[PATCH] fix swap cluster offset

[Akinobu Mita <mita@miraclelinux.com>]

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>

Index: work/mm/swapfile.c
===================================================================
--- work.orig/mm/swapfile.c
+++ work/mm/swapfile.c
@@ -116,7 +116,7 @@ static inline unsigned long scan_swap_ma
 				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)) {
-
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