linux-kernel - [tip:perf/urgent] jump_label: Fix jump

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Date:	Fri, 1 Jul 2011 15:12:21 GMT
From:	tip-bot for Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	xiaoguangrong@...fujitsu.com, rostedt@...dmis.org,
	johannes@...solutions.net, tglx@...utronix.de, jbaron@...hat.com,
	mingo@...e.hu, avi@...hat.com
Subject: [tip:perf/urgent] jump_label: Fix jump_label update for modules

Commit-ID:  140fe3b1ab9c082182ef13359fab4ddba95c24c3
Gitweb:     http://git.kernel.org/tip/140fe3b1ab9c082182ef13359fab4ddba95c24c3
Author:     Xiao Guangrong <xiaoguangrong@...fujitsu.com>
AuthorDate: Tue, 21 Jun 2011 10:35:55 +0800
Committer:  Steven Rostedt <rostedt@...dmis.org>
CommitDate: Wed, 29 Jun 2011 09:59:17 -0400

jump_label: Fix jump_label update for modules

The jump labels entries for modules do not stop at __stop__jump_table,
but after mod->jump_entries + mod_num_jump_entries.

By checking the wrong end point, module trace events never get enabled.

Cc: Ingo Molnar <mingo@...e.hu>
Acked-by: Jason Baron <jbaron@...hat.com>
Tested-by: Avi Kivity <avi@...hat.com>
Tested-by: Johannes Berg <johannes@...solutions.net>
Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Link: http://lkml.kernel.org/r/4E00038B.2060404@cn.fujitsu.com
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
 kernel/jump_label.c |   14 +++++++++-----
 1 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/kernel/jump_label.c b/kernel/jump_label.c
index fa27e75..a8ce450 100644
--- a/kernel/jump_label.c
+++ b/kernel/jump_label.c
@@ -375,15 +375,19 @@ int jump_label_text_reserved(void *start, void *end)
 
 static void jump_label_update(struct jump_label_key *key, int enable)
 {
-	struct jump_entry *entry = key->entries;
-
-	/* if there are no users, entry can be NULL */
-	if (entry)
-		__jump_label_update(key, entry, __stop___jump_table, enable);
+	struct jump_entry *entry = key->entries, *stop = __stop___jump_table;
 
 #ifdef CONFIG_MODULES
+	struct module *mod = __module_address((jump_label_t)key);
+
 	__jump_label_mod_update(key, enable);
+
+	if (mod)
+		stop = mod->jump_entries + mod->num_jump_entries;
 #endif
+	/* if there are no users, entry can be NULL */
+	if (entry)
+		__jump_label_update(key, entry, stop, enable);
 }
 
 #endif
--
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