From: Akinobu Mita <mita@miraclelinux.com>
Date: Wed, 22 Mar 2006 08:09:09 +0000 (-0800)
Subject: [PATCH] fix swap cluster offset
X-Git-Tag: v2.6.17-rc1~1129^2~19
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=9b65ef59d42a56fa1358958ede77aaa5bac385a8;p=~emulex%2Finfiniband.git

[PATCH] fix swap cluster offset

When we've allocated SWAPFILE_CLUSTER pages, ->cluster_next should be the
first index of swap cluster.  But current code probably sets it wrong offset.

Signed-off-by: Akinobu Mita <mita@miraclelinux.com>
Acked-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 1f9cf0d073b..365ed6ff182 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -116,7 +116,7 @@ static inline unsigned long scan_swap_map(struct swap_info_struct *si)
 				last_in_cluster = offset + SWAPFILE_CLUSTER;
 			else if (offset == last_in_cluster) {
 				spin_lock(&swap_lock);
-				si->cluster_next = offset-SWAPFILE_CLUSTER-1;
+				si->cluster_next = offset-SWAPFILE_CLUSTER+1;
 				goto cluster;
 			}
 			if (unlikely(--latency_ration < 0)) {