linux-kernel - [tip:tracing/ftrace] tracepoints: dont update zero-sized tracepoint sections

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Date:	Wed, 18 Mar 2009 18:57:28 GMT
From:	Ingo Molnar <mingo@...e.hu>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	jaswinderrajput@...il.com, fweisbec@...il.com, rostedt@...dmis.org,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:tracing/ftrace] tracepoints: dont update zero-sized tracepoint sections

Commit-ID:  ec625cb29e66824f7ce41082617aeb93fa4e42e2
Gitweb:     http://git.kernel.org/tip/ec625cb29e66824f7ce41082617aeb93fa4e42e2
Author:     Ingo Molnar <mingo@...e.hu>
AuthorDate: Wed, 18 Mar 2009 19:54:04 +0100
Commit:     Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 18 Mar 2009 19:55:00 +0100

tracepoints: dont update zero-sized tracepoint sections

Zero-sized tracepoint sections can occur if tracing is enabled but
no tracepoint is defined. Do not emit a warning in that case.

Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
LKML-Reference: <1237394936.3132.1.camel@...alhost.localdomain>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 kernel/tracepoint.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index adf2873..1ef5d3a 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -278,10 +278,8 @@ tracepoint_update_probe_range(struct tracepoint *begin, struct tracepoint *end)
 	struct tracepoint *iter;
 	struct tracepoint_entry *mark_entry;
 
-	if (!begin) {
-		WARN_ON_ONCE(1);
+	if (!begin)
 		return;
-	}
 
 	mutex_lock(&tracepoints_mutex);
 	for (iter = begin; iter < end; iter++) {
--
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