From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Tue, 18 Dec 2007 12:22:10 +0100
Subject: [lockdep] lockstat: better class name representation
Message-id: 20071218112316.098034677@chello.nl
O-Subject: [RHEL5.2 PATCH 09/14] lockstat: better class name representation
Bugzilla: 193729

optionally add class->name_version and class->subclass to the class name

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/lockdep_proc.c b/kernel/lockdep_proc.c
index 4925bda..6ab388c 100644
--- a/kernel/lockdep_proc.c
+++ b/kernel/lockdep_proc.c
@@ -403,8 +403,30 @@ static void seq_stats(struct seq_file *m, struct lock_stat_data *data)
 	class = data->class;
 	stats = &data->stats;
 
-	snprintf(name, 38, "%s", class->name);
+	namelen = 38;
+	if (class->name_version > 1)
+		namelen -= 2; /* XXX truncates versions > 9 */
+	if (class->subclass)
+		namelen -= 2;
+
+	if (!class->name) {
+		char str[KSYM_NAME_LEN];
+		const char *key_name;
+
+		key_name = __get_key_name(class->key, str);
+		snprintf(name, namelen, "%s", key_name);
+	} else {
+		snprintf(name, namelen, "%s", class->name);
+	}
 	namelen = strlen(name);
+	if (class->name_version > 1) {
+		snprintf(name+namelen, 3, "#%d", class->name_version);
+		namelen += 2;
+	}
+	if (class->subclass) {
+		snprintf(name+namelen, 3, "/%d", class->subclass);
+		namelen += 2;
+	}
 
 	if (stats->write_holdtime.nr) {
 		if (stats->read_holdtime.nr)