cmd_ops->trigger_type ==
(iter->cmd_ops->trigger_type ==
test->cmd_ops->trigger_type) &&
(enable_data->file == test_enable_data->file)) {
unregistered = true;
data = iter;
list_del_rcu(&data->list);
trace_event_trigger_enable_disable(file, 0);
update_cond_flag(file);
@@ -1890,7 +1888,7 @@ void event_enable_unregister_trigger(char *glob,
}
}
if (unregistered && data->ops->free)
if (data && data->ops->free)
data->ops->free(data);
}