From: Joe Korty <joe.korty@ccur.com>
Date: Mon, 25 Aug 2008 21:16:23 +0000 (-0400)
Subject: lockstat: repair erronous contention statistics
X-Git-Tag: v2.6.27-rc5~3^2~2
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=04148b73b89d49fe0fe201bcee395e51f7d637ce;p=linux-2.6

lockstat: repair erronous contention statistics

Fix bad contention counting in /proc/lock_stat.

/proc/lockstat tries to gather per-ip contention
statistics per-lock.  This was failing due to
a garbage per-ip index selector being used.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 3bfb1877a0..b5db51d280 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -3029,7 +3029,7 @@ found_it:
 
 	stats = get_lock_stats(hlock_class(hlock));
 	if (point < ARRAY_SIZE(stats->contention_point))
-		stats->contention_point[i]++;
+		stats->contention_point[point]++;
 	if (lock->cpu != smp_processor_id())
 		stats->bounces[bounce_contended + !!hlock->read]++;
 	put_lock_stats(stats);