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. Signed-off-by: Oleg Nesterov <[email protected]> --- kernel/trace/trace_events_filter.c | 39 ++++++++++++++--------------------- 1 files changed, 16 insertions(+), 23 deletions(-) diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c index 54a125c..c2ef5a5 100644 --- a/kernel/trace/trace_events_filter.c +++ b/kernel/trace/trace_events_filter.c @@ -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 -- 1.5.5.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
