linux-kernel - [PATCH 18/24] tracing/kprobes: Fix trace

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Message-Id: <1253648302-5771-19-git-send-email-fweisbec@gmail.com>
Date:	Tue, 22 Sep 2009 21:38:16 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Christoph Hellwig <hch@...radead.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Jason Baron <jbaron@...hat.com>,
	"K.Prasad" <prasad@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: [PATCH 18/24] tracing/kprobes: Fix trace_probe registration order

From: Masami Hiramatsu <mhiramat@...hat.com>

Fix trace_probe registration order. ftrace_event_call and ftrace_event
must be registered before kprobe/kretprobe, because tracing/profiling
handlers dereference the event-id.

Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
Acked-by: Steven Rostedt <rostedt@...dmis.org>
Cc: Jim Keniston <jkenisto@...ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@...ibm.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Christoph Hellwig <hch@...radead.org>
Cc: Frank Ch. Eigler <fche@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Jason Baron <jbaron@...hat.com>
Cc: K.Prasad <prasad@...ux.vnet.ibm.com>
Cc: Lai Jiangshan <laijs@...fujitsu.com>
Cc: Li Zefan <lizf@...fujitsu.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc: Tom Zanussi <tzanussi@...il.com>
LKML-Reference: <20090914204856.18779.52961.stgit@...p-100-2-132.bos.redhat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
 kernel/trace/trace_kprobe.c |   42 +++++++++++++++++++-----------------------
 1 files changed, 19 insertions(+), 23 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index cbc0870..ea0db8e 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -347,20 +347,15 @@ static struct trace_probe *find_probe_event(const char *event)
 	return NULL;
 }
 
-static void __unregister_trace_probe(struct trace_probe *tp)
+/* Unregister a trace_probe and probe_event: call with locking probe_lock */
+static void unregister_trace_probe(struct trace_probe *tp)
 {
 	if (probe_is_return(tp))
 		unregister_kretprobe(&tp->rp);
 	else
 		unregister_kprobe(&tp->rp.kp);
-}
-
-/* Unregister a trace_probe and probe_event: call with locking probe_lock */
-static void unregister_trace_probe(struct trace_probe *tp)
-{
-	unregister_probe_event(tp);
-	__unregister_trace_probe(tp);
 	list_del(&tp->list);
+	unregister_probe_event(tp);
 }
 
 /* Register a trace_probe and probe_event */
@@ -371,6 +366,19 @@ static int register_trace_probe(struct trace_probe *tp)
 
 	mutex_lock(&probe_lock);
 
+	/* register as an event */
+	old_tp = find_probe_event(tp->call.name);
+	if (old_tp) {
+		/* delete old event */
+		unregister_trace_probe(old_tp);
+		free_trace_probe(old_tp);
+	}
+	ret = register_probe_event(tp);
+	if (ret) {
+		pr_warning("Faild to register probe event(%d)\n", ret);
+		goto end;
+	}
+
 	if (probe_is_return(tp))
 		ret = register_kretprobe(&tp->rp);
 	else
@@ -384,21 +392,9 @@ static int register_trace_probe(struct trace_probe *tp)
 				   tp->rp.kp.addr);
 			ret = -EINVAL;
 		}
-		goto end;
-	}
-	/* register as an event */
-	old_tp = find_probe_event(tp->call.name);
-	if (old_tp) {
-		/* delete old event */
-		unregister_trace_probe(old_tp);
-		free_trace_probe(old_tp);
-	}
-	ret = register_probe_event(tp);
-	if (ret) {
-		pr_warning("Faild to register probe event(%d)\n", ret);
-		__unregister_trace_probe(tp);
-	}
-	list_add_tail(&tp->list, &probe_list);
+		unregister_probe_event(tp);
+	} else
+		list_add_tail(&tp->list, &probe_list);
 end:
 	mutex_unlock(&probe_lock);
 	return ret;
-- 
1.6.2.3

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