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tracing: Change apply_subsystem_event_filter() paths to check file->system == dir 

filter_free_subsystem_preds(), filter_free_subsystem_filters() and
replace_system_preds() can simply check file->system->subsystem and
avoid strcmp(call->class->system).

Better yet, we can pass "struct ftrace_subsystem_dir *dir" instead of
event_subsystem and just check file->system == dir.

Thanks to Namhyung Kim who pointed out that replace_system_preds() can
be changed too.

Link: http://lkml.kernel.org/p/20140715184829.GA20516@redhat.com

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Oleg Nesterov 2014-07-15 20:48:29 +02:00 committed by Steven Rostedt
parent e738d3ebbf
commit bb9ef1cb7d
1 changed files with 16 additions and 23 deletions
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39
kernel/trace/trace_events_filter.c
View File

@ -842,17 +842,14 @@ static inline void __remove_filter(struct ftrace_event_file *file)
remove_filter_string(file->filter);
}
static void filter_free_subsystem_preds(struct event_subsystem *system,
static void filter_free_subsystem_preds(struct ftrace_subsystem_dir *dir,
struct trace_array *tr)
{
struct ftrace_event_file *file;
struct ftrace_event_call *call;
list_for_each_entry(file, &tr->events, list) {
call = file->event_call;
if (strcmp(call->class->system, system->name) != 0)
if (file->system != dir)
continue;
__remove_filter(file);
}
}
@ -870,15 +867,13 @@ static inline void __free_subsystem_filter(struct ftrace_event_file *file)
}
}
static void filter_free_subsystem_filters(struct event_subsystem *system,
static void filter_free_subsystem_filters(struct ftrace_subsystem_dir *dir,
struct trace_array *tr)
{
struct ftrace_event_file *file;
struct ftrace_event_call *call;
list_for_each_entry(file, &tr->events, list) {
call = file->event_call;
if (strcmp(call->class->system, system->name) != 0)
if (file->system != dir)
continue;
__free_subsystem_filter(file);
}
@ -1724,13 +1719,12 @@ struct filter_list {
struct event_filter *filter;
};
static int replace_system_preds(struct event_subsystem *system,
static int replace_system_preds(struct ftrace_subsystem_dir *dir,
struct trace_array *tr,
struct filter_parse_state *ps,
char *filter_string)
{
struct ftrace_event_file *file;
struct ftrace_event_call *call;
struct filter_list *filter_item;
struct filter_list *tmp;
LIST_HEAD(filter_list);
@ -1738,15 +1732,15 @@ static int replace_system_preds(struct event_subsystem *system,
int err;
list_for_each_entry(file, &tr->events, list) {
call = file->event_call;
if (strcmp(call->class->system, system->name) != 0)
if (file->system != dir)
continue;
/*
* Try to see if the filter can be applied
* (filter arg is ignored on dry_run)
*/
err = replace_preds(call, NULL, ps, filter_string, true);
err = replace_preds(file->event_call, NULL, ps,
filter_string, true);
if (err)
event_set_no_set_filter_flag(file);
else
@ -1756,9 +1750,7 @@ static int replace_system_preds(struct event_subsystem *system,
list_for_each_entry(file, &tr->events, list) {
struct event_filter *filter;
call = file->event_call;
if (strcmp(call->class->system, system->name) != 0)
if (file->system != dir)
continue;
if (event_no_set_filter_flag(file))
@ -1780,7 +1772,8 @@ static int replace_system_preds(struct event_subsystem *system,
if (err)
goto fail_mem;
err = replace_preds(call, filter, ps, filter_string, false);
err = replace_preds(file->event_call, filter, ps,
filter_string, false);
if (err) {
filter_disable(file);
parse_error(ps, FILT_ERR_BAD_SUBSYS_FILTER, 0);
@ -1928,7 +1921,7 @@ int create_event_filter(struct ftrace_event_call *call,
* Identical to create_filter() except that it creates a subsystem filter
* and always remembers @filter_str.
*/
static int create_system_filter(struct event_subsystem *system,
static int create_system_filter(struct ftrace_subsystem_dir *dir,
struct trace_array *tr,
char *filter_str, struct event_filter **filterp)
{
@ -1938,7 +1931,7 @@ static int create_system_filter(struct event_subsystem *system,
err = create_filter_start(filter_str, true, &ps, &filter);
if (!err) {
err = replace_system_preds(system, tr, ps, filter_str);
err = replace_system_preds(dir, tr, ps, filter_str);
if (!err) {
/* System filters just show a default message */
kfree(filter->filter_string);
@ -2022,18 +2015,18 @@ int apply_subsystem_event_filter(struct ftrace_subsystem_dir *dir,
}
if (!strcmp(strstrip(filter_string), "0")) {
filter_free_subsystem_preds(system, tr);
filter_free_subsystem_preds(dir, tr);
remove_filter_string(system->filter);
filter = system->filter;
system->filter = NULL;
/* Ensure all filters are no longer used */
synchronize_sched();
filter_free_subsystem_filters(system, tr);
filter_free_subsystem_filters(dir, tr);
__free_filter(filter);
goto out_unlock;
}
err = create_system_filter(system, tr, filter_string, &filter);
err = create_system_filter(dir, tr, filter_string, &filter);
if (filter) {
/*
* No event actually uses the system filter