From 4eac293654f0edf84f7adbdafff171c5f7985ff2 Mon Sep 17 00:00:00 2001
From: Minchan Kim <minchan@kernel.org>
Date: Wed, 20 Feb 2013 13:14:41 +1100
Subject: [PATCH] mm: Get rid of lockdep whinge on sys_swapon

[1] forgot to initialize spin_lock so lockdep is whingeing
about it. This patch fixes it.

[1] 0f181e0e4, swap: add per-partition lock for swapfile

Signed-off-by: Minchan Kim <minchan@kernel.org>
Reported-by: Valdis Kletnieks <Valdis.Kletnieks@vt.edu>
Tested-by: Valdis Kletnieks <Valdis.Kletnieks@vt.edu>
Cc: Shaohua Li <shli@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 mm/swapfile.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 7df5270fe3c8..9b51266413cd 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1856,6 +1856,7 @@ static struct swap_info_struct *alloc_swap_info(void)
 	p->flags = SWP_USED;
 	p->next = -1;
 	spin_unlock(&swap_lock);
+	spin_lock_init(&p->lock);
 
 	return p;
 }
-- 
2.39.5