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@elte.hu>
Acked-by: Jason Baron <jbaron@redhat.com>
Tested-by: Avi Kivity <avi@redhat.com>
Tested-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Link: http://lkml.kernel.org/r/4E00038B.2060404@cn.fujitsu.com
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 9 insertions, 5 deletions

diff --git a/kernel/jump_label.c b/kernel/jump_label.c
index fa27e750dbc..a8ce45097f3 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