linux-kernel - [PATCH v2 0/7] tracing: ->filter cleanups

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Date:	Tue, 15 Jul 2014 20:47:53 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Tom Zanussi <tom.zanussi@...ux.intel.com>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/7] tracing: ->filter cleanups

Hello,

To avoid the confusion, let me resend everything (except the 1st patch
you already applied) with v2 tag.

Changes:

	4/7 - fix the typo in changelog, add the ack from Srikar

	6/7 - by discussion with you and Namhyung: pass dir rather
	      then system, update replace_system_preds() as well.

	7/7 - new, cosmetic/trivial.

I tried to play with "filter" files, everything seems to work with the
additional debugging patch below.

Oleg.
---

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 7a8c152..4c16229 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -848,6 +848,7 @@ static void filter_free_subsystem_preds(struct ftrace_subsystem_dir *dir,
 	struct ftrace_event_file *file;
 
 	list_for_each_entry(file, &tr->events, list) {
+BUG_ON((file->system != dir) != !!strcmp(file->event_call->class->system, dir->subsystem->name));
 		if (file->system != dir)
 			continue;
 		__remove_filter(file);
@@ -873,6 +874,7 @@ static void filter_free_subsystem_filters(struct ftrace_subsystem_dir *dir,
 	struct ftrace_event_file *file;
 
 	list_for_each_entry(file, &tr->events, list) {
+BUG_ON((file->system != dir) != !!strcmp(file->event_call->class->system, dir->subsystem->name));
 		if (file->system != dir)
 			continue;
 		__free_subsystem_filter(file);
@@ -1731,6 +1733,7 @@ static int replace_system_preds(struct ftrace_subsystem_dir *dir,
 	int err;
 
 	list_for_each_entry(file, &tr->events, list) {
+BUG_ON((file->system != dir) != !!strcmp(file->event_call->class->system, dir->subsystem->name));
 		if (file->system != dir)
 			continue;
 
@@ -1748,6 +1751,7 @@ static int replace_system_preds(struct ftrace_subsystem_dir *dir,
 	list_for_each_entry(file, &tr->events, list) {
 		struct event_filter *filter;
 
+BUG_ON((file->system != dir) != !!strcmp(file->event_call->class->system, dir->subsystem->name));
 		if (file->system != dir)
 			continue;
 

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