From dc82ec98a4727fd51b77e92d05fe7d2db3dcc11c Mon Sep 17 00:00:00 2001
From: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Date: Thu, 9 Jul 2009 16:22:22 +0800
Subject: tracing/filter: Remove empty subsystem and its directory

Remove empty subsystem and its directory when module unload.

Before patch:
 # rmmod trace-events-sample.ko
 # ls sample
 enable  filter

After patch:
 # rmmod trace-events-sample.ko
 # ls sample
 ls: cannot access sample: No such file or directory

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Acked-by: Tom Zanussi <tzanussi@gmail.com>
Reviewed-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <4A55A8BE.9010707@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 kernel/trace/trace.h | 1 +
 1 file changed, 1 insertion(+)

(limited to 'kernel/trace/trace.h')

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 52eb0d8dcd75..94305c7bc11c 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -757,6 +757,7 @@ struct event_subsystem {
 	const char		*name;
 	struct dentry		*entry;
 	void			*filter;
+	int			nr_events;
 };
 
 struct filter_pred;
-- 
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