From cbb62f0a550c0a01b94b32e16838fb3acd4c63ef Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Mon, 30 Mar 2009 19:07:04 +0200
Subject: [PATCH] --- yaml --- r: 147304 b: refs/heads/master c:
 195564390210977954fe4ef45b39cdee34f41b59 h: refs/heads/master v: v3

---
 [refs]                                       |  2 +-
 trunk/Documentation/perf_counter/kerneltop.c | 14 +-------------
 2 files changed, 2 insertions(+), 14 deletions(-)

diff --git a/[refs] b/[refs]
index 9dd0707b9897..d08ee3f11c74 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 38ff667b321b00f5e6830e93fb4ab11a653a2920
+refs/heads/master: 195564390210977954fe4ef45b39cdee34f41b59
diff --git a/trunk/Documentation/perf_counter/kerneltop.c b/trunk/Documentation/perf_counter/kerneltop.c
index fda1438365dc..2779c57ad4ba 100644
--- a/trunk/Documentation/perf_counter/kerneltop.c
+++ b/trunk/Documentation/perf_counter/kerneltop.c
@@ -1125,22 +1125,10 @@ struct mmap_data {
 static unsigned int mmap_read_head(struct mmap_data *md)
 {
 	struct perf_counter_mmap_page *pc = md->base;
-	unsigned int seq, head;
-
-repeat:
-	rmb();
-	seq = pc->lock;
-
-	if (unlikely(seq & 1)) {
-		cpu_relax();
-		goto repeat;
-	}
+	int head;
 
 	head = pc->data_head;
-
 	rmb();
-	if (pc->lock != seq)
-		goto repeat;
 
 	return head;
 }