tracing/kprobe: Make trace_kprobe's module callback called after jump_label update

Make sure the trace_kprobe's module notifer callback function is called
after jump_label's callback is called. Since the trace_kprobe's callback
eventually checks jump_label address during registering new kprobe on
the loading module, jump_label must be updated before this registration
happens.

Link: https://lore.kernel.org/all/173387585556.995044.3157941002975446119.stgit@devnote2/

Fixes: 6142431 ("tracing/kprobes: Support module init function probing")
Signed-off-by: Masami Hiramatsu (Google) <[email protected]>

Author: mhiramat

kernel/trace/trace_kprobe.c

@@ -725,7 +725,7 @@ static int trace_kprobe_module_callback(struct notifier_block *nb,
 
 static struct notifier_block trace_kprobe_module_nb = {
 	.notifier_call = trace_kprobe_module_callback,
-	.priority = 1	/* Invoked after kprobe module callback */
+	.priority = 2	/* Invoked after kprobe and jump_label module callback */
 };
 static int trace_kprobe_register_module_notifier(void)
 {