[PATCH] Frontswap: fix the condition in BUG_ON

[Li Haifeng <omycle@xxxxxxxxx>]

>From 012a564c7210346b99d12e3d2485542bb090586e Mon Sep 17 00:00:00 2001
From: Haifeng Li <omycle@xxxxxxxxx>
Date: Fri, 31 Oct 2014 17:40:44 +0800
Subject: [PATCH] Frontswap: fix the condition in BUG_ON

The largest index of swap device is MAX_SWAPFILES-1. So the type
should be less than MAX_SWAPFILES.

Signed-off-by: Haifeng Li <omycle@xxxxxxxxx>
---
 mm/frontswap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/frontswap.c b/mm/frontswap.c
index c30eec5..1b80c05 100644
--- a/mm/frontswap.c
+++ b/mm/frontswap.c
@@ -182,7 +182,7 @@ void __frontswap_init(unsigned type, unsigned long *map)
        if (frontswap_ops)
                frontswap_ops->init(type);
        else {
-               BUG_ON(type > MAX_SWAPFILES);
+               BUG_ON(type >= MAX_SWAPFILES);
                set_bit(type, need_init);
        }
 }
-- 
1.9.1

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