linux-kernel - [PATCH 3/3] tracing: Kill the !CONFIG_MODULES code in trace

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Message-ID: <20130731173137.GA31043@redhat.com>
Date:	Wed, 31 Jul 2013 19:31:37 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] tracing: Kill the !CONFIG_MODULES code in
	trace_events.c

Move trace_module_nb under CONFIG_MODULES and kill the dummy
trace_module_notify(). Imho it doesn't make sense to define
"struct notifier_block" and its .notifier_call just to avoid
"ifdef" in event_trace_init(), and all other !CONFIG_MODULES
code has already gone away.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
 kernel/trace/trace_events.c |   18 ++++++------------
 1 files changed, 6 insertions(+), 12 deletions(-)

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 77ef314..6695970 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -1810,12 +1810,10 @@ static int trace_module_notify(struct notifier_block *self,
 	return 0;
 }
 
-#else
-static inline int trace_module_notify(struct notifier_block *self,
-				      unsigned long val, void *data)
-{
-	return 0;
-}
+static struct notifier_block trace_module_nb = {
+	.notifier_call = trace_module_notify,
+	.priority = 0,
+};
 #endif /* CONFIG_MODULES */
 
 /* Create a new event directory structure for a trace directory. */
@@ -2183,11 +2181,6 @@ static void __add_event_to_tracers(struct ftrace_event_call *call)
 		__trace_add_new_event(call, tr);
 }
 
-static struct notifier_block trace_module_nb = {
-	.notifier_call = trace_module_notify,
-	.priority = 0,
-};
-
 extern struct ftrace_event_call *__start_ftrace_events[];
 extern struct ftrace_event_call *__stop_ftrace_events[];
 
@@ -2392,10 +2385,11 @@ static __init int event_trace_init(void)
 	if (ret)
 		return ret;
 
+#ifdef CONFIG_MODULES
 	ret = register_module_notifier(&trace_module_nb);
 	if (ret)
 		pr_warning("Failed to register trace events module notifier\n");
-
+#endif
 	return 0;
 }
 early_initcall(event_trace_memsetup);
-- 
1.5.5.1

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