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

Cc: Shaohua Li <[email protected]>
Reported/Tested-by: Valdis Kletnieks <[email protected]>

---
 mm/swapfile.c | 1 +
 1 file changed, 1 insertion(+)

index dfaff5f..ac190d6 100644
@@ -1857,6 +1857,7 @@ 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;
 }

1.8.1.1

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